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Mu-Law and A-Law Compression Tutorial – Jonathan Hays
https://jonathanhays.me/2018/11/14/mu-law-and-a-law-compression-tutorial/#:~:text=In%20a%20typical%20mu-law%20system%2C%20linear%20samples%20of,sound%20is%20represented%20as%20a%20wave%2C%20and%20humans
5.3.8 Algorithms for Audio Companding and …
http://digitalsoundandmusic.com/5-3-8-algorithms-for-audio-companding-and-compression/
Mu-law encoding (and its relative, A-law, which is used Europe) reduces the amount of data in an audio signal by quantizing low-amplitude signals with more precision than high amplitude ones. However, since this bit-depth reduction happens in conjunction with digitization, it might more properly be considered a conversion rather than a compression method.
Mu-Law and A-Law Compression Tutorial – Jonathan Hays
https://jonathanhays.me/2018/11/14/mu-law-and-a-law-compression-tutorial/
than a high level. In a typical mu-law system, linear samples of 14 to 16 bits are companded to 8 bits. Most telephone quality codecs (including the Sparcstation’s audio codec) use mu-law encoded samples. In simpler terms, this means that sound is represented as a wave, and humans can only hear audio in the middle of the wave.
µ-Law Compressed Sound Format
https://www.loc.gov/preservation/digital/formats/fdd/fdd000039.shtml
"Mu-law (also written µ-Law) is the encoding scheme used in North America and Japan for voice traffic. A-Law (or a-Law) is used in Europe and throughout the rest of the world. The two schemes are very similar. Both break the total dynamic range into eight positive and eight negative segments.
A-Law and mu-Law Companding Implementations …
https://www.ti.com/lit/an/spra163a/spra163a.pdf
A-Law and mu-Law Companding Implementations Using the TMS320C54x 9 Figure 1. Sample Speech Signal: GOAT Each phoneme class brings its own stress to the telephone system. In general, the peak to peak amplitude of voiced phonemes is approximately ten times that of unvoiced and plosive phonemes, as clearly illustrated in Figure 1. As a result, the
YoungEngineering A-Law and Mu-Law Companding
http://young-engineering.com/docs/YoungEngineering_ALaw_and_MuLaw_Companding.pdf
A-Law/Mu-Law Companding Page 2 of 4 Young Engineering: www.young-engineering.com Table 1 illustrates an A-law encoding table. The sign bit of the linear input data is omitted from the table. The sign bit (S) for the 8-bit code is set to 1 if the input sample is negative, and is set to 0 if the input sample is positive.
c# - Using NAudio to decode mu-law audio - Stack Overflow
https://stackoverflow.com/questions/4234665/using-naudio-to-decode-mu-law-audio
Since you just have raw mu-law data, you can't use a WaveFileReader on it. Instead, create a new class that inherits from WaveStream. In its Read method, return data from tmpMemStream. As a WaveFormat return a mu-law WaveFormat. Here's a generic helper class that you could use:
AUDIO AND VOICE COMPRESSION - NCSU
http://reeves.csc.ncsu.edu/Classes/csc557/2001-fall/lectures/audio-compression.pdf
Mu-Law 8 8 bits 64 PCM G.711 200-3200 IMA-ADPCM 200-20000 ADPCM 8-44.1 4 bits 32-350 Bit Rate (Kb/s Sampling Precision Rate (KHz) Compressi on Method Frequency Range (Hz) Standard
A comparison of Internet audio compression formats
https://sericyb.com.au/audio.html
mu-law mu-law is the international standard telephony encoding format, also known as ITU (formerly CCITT) standard G.711. It packs each 16-bit sample into 8 bits by using a logarithmic table to encode with a 13-bit dynamic range and dropping the least significant 3 bits of precision. Encoding and decoding is very fast and support is universal.
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