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(11) | EP 0 402 947 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Arrangement and method for encoding speech signal using regular pulse excitation scheme |
| (57) A pre-processing circuit is provided to receive a discrete-time speech signal which
are then divided into a plurality of frames. A parameter extracting circuit is coupled
to a pre-processing circuit to which a discrete-time speech signal is applied and
extracts a plurality of parameters therefrom. A impulse response calculating circuit
is coupled to receive the plurality of parameters from the parameter extracting circuit,
and generates an impulse response function signal using the plurality of parameters.
An autocorrelation function circuit is coupled to receive the impulse response signal
and generates an autocorrelation function signal using the signal applied. A cross-correlation
function signal generates a cross-correlation function signal using the discrete-time
speech signal and the autocorrelation function signal. A grid signal generator receive
the output of the cross-correlation function calculating circuit, and outputs a grid
signal indicative of a location of a first excitation pulse within one frame. A pulse
amplitude calculating circuit receives the autocorrelation function signal, the cross-correlation
function signal and the grid signal, and determines an amplitude sequence of excitation
pulses within one frame. |