Your Intro to all things audio.
Welcome back to Audiophile 101. An introduction to all things audio presented by Pocket Rock It Radio. From the simple to the more advanced we’ll attempt to answer all of your audio related questions with some helpful information that’s explained in simplistic and easy to understand terms. Whether you are interested in diving deep into the world of audio, or are just looking for a simple answer to a not so simple question we hope Audiophile 101 aim to answer your music related questions quick and easy.
In this chapter we will take a look at Lossy Vs Lossless Audio, and the different of digital audio file types of each ; to answer the questions…. What are lossy audio files? What are lossless audio files?
‘Lossy Audio’ and ‘Lossless Audio’ are terms used to describe different digital file types that are used to store and play audio (music). Lossy audio is called so because the audio files are made smaller by removing [deleting] specific parts of the audio’s data. Lossless Audio can refer to two different types of files those are ‘Lossless Compression’ and ‘Lossless Audio’. Both forms of lossless audio are defined and operate differently than each-other, but both file types are considered lossless because all of the information of the original record are retained.
Lossy compressed audio files are created by removing (deleting) information that is not considered necessary for playback while maintaining an acceptable level for audio quality. For example if a soft sound happens at the same time as loud sound the quiet sound is deleted to save space, because more than likely you would not have heard the soft sound to begin with.
Another trick that’s used during lossy compression is when songs are originally recorded the full spectrum of sound is recorded. If you think of this spectrum as gigantic ocean wave you’re trying to take a picture of. If the wave is huge your camera will only be able to capture so much the wave in the picture frame, and only replicate so much detail. The human ear behaves in the same way as the camera lens and can only hear the middle of part [mid-range] of the sound extremely well. Knowing this the computer’s compression program removes the top and bottom parts of the wave that is not so easily heard to save on digital storage space. Computer compression programs make their compression decisions following rules created by digital and audio scientists.
Additional rules for what is also able to be removed from the original audio track are based on a phenomenon called psycho-acoustics. While that’s another subject in itself in simplistic terms psycho-acoustics takes into account the human brains power to fill in the gaps of what’s missing and removes even more information based on this phenomenon. All of this results in a smaller audio file that is easier to store on your digital device, and sounds similar enough to the original audio file.
Types of lossless compression audio file are FLAC and ALAC. While these audio files are technically compressed. They are called ‘lossless compression’ because while they are compressed they are compressed using computer algorithms (rules) and all of the original data of the original data from the sound recording is still technically present it just has ben modified into a smaller digital file size.
Lossless compression works by removing unnecessary data, and rewriting the existing audio data more economically removing redundancies in the audio file itself. In some cases the silence of the recording is removed to save even more digital space (yes even the silence of a song takes up data).
A file that is compressed using lossless compression is then read using an ‘Audio Codec’ [computer program] that then reads, and plays back the original audio by decoding the lossless computer language in in real time.
Lossless audio files are audio files that are completely uncompressed. Examples of this would be the WAV and AIFF audio file format. These two audio files types are traditionally very heavy (a lot of data) in file size, and for that reason are primarily utilized by people in the music, and entertainment production industries. It doesn’t mean you can’t use them yourself, it just means you better have a big hard-drive to store all that extra information that comes along with using them.
No. Now, obviously you can listen to a lossless audio file with bluetooth headphones or speakers in the sense that your music will play, and you will enjoy it but you will not get the full lossless affect.
This is because no matter how good your bluetooth headphones or speakers are it doesn’t change the fact that the lossless audio signal is being sent using a bluetooth codec for transmission, during this the signal is being compressed for economy in data transfer between your playback device and your bluetooth device. It is true that there are higher quality blue-tooth codecs [transmitters] available, but there are also other signal degrading issues when transmitting bluetooth such as distance from transceiver and other environmental factors that lead to sound degradation.
At the end of the day if you want to get the most of your lossless audio experience use wired headphones, or a good quality wired speaker setup is the way to go.
No. Lossy compression isn’t a bad thing. Yes, it’s true you’re not getting the full audio experience, but the fact remains that with standard listening equipment a lossy compressed audio file with a high bit rate will more often than not sound just as good as a lossless audio file. Meaning that the average listener using average equipment wont be able to tell the difference.
How good a audio file sounds comes down to the files bit rate or bits per second. How many bits per second a digital file is, is the better that audio file will be capable of sounding. For instance a CD audio file plays at 1,411 kbps (kilobits per second) perfect digital quality, and if you have the proper equipment and it all properly set up all that extra detail and information is fantastic.
However, that doesn’t change the fact it is still a lot more detail than the human ear can even pick up on, and more than most basic home or personal audio equipment can transmit. So a audio file in a lossy compressed format can still maintain good to high sound quality. [Provided the bit rate is on the higher side].
If you’re interested in an enhanced listening experience but don’t have the means or equipment to get into lossless audio, try to keep the bit rate of your lossy audio files over 190 kbps. You’ll come to find once you cross above 200 bits per second you’ll be hard pressed to tell the difference between lossy and lossless audio file.
So there you have it, you should now you have a better handle on the discussion of of lossy vs. lossless audio. At the end of the day most folks can get by with a lossy audio files with a good bit rate.
However, if you’re looking to take your music enjoyment to the next level, and want to start to invest in some listening upgrades lossless may be the next step in your Audiophile story. We look forward to helping you along the way.
Until next time, Happy Listening.
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