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When did mp3 music files first appear?

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When did mp3 music files first appear?

MPEG-1 Audio Layer 3, often referred to as MP3, is one of the most popular lossy compression and digital audio encoding formats today.

There is no noticeable drop in sound quality compared to the original uncompressed audio. It was invented and standardized in 1991 by a group of engineers at the Fraunhofer-Gesellschaft research organization in Erlangen, Germany.
MPEG-1 Audio Layer 3, often referred to as MP3, is one of the most popular lossy compression and digital audio encoding formats today. There is no noticeable drop in sound quality compared to the original uncompressed audio. It was invented and standardized in 1991 by a group of engineers at the Fraunhofer-Gesellschaft research organization in Erlangen, Germany.

The audio format supported by the MP3 player is not only MP3 format, but also WMA, WAV, MP3Pro, ASF, AAC and VQF, etc. The WMA format can reach CD quality when compressed to 64 kbps, and output is only half the size of the corresponding MP3 file. This is very important for models with only 32 MB of flash memory. WMA and RA formats are supported, which means FlashMemory space is almost doubled. If it’s hard, be sure to ask this question when purchasing.
Among all the music formats supported by MP3, the most common ones are MP3, WMA and WAV. Others are unpopular or too bulky to be practical.

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What is MP3?

What is MP3?

MP3

“MP3” widely used in audio players. The official name is “MPEG-1 Audio Layer III”, which is the audio format for MPEG-1. The MP3 format itself is being standardized in parallel with MPEG as the video format, and in 1992 it will be standardized as “ISO / IEC IS 11172-3 (MPEG-1 Audio)”.

After that, MP3s will be distributed “as is” among enthusiasts, but this has not been a major advance since the introduction of the portable “mpman” audio player launched by SAEHAN International in South Korea in 1998. By combining this player, which can download and play music data over the Internet, with Napster, which appeared in 1999, the scene of portable audio players that used to carry cassettes, CDs, MDs, etc. it will change completely.

MP3s can also reduce the original data to less than one tenth. For example, it has become possible to compress a one-hour music CD to about 40MB and, using Napster, etc., we have established a new need for music sharing between users. After that, despite various “RIAA (Recording Industry Association of America)” procedures and the emergence of successor formats formulated by many manufacturers, MP3s remain a widely used audio. It is still used as a format.

■ MPEG

To understand the working principle of MP3, let’s first explain about “MPEG Audio” itself. A feature of MPEG Audio is that it uses auditory psychology, the lower audible limit of hearing, and the masking effect.

Let’s start with this minimum audible limit. In general, it is considered that humans can hear sounds in the range of 20 Hz to 20 kHz. Of course, this is an average value, and some people can hear a wider range, while others can only hear a narrower range, but this time I’ll drop it.

So if you can hear any sound in the 20Hz to 20KHz range, that’s not the case. The lower audible limit curve is shown in Fig. 1, and it is possible to hear even a fairly low sound around 2KHz, but at frequencies above or below it, it is heard that it is not considerably loud. .

You may have heard the term “volume curve”, which is the curve shown in Figure 1. Therefore, even if there is a sound source that sounds in a wide range from bass to treble (Fig. 2 ), the human ear has the characteristic that it can only be heard with both ends drooping (Fig. 3). By taking advantage of this and omitting all inaudible frequency data, a great deal of compression is made possible.

Masking effect

The masking effect is another phenomenon. For example, when a very loud sound is generated at a certain frequency, a specific area called “Critical Band” is created before and after that. And you won’t hear any of the other sounds included in this critical band.

When sound A is generated, the sloping area that extends to the before and after frequencies is the Critical Band. I can hear the part of the B sound that sticks out of the Critical Band without any problem, but I can’t hear the C sound that completely fits into the Critical Band.

In MPEG Audio, compression efficiency is further improved by omitting sound data that cannot be heard due to this critical band as before. By the way, the masking effect itself is effective not only in the direction of frequency but also in the direction of the time axis. In other words, not only immediately after a loud sound is generated, but also just before that, you cannot hear a small sound for some reason. This is called the temporary masking effect, but in Figure 5, sound B and sound C become inaudible. This is also effective for data compression.

