Abstract: A driver assistance device to assist in giving a more appropriate stimulus to a driver is obtained. The driver assistance device includes an acquisition unit to acquire temporal change information indicating a change of a driver's arousal state over time, and a stimulus determination unit to determine a stronger stimulus as a stimulus to be given to the driver as an absolute value of the change over time indicated by the temporal change information acquired by the acquisition unit is larger.

Abstract: A sound signal control device in a device including an input transducer to detect sound in a space in a vehicle, a sensor to image an occupant in the space, and an output transducer to emit sound into the space includes: a controller to generate information indicating a position of a head of the occupant and information indicating a state of the occupant, based on an image imaged by the sensor; a processor to generate a cancellation signal for cancelling noise at the position based on a sound signal representing sound detected by the input transducer and the information, and generate a control signal for controlling sound at the position based on the cancellation signal; and a converter to cause the output transducer to emit a sound corresponding to the control signal. The processor adjusts a degree to which the noise is cancelled, based on the information indicating the state.

Abstract: A sound signal control device in a device including an input transducer to detect sound in a space in a vehicle, a sensor to image an occupant in the space, and an output transducer to emit sound into the space includes: a controller to generate information indicating a position of a head of the occupant and information indicating a state of the occupant, based on an image imaged by the sensor; a processor to generate a cancellation signal for cancelling noise at the position based on a sound signal representing sound detected by the input transducer and the information, and generate a control signal for controlling sound at the position based on the cancellation signal; and a converter to cause the output transducer to emit a sound corresponding to the control signal. The processor adjusts a degree to which the noise is cancelled, based on the information indicating the state.

Abstract: An audio signal processing device 100 includes a period detecting unit 102 for detecting the fundamental period of an input audio signal 101; a square wave generating unit 106 for generating, according to the fundamental period the period detecting unit 102 detects, a square wave 107 whose period is an integer multiple of the fundamental period; an amplitude correction coefficient generating unit 103 for calculating an amplitude correction coefficient 109 approximately equal and proportional to the intensity of the input audio signal 101; a first multiplier 108 for generating an amplitude-corrected square wave 110 by multiplying the square wave 107 by the amplitude correction coefficient 109; and an adder 104 for adding the amplitude-corrected square wave 110 to the input audio signal 101.

Abstract: An echo canceler includes a signal-to-echo ratio calculating unit 103 and a residual echo suppressing unit 105. The signal-to-echo ratio calculating unit 103 computes a signal-to-echo ratio SE(n) indicating a ratio of an echo component to a received signal x(n) from a first residual signal and a second residual signal. The first residual signal is obtained using a filter coefficient sequence of an update filter 102, which is obtained up to the previous operation. The second residual signal is obtained using an updated filter coefficient sequence that undergoes a coefficient update which is performed, using an arbitrary update step size ?(n), on the filter coefficient sequence of the update filter 102, which is obtained up to the previous operation. The residual echo suppressing unit 105 suppresses the echo component contained in the microphone input signal in accordance with the signal-to-echo ratio the signal-to-echo ratio calculating unit 103 computes.

Abstract: A signal processing device is provided, including a prediction error calculating unit that calculates an error signal between a left signal l(n) and a prediction signal of the left signal l (n) predicted from a right signal r(n), a gain adjusting unit that makes a gain adjustment and outputs an error signal, a first adder that adds the left signal l(n) and the error signal and outputs, and a second adder that adds the right signal r(n) and the error signal in opposite phase and outputs.

Abstract: An echo canceler includes a signal-to-echo ratio calculating unit 103 and a residual echo suppressing unit 105. The signal-to-echo ratio calculating unit 103 computes a signal-to-echo ratio SE(n) indicating a ratio of an echo component to a received signal x(n) from a first residual signal and a second residual signal. The first residual signal is obtained using a filter coefficient sequence of an update filter 102, which is obtained up to the previous operation. The second residual signal is obtained using an updated filter coefficient sequence that undergoes a coefficient update which is performed, using an arbitrary update step size ?(n), on the filter coefficient sequence of the update filter 102, which is obtained up to the previous operation. The residual echo suppressing unit 105 suppresses the echo component contained in the microphone input signal in accordance with the signal-to-echo ratio the signal-to-echo ratio calculating unit 103 computes.

Abstract: A signal processing section 3 is set up which provides an anti-phase component signal S extracted by an anti-phase component extracting section 2 with a transfer characteristic (Hd+Hx)/(Hd?Hx); an adder 4 adds the phase-inverted signal of the anti-phase component signal S provided with the transfer characteristic by the signal processing section 3 and an in-phase component signal M extracted by an in-phase component extracting section 1; and an adder 5 adds the anti-phase component signal S provided with the transfer characteristic by the signal processing section 3 and the in-phase component signal M extracted by the in-phase component extracting section 1.

Abstract: A prediction error calculating unit 13 calculates an error signal 103 between a left signal l(n) 101 and a prediction signal of the left signal l(n) 101 predicted from a right signal r(n) 102, a gain adjusting unit 17 makes a gain adjustment and outputs an error signal 107, a first adder 14 adds the left signal l(n) 101 and the error signal 107 and outputs, and a second adder 15 adds the right signal r(n) 102 and the error signal 107 in opposite phase and outputs.

Abstract: An audio signal processing device 100 includes a period detecting unit 102 for detecting the fundamental period of an input audio signal 101; a square wave generating unit 106 for generating, according to the fundamental period the period detecting unit 102 detects, a square wave 107 whose period is an integer multiple of the fundamental period; an amplitude correction coefficient generating unit 103 for calculating an amplitude correction coefficient 109 approximately equal and proportional to the intensity of the input audio signal 101; a first multiplier 108 for generating an amplitude-corrected square wave 110 by multiplying the square wave 107 by the amplitude correction coefficient 109; and an adder 104 for adding the amplitude-corrected square wave 110 to the input audio signal 101.

Abstract: A signal processing section 3 is set up which provides an anti-phase component signal S extracted by an anti-phase component extracting section 2 with a transfer characteristic (Hd+Hx)/(Hd?Hx); an adder 4 adds the phase-inverted signal of the anti-phase component signal S provided with the transfer characteristic by the signal processing section 3 and an in-phase component signal M extracted by an in-phase component extracting section 1; and an adder 5 adds the anti-phase component signal S provided with the transfer characteristic by the signal processing section 3 and the in-phase component signal M extracted by the in-phase component extracting section 1.

Abstract: To date, there has been no speaker-characteristic compensation method including a processing step of reducing crosstalk between speakers incorporated in a mobile terminal. Accordingly, it has been impossible to reduce crosstalk that, in a mobile terminal, occurs between speakers. A speaker-characteristic compensation method, for a mobile terminal device having at least two speakers in a case, according to the present invention includes steps of reducing mutual crosstalk between the speakers, thereby reducing crosstalk between the speakers.

Abstract: Up to now, there have existed filters having a transfer function for canceling crosstalk components arriving from loudspeakers, at the listener's right/left ear, however, such filters have been incapable of properly reducing the inter-loudspeaker crosstalk components inside the casing of a mobile terminal. Therefore, when input signals are expected to produce stereophonic effects, three-dimensional sound image localization has not been realized in mobile terminals.

Abstract: To date, there has been no speaker-characteristic compensation method including a processing step of reducing crosstalk between speakers incorporated in a mobile terminal. Accordingly, it has been impossible to reduce crosstalk that, in a mobile terminal, occurs between speakers. A speaker-characteristic compensation method, for a mobile terminