Analog radio communicator with fade compensation

Details Analog radio communicator with fade compensation Analog radio communicator with fade compensation

H - Electricity

04

B

H04B 7/005 (2006.01) H04B 1/40 (2006.01) H04B 7/00 (2006.01)

Patent

CA 2131136

- 9 - Abstract An analog radio voice communicator includes a speech encoding system that acts in series with normal analog speech processing. Normal corrupted speech is encoded during operation of the radio voice communicator. The signal strength of the incoming speech signal is monitored. During fades when the signal strength is below a threshold value a fade is recognized and the resultant noise signal remaining is ignored by the speech encoding system. A decoder is included in the communicator and operates in cooperation with the encoder and responds to the fade and for the interval of the fade substitutes reconstructed speech in place of the noise signal. Reconstruction is based on the most likely characteristics of the voice signal wave form to follow the previous actual voice signal. This arrangement uses the filter coefficients generated by linear predictive coding techniques and the excitation vectors developed by excitation analysis to reconstruct the expected speech signal in a synthesis filter.

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