Mp3, the star format, the reasons

Mp3, the star format, the reasons

MP3

Another interesting property of hearing is that the lower the volume level, the lower its resolution, the lower the number of sounds perceived. When the volume is lowered the high frequencies are better perceived, when the volume is increased the low frequencies are perceived. And they do not complement each other, but rather replace each other.

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A person does not perceive some sounds, focusing on others. Pay attention: an instrument, or a voice, is usually audible clearly and consciously. Everything else becomes a background or a single tune. And no matter what we focus on in composition, we cannot increase the number of basic sounds perceived.

How to create the mp3

All these data obtained from experimental studies are gathered and presented in the form of an ideal model of human hearing. The MP3 standard focuses on this.

Everything that a person does not hear unambiguously is immediately cut off. Post-processing degrades the sound according to the understanding of this model.

Thanks to the great work done, modern psychoacoustic models accurately evaluate human hearing and do not stand still.

In fact, despite the assurances of music lovers, musicians and audiophiles, to the inexperienced middle ear, the highest quality MP3 has almost extreme parameters.

There are exceptions, they cannot cease to exist. But they are not always easily noticed by blind listening. And they are no longer derived from the mechanisms of hearing, but from the algorithms for processing sound information in the brain.

And here only personal factors play a role. All of this explains why we love different headphone models and why the numerical characteristics of the audio cannot unequivocally determine the sound quality.

MP3 fits everything: analog quality

Audiophiles’ insistence on picky FLACs is worth going through another serious sift. Most analog recordings do not contain enough information for lossless formats.

All CDs are recorded at 44.1 kHz sample rate and 16-bit quantization. Where does 192 kHz and 24/32 bit come from, which is used when encoding in FLAC? They are not, this is a doll!

You will object that these parameters are higher for analog sound … But for an audio cassette and a magnetic tape (unless, of course, it is a Japanese master tape), the characteristics of an audio CD are NOT ACCEPTABLE. For conventional studio equipment, the ability to record analog sound corresponding to AudioCD is relatively new.

Therefore, it makes no sense to digitize recordings from the pre-digital era in frenetic quality, especially those made on magnetic media. They do not contain those spectra and the amount of information that containers can store without compression.

Everything fits in MP3: digital

Strictly speaking, with most digital recordings, the image is the same. In the 90s and later, cheap plastic boomboxes appeared. The sound engineers had to take care of the uniform sound on all devices: the dynamic range of the recordings was reduced to 10-12 bits.

One more point. Until recently, no one recorded in a very high-quality studio. Because it is difficult to work simultaneously with several dozen audio tracks with high recording quality, and sometimes there are simply not enough human and technical resources.

Why mp3 is enough for you, but Lossless is not necessary

Why mp3 is enough for you, but Lossless is not necessary

Mp3

Did you finish the greenhouse? So you don’t need to lose, listen to high quality mp3.

Very often there are people who, in principle, despise compressed formats. You should not be guided by your opinion. The following mods that in the studio with a 90% probability will not hear the difference between compressed and uncompressed audio.

What is mp3

MP3 isn’t just about cutting quality. It was developed by the Fraunchhofer Society, an association of applied research institutes in Germany. Later they came up with AAC, which could become the main compressed audio format … But it didn’t work.

Did you know that MP3 comes with variable (VBR) and constant (CBR) bit rate? The constant bit rate, due to the operation of the algorithm, is encoded each time as the first. Therefore, it can produce uneven quality, which means that not all sounds in this situation will be recorded in high quality.

Since MP3 has been around for a long time, it has many limitations. Bit width is 16-24 bits. The sample rate is represented by the following set of options: 8; 11,025; 12; sixteen; 22.05; 24; 32; 44.1; 48. The maximum bit rate does not exceed 320 kbps. The maximum number of channels is 2. But we are still talking about music, we still have to search for multi-channel recordings.
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Now let’s see how MP3 is encoded. The illustration shows the time-frequency distribution of sound. Same recording: Audio CD, OGG file, MP3 well encoded. What we observe is that the pieces on the right and left almost completely coincide. This means that the MP3 file sounds almost the same as the original CD recording.

