Patent ID: 8484039
Filing Date: 2013-07-09
Classification: G10L

Abstract:
1. A voice mixing apparatus for carrying out mixing on encoded narrowband voice data sent from N narrowband terminals, where N is a natural number, and encoded wideband voice data of layered structure that are sent from M wideband terminals, M is a natural number, the encoded wideband voice data including first encoded voice data for a narrowband region and second encoded voice data for a region outside a narrowband, said apparatus comprising: a first narrowband decoder that decodes the input encoded narrowband voice data to thereby produce N narrowband voice signals; a first wideband decoder that splits the input encoded wideband voice data into the first encoded voice data and the second encoded voice data, and decodes the first encoded voice data to thereby produce M narrowband voice signals; a maximum narrowband voice signal detector that detects a first signal highest in level among N+M narrowband voice signals including the N narrowband voice signals and the M narrowband voice signals; a first selector that expands, when the first signal is detected among the N narrowband voice signals, the first signal into a wideband voice signal and then encodes a signal of a region outside the narrowband of the expanded wideband voice signal to output the encoded signal, and outputs, when the first signal is detected among the M narrowband voice signals, the first encoded voice data and the second encoded voice data; a first mixer that mixes the narrowband voice signal obtained through decoding by said first narrowband decoder with the narrowband voice signal obtained through decoding by said first wideband decoder to thereby produce a second signal; a first narrowband encoder that encodes the second signal when a destination terminal is compatible with the encoded narrowband voice data; and a first wideband encoder that encodes, when the destination terminal is compatible with the encoded wideband voice data, the narrowband region of the second signal to thereby produce first encoded voice data, and combining the first encoded voice data produced with the second encoded voice data output from said first selector to thereby form the encoded wideband voice data of layered structure.