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How many KB is the best sound quality for mp3? Part 2

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How many KB is the best sound quality for mp3? Part 2

The most widely used decoder chip on the market today is, of course, the well-known STMP3410 from Sigmatel.

Whenever you disassemble your mp3, you will find that your mp3 uses STMP3410 decoder chip. The decoder chip is highly integrated and has concentrated functions. It is easy for manufacturers to develop or add new features such as letter display and electronic dictionary. The relative cost is relatively low. It ranges from high-end brands like Samsung, MSC, and Giving to some misc and even names All brands that cannot be called are used, the sound quality is quite satisfactory, the low frequency is a bit weak, the voices and the musical instruments are not bad. Of course, the sound quality performance of mp3 using STMP3410 decoder chip is not the same and sometimes even very different. The reason lies in the internal circuit design of the mp3, the soldering process, the material of the circuit board, and the difference between various manufacturers, especially There is a big difference between the big manufacturers and some non-brand manufacturers. These are also the key factors that affect the work of the decoding chip and the sound quality output. Take two high-end machines that also use the STMP3410 chip and compare the unbranded machines to understand. Therefore, due to many factors within the mp3, the price of the mp3 that also uses the STMP3410 chip varies.
What’s more, there are some unscrupulous manufacturers on the market who use discarded or recycled second-hand FLASH chips, along with inferior circuit design, quickly made an mp3 and sold it to the market. Usually the price of this kind of mp3 is very low, and the 128m memory is sometimes cheaper than the same capacity U disk, and the sound quality can be described as rubbish. Come to think of it, we all know that manufacturers have to survive on such a small profit, unless there is something in the mp3, who will make it for free? So when you come across this kind of mp3, you should pay more attention, no matter how good the sound quality is, it can’t be better. Other decoder chips such as Sigmatel’s STMP1342, Telechip’s TCC730, Samsung’s S3C2410, etc. will not be discussed in detail due to their similar performance.
With the deepening of the market, some powerful manufacturers are also constantly exploring to dedicate the best sound quality to consumers. JNC’s new SSF-800 machine uses the SIGMATEL3420 chip, and the sound quality is very impressive. The next new mp3 just released by iriver uses the most powerful SIGMATEL3520, which is worth waiting for. The good news is that the Meizu me released by the national brand Meizu also uses the SIGMATEL3520 decoder chip, which is the first time for a national brand. It appears that the national brand is slowly creeping into the ranks of premium sound effects as well.
Second, the quality of music playback files The
decoding chip is important, but in order to enjoy high-quality music, the factor that affects the sound source itself is very large. In turn, the quality of the audio source depends on the music file format and compression ratio. Nowadays, the most popular music formats are of course mp3 and wma, almost all mp3 players support these two formats. MP3 should be considered as the most lossy compressed digital audio format currently used by users. The mp3 files that we usually listen to have a bit compression rate of 128kbps, the compression rate is about 1:10, and the file size is usually only 4m. to a more balanced position. The compression rate of the songs we download from the Internet is usually relatively low, often only 96kbps or even less, and the effect is not very ideal. This is a practice where websites deliberately lower the compression rate due to download speed and copyright issues. To enjoy real sound quality, the best way is to find a better quality CD disc and compress it yourself. Generally speaking, the sound quality of mp3 files with a compression ratio of 192 kbps is relatively good. When played with a good mp3 player, the effect is very similar to md. If compressed to 320 kbps, the sound quality is very similar. to the CD player It’s hard to tell the difference. (Of course, those with golden ears are excluded)

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How many KB is the best sound quality for mp3?

