I am new to encoding in audios and i have searched for ulaw and alaw and found there is conversion from audio to this encoding CCITT alaw/ulaw and as i have known alaw/ulaw belongs to ITUT group not CCITT so Is there two standards for conversion audio to alaw/mulaw ?

here is the ITU-T and this conversion about CITT ulaw


Yes. You can choose the µ parameter freely in µ-law encoding. So, there's as many different µ-law encodings as there are possible µ; of course, only very few are standardized.

The same applies to the A in A-law.

You might want to read the wikipedia articles on µ-law and A-law, instead of just the G.711 article.

  • $\begingroup$ you are talking about choosing parameters to change expanding and compression of the signal but what i want to know is that there is two standards for ulaw and alaw or not ? $\endgroup$ – Mohamed Lotfy Elrefai Jun 23 '20 at 11:39
  • $\begingroup$ I explicitly answered that. $\endgroup$ – Marcus Müller Jun 23 '20 at 11:46
  • $\begingroup$ maybe the confusion for me as ITUT and CCITT have become as CCITT so this is the confusion of my understanding so i thought there is no more than one ulaw/alaw CCITT $\endgroup$ – Mohamed Lotfy Elrefai Jun 23 '20 at 16:40

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