Speech encoder

Details Speech encoder Speech encoder

1993-08-30

1995-09-05

MacDonald, Allen R.

G10L 900

Patent

active

054486831

ABSTRACT:
A speech encoder circuit of a waveform coding system. An analog speech input signal having coded data therein is received by a buffer and split into two branches. In a first branch the input signal is applied to a subtractor of an adaptive predictor to obtain a predicted residual signal subjected to an orthogonal transformation in a discrete cosine transform unit to convert the residual signal into a frequency domain of each of the frames of the individual blocks. An adaptive encoder in the first branch quantizes the frequency domain frame and branches its digital coded output to a branch for output to a transmission line and to a decoding branch. In the second branch of the split input signal a first sample delay element delays the split input signal for a given number of samples and a first attenuator in the second branch delays the output of the first sample delay element a given amount of each frame received for application to the subtractor for obtaining the predicted residual signal. The coded signal in the decoding branch is applied to an adaptive decoder whose decoded output is subjected to an inverse orthogonal transformation by an inverse discrete cosine transform unit to obtain a signal applied to an input of an adder and delayed by a second delay element and attenuated by a second attenuator in the decoding branch with which processing of one frame ends. The outputs of the attenuators are applied to the subtractor for development of the predicted residual signal.

REFERENCES:
patent: 4518950 (1985-05-01), Petr
patent: 4626828 (1986-12-01), Nishitani
patent: 5012517 (1991-04-01), Wilson et al.
patent: 5089818 (1992-02-01), Mahieux et al.
patent: 5093863 (1992-03-01), Galand et al.
patent: 5206884 (1993-04-01), Bhaskar

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