Technical Aspects of Digital Audio

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Technical Aspects of Digital Audio

Digital Audio

Digital Audio Technology

As a music producer, I have always been fascinated by the technical aspects of digital audio. The technology behind digital audio has come a long way since its inception, and it continues to evolve at a rapid pace. One of the most significant advancements in digital audio technology is the use of digital signal processing (DSP) algorithms. These algorithms allow for the manipulation of audio signals in real-time, enabling producers to create complex soundscapes and effects.
In his book, “The Art of Digital Audio,” John Watkinson writes, “DSP algorithms are the key to the power of digital audio. They allow us to do things that were previously impossible with analog audio.” I couldn’t agree more. DSP algorithms have revolutionized the way we produce and consume music, and they continue to push the boundaries of what is possible.

Digital Audio Formats

When it comes to digital audio, there are a variety of formats to choose from. Each format has its own unique characteristics, and choosing the right one can make a significant difference in the quality of your audio. Some of the most popular digital audio formats include MP3, WAV, and FLAC.
Personally, I prefer to work with WAV files. They offer the highest quality audio and are compatible with most digital audio workstations (DAWs). However, they do take up a lot of storage space, so it’s essential to have a reliable backup system in place.

Digital Audio Editing

Digital audio editing is an essential part of the music production process. It allows producers to manipulate audio files in a variety of ways, from simple cuts and fades to complex time-stretching and pitch-shifting. One of the most popular digital audio editing tools is Pro Tools, which is widely used in the music industry.
In my experience, the key to successful digital audio editing is to have a clear vision of what you want to achieve. It’s easy to get lost in the endless possibilities of digital audio editing, so it’s essential to stay focused on your goals. As the famous producer Quincy Jones once said, “The most important thing is to have a vision for your music – one that is unique and true to who you are as an artist.”

Digital Audio Processing

Digital Audio Compression

Digital audio compression is a process that reduces the size of audio files without significantly affecting their quality. Compression is essential for streaming services like Spotify and Apple Music, which need to deliver high-quality audio over the internet. However, compression can also have a negative impact on the quality of the audio, particularly if it’s overdone.
In my opinion, it’s essential to strike a balance between file size and audio quality when compressing digital audio. As the saying goes, “less is more.” It’s better to have a smaller file size with slightly lower audio quality than a massive file size with no noticeable improvement in quality.

Digital Audio Quality

Digital audio quality is a topic that is often debated among music producers and audiophiles. Some argue that digital audio can never match the warmth and depth of analog audio, while others believe that digital audio has surpassed analog in terms of quality.
In my experience, digital audio quality has come a long way in recent years. With high-resolution audio formats like FLAC and MQA, it’s now possible to achieve audio quality that rivals or even surpasses analog. However, it’s essential to have a high-quality playback system to fully appreciate the nuances of digital audio.

Digital Audio Production

Digital audio production is the process of creating music using digital tools and technology. It’s a complex and challenging process that requires a combination of technical skill and artistic vision. One of the most critical aspects of digital audio production is the ability to collaborate effectively with other musicians and producers.
In my experience, the key to successful digital audio production is to stay organized and focused. It’s easy to get lost in the endless possibilities of digital audio, so it’s essential to have a clear plan and timeline for your project. As the famous producer Rick Rubin once said, “The most important thing is to capture the essence of the song and the artist’s performance.”
Final Words:
In conclusion, the technical aspects of digital audio are complex and ever-evolving. From digital audio technology to digital audio production, there are many factors to consider when working with digital audio. However, with the right tools and techniques, it’s possible to achieve high-quality audio that rivals or even surpasses analog. As a music producer, I’m excited to see where the future of digital audio will take us.
digital audio, digital signal processing, audio compression, audio quality, audio editing, audio production, music production, digital audio technology, digital audio formats, high-resolution audio, FLAC, MP3, WAV, Pro Tools, audio playback, audio collaboration, audio mixing, audio mastering, audio plugins, audio effects, audio engineering, audio equipment, audio recording, audio software, audio hardware, audio interfaces, audio cables, audio troubleshooting, audio restoration, audio normalization, audio equalization, audio dynamics, audio synthesis

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What is Digital Audio and How Does it Work?

