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GSM Audio Codec / Vocoder - Electronics Notes
https://www.electronics-notes.com/articles/connectivity/2g-gsm/audio-codecs-vocoders-amr-celp.php#:~:text=GSM%20Audio%20Codecs%20%20%20%20Codec%20name,%20%20ACELP%20%201%20more%20rows%20
GSM Audio Codec / Vocoder - Electronics Notes
https://www.electronics-notes.com/articles/connectivity/2g-gsm/audio-codecs-vocoders-amr-celp.php
Unified Messaging audio codecs: Exchange 2013 Help ...
https://docs.microsoft.com/en-us/exchange/audio-codecs-exchange-2013-help
The GSM audio codec creates .wav audio files that are compressed. GSM .wav audio files are just over 16,000 bytes for each 10 seconds of audio. However, GSM creates an audio file larger than the audio file created by the WMA audio codec.
gsm codec - VoIP SIP SDK
https://voip-sip-sdk.com/p_7219-gsm-codec.html
GSM has used a variety of voice codecs to compress 3.1 kHz audio into between 6.5 and 13 kbps. Two codecs were designed originally, called Half Rate and Full Rate codecs. They were named after the data channel types that were used. Both Half Rate and Full Rate codecs use a system that is based on LPC (Linear Predictive Coding).
Voice Codecs - GL
https://www.gl.com/voice-codecs.html
Codec Bit Rate (Kbps) Number of bits per second which needs to be transmitted to deliver a voice call. (codec bit rate = codec sample size / codec sample interval). We can calculate bit-rate as follows: For G.711 – 64 kbps = (160 bytes * 8 bits) * (1/20 ms) For G.729 – 8 kbps = (20 bytes * 8 bits) * (1/20 ms) Voice Payload in Bytes
GSM voice call - GSM modem
http://www.gsm-modem.de/gsm-voice-call.html
This voice codec was first standard used in GSM. Its average bit rate is 13 kbit/s. The quality of speech is less by modern standards, but was a good compromise between complexity and quality. Step by step FR will be replaced by Enhanced Full Rate and Adaptive Multi-Rate, which offer much higher speech quality with a lower bit rate.
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