Mp3 Quality

Four Factors That Determine MP3 Sound Quality

Mp3 Quality

Today’s mp3 market can be described as a hundred flowers in bloom, and the competition between the major manufacturers is splendid. In order to take the lead and gain the most market share, various manufacturers, especially those with strength, have their own unique tricks. In terms of appearance, mpio’s fl200 has won the award with its mini round cake design. unique pendant. The latest mp3 title, Truly’s mp379, also created the trend of big screen mp3, and Samsung also released its sports mp3 concept, which is absolutely stunning in the market. Some small manufacturers have also adopted imitation methods, making the market of all kinds of mp3 like a sky full of countless stars. Simple repeat, record and fm functions can also meet the needs of the market. Line-in, features, e-book reading, gaming, and colorful backlights are slowly creeping into the new mp3 design. However, the author believes that no matter how cool it looks and how perfect its functions are, the mp3 is used to enjoy music in the final analysis. An mp3 without good sound quality is at least not a qualified mp3. If you just go for looks and function (actually, we rarely use some functions), and ignore its sound quality performance, you will feel a bit like buying a scorpion.
A decoder chip inherent in mp3
The decoder chip used by the Mp3 itself is the key to its sound quality. The sound quality displayed by high quality decoder chips is unmatched by those of the poorest. Friends who have listened to the famous iriver series of mp3s will know that its sound quality characteristics are very obvious, the bass is strong and powerful, the vocals are restored to truth, the high-frequency field is wide, and the increase is enough, which is very pleasing to the ears. This series mp3 adopts Philips SAA7750, the most advanced decoder chip in the market, and its quality and performance are excellent. The major Korean manufacturer MPIPO (Dewei Technology) also uses this decoder chip. The reputation and market feedback of these two mp3 sound quality brands are very good, and they are highly praised by the industry and outside the industry. It proves that mp3 sound quality is better than md’s ace gun. Due to the relatively high cost of the chip and the control chip, it is rarely used except for some brands. The cost is high, and the price is of course expensive. This is also the threshold that restricts many mp3 lovers from enjoying the beautiful sound quality.

What is the difference between 128k and 320k music?

Some time ago, a colleague came across a very troubled client. The mess was said to have been caused by the client asking him to provide song files larger than 100MB-200MB in size.

And my colleagues don’t know much about audio formats, so they started endlessly fumbling about FLAC, WAV and audio size. In the end, the colleague did not clearly explain to the customer what was going on.

After that, other things happened that made me feel that in the music industry there are too many practitioners around me who have an extremely poor understanding of music and even lack some basic knowledge related to music. I don’t even have the idea to understand, which makes me very sad. It seems that music has only one merchandise attribute, and our practitioners only need to organize the shelves, encode various merchandise, and use the big data of users’ purchase records to recommend merchandise to users, no matter why to users. they like this. features that these products have, and provide users with various services with cold data.

Therefore, I think it is necessary to write something. I don’t expect practitioners to become people who really love music. I just hope that even if you still think of “her” as a commodity, you can first figure out what you’re selling. and what is..

PS: The content of the first lesson is about media files. Since the relevant content involves a lot of technical issues, it seems a bit boring, but if you read it carefully, you will find that it is actually very easy to understand, but this basic knowledge can be very helpful.Improve your skill well. Also expect more interesting content about records, musical styles, etc. which I will post soon.

【text】

Bit Rate, Sample Rate, Lossless, MP3, FLAC, APE, 320kb, 192kb, 128kb, 44.1khz, CBR, VBR. Does this bunch of various names make you both familiar and unknown?

The higher the bitrate, the better the sound quality. Lossless music is the highest sound quality, right? So, let’s start with the sound collection.

【Audio composition】

Nowadays, when we talk about audio, everything is digital audio. Digital audio consists of three parts: sample rate, sample precision, and number of sound channels.

Sample Rate: Both the sample rate, which refers to the number of samples per second when recording the sound, expressed in Hertz (Hz).

Sampling Precision: Refers to the dynamic range of the recorded sound, measured in bits (Bit).

What is the recording bitrate (the appropriate mp3 bitrate range)

All music on the web is digital, so what does the “bitrate” or “kbps” you see when previewing or downloading mean? What is bit rate?

In its simplest terms, bitrate represents the amount of data a file produces per second.

For example, you might see something like “320 kbps.” Literally, that means 320 kilobits per second, or the amount of data that is produced.

How does bitrate affect music?
Common audio file formats are MP3, OGG Vorbis, or AAC, which can be called lossy compression, while others are lossless compression, such as FLAC or WAV, which basically retain all the audio information.

320k is the highest bitrate encoding of mp3, and the sound quality is generally considered to be the closest to CD format. If you listen to popular music, you can see that there is more music encoded in 196k. From the point of view of listening, the difference between 320k encoding and uncompressed encoding is negligible, but in theory, the bit rate of a common CD is 1411k, which is 4.5 times the bit rate highest of MP3.

