Method and apparatus for transmitting control information...

Details Method and apparatus for transmitting control information... Method and apparatus for transmitting control information...

H - Electricity

04

L

H04L 5/00 (2006.01) H04J 3/02 (2006.01) H04J 3/12 (2006.01) H04L 12/16 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2301340

The invention relates to a method and apparatus for transmitting control information over an audio data stream, such as PCM coded speech information. The device comprises a control unit having two inputs receiving the PCM speech samples and control information signal. Each PCM sample is made up of a plurality of bits arranged according to different significance positions, such as position 0, 1, 2, 3, ...N, where N+1 is the number of bits in the sample. The control unit receives a selected sample and shifts a bit at a selected significance position to a lower significance position. The empty slot at the predetermined significance position is used to receive a bit from the control information signal. The compound signal thus obtained is then released over a transport path, such as a T1 link, for transmission to a remote location. At the receiver, the control information bit is extracted from the selected sample at the predetermined significance position, and the PCM speech sample is recovered by shifting upwardly at least one bit at a significance position lower than the selected significance position.

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