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Speech coding method and device, input signal discrimination method, speech decoding method and device and progrom providing medium

A technology of speech coding and speech signal, used in speech analysis, instruments, etc.

Inactive Publication Date: 2004-01-21
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, if you keep using the past parameters in a repetitive fashion, you get the impression that the noise has a tone of its own, creating an unnatural noise

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  • Speech coding method and device, input signal discrimination method, speech decoding method and device and progrom providing medium
  • Speech coding method and device, input signal discrimination method, speech decoding method and device and progrom providing medium
  • Speech coding method and device, input signal discrimination method, speech decoding method and device and progrom providing medium

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Embodiment Construction

[0036] Preferred embodiments of an encoding method and apparatus and a speech decoding method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

[0037] Basically, such a system can be described as analyzing the speech on the transmitting side to find coding parameters, transmitting the coding parameters and synthesizing the speech on the receiving side. Specifically, the transmitting side classifies encoding modes according to the characteristics of the input speech, and changes the bit rate to eliminate the average value of the transmission bit rate.

[0038] A specific example is a portable telephone device, the structure of which is shown in FIG. 1 . This portable telephone device uses the encoding method and apparatus and the decoding method and apparatus according to the present invention in the form of speech encoding apparatus 20 and speech decoding apparatus 31 shown in FIG. 1 .

[0039] The spee...

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Abstract

In a speech codec, the total number of transmitted bits is to be reduced to decrease the average amount of bit transmission by imparting a relatively large number of bits to the voiced speech having a crucial meaning in a speech interval and by sequentially decreasing the number of bits allocated to the unvoiced sound and to the background noise. To this end, such a system is provided which includes an rms calculating unit 2 for calculating a root means square value (effective value) of the filtered input speech signal supplied at an input terminal 1, a steady-state level calculating unit 3 for calculating the effective value from the rms value, a divider 4 for dividing the output rms value of the rms calculating unit 2 by an output min_rms of the steady-state level calculating unit 3 to fins a quotient rmsg and a fuzzy inference unit 9 for outputting a decision flag decflag from a logarithmic amplitude difference wdif from a logarithmic amplitude difference calculating unit 8.

Description

technical field [0001] The invention relates to an encoding method and apparatus for encoding an input speech signal when the bit rate in unvoiced intervals differs from the bit rate in voiced intervals. The present invention also relates to a method and apparatus for decoding encoded data encoded and transmitted with the encoding method and apparatus, and to a program providing medium for executing the encoding method and the decoding method by software-related techniques. Background technique [0002] Recently, in the field of communication that requires a transmission path, in order to achieve efficient use of transmission bandwidth, it is desired to transmit the input signal according to the type of the input signal, such as a speech signal interval divided into, for example, voiced sound and unvoiced sound, or a background noise interval, to change the encoding rate of the transmitted input signal. [0003] For example, if a given interval is verified to be an interval...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L19/14G10L19/12G10L11/06G10L19/20G10L19/24G10L25/78G10L25/84G10L25/93
CPCG10L19/18G10L19/012G10L19/002
Inventor 前田祐児西口正之
Owner SONY CORP