Most audio quality problems are going to be the result of codec choice and packet loss, rather than bugs in Asterisk, especially in a pure VoIP world, or where PSTN interfacing is being done outside of Asterisk. Original audio sample played by another app, one can learn more about what kind of audio distorsion takes place.ĭigital Signal Processing, CD, DVD audio mastering professionals should be of some help. Line-in and synchronising in time Asterisk audio input as one source with There is a class of sample audio files (one frequency files - I suppose) which can be used as
What professional tools, sample audio files should I use ( audio spectrum analyzer, FFT, echo canceller, adaptive in-line filters) to get sound quality problem fully and in details diagnozed. I am looking for Asterisk audio quality testing group, forum, exactly to learn The corruption will not, however, be simple harmonic distortion, so I would suggest that you either need deep technical knowledge, or you should compare by ear. That’s quite a technical problem, and I doubt that Audacity is a good tool for it.Ĭodecs like GSM and G.729 are designed for speech only, so they will not handle music well. I would suggest creating a 16 bit, 16kHz file and then using SOX to convert it into one of the formats that Asterisk can convert.Īs my Audiocity keeps saving wav as 16 bit I used another tool to get mono, 8000 Hz, 6 bit sample. Sound from Asterisk, playing audio files to a sound card via Celliax audio channel.
Having wav file opened with Audacity I can select selecting DTMF0 menuīut how to save opened wav file as mono, 8000Hz, 64 kbs on output, not in a viewer ?Īnother my question is how to use Audacity audio filters to discover what distortion come with Wav file mono, 8000Hz, 64 kbs to be played by Asterisk MusicOnHoldīasically the wav files are a mono, 8000Hz sample rate, 64 kbs.ĭoes Audacity support this file save format ? I was told to record audio stream and save to What is a relation between sample rate like 16 bits and 64 kbsĪs 8000 Hz rate can be adjusted seperately =
I am just trying to resample wav file using Audacity app