There is a direct relationship between bit rate and sound quality, but reasonable compression does not degrade listening.

Since MP3s are lossy files, meaning some of the audio is lost due to compression, why don’t the ears seem to change the sound? This involves psychoacoustics, a fringe discipline that studies the relationship between sound and the hearing it provokes. Psychoacoustics refers to “the way the human brain interprets sound.” Compressed audio is the use of powerful algorithms to convert audio messages that we cannot hear. remote.

So even though the bitrate of a lossy file like MP3 is much lower than that of a lossless file, it doesn’t sound like that. Even with just 320kbps MP3, the listening experience is not 4.5 times worse than music on CD.

Of course, the compression is not unlimited, when the bit rate drops below 128kbps, the sound quality will be degraded, and the lower it is, the more obvious it will be. On the contrary, the higher the bitrate, the higher the quality of the music.

Mp3 ape flac What is the difference between the three music formats?

When we often download songs, we want to download some of the best sound quality, and we are also confused about which sound quality is the best.

If you ask the friends around you, they will definitely all say that you want to download lossless files, but how good is the sound quality of lossless files?

First of all, the first impression is that the volume of lossless files is obviously different from normal MP3 files. Normally, the size of normal MP3 music file is only 2-5M, but the volume of lossless APE files of the same version is about 30M, a difference of 10M times more.

In the case of the same playback time, why is there such a big volume difference?

Here to talk about a term – bitrate It is a data factor that determines whether the quality of a song file is good or bad, bitrate refers to the number of bits transmitted per second (bit). The unit is bps (bits per second). The higher the bit rate, the higher the data transmission speed. The bit rate in sound refers to the amount of binary data per unit of time after converting an analog sound signal (a signal with sound properties such as amplitude and frequency) into a digital sound signal (i.e., a binary signal such as 010101 stored on a computer’s hard drive) is an indirect measure of audio quality. The principle of bit rate (bit rate) in video is the same as in sound, which refers to the amount of binary data per unit of time after the analog signal is converted to a digital signal.

Bitrate Property for Lossless Files

Bitrate Properties for High Quality MP3

The bit rate of MP3 files with ordinary sound quality is generally 128 kbps, the bit rate of high-quality MP3 files is generally 320 kbps, and the bit rate of lossless files is generally 960 kbps. kbps or even more. The difference in bit rate can be understood as the vibration frequency of the sound decoded by the decoder at the same time. The higher the bit rate, the higher the vibration frequency and the better the corresponding sound. Good timbre means that the restoration of sound details is relatively complete, that is, the sound quality is good. However, this is also the reason for the large size of the lossless files.

Bit rate

Bit rate refers to the number of bits (bit) transmitted per unit of time, in bps (bit per second).

Bit rate is also known as “binary bit rate”, commonly known as “code rate”. Indicates the number of bits transmitted per unit of time. It is used to measure the transmission speed of digital information, often written as bit/sec. According to the number of bits occupied by each image storage frame and the transmission bit rate, the digital image information transmission speed can be calculated [1].
In modern digital communication, the transmission volume of digitized video and other information is large, so it is often measured in kilobits per second or megabits per second, which are written as kbit/sec (or kbps) and Mbit/sec. (or Mbps respectively). ). For example, the amount of information digitized from an ordinary color TV signal can reach 216 Mbit/sec. A good digital broadcast channel can transmit dozens of color TV programs, and its capacity can reach several gigabits or gigabits per second (written as Gbit/sec or Gbps) [1] .
Bitrate is often used to measure the quality of video files.
Bitrate is often used to measure the quality of video files.
flexibility edit stream
Because each network is unique and each access line has different conditions (such as length, attenuation, crosstalk environment, etc.), access lines from different telephone companies must support different data rates. For ADSL and VDSL modems, it is best to set the data rate to one of many possible data rates. For example, DMT-based ADSL and VDSL can theoretically change the tariff at fine intervals, and CAP-based RADSL (Rate Adaptive ADSL) also provides some flexibility in tariff configuration [2].
However, telephone companies may want to limit xDSL service to a small set of rates sufficient to provide a variety of services. If a limited set of tariffs can be adapted to a wide range of services, then the management of the services in this case is simpler than in the case of variable tariffs. Telephone companies want the choice of modem speed to be under the control of the network, not the user [2] .
In this mode, the selection of the transmission rate set of the xDSL network must be prudent. In this case, there is a possibility that two adjacent systems receive traffic at very different rates and the system must be able to handle such a situation. The other model, the “best match” approach using adaptive rate ADSL (similar to a voiceband modem), is more beneficial to new network operators and Internet Service Providers (ISPs) [2] .
Transmission control method
Most bit rate control schemes consist of two parts. Part of the encoded bit stream output by the encoder is fed into a buffer. For a constant bitrate channel, the data in the buffer is fetched at a constant rate, and if the buffer is large enough, the bitrate variation caused by the MPEG picture type, etc. can be smoothed out. This is necessary for both constant bit rate transmission and variable bit rate transmission in general. However, in practice, the buffer size is always limited. The buffering process will bring a delay to the system, and this delay is proportional to the size of the buffer. Latency is often a serious issue for real-time image communication, so buffers should be kept as small as possible. That is, long-term fluctuations in bitrate due to changes in scene content or changes, etc. they cannot be softened in this way, so another part is needed. This is to send some measure of the output bitrate to the encoder to control the encoding process, thus changing the output bitrate [3] .

