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Qualcomm code-excited linear prediction

Known as: Qualcomm PureVoice, 13k audio, 13k vocoder 
Qualcomm code-excited linear prediction (QCELP), also known as Qualcomm PureVoice, is a speech codec developed in 1994 by Qualcomm to increase the… 
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Enhanced Variable Rate CodecFFmpegVocoder

Papers overview

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2005
2005
Pitch and duration modification for speech watermarking
We propose a speech watermarking algorithm based on the modification of the pitch (fundamental frequency) and duration of the… 
2001
2001
Combined Speech and Channel Coding for Wireless Communications
In this paper, we propose acombined variable-rate code-excited linearly predictive (QCELP)speech coding and unequal error… 
1997
1997
Design of Chip Set for CDMA Mobile Station
In this paper, we present a design of modem and vocoder digital signal processor (DSP) chips for CDMA mobile station. The modem… 
1997
1997
Variable-rate CELP based on subband flatness
Code-excited linear prediction (CELP) is the predominant methodology for communications quality speech coding below 8 kbps, and… 
1995
1995
A robust variable-rate speech coder
The goal of this study is to develop a robust and high-quality speech coder for wireless communication. The proposed coder is a… 
1995
1995
FIR system identification using third- and fourth-order cumulants
A new set of equations relating the coefficients of a finite-impulse-response (FIR) system and the third- and fourth-order… 
1994
1994
A single chip QCELP vocoder for CDMA digital cellular
This paper describes a full-custom ASIC implementation of the QCELP voice compression algorithm. Applications for the ASIC are… 
1994
1994
Variable bit-rate CELP coding of speech with phonetic classification
A variable bit-rate speech coder intended for digital cellular applications is described. A voice activity detection algorithm is… 
Highly Cited
1993
Highly Cited
1993
QCELP: A Variable Rate Speech Coder for CDMA Digital Cellular
Digital cellular telephone systems require efficient encoding of speech to achieve capacity improvements required of the next… 
1993
1993
Qcelp: The North American Cdma Digital Cellular Variable Rate Speech Coding Standard
Digital cellular telephone systems require efficient encoding of speech to achieve capacity improvements required of the next… 
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