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Relative pulse position of code-excited linear predict voice coding

A technology of pulse position and speech coding, which is applied in speech analysis, code conversion, instruments, etc., and can solve the problems of increasing the number of calls and reducing transmission bandwidth, etc.

Inactive Publication Date: 2002-02-27
LUCENT TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is possible to increase the number of calls in the same communication channel by reducing the transmission bandwidth required for each call

Method used

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  • Relative pulse position of code-excited linear predict voice coding
  • Relative pulse position of code-excited linear predict voice coding
  • Relative pulse position of code-excited linear predict voice coding

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Embodiment Construction

[0024] Image 6 In , a two-track codebook table with relatively constrained pulse positions is shown. The table 500 includes two pulse position traces 502, 504 (commonly referred to as traces), on each of which 16 possible signal pulse positions 506 can be identified. Fixed codebook entry zero is a possible valid pulse position there by 502 of trace 1 and 508 at the 13th position in 504 of trace 2. The 510 in the 14th position and the 512 in the 15th position in the pulse table position in the codebook are unused in both tracks. In addition, the possible first pulse positions in the first track are constrained to lie on pulse positions divisible by 4 (ie, 0, 4, 8, . . . , 52). The second pulse position in the second trace is relative to the index position 506 of the first signal pulse in the first trace.

[0025] Instead of encoding the signal pulses into adjacent track positions, a relative positioning of the second signal pulses is produced. By having fewer adjacent sign...

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PUM

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Abstract

An apparatus and method for vocoding an input signal comprising a linear predictive filter for generating a filtered signal with a first signal pulse and a second signal pulse in response to receiving the input signal and a processor having a lookup table with a plurality of track positions. The first signal pulse is associated with a first track position and the second signal pulse is associated with a second track position relative to the first signal pulse resulting in a plurality of excitation parameters.

Description

technical field [0001] The present invention relates to speech compression, and in particular to Code Excited Linear Prediction (CELP) speech coding. Background technique [0002] Speech coders / decoders (vocoders, automatic speech synthesizers) compress speech signals in order to reduce the required transmission bandwidth in the communication channel. By reducing the transmission bandwidth required for each call, it is possible to increase the number of calls in the same communication channel. In earlier speech coding techniques, such as linear predictive coding (LPC) techniques, a filter was applied to remove signal redundancy, thereby compressing the speech signal. The LPC filter reproduces a spectral envelope in an attempt to mimic human speech. In addition, the LPC filter is excited by quasi-periodic inputs received on nasal and vowel sounds, while noise-like inputs are received on non-speech sounds. [0003] There is a class of vocoders known as Code Excited Linear P...

Claims

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Application Information

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IPC IPC(8): G10L19/12G10L19/00G10L19/10H03M7/36
CPCG10L19/10G10L19/04G10L19/12
Inventor 史蒂文·A·本诺
Owner LUCENT TECH INC