Digital Audio

Digital audio is a technology that allows us to record, store, and reproduce sound in a digital format. Unlike analog audio, which is recorded and stored as a continuous wave, digital audio is converted into a series of numbers that represent the amplitude of the sound wave at different points in time. These numbers are then stored as digital data, which can be played back using a digital-to-analog converter (DAC).

Digital Audio Technology

One of the key technologies used in digital audio is audio encoding. This is the process of converting analog audio signals into digital data that can be stored and manipulated. There are several different audio encoding formats, including MP3, AAC, and FLAC. Each format has its own advantages and disadvantages, depending on factors such as sound quality, file size, and compatibility with different devices.

Another important technology used in digital audio is audio compression. This is the process of reducing the size of digital audio files by removing redundant or unnecessary data. There are two main types of audio compression: lossy compression and lossless compression. Lossy compression, as the name suggests, involves removing data from the audio file that is deemed to be less important, resulting in a smaller file size but also a loss of some of the original sound quality. Lossless compression, on the other hand, preserves all of the original data but still reduces the file size.

As author David Mellor explains in his book “Digital Audio Explained,” “digital audio technology has made it possible to record and manipulate sound with an unprecedented level of accuracy and precision.” This has led to a range of new applications for audio, including music production, sound design, and audio post-production for film and television.

Digital Audio File Types

There are several different types of digital audio files, each with its own file extension and format. Some of the most common file types include MP3, WAV, AIFF, and FLAC. Each format has its own strengths and weaknesses, depending on factors such as sound quality, file size, and compatibility with different devices.

For example, MP3 is a popular format for music files because it is small in size and can be played on most devices. However, it uses lossy compression, which means that some of the original audio data is lost during the encoding process. WAV, on the other hand, is a lossless format that preserves all of the original audio data, but is larger in size and may not be compatible with all devices.

Advantages of Digital Audio

One of the main advantages of digital audio is that it allows for a high level of precision and control over the sound. This makes it possible to manipulate audio in ways that were not possible with analog audio, such as applying digital effects and processing, editing audio with a high degree of precision, and adjusting the levels of different tracks in a mix.

Digital audio also allows for easy sharing and distribution of audio files, since they can be stored and transferred as digital data. This has led to the development of online music stores, streaming services, and other digital audio platforms that have transformed the way we listen to and consume music.

As author Robert A. Turnbaugh explains in his book “Introduction to Digital Audio,” “digital audio has revolutionized the way we create, produce, and distribute sound.” Whether you are a professional audio engineer or a casual listener, digital audio has opened up new possibilities for how we interact with sound.

Conclusion:

In conclusion, digital audio is a fascinating and complex topic that involves many technical aspects. Understanding the basics of digital audio, such as sampling rate, bit depth, and file formats, can help you get the most out of your digital audio experience. It can also help you troubleshoot any issues you might encounter with your digital audio files.

We hope this article has been informative and helpful in providing a basic understanding of digital audio. Remember, the key to optimizing your digital audio experience is to keep learning and experimenting with different techniques and tools.

As musician and audio engineer Steve Albini once said, “The only way to learn how to make records is to be making records.” So get out there and start exploring the world of digital audio, and don’t be afraid to try new things.

Thank you for reading this article, and we hope you found it helpful. If you have any questions or comments, feel free to leave them below. And remember, if you’re looking for a reliable and effective audio normalization and conversion tool, give MP4Gain a try.

What is Digital Audio?

Digital audio is a method of storing audio data on a computer or digital device. Audio data is essentially a collection of sound waves, and to store it digitally, we need to convert these sound waves into a series of numbers that a computer can understand.

What is Digital Audio?

To do this, we use a process called “analog-to-digital conversion”. Analog audio signals are transformed into digital data by measuring the sound wave at regular intervals and assigning each measurement a numerical value. The process of measuring sound waves is called “sampling”, and the numerical values assigned to each sample are known as “bit depth”.

In essence, the audio signal is converted into a series of binary digits (1s and 0s) that can be stored on a computer. This allows us to manipulate, edit, and reproduce audio data in various ways.

How is Audio Converted to Digital Audio?

As mentioned earlier, audio is converted to digital audio using a process called “sampling”. Sampling involves taking snapshots of the audio signal at regular intervals, known as the “sampling rate”. The more samples that are taken per second, the more accurately the original sound can be reconstructed.

Imagine taking a picture of a person running. If you take one picture per second, you’ll see the person moving, but the motion won’t be smooth. If you take 10 pictures per second, the motion will be smoother, and if you take 60 pictures per second, the motion will be very smooth.

The same principle applies to digital audio. By taking many samples per second, the original sound can be accurately reconstructed. The number of samples taken per second is called the “sampling rate”, and it’s usually measured in Hertz (Hz). For example, a typical sampling rate for CD-quality audio is 44.1kHz, which means that 44,100 samples are taken per second.

Once the audio has been sampled, each sample is converted into a digital number. The number represents the amplitude of the sound wave at that particular moment. The amplitude of a sound wave is the height of the wave, and it determines how loud or quiet the sound is.

The digital numbers obtained from each sample are stored as binary data, which can be easily stored, edited, and reproduced on a computer.

What is an MP3?

An MP3 is a type of digital audio file that uses a technique called “lossy compression”. This means that some of the data in the original audio file is removed in order to reduce the file size. The removed data is typically inaudible to the human ear, so the overall quality of the audio is not significantly affected.

MP3s achieve this compression by using a technique called “perceptual coding”. This involves analyzing the audio signal and identifying the parts that are less important to the overall sound quality. These parts are then removed, leaving only the most important parts of the audio signal intact.

For example, let’s say you have a song that is 4 minutes long and takes up 40MB of storage space on your computer. If you were to convert that song into an MP3 file, the resulting file might only be 4MB in size, while still maintaining a high level of audio quality.

MP3 files are a popular choice for digital audio because they take up less space than other audio formats, making them easier to store and share. They’re also supported by most digital audio players and software, making them a versatile and widely used format.

How are Sound Waves Converted into Digital Numbers?

As we mentioned earlier, sound waves are converted into digital numbers using a process called “analog-to-digital conversion”. This process involves several steps:

Sampling: The analog audio signal is measured at regular intervals, known as the sampling rate. Each sample is a snapshot of the audio signal at that particular moment.

Quantization: Each sample is assigned a numerical value that represents the amplitude of the sound wave at that moment. This is done using a process called quantization, which assigns a specific digital value to each sample.

Encoding: The digital values obtained from quantization are then converted into binary data. This is done using a process called encoding, which converts each digital value into a series of 1s and 0s.

Compression: Depending on the file format being used, the digital audio data may be compressed in order to reduce its file size. Lossy compression, as we discussed earlier, involves removing some of the data from the original audio file to reduce its size, while maintaining a high level of audio quality. Lossless compression, on the other hand, compresses the file size without sacrificing any data or quality.

Once the audio has been converted into digital data, it can be easily manipulated, edited, and reproduced on a computer or digital device. This allows us to do things like change the volume, apply special effects, and even create entirely new compositions using existing audio samples.

In summary, digital audio is a way of storing and manipulating audio data using a series of numbers that a computer can understand. Analog-to-digital conversion is the process of converting sound waves into digital data, which involves sampling, quantization, encoding, and compression. MP3s are a popular type of digital audio file that use lossy compression to reduce file size, while maintaining a high level of audio quality.

There are several types such as WAV, MP3 and FLAC, but what is the difference? Part 4

There are several types such as WAV, MP3 and FLAC, but what is the difference? Part 4

There are several types such as WAV, MP3 and FLAC, but what is the difference? Comprehensive research on music file formats

Data and music
Does the boom from the analog discs come back?

In recent years, the world boom of analog discs has arrived. According to the Association of the Recording Industry of the Public Corporation in General of Japan, the national disk market is the production number of 2017 1063000 sheets. In terms of Amount, it was 1,916 million yen, the highest of the last 10 years.

You may have heard that sound quality is generally better than that of a CD, but what really differs is the recorded frequency band.

It is said that the frequency band that can be stored on a CD is up to about 22,000 Hz, while the analog record contains information of up to about 100,000 Hz. However, it is said that the audible human range is approximately 20Hz to 20,000Hz, so it does not make sense unless you notice the difference in sound. It seems that the parties other than the audible human range, the vibration of the air due to the sound and the force caused by it, are transmitted by other routes other than sound.

