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Speech communication system and method for handling lost frames

A technology for voice communication and lost frames, applied in the field of 1999, can solve problems such as loss of synchronization

Inactive Publication Date: 2003-09-10
HTC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a noisy frame is lost and not received by the decoder, the encoder and decoder use different seed values ​​for the same noisy frame, thus losing their synchronization

Method used

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  • Speech communication system and method for handling lost frames
  • Speech communication system and method for handling lost frames
  • Speech communication system and method for handling lost frames

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Embodiment Construction

[0053] First, a general description of the entire voice communication system is given, and then the embodiments of the present invention are described in detail.

[0054] Figure 1 is a schematic block diagram of a speech communication system showing the general use of speech encoders and decoders in a communication system. The voice communication system 100 transmits and reproduces voice through a communication channel 103 . Communication channel 103 may comprise, for example, a wire, fiber optic, or optical link, but typically at least partially comprises a radio frequency link, as found in cellular telephones, which often must support multiple communication networks requiring shared bandwidth resources. road and voice exchange at the same time.

[0055] A storage device may be connected to the communication channel 103 to temporarily store voice information for delayed reproduction or playback, eg, to perform answering machine functions, voice mail, and the like. Similarly...

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Abstract

The invention relates to a method of reproducing decoded speech in a communication system comprising: receiving speech parameters including an adaptive codebook gain and a fixed codebook gain for each subframe on a frame-by-frame basis, making a periodical decision whether the speech is a periodic speech or a non-periodic speech using the received speech parameters, detecting whether a current frame of speech parameters is lost, making a decision (1000, 1030) whether the current lost frame is a first lost frame after a received frame or not a first lost frame after a received frame, setting (1004, 1008, 1010, 1020, 1022) a gain parameter for the current lost frame based on the periodical decision and on the decision whether the current lost frame is a first lost frame after a received frame or not a first lost frame after a received frame and using the gain parameter for the reproducing of the speech signal.

Description

[0001] References [0002] The following U.S. patent applications are hereby incorporated by reference in their entirety and made a part of this application: [0003] U.S. Patent Application Serial No. 09 / 156,650, "Speech Encoder Using Gain Normalization That Combines Open AndClosed Loop Gain," filed September 18, 1998, Conexant Docket No. 98RSS399; [0004] U.S. Provisional Application Serial No. 60 / 155,321, "4 kbits / s Speech Coding," Conexant Docket No. 99RSS485, filed September 22, 1999; and [0005] US Patent Application Serial No. 09 / 574,396, "A New Speech Gain Quantization Strategy," filed May 19, 2000, Conexant Docket No. 99RSS312. Background technique [0006] This invention relates generally to the encoding and decryption of speech in voice communication systems, and more particularly to methods and apparatus for handling erroneous or lost frames. [0007] To model basic speech, the speech signal is sampled in time and stored frame by frame as discrete waveforms to ...

Claims

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Application Information

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IPC IPC(8): G10L13/00G10L19/005G10L19/04H03M7/30H03M7/36H04B14/04H04L1/00H04M1/00
CPCG10L19/005G10L19/083G10L19/08G10L19/07G10L25/90G10L2019/0012G10L19/04
Inventor A·拜尼亚斯恩E·施罗默特H-Y·苏
Owner HTC CORP
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