Qualcomm code-excited linear prediction

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Qualcomm PureVoice

Filename extension	.qcp
Internet media type	audio/qcelp
Developed by	Qualcomm
Initial release	1994; 30 years ago (1994)
Latest release	TIA IS-733 December 1999; 24 years ago (1999-12)
Type of format	Lossy audio
Open format?	Yes
Free format?	No

Qualcomm code-excited linear prediction (QCELP), also known as Qualcomm PureVoice, is a

(Kbit/s) respectively.

In

the information more efficiently. In particular, it can change its own coding rates based on the speaker's volume or pitch; a louder or higher-pitched voice requires a higher rate.

References

• https://web.archive.org/web/20130129041829/http://www.rfdh.com/ez/system/db/lib_jnl/upload/2489/[CSD9904]_QCELP_Vocoders_in_CDMA_Systems_Design.pdf
• Archived PureVoice encoder and player downloads