Non-voice signal repeater for speech coders

Details Non-voice signal repeater for speech coders Non-voice signal repeater for speech coders

2005-03-15

2005-03-15

Isen, Forester W. (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal receiver

C379S379000, C379S380000, C379S381000, C379S382000, C379S383000

Reexamination Certificate

active

06868156

ABSTRACT:
A method of repeating a non-voice signal such as a dual tone, multiple frequency (DTMF) signal, by inserting a delay sequence of data values into an output data sequence of data values, a portion of the output data sequence following the delay sequence being the same as a corresponding portion of an input sequence of decoded data obtained from a low bit-rate speech decoder. The input sequence has at least one distorted non-voice sequence. The method provides for inserting a substantially undistorted non-voice sequence into the output sequence, the undistorted sequence being at least of substantially the same length as the distorted sequence, a portion of the output sequence following the undistorted sequence being the same as a corresponding portion of the input sequence, and the output sequence being substantially free of the distorted non-voice signal.

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Chapter 6, Signalling Requirements, EIA/TIA-464B, pp. 140-146.

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