This is a great merit that can only be experienced with analog discs, and it can be said that it is the true emotion of the discs.

However, the care of the equipment, the deterioration of the plate, the difficulty of handling and the size can be disadvantages compared to the CDs and the data. (In the youngest generation of these days, this effort is quite new and many people enjoy it).

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There are several formats for musical data files and each one has its own personality. Which of the music services and distribution sites that I have used casually so far?

It can also be good to listen and compare the differences with data such as CD and analog discs.

I want to take me well with musical data wisely according to my style!

There are several types such as WAV, MP3 and FLAC, but what is the difference? Part 3

There are several types such as WAV, MP3 and FLAC, but what is the difference? Part 3

Relationship between the depth of bits, the sampling frequency and the frequency of bits

The musical data has numbers such as the depth of bits and the sampling frequency indicating the amount of musical data per second.

And the product of the two is the “bit rate”.

· Sampling rate
Also known as sampling frequency. It shows how many tens of thousands of sounds are collected per second.

The higher the value, the greater the number of divisions, which translates into a softer sound and an improved sound quality.

By the way, the CD is 44100Hz.

· Bit depth
Also known as quantification bits, bid reduction, sample bits count.

This shows how much capacity is given to divided data.

The greater the sound, the better the sound will be and the quality of the sound will be improved.

The CD is 16 bits.

· Bit rate
It is shown as BPS and shows the amount of data per second.

It is the product of the “sampling frequency” and the “bits depth” mentioned above.

In the case of a stereo file, there are two sounds, so if you formulate it …

Sampling rate (Hz) x Bit depth (bits) x 2 = Bit rate (BPS)
A large “bit rate” means a “sampling rate” and a large large bits depth, which means that sound quality is good.

By the way, in the case of CD,

44100 (Hz) x 16 (bits) x 2 = 1411200 (BPS)
This means that.

In this article, I specifically compared the difference in the file size.

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There are several types such as WAV, MP3 and FLAC, but what is the difference? Comprehensive research on music file formats
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Data and music
INDEX

I compared file sizes
So, what is the call frequency?
Is “dead mp3”?
Why are there so many formats in the first place?
I compared file sizes
Then, I compared what kind of difference is made from the point of view of the file size and if there is a difference in Hz that sounds depending on each file format. In comparison, Tucson Repertory Orchestra and Sierra Vista Symphony Orchestra were listening to the opinion of Japanese Director Toru Tagawa, who serves as musical director and director of the (Sierra Vista Symphony Orchestra), is the ninth of Beethoven is good advised me to play The Berlin Philharmonic directed by Karajan, one of the most famous recordings.

I compared file sizes

So, what is the call frequency?
Is “dead mp3”?
Why are there so many formats in the first place?
I compared file sizes
Then, I compared what kind of difference is made from the point of view of the file size and if there is a difference in Hz that sounds depending on each file format. In comparison, Tucson Repertory Orchestra and Sierra Vista Symphony Orchestra were listening to the opinion of Japanese Director Toru Tagawa, who serves as musical director and director of the (Sierra Vista Symphony Orchestra), is the ninth of Beethoven is good advised me to play The Berlin Philharmonic directed by Karajan, one of the most famous recordings.

Then, here is the CD used for this comparison.

Symphony n. ° 9 by Beethoven (choir) from director Herbert von Karajan released by Universal Music. In fact, it is said that the Ninth of Beethoven was the origin of the unit of a CD. (There are several theories about this).

When I really verified it, there was still a remarkable difference in the size of the file.

OLA 701.5 MB.
ALAC 308.6 MB.
MP3.
160 kbps 79.4 MB
256 Kbps 127 MB
320 kbps 158.8 MB
CAA.
160 kbps 80.2 MB
256 Kbps 127.8 MB
320 kbps 159.5 MB
However, for “MP3” and “AAC”, none of the bit rates appeared around 1 MB.

So, what is the call frequency?

With respect to the frequency, I tried to verify showing the waveform. The image above is in WAV format.

Compared to “WAV”, there were almost no changes in the frequency of acute and only a slight change in the bass was observed.