Human hearing and its limits – psychoacoustics

The fact is that the main task of the Fraunchhofer Society is the development of psychoacoustic models of human perception of sound. And here are many subtleties. The main thing is that we are not dolphins.

Second, there are certain restrictions on the number of sounds perceived simultaneously. A person cannot simultaneously hear more than 250 sounds of 24 ranges (in addition, the number of simultaneous sounds in the range is also quite small).

Third, the audible range is 16 Hz to 20 kHz and at the age of 60 it is reduced by almost half. Ideally, and during training (yes, you have to train it!).

All frequencies below 100 Hz are perceived not by the hearing cells, but … by the skin. Then the low waves are reflected in the ear canal; these waves are perceived as infrabass. (This is from the bone conduction area).
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Also, the number of cells that register acoustic waves is different for each one. But what is there? For each individual, their number in the right and left ear is different.

By the way, the perception of each ear is different. Change channels of your favorite song – get a new sound.

If you dig deeper, it turns out that each sound frequency is perceived only at a certain volume. When it is reached, the silence is replaced by a sharp and quite different sound. After that, a person can hear a lower sound of this frequency.

MP3 digital audio format

MP3 digital audio format

MP3 File Format

High-quality digitized audio requires a large amount of disk space.

mp3 file

Attempts to reduce the size of files using standard archivers (RAR, GZIP, etc.) do not generate significant gains due to the specificity of the sound data. However, it is possible to achieve a fairly significant level of compression of the audio information using special methods based on the analysis of the data structure and subsequent compression with some loss.

The real possibility of sound processing comparable in quality to existing analog examples did not appear until the late 1980s.

In 1988, the International Organization for Standardization (ISO) formed the MPEG (Moving Picture Experts Group) committee, whose main task is to develop standards for the encoding of moving pictures, sound and their combination. During the ten years of its existence, the committee has developed a series of norms on this subject. As a result, summarizing the extensive research in this area, several specific formats were recommended for storing data, which are excellent in quality of results and data flow.

There are currently three video storage standards: MPEG-1, MPEG-2, and MPEG-4.

Within the first two formats, there are also formats for storing audio information: Layer-1, Layer-2 and Layer-3. These three audio formats are defined for MPEG-1 and minor extensions are used in MPEG-2. The three formats are similar to each other, but use different levels of trade-off between compression and complexity.

Layer-1 is the simplest, it does not require significant compression costs, but it also provides a negligible compression ratio.

Layer-3 is the most time consuming and provides the best compression. Recently, this format has gained immense popularity. It is often called MP3. This name is associated with the extension of the audio files stored in this format.

The underlying idea behind all lossy audio compression techniques is to neglect the subtle details of the original sound that are beyond the reach of the human ear. Here several points can be highlighted.

Noise level . Sound compression is based on a simple fact: if a person is near a loud siren, they are unlikely to hear the conversation of the people who are nearby. And this happens not because a person pays close attention to a loud sound, but to a greater extent because the human ear actually misses out sounds that are in the same frequency range as a louder sound. This effect is called masking, it changes with the difference in volume and frequency of the sound.

The second point is the division of the audio frequency band into subbands, each of which is further processed separately. The encoding program extracts the loudest sounds in each band and uses this information to determine an acceptable noise level for that band. The best encoding programs also take into account the influence of adjacent bands. A very loud sound in one band can affect the masking effect and nearby bands.

Another point of the codification is the use of a psychoacoustic model based on the peculiarities of the human perception of sound. The compression used by this model is based on removing frequencies known to be inaudible, while more carefully preserving sounds that can be easily heard by the human ear. Unfortunately, there can be no exact mathematical formulas here.

The human perception of sound is a complex process, not fully understood, so the choice of compression methods is based on analyzing listening and comparing compressed sounds differently by teams of experts. But here there are practically limitless possibilities in the field of improving psychoacoustic models. Most of the existing algorithms to encode the human voice are based on the high predictability of said signal; Universal MPEG compression algorithms have tried to apply this technique with variable success.

