Adaptive Multi-Rate audio codec
Usage
The frames contain 160 samples and are 20 milliseconds long. AMR uses various techniques, such as ACELP, DTX, VAD and CNG.

Adaptive Multi-Rate audio codec

Section Title: Usage
Table Section Text: The frames contain 160 samples and are 20 milliseconds long. AMR uses various techniques, such as ACELP, DTX, VAD and CNG.

Mode	Bitrate (kbit/s)	Channel	Compatible with

AMR_12.20	12.20	FR	ETSI GSM enhanced full rate

AMR_10.20	10.20	FR

AMR_7.95	7.95	FR/HR

AMR_7.40	7.40	FR/HR	TIA/EIA IS-641 TDMA enhanced full rate

AMR_6.70	6.70	FR/HR	ARIB 6.7 kbit/s enhanced full rate

AMR_5.90	5.90	FR/HR

AMR_5.15	5.15	FR/HR

AMR_4.75	4.75	FR/HR

AMR_SID	1.80	FR/HR

Sentence(s)

The AMR codec uses eight codecs with bit-rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s.

final_sentence: The AMR codec uses eight codecs with bit-rates of 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s.