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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/
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.
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.
What is Mu-Law? - EasyTechJunkie
https://www.easytechjunkie.com/what-is-mu-law.htm
ln (1 + μ) where μ = 255 (8 bits) and for a given input x. Mu-law is used for the digital telecommunication networks in North American and Japan to change the data to the supported 8 bit format. This is done after the signal or sound is received and processed by the digital computer system.
Audio codecs - Columbia University
https://www.cs.columbia.edu/~hgs/audio/codecs.html
mu-law (US, Japan) and A-law (Europe) companding G.721 ITU-T: Adaptive differential pulse code modulation (ADPCM) 32 8 sample Now described in G.726; obsolete. G.722: ITU-T: 7 kHz audio-coding within 64 kbit/s 64 16 sample Subband-codec that divides 16 kHz band into two subbands, each coded using ADPCM G.722.1: ITU-T
audio - μ-Law algorithm implementation - Stack Overflow
https://stackoverflow.com/questions/24863770/%CE%BC-law-algorithm-implementation
Here is Mu-Law encoder taken from NAudio. The question is how is this formula same with the code? I can understand that MuLawCompressTable is actually the Log but I dont get the thing about mantissa why it is taken as is.
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 11 Conversion to a logarithmic scale allows quantization intervals to increase with amplitude, and it insures that low-amplitude signals are digitized with a minimal loss of fidelity. Fewer bits per sample are necessary to provide a specified signal-to-noise ratio (SNR)
YoungEngineering A-Law and Mu-Law Companding
http://young-engineering.com/docs/YoungEngineering_ALaw_and_MuLaw_Companding.pdf
magnitude bits, the µ-law compression is defined by Equation 2, where m is the compression parameter (m =255 in the U.S. and Japan) and x is the normalized integer to be compressed. ln(1) sgn( )*ln(1 )) m m + x + x F(x) = 0 ≤ x ≤1 Equation 2, m-Law Definition The encoding and decoding process for µ-law is similar to that of A-law. There are, however, a
Comparison of G.711 and G.722 CODECs – Customer Support Portal
https://iedaudio.zendesk.com/hc/en-us/articles/360000653386-Comparison-of-G-711-and-G-722-CODECs
G.711μ (sometimes call mu-Law, uLaw, or PCMU ) and G.711A (sometimes called ALAW or PCMA) are 8kHz codecs which provide a bandwidth of roughly 300 Hz - 3400 Hz. This is the same codec as used on traditional analog telephone systems. μLaw is …
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