Quality (bit rate)

In multimedia technology, quality is often used to judge the effect of audio, and quality here is actually bitrate.

1. Introduction
2 sound control
3 encoding mode
Introductionedit transmission
The term quality is widely used.
In multimedia technology, quality is often used to judge the effect of audio, and quality here is actually bitrate.
On WINDOWS it is called “bit rate” and on some players it is described as ” bit rate “.
Quality refers to the bit rate at which digital sound is converted from analog to digital format. The higher the bitrate, the better the quality of the restored sound.
sound control edit stream
16 Kbps = phone quality
24 Kbps = increase phone quality, shortwave transmission, longwave transmission, European standard medium wave transmission
40 Kbps = American standard medium wave transmission
56Kbps=Voice
64 Kbps = boost voice (best bitrate setting for cell phone ringtones, best setting for cell phone mono MP3 players)
112 Kbps = FM stereo broadcast FM 128 Kbps = tape (best setting for mobile phone stereo MP3 player, best setting for low-end MP3 player)
160 Kbps = HIFI high fidelity (best setting for mid to high end MP3 players)
192Kbps=CD (best setting for high-end MP3 players)
256Kbps=Studio Music Studio (for music enthusiasts)
In fact, with the advancement of technology, the quality of music is also getting higher and higher, the highest quality of MP3 is 320Kbps, but some formats can achieve higher sound quality.
For example, the emerging APE audio format can provide real audiophile level lossless sound quality and smaller volume than WAV format, and its quality is usually 550kbps-950kbps.
encoding modeedit stream
VBR (Variable Bitrate) Dynamic Bitrate means there is no fixed bitrate. The compression software immediately determines which bitrate to use based on the audio data being compressed. This is a method that takes quality as a premise and takes file size into account The recommended encoding mode;
ABR Average Bit Rate (Average Bit Rate) is an interpolation parameter of VBR. LAME created this encoding mode in response to the low file volume ratio of CBR and the variable size of files generated by VBR. Within the specified file size, ABR takes every 50 frames (about 1 second for 30 frames) as a segment. High-frequency and insensitive frequencies use relatively low traffic, and low-frequency and large dynamic performance use high traffic, which can be used as VBR and CBR, a compromise option.
CBR (constant bitrate), constant bitrate means the file has one bitrate from start to finish. Compared to VBR and ABR, the compressed file size is very large and the sound quality will not improve significantly compared to VBR and ABR.

How does the bit rate affect the quality of the music?

How does the bit rate affect the quality of the music?

Does the bit rate affect the quality of the music?

There is a lot of talk these days that we have lost real music with the advent of compressed audio formats like MP3, AAC and the like. Is it really so? Will lossless music save music? Can an inexperienced listener tell the difference between MP3 and FLAC music? Let’s take a look at this problem.

What is Bitrate?

You’ve probably heard the term “bitrate” before and you probably have a basic idea of what it means, but it might be a good idea to familiarize yourself with its official definition so you know how it all works.

Bit rate is the number of bits or the amount of data that is processed over a period of time. In audio, this generally means kilobits per second. For example, the music you buy from iTunes is 256 kilobytes per second, which means that every second of the song contains 256 kilobytes of data.