Comparing “MP3” and “AAC”, which have almost the same file size, you can see that “AAC” has a lower tone. In terms of frequency, “AAC” seems to have a better sound quality. In other words, the result of the verification shows that AAC, which is a more recent compression technology, is higher.

There are several types such as WAV, MP3 and FLAC, but what is the difference?

There are several types such as WAV, MP3 and FLAC, but what is the difference?

Comprehensive research on file formats
Do they like music to all?

I think many people enjoy music by downloading or playing streaming instead of CD these days, but what kind of format music is stored as data?

I researched the differences, advantages and disadvantages of each format.

Types of audio compression

There are three types of music file formats: “Not compressed”, “compressed with loss” and “compressed without loss”.

File-based compression can reduce the size of the file and reduce the download time and storage capacity.

“Uncompressed format”
As its name indicates it, it is an uncompressed file. The point are the original data.

The advantage is the accuracy of the data. However, it also has the disadvantage of a large file, which uses about 10 MB for a 1-minute audio file.

The most used are “WAV” and “AIFF”. It is common to use “WAV” for Windows and “AIFF” for Macintosh.

“Compression format with loss”
This compression format is probably the one that most uses.

Although there are individual differences, it is said that the human audible range is 20 Hz to 20000 Hz. This file format has the advantage that the file size can be deleted while maintaining a certain level of sound quality when it is removed and compressed Other parts difficult to identify.

Even so, the disadvantage is that the sound quality is lower than the original data. It is not exaggerated to say that “MP3” is the best-known file format. As successors, “AAC” is often used, which was created to achieve higher sound quality. In addition, “WMA”, “Vorbis”, etc. They are also in this format.

“Format of compression without loss”
This format compresses the original data while preserves them.

During playback, you can decompress and return to the original uncompressed format, so the sound quality is the same as that of the original data. Although the file size can be reduced compared to the uncompressed format, it is still about half, so the size of the file is greater than that of the compressed format with loss and takes more time coding and decoding.

In addition, it is currently not handled by the main music distribution sites, and the number of devices that can be reproduced is less than that of uncompressed formats. The most common of these formats is “FLAC”, and Apple uses a single format called “ALAC”.

What is the difference between MP3 and AAC? Part 3

What is the difference between MP3 and AAC? Part 3

Finally, let’s review the important MP3 and AAC compatible devices.

MP3s are compatible with almost all music-playing devices, such as personal computers, smartphones, and audio devices. Therefore, it is generally better to save the file in MP3 format.

As for AAC, it is a recommended storage format for iPad / iPhone users and those who use iTunes, Apple’s official music player, because it is compatible with Apple devices. Even if you import the sound source from a CD with iTunes or purchase paid music content from iTunes, it will be saved in AAC format.

Which is better, MP3 or AAC?

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In this article, I explained about MP3 and AAC music file storage formats. Finally, if you do not know what is the storage format that I should use, to leave and save the music files in MP3 format, it can be said that it is the best. MP3s have many playable devices and the sound quality is not that different from AAC.

Also, files saved in MP3 format can be easily converted to AAC files using iTunesw. When saving as MP3, it can also support post file conversion, so if you have problems with the save format, it is better to select the MP3 format. Also, if you’re targeting Apple devices, try saving music by choosing an AAC format that doesn’t need to be converted.

What is the difference between MP3 and AAC? Part 2

What is the difference between MP3 and AAC? Part 2

The disadvantage of the “lossy compression format” used by MP3 / AAC is that the compressed data file cannot be restored to its original size (the original sound quality of music content).

There is a music content compression format called “lossless compression format”, which has a relatively large data size and can restore the original sound quality when playing music files.

There is not much difference between the two compression formats, but if you want better sound quality, you should use the “lossless compression format”. In the next chapter, we will further compare the differences between MP3 and AAC formats.

Comparison of MP3 and AAC

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We will compare MP3 and AAC in terms of sound quality and compression rate (bit rate).

Sound quality

As mentioned above, MP3 and AAC are compression methods that use the “lossy compression format”, so there is not a big difference in sound quality between the two formats. The sound quality of MP3 and AAC differs depending on the compression rate (bit rate) of the music content file. So what exactly is the compression rate (bitrate)? The next section describes (compression bit rate).

