Jvc Kenwood Corporation

Jvc Kenwoord Corporation

Keisuke Oda

Takaaki Yamabe

A frame signal generator is configured to generate a frame signal with a predetermined first time length from an input signal. A reference signal generator is configured to generate a reference signal from a signal located more in a past than a position of the frame signal in the input signal. A correlation value calculator is configured to calculate a correlation value between the frame signal and the reference signal within a range of a predetermined phase shift amount m. A periodic noise determiner is configured to determine whether or not the frame signal includes periodic noise, and calculate a period of the periodic noise in the case where the frame signal includes the periodic noise. A correlation value calculation range generator is configured to generate the range of the predetermined phase shift amount based on the period of the periodic noise.

Noise detection device, noise detection method, and noise detection program

A frame generatorframes an input signal and generates a frame signal. A reference signal storage unitstores therein a reference signal showing a periodic noise signal. A correlation value calculatorcalculates a correlation value between the frame signal and the reference signal. A correlation candidate position deciderdecides a plurality of correlation candidate positions serving as candidates for a signal portion of the reference signal correlated with the frame signal. A noise reduction processorreduces a periodic noise signal, which is included in the frame signal, by using each signal portion of the plurality of correlation candidate positions, and generates a plurality of candidate output signals. An output signal deciderdecides a candidate output signal, in which the periodic noise signal is reduced the most among the plurality of candidate output signals, and outputs the decided output signal.

Noise reduction device, noise reduction method, and noise reduction program

Provided is a noise reduction apparatus, a noise reduction method, and a program for generating voice that is easy to hear while reducing sudden sound. The noise reduction apparatus includes a first microphone configured to collect mainly voice and output the voice as a first signal, a second microphone configured to collect mainly sound other than the voice and output the sound as a second signal, a sudden sound detecting unit configured to detect sudden sound in the first signal and the second signal, a sudden sound information storage unit configured to store the sudden sound as one or a plurality of reference signals, and an adder configured to remove the sudden sound from the first signal based on the reference signal stored in the sudden sound information storage unit.

Noise reduction apparatus, noise reduction method, and program

A noise reduction apparatus according to the present invention includes: a sudden sound information storage unit that stores an input signal that are input before a current input signal is input as sudden sound information, the input signal having a signal level of voice components equal to or smaller than a predetermined threshold and including a sudden sound to be suppressed; a phase difference calculation unit that calculates a phase difference between the sudden sound information and a sudden sound in the current input signal based on a maximum value of a correlation value between the sudden sound information and the current input signal; an addition signal generation unit that shifts a phase of the sudden sound information based on the phase difference to generate an addition signal; and a sudden sound suppression unit that adds the addition signal and the current input signal to output an output signal.

Noise reduction apparatus, noise reduction method, and noise reduction program

A noise elimination device according to the present invention includes a signal separation unit that divides input frequency information generated from an input signal on a time-domain into suppression target band information including a cyclic noise as the main component and intended sound band information including intended sound band information as the main component, a first frequency reverse-conversion unit that converts the suppression target band information into time-domain information and thereby outputs a suppression target signal, a second frequency reverse-conversion unit that converts the intended sound band information into time-domain information and thereby outputs an intended sound signal, and a cyclic noise information storage unit that accumulates the suppression target signal and thereby stores noise history information including information corresponding to at least one cycle of the cyclic noise.

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Yokohama, Japan

Keisuke Oda