オーディオ信号処理装置およびオーディオ情報データ・フレーム処理方法

Japanese Patent JP3542610

B2

In recent years, the telecommunications industry has witnessed the proliferation of a variety of digital vocoders in order to meet bandwidth demands of different wireline and wireless communication systems. The rapid growth in the diversity of networks and the number of users of such networks is increasing the number of instances where two vocoders are placed in tandem to serve a single connection. Such arrangements of low bit-rate codecs can degrade the quality of the transmitted speech. To overcome this problem the invention provides a novel method and an apparatus for transmitting digitized voice signals in the wireless communications environment. The apparatus is capable of converting a compressed speech signal from one format to another format via an intermediate common format, thus avoiding the necessity to successively de-compress voice data to a PCM type digitization and then recompress the voice data.

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Marmelstein Paul
Rabipoor Rafi
Navarro William
Coverdale pole

JP50516299A

July 14, 2004

November 05, 1997

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NORTEL NETWORKS LIMITED

G10L19/06; G10L19/00; H03M7/30; H04W88/18; (IPC1-7): H03M7/30; G10L19/02

JP6319167A
JP8288921A
JP8254998A
JP8248998A

Kazuto Izumi

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