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Method and system for bandwidth expansion for voice communications

A technology of bandwidth expansion and voice communication, applied in the direction of voice analysis, instruments, selection devices, etc., can solve the problems of no development, no compression, reconstruction of removed frequency components, etc.

Inactive Publication Date: 2008-06-25
MOTOROLA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, no technique has been developed to efficiently reconstruct the removed frequency components
Also, existing analog phones do not implement any compression
As such, they still suffer from similar bandwidth limitations imposed by decades-old transport standards

Method used

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  • Method and system for bandwidth expansion for voice communications
  • Method and system for bandwidth expansion for voice communications
  • Method and system for bandwidth expansion for voice communications

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Embodiment Construction

[0020] Although the specification concludes with claims defining the features of the invention which are believed to be novel, it should be understood that the invention will be better understood when considered in conjunction with the following description and accompanying drawings, in which like reference numerals continue to be used.

[0021] As required, detailed embodiments of the invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and for teaching one skilled in the art to variously employ the present invention in substantially any suitable detailed structure. representative basis. Furthermore, the terms and phrases used herein are not intended to be limiting but to provide an understandable description of ...

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Abstract

The invention concerns a method (400) and system (100) for bandwidth extension of voice for improving the quality of voice in a communication system. The method can include the steps of receiving (412) an unknown voice signal (105), identifying (414) the voice bandwidth (625) of the received unknown voice signal and establishing (418) a region of support (636) in view of the spectral content of the received voice signal. The method can further include the step of selecting (428) a combination of mapping databases (210, 212, 214) from a plurality of mapping databases. Each mapping database can be associated with a predetermined bandwidth extension range for extending the voice bandwidth.

Description

technical field [0001] The present invention relates generally to extending speech bandwidth, and more particularly to extending narrowband speech signals to wideband speech signals. Background technique [0002] The use of portable electronic devices has grown dramatically in recent years. Cellular telephony, in particular, has become quite popular with the public. The primary use of cellular phones is for voice communications. Cellular phones operate on voice signals by compressing them and sending them over a communication network. Compression reduces the amount of data required to represent a speech signal and the speech bandwidth. For example, speech bandwidth on cellular telephones is typically limited to a frequency band between 300 Hz and 3.4 kHz, however, natural speaking speech exists primarily within a bandwidth of 20 Hz to 10 KHz. The voice band limiting process is a necessary step in the efficient transmission and reception of digital signals in a cellular c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/20
CPCG10L21/038
Inventor 哈沙·M·萨廷德拉伊斯梅·乌伊萨尔约翰·G·哈里斯马克·A·布瓦洛
Owner MOTOROLA INC
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