Abstract:
Vocoder (200) bypass is provided using a combination of out-of-band and in-band signaling. In preferred embodiments of the present invention, two signaling channels are arranged for transmission within the compressed speech. Each of the signaling channels is communicated at a preferred rate to permit fast, reliable detection of conditions indicating vocoder bypass mode of operation and to synchronize and communicate compressed speech in a vocoder bypass mode of operation.
Abstract:
Vocoder (200) bypass is provided using in-band signaling. In preferred embodiments of the present invention, three signaling channels (see the Figure) are arranged for transmission within the compressed speech. Each of the signaling channels is communicated at a preferred rate to permit fast, reliable detection of conditions indicating vocoder bypass mode of operations, to negotiate suitable vocoder type if necessary, and to synchronize and communicate compressed speech in a vocoder bypass mode of operation.