Compression rate (bit rate)

format Compression rate (bit rate)
64kbbp 96kbbp 128 kbbp 160 kbp 192 kbbp 256 kbbp 320kbbp

MP3 Upper Limit Frequency 8.3 kHz 11.7 kHz 15.2 kHz 18.6 kHz 21.3 kHz 22.0 kHz 22.0 kHz

MP3 size 123kB 184kB 245kB 308kB 372kB 494kB 616kB

AAC upper limit frequency 13.5 kHz 15.2 kHz 18.7 kHz 19.1 kHz 19.6 kHz 20.0 kHz 20.0 kHz

AAC size 127kB 188kB 249 KB 310kB 368kB 490kB 613kB

The comparison table above shows the compression rate (bit rate) of MP3 and AAC, and the upper limit of frequency and data size (capacity). The higher the value of the compression rate (bit rate), the higher the upper limit for frequency and data size (capacity), and the better the sound quality.

Although the compression rate (bit rate) of MP3 and AAC is the same, the data size (capacity) and the upper limit frequency are different, so please compare the sound quality using the table above as a guide.

Proper use of MP3 and AAC

In this chapter at the end of this article, we will introduce how to use MP3 and AAC correctly. Even if you read the comparative explanation of MP3 and AAC presented so far, many people may not get it right. How to use MP3 and AAC correctly should be judged by the compression rate (bit rate).

Bit rate

As discussed in the previous chapter, the higher the value expressed in “kbbs” called the compression rate (bit rate), the better the sound quality. However, MP3 and AAC have the same compression rate (bit rate) but different upper limit frequencies.

128 kbps to 160 kbps is adopted for general MP3 / AAC music files. This is because you can watch various music genres like J-POP and Jazz with high sound quality. You can fully enjoy music with your PC speakers and audio equipment.

Then I will explain the characteristics of the compression rate (bit rate) of 128 kbps or less and the compression rate (bit rate) of 160 kbps or more, and which file format should be used, MP3 or AAC.

Less than 128 kbps

A compression rate (bit rate) of less than 128 kbps does not improve the sound quality of music, etc., and is not suitable for the music content storage file format. Suitable as a conversation-focused radio sound source. Also, if it is less than 128 kbps, the AAC format has a higher frequency upper limit, so the sound quality is said to be better than MP3.

192 kbps or higher

The compression rate (bit rate) of 192 kbps or higher reproduces even delicate sounds like classical music. If you have a good ear, you can clearly tell the difference in sound quality.

When the compression rate (bit rate) is 192 kbps or higher, the MP3 format has a higher upper limit frequency and is said to have a higher sound quality. The data size (capacity) is almost the same as that of AAC, so it is recommended to save it in MP3 format.

What is the difference between MP3 and AAC?

What is the difference between MP3 and AAC?

It also explains the benefits of compressing file size and sound quality!

This article introduces the compressed music file storage formats called MP3 and AAC. If you don’t know which compression storage format to choose, MP3 or AAC, check the characteristics and merits of each MP3 and AAC presented in this article and select the most suitable storage format.

What MP3 and AAC have in common
・ The MP3 / AAC compression format is “lossy compression format”
3Comparison of MP3 and AAC
·Sound quality
・ Compression rate (bit rate)
Four Proper use of MP3 and AAC
·Bit rate
・ Compatible equipment
Five Which is better, MP3 or AAC?

Difference between MP3 and AAC

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In this chapter at the beginning of this article, we will explain the characteristics and differences between the MP3 file format and the AAC file format. Many people generally recognize that both MP3 and AAC are file compression formats dedicated to music and audio, but not many people clearly understand the difference between MP3 and AAC.

A solid understanding of the differences between MP3 and AAC will help you choose the correct file format, so it is important to remember each file format first.

MP3

MP3 is the oldest music file storage format for smartphones and computers. MP3 is a format that compresses music files and is characterized by a large number of compatible devices. MP3 is a music compression format, but there is a video compression format called MP4.

The names of both formats are similar, but watch out for mistakes as they are completely different formats. MP4 is also a well-known video compression storage format, so it’s a good idea to keep that in mind.

AAC

AAC is also known as alias “M4A”, “M4P”, which was established as the music compression format for the upcoming MP3, the standard compression format for Apple products such as the iPhone and iPad. When you purchase paid music content from iTunes, all purchased music files are saved as “AAC” files in iTunes.

