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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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2003
2003
The QCP File Format and Media Types for Speech Data
RFC 2658 specifies the streaming format for 3GPP2 13K vocoder (High Rate Speech Service Option 17 for Wideband Spread Spectrum… 
2002
2002
The effect of speech compression on second language speech perception learning
In recent years, second language education is sometimes conducted over the Internet. However, the speech used for training is… 
2001
2001
A Compiler-Friendly RISC-Based Digital Signal Processor Synthesis and Performance Evaluation
As DSP (Digital Signal Processing) applications become more complex, there is also a growing need for new architectures… 
2000
2000
QCELP 보코더의 최적화 및 실시간 구현 = Optimization and real-time implementation of QCELP vocoder
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
Performance Improvement of the QCELP using an Efficient LSF Coding
The hydrophones is mounted in many applications on a vibrating surface and functions as an underwater acoustic signal receiver… 
1997
1997
Improved Excitation Coding for 13 kbps Variable Rate QCELP Coder
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… 
1995
1995
An Identification Method for Complex-Valued Material Properties of Piezoelectric Ceramics
The common practice for the identification of piezoelectric properties is based on the use of immittance of a resonator with a… 
1994
1994
TMS320C50을 이용한 CDMA 디지털 이동통신용 음성부호화기 구현 ( Implementation of Variable Rate QCELP Codec for CDMA Digital Cellular Using TMS320C50 DSP )