Another compression technique is the use of so-called joint stereo. It is known that the human hearing aid can only determine the direction of the mid frequencies, the high and low sound, so to speak, separately from the source. This means that these background frequencies can be encoded into a mono signal. In addition to all this, compression uses the difference in the complexity of the flows in the channels.

Why mp3 is enough for you, but Lossless is not necessary

Why mp3 is enough for you, but Lossless is not necessary

mp3

Why mp3 is enough for you, but Lossless is not necessary
Did you finish the greenhouse? So you don’t need to lose, listen to high quality mp3.

MP3 wasn’t invented just to reduce quality. It was developed by the Fraunchhofer Society, an association of applied research institutes in Germany. Later they came up with AAC, which could become the main compressed audio format … But it didn’t work.

Now let’s see how MP3 is encoded. The illustration shows the time-frequency distribution of sound. Same recording: Audio CD, OGG file, MP3 well encoded. What we observe is that the pieces on the right and left almost completely coincide. This means that the MP3 file sounds almost the same as the original CD recording.

Human hearing and its limits – psychoacoustics

Third, the audible range is 16 Hz to 20 kHz and at the age of 60 it is reduced by almost half. Ideally, and during training (yes, you have to train it!).

All frequencies below 100 Hz are perceived not by the hearing cells, but … by the skin. Then the low waves are reflected in the ear canal; these waves are perceived as infrabass. (This is from the bone conduction area).
mp3_7_resize
Also, the number of cells that register acoustic waves is different for each one. But what is there? For each individual, their number in the right and left ear is different.

By the way, the perception of each ear is different. Change channels of your favorite song – get a new sound.

Digital audio formats: the MP3 phenomenon

Digital audio formats: the MP3 phenomenon

MP3 format

The MP3 music format (MPEG-1 Layer 3) is one of the most widely used digital audio formats in the world.

MP3 format MP3 format : An Overview

It is compatible with all portable and stationary audio devices. In May 2017, the developers of the format announced his “death”. On April 23, 2017, the Technicolor and Fraunhofer IIS licensed commercial program was canceled: the last patent included in the program expired, making the format standard in the public domain.
Can we say that the days of the most popular format are numbered? MP3 development began in the late 1980s at the Fraunhofer Institute for Integrated Circuits (IIS). In 1987, the University of Erlangen-Nuremberg and Fraunhofer IIS teamed up to work on the EU147 EUREKA Digital Audio Broadcasting (DAB) project. The first result of the alliance’s work was the LC-ATC codec, which made it possible to encode stereo music in real time.

The next step was the development of an optimal frequency domain (OCF) coding algorithm, which already had some of the characteristics of the future MP3 codec. For the first time, it is possible to encode music in good quality at 64 kbps for a mono signal. OCF was the beginning of the path towards standardization MPEG (Moving Picture Expert): an organization, responsible for the development and implementation of international standards for the compression and transmission of digital video and audio content.

In 1989, MPEG received 14 proposals for the implementation of an audio coding standard, so participants were invited to combine their developments. This led to the emergence of four potential candidates, including MUSICAM from the Institute for Broadcasting Technology IRT and Philips and ASPEC (Adaptive Spectral Perceptual Entropy Coding), which is the result of further enhancements to the OCF Fraunhofer IIS in addition to contributions from the University of Hannover in collaboration with AT&T and Thomson.

After extensive testing, MPEG proposed combining MUSICAM and ASPEC to create a family of three encoding methods: Level 1: a low-complexity version of MUSICAM; level 2 – MUSICAM codec; Level 3 (later called MP3): based on ASPEC. Technical development of the MPEG-1 standard was completed in December 1991. In 1994, Fraunhofer IIS introduced the world’s first MP3 encoder, the L3enc, and in 1995 the Fraunhofer researchers unanimously accepted “.mp3” as the file extension for MPEG Layer 3 [1].