Files saved in AAC format apply to copyrighted music content.

What MP3 and AAC have in common

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I will present the common points between MP3 and AAC. Both are compression methods for digital music content, but I will introduce the compression format and the advantages of compression.

The MP3 / AAC compression format is “lossy compression format”

The MP3 / AAC music content compression format is called “lossy compression format” and they both have the same compression format. Digital music data is usually a 1 minute music / audio file with a large size (capacity) of 10 MB, but since it is compressed with the MP3 / AAC “lossy compression format”, the download speed is fast and the storage capacity is increased. It does not squeeze.

Data file compression (capacity) of music content makes sound quality worse than live audio, but falls within the range of sound quality that can be heard by the human ear, so there is no problems such as interruptions in sound.

Is AAC absolutely better than mp3?

Is AAC absolutely better than mp3?

I know that the lossless sound source is of the highest quality, but the file size is too large.

I want to hear it in the smallest possible size with the best possible sound quality!

I think there are many such people. I am the same.

This time, I would like to roughly examine the differences between mp3 and AAC.
I don’t know because it’s just a little bit snooty for a hobbyist.

Effect
Since this is a compressed sound source, casual listening is an important premise.

First, let’s abandon the stereotype that “AAC is better.”

Looking at the net, there are people who write that “AAC is better because it came out later” or “AAC is better because it is an improved version of mp3”, but the compression efficiency is good and the sound that you can really hear in particular, not I think it is always the same to improve.

This study then only confirms the “objectively understandable difference” for each format, and does not determine the superiority or inferiority of sound quality.

Personally, assuming 320 kbps, even if it is a compressed sound source, be it mp3 or AAC, the audible range is perfectly suppressed, so I think the sound you hear is the same, and I only listen casually. I don’t even have to hear the slightest difference.

Honestly, 128 kbps is fine for portable use (although the audible range changes significantly compared to 320 kbps), but if you’re looking for a premium music experience with home audio, you should use a compressed sound source first. use time.

Frequency analysis
There are many other people who do the same, but I’ll check it out myself.
Note that the vertical and horizontal widths differ for each graphic.
All encoding to mp3 / AAC is done with iTunes.

First, I prepared a FLAC sound source sample. The genre is rock.
The characteristics of 4608 kbps bit rate / 96 kHz sampling rate / 24 bit bit depth of
frequency are as follows. This is the original way.

Generally, the human audible range is said to be around 20Hz to 20kHz *, but with FLAC, you can see that information is also included in the ultra-high range above 20kHz.

* Actually, it seems that most people have a hard time distinguishing between 15 kHz and higher.

Then AAC / 320 kbps
* Sampling frequency 44.1 kHz / Bit depth 16 bit

There is information above 20 kHz, and it seems that the sound around 22 kHz is cut off by gradually attenuating. Looking only at the frequency, there is not a big change from FLAC. Is the sound pressure so low that you can’t feel it? That is all.

Then mp3 / 320 kbps
* Sampling frequency 44.1 kHz / bit depth 16 bit

It is characteristic that it cuts from around 20 kHz.

When mp3 and AAC waveforms overlap, it becomes as follows.
Purple is mp3 and pink is AAC.

There is a considerable difference in the amount of information above 18 kHz. Also, you can see that the other parts are exactly the same (there is a difference in the level of points when zoomed in, but it is considered a negligible difference).

Let’s listen and compare
It is out of the question to mention the difference in sound quality, but there is a huge difference when you look at the waveform above, so experience how it feels when you listen to it.

320kbps mp3 and 320kbps AAC were carefully compared to listen to over and over again.

As a result … well …

I did not understand anything.

There were some parts that said, “Oh … I feel something different …”, but when I did a blind test with the hidden extension, I had no confidence at all, so I decided to be a placebo.

When you play the same song randomly while walking down the street, you are unlikely to know “Oh, this is the mp3!” Or “This sharp glow … AAC!” . In my ears.

conclusion
You can convert it as you like (appropriate).

It seems certain that AAC has better compression technology, but I think it is almost impossible to distinguish the quality of the sound that is actually heard in a casual environment.

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