The higher the bit rate of the track, the more space it will take up on your computer. Audio CDs typically take up quite a bit of space, so it has become common practice to compress these files so that you can burn more music to your hard drive (or iPod, Dropbox or whatever). This is where the “lossy” and “lossy” formats conflict.

Lossless and Lossy formats: what’s the difference?

When we say lossless, we mean that we haven’t really changed the original file. That is, we copy a track from the CD to our hard drive, but we do not compress it to the point of losing data. Essentially the same as the original CD track.

However, most of the time, you will probably extract your music in Lossy format. That is, you took a CD, copied it to your hard drive, and compressed the tracks so they don’t take up a lot of space. A typical MP3 or AAC album is probably about 100MB. The same album in a lossless format like FLAC or ALAC (aka Apple Lossless) will be around 300MB, so it has become common practice to use lossy formats for faster downloads and more hard drive savings. .

The problem is that when you compress a file to save space, you are removing chunks of data. Just like when you take a high quality image and compress it to JPEG, your computer grabs the raw data and “tricks” certain parts of the image into being basically the same, but with some loss of clarity and quality.

An example of how the JPEG graphics compression algorithm works
Remember that you are saving hard drive space by compressing music in lossy formats, which can make a big difference for an iPhone with 32GB of storage, but is only a trade-off in terms of size / quality.

There are different levels of compression: 128 Kbps, for example, takes up very little space, but it will also have a lower quality of playback than a larger 320 Kbps file, which in turn is of lower quality than the 1,411 reference file Kbps. From. 1,411 kbps is an audio CD level quality, which is more than sufficient in most cases.

The problem is not how much the music is compressed, but what equipment you listen to it on.

Does bit rate really matter?

As memory gets cheaper every year, listening to sound at a higher bit rate, or even lossless formats, is starting to become more and more popular. But is it worth the time, effort, and storage space on your phone or computer?

I don’t like answering questions this way, but sadly the answer is: it depends.

Part of the equation is the hardware you use. If you are using a good quality pair of headphones or speakers, you are used to wide frequency and dynamic range. As such, you are more likely to notice the downsides that come with compressing music into lower bitrate files. You may notice that low-quality MP3 files lack a certain level of detail; Subtle backing tracks may be harder to hear, the highs and lows won’t be as dynamic, or you may hear distortion in the lead vocal. In these cases, you may want a higher bit rate track.

However, if you’re listening to your music with a cheap pair of headphones on your iPod, you probably won’t notice the difference between a 128Kbps file and a 320Kbps file, let alone 1,411Kbps lossless music. Remember when you I showed the image a few paragraphs above and noticed that you probably had to look at it to see the flaws? Your headphones are like a truncated version of the image: they will make these imperfections difficult to perceive, as they are not physically capable of reproducing the music for you the way you want them to.

The other part of the equation is, of course, your own ears. It can be very difficult for some people to distinguish between two different bit rates for the simple reason: they listen to little music. Listening skills, like any other, develop with practice. If you listen to your favorite music often and a lot, your hearing becomes more accurate and begins to pick up small details and midtones. But until then, doesn’t it really matter what bitrate you use?

So what format and bit rate should you choose yourself? Is 320 Kbps enough for you or do you definitely need Lossless format?

The point is that it is difficult to hear the difference between a lossless file and a 320Kbps MP3 file. To hear the difference, you need serious high-quality equipment, good hearing, and some kind of music (for example, classical or jazz). .

For the vast majority of people, 320 Kbps is more than enough to listen to.

What else should you consider?

Music recorded in the Lossless format can be useful. Lossless files are more reliable in the future, in the sense that you can always compress them to Lossy format when you need to, but you can’t do the opposite and restore original CD quality from MP3 file. This, again, is one of the fundamental problems of online music stores: if you have created a huge music library on iTunes and one day you decide that you need more bitrate, you will have to buy it again, but this time only in CD format . …

Whenever I can, I always buy or copy music in Lossless format for backup.

I understand that audiophiles are like a needle under your nails. Like I said, it all depends on you, your audition and the equipment you have.

Compare two tracks recorded in Lossless and Lossy formats. Try a few different audio formats, listen to them for a while and see if it makes a difference for you or not.