Thanks to the compression algorithm used in the MP3 audio format, the size of the data required to reproduce the recording and ensure the quality of sound reproduction is significantly reduced to 10-12 times the original, depending on the recording bit rate. . Bit rate refers to the encoding / decoding rate of a digital audio stream; sound quality improves with increasing bit rate. The MP3 format has the following bit rates: 32 kbps (very low quality, acceptable only for voice), 96 kbps, 128 kbps (medium quality), 160 kbps, 192 kbps, 256 kbps, 320 kbps (maximum optimal quality). The principle of the compression algorithm is as follows: during the compression process, the audio codecs analyze the signals, focusing on the audible fragments, which are saved for later playback or transmission.

This rules out sounds beyond the perception range of the human ear (20 to 20,000 Hz). That is why MP3 is called lossy. There are three ways to encode MP3 files: constant bit rate (CBR), variable bit rate (VBR), and medium bit rate (ABR). CBR is the default encryption mode. In this mode, the bit rate is constant for the entire file. This means that each part of the MP3 file uses the same number of bits. Regardless of the complexity of a piece of music, the encoder uses the same bit rate, so the quality of the final file is variable.

Complex parts will be of lower quality than simpler ones. The main advantage of this mode is that the size of the final files does not change and can be accurately predicted. When encoding in VBR mode, the user selects the desired quality on a scale of 9 (lowest quality, highest distortion) to 0 (highest quality / lowest distortion). The codec then tries to maintain a certain quality throughout the file by choosing the optimal number of bits for each part of the audio recording. The main advantage is the ability to specify the level of quality to be achieved, but the significant disadvantage is the unpredictability of the final file size.

What is an MP3 file?

We start with one of the most common files in the world of computing, that is, the one with the name MP3.

MP3 files have been around for years and that is why their development is so widespread.

But what does an MP3 file represent in practice?

Well, an audio file in general is a sequence of numbers obtained by sampling the analog signal.

MP3

This sampling then responds to some parameters that are the frequency, measured in Khz and the resolution that is instead expressed in Bit.

The MP3 file is the most compressed form of an audio file, so to speak.

At the end of the day, you have to understand that the MP3 file manages to eliminate all the superfluous parts of the digital file of the sequence and the final sampling, exploiting some imperfections of the human body to be able to give you a clear and clean melody.

However, on the other hand, the MP3 file considerably reduces the quality of the reproduced sounds.

In fact, all the different nuances of a given melody boil down to the bone.

An MP3 is small in size from the point of view of memory, it must be seen as a kind of concentrate that gives you an appreciable final result but not one hundred percent complete.

In the most extreme cases, an MP3 file can reduce the original sounds and nuances of the music or melody by up to 90%.

However, these formats are highly appreciated and used because in addition to being practical and straightforward, they are now compatible with any technological device.

This means that you can always carry them with you and any product you have will be able to read an MP3 file.

Mp3 format

MP3 (in full version Moving Picture Expert Group-1/2 Audio Layer 3) is a lossy audio compression algorithm, developed by the MPEG group, capable of drastically reducing the amount of data needed to store a sound, while still be a reproduction. acceptably faithful to the original uncompressed file.

Mp3 Format

Data compression is carried out by eliminating all those sounds that are not perceived by the human auditory system. In fact, recordings in wav format contain much more information than our ear is capable of distinguishing: by removing too much information, it is possible to obtain size reductions of more than 10 times (compared to uncompressed wav format).

In practice, the mp3 format exploits the limits of our auditory system, limits that depend so much on the structure of our ear (not capable of perceiving frequencies above 20 kHz, but particularly sensitive to the intermediate range that goes from 700 Hz to around 6000 Hz) and the ways our brain perceives and interprets sounds. These perceptual limits are studied by psychoacoustics, a sector of psychology that deals with the perception of sounds.

A particularly important and exploited effect in mp3 compression is masking (masking), in which the perception (or less) of a sound is influenced by the presence of another sound. For example, conversation at a bus stop can become completely impossible if a noisy bus approaches: a weaker sound is “masked”, that is, made inaudible by the presence of a louder sound. Masking is all the more effective the closer the two sounds are to frequencies, since our auditory system is unable to discriminate sounds with very close frequencies.

As we have mentioned, mp3 compression is lossy type, that is, it causes irrecoverable data loss and consequently quality degradation. Mp3 encoding allows you to choose how much compression the compression should have, keeping in mind that higher compressions will always correspond to lower sound quality. The quality of mp3 compression is adjusted by a parameter called bitrate that specifies how many kbits the mp3 file should use for each second of recorded audio. There is also the possibility to vary the bit rate within a single mp3 file, using higher bit rates for some parts and lower bit rates for others (for example you can use a lower bit rate for the silent parts or that contain few instruments and use a higher bit rate for more complex parts).

The usable bit rate values are many (from 8 to 320 kbit / s) but 128 kbit / s is considered a good compromise between compression and quality. Knowing the bit rate, it is easy to calculate the size of an mp3 file, since it is enough to multiply this value by the duration of the recording.

Advantages and disadvantages of MP3 technology.

In the internet age, MP3 has become a de facto standard for digital audio files. Napster’s popular peer-to-peer application allowed music lovers to exchange MP3 files so they could get songs without paying for it. This article is written to guarantee the pros and cons of MP3, to help you decide whether to convert your existing music files to MP3 in a different format or not.

mp3 advantages

Advantages of MP3

The advantage of MP3 is the high quality. The quality of an MP3 file is determined by the bit rate. Flow is measured in kilobits per second. The bit rate of an MP3 file can range from 8 kbps to 320 kbps. You should keep your songs at 160 kbps if you don’t really like them and don’t put them at the top of your list of mp3 players. Keep your songs at 192 kbps if you like them a bit. Use 256 kbps for the songs you like. And use 320 kbps for your all-time favorite songs. Regardless, even an 320kbps MP3 doesn’t sound as good as the song’s WAV file version. But a 320kbps MP3 takes up four times less space than a WAV file. To use an analogy, an MP3 file is a WAV file, which is a JPEG image of a BMP image.

Problems

The second advantage is that it can be played on many types of devices, such as CD players and Apple iPods. You can also play MP3 files with multimedia players such as Winamp, Windows Media Player or QuickTime. The third advantage of MP3 is ID3 tags. The ID3 tag of an MP3 file stores the artist name, song title, year, and genre. You can also create your own playlists.

Another advantage of MP3 is that encoding is simple. It is easy to rip audio CDs and burn as easily as regular MP3 CD-Rs. The encoding speed is also very fast, but it also depends on the speed of the CD player. Producing MP3 files takes very little time. You can use lossless audio compression if you have a lot of free disk space and lossy audio compression if you have little free disk space. The MP3 LAME encoders are free and open source, so that everyone can contribute to their development.

Another plus of MP3 is that the layout is simple. MP3 can be downloaded from HTTP or FTP sites. You can also distribute MP3 files through portable storage devices such as USB flash drives. You can also buy MP3s from online music stores such as iTunes and eMusic.

You can also use a server to distribute these files. Listening to it in MP3 uses an M3U playlist format such as (which means MP3 URL) or PLS. MP3 streaming is also used by internet radio stations. You can integrate MP3 streams with a Flash player. You may have different rates for dial-up and broadband connections. MP3 audio is not stored on your hard drive.

MP3 problems

A disadvantage of MP3 is that it takes up a lot of storage space. Since an MP3 file generally takes up to 5 megabytes (MB) of disk space, the number of files it can store is limited. Due to the relatively large size of an MP3 file, the slow file can also be downloaded if you have a slow internet connection.

Another problem is that the song can jump to random places. This happens especially if you have a slow computer and use multiple programs that load the processor at the same time. It is technically not free. You also need an MP3 decoder if you want to convert MP3 audio files to WAV format. The MP3 format has very little security available. For example, people who used the Morpheus file sharing service had their computers accessible to hackers.

Another limitation is that this file is not the best fidelity format for audio files. Other audio formats, such as Ogg Vorbis and Advanced Audio Coding (AAC), are superior in quality to MP3. AAC is the format used in the Apple iTunes player. However, MP3 is still the most popular audio format in the world.

The pros and cons of MP3, which I just mentioned will help you make a good decision before downloading music next time.