Signal processing device

Claim 2

A signal processing device in accordance with claim 1, wherein the noise prediction means (6) predicts the noise of the signal portion using as a trigger the signal detected by said signal detection means (20).

Claim 3

A signal processing device in accordance with claim 1 or 2, wherein said signal detection means (20) comprises : cepstrum analysis means (4) for performing cepstrum analysis on the said frequency-analyzed signal; and signal detecting means (5) for detecting the signal portion utilizing said analyzed cepstrum.

Claim 4

A signal processing device in accordance with claim 3, wherein said signal detecting means (5)includes: peak detection means (51) for the peak on said analyzed cepstrum; and signal-noise detection means (52) for discriminating the signal on the basis of the detected peak information.

Claim 5

A signal processing device in accordance with claim 1, 2 or 3, wherein said noise prediction means (6) accumulates the noise information utilizing the signal detected by said signal detection means (20)

Claim 6

A signal processing device comprising: frequency analysis means (71) for analyzing the frequency of an inputted signal containing a noise; noise prediction means (72) for inputting therein said frequency-analyzed output of the frequency analysis means (71) to predict the noise component thereof; cancel means (73) for inputting therein said predicted noise of said noise prediction means (72), said frequency-analyzed output of said frequency analysis is means (71) and a cancel coefficient signal to cancel the noise component considering the cancel coefficient from said frequency-analyzed output; and signal composition means (74) for composing the canceled-output of said cancel means (73).

Claim 7

A signal processing device comprising: band division means (71) for dividing the frequency band of an inputted signal containing a noise; noise prediction means (72) for inputting therein said band-divided output of said band division means (71) to predict the noise component; cancel means (73) for inputting therein said predicted noise output of said noise prediction means (72), said band-divided output of said band division means (71) and a cancel coefficient signal to cancel said noise component considering the cancel coefficient from said band-divided output; and band composition means (74) for composing said canceled-output of the cancel means.

Claim 8

A signal processing device in accordance with claim 7, wherein said device includes: pitch frequency detection means (87) for detecting a pitch frequency of said input signal containing noise; and cancel coefficient setting means (88) for setting said cancel coefficient signal in response to said pitch frequency output of said pitch frequency detection means (87)

Claim 9

A signal processing device comprising: a noise prediction section (101) for outputting a predicted noise signal by a voice/noise signal input; a cancel section (102) for inputting therein said voice/ noise signal input and said predicted noise signal to obtain a noise-eliminated voice output; a voice detection section (103) for detecting the presence/absence of a voice signal from said noise-canceled voice signal to output a control signal corresponding to said presence/absence; and said noise prediction section (101) performing noise prediction utilizing said control signal of said voice detection section.

Claim 10

A signal processing device comprising: a first noise prediction section (104) for outputting a first predicted noise signal by a voice/noise signal input; a first cancel section (105) into which said voice/noise signal and said first predicted noise signal are inputted , to obtain a first noise-eliminated voice output; a voice detection section (106) for detecting the presence/absence of a voice signal from said noise-canceled voice signal to output a control signal corresponding to the presence/absence; said first noise prediction section (104) performing noise prediction utilizing said control signal of said voice detection section; and further said device provided with ; a second noise prediction section (107) for outputting a second predicted noise signal by said first voice output and by said control signal; a second cancel section (108) into which said first noise-eliminated output and said second predicted noise signal are inputted to obtain a second noise-eliminated voice output.

Claim 11

A signal processing device comprising: FFT processing means (121) for FFT processing a signal containing a noise; cepstrum peak detection means (122) for performing cepstrum analysis of the FFT output of said FFT processing means (121) to detect the peak thereof; pitch frequency estimate means (123) for estimating a pitch frequency in the peak-detected output of said cepstrum peak detection means (122); window generation means (124) for generating a window output on the basis of the pitch frequency predicted output in said pitch frequency estimate means (123); noise prediction means (125) for predicting a noise from the FFT output of said FFT processing means (121); cancel means (126) for canceling the predicted noise output of said noise prediction means (125) from the FFT output of said FFT processing means (121); pitch frequency emphasis means (127) for emphasizing the canceled output of said cancel means (126) by the window output of said window generation means (124); and IFFT processing means (128) for IFFT processing the emphasized output of said pitch frequency emphasis means (127).

Claim 12

A signal processing method comprising the steps of: analyzing the frequencies of an inputted signal containing noise; detecting a signal portion from said frequency-analyzed signal; predicting noise of the inputted frequency-analyzed signal portion on the basis of a past noise information; subtracting said predicted noise from said frequency-analyzed signal; and performing signal composition on said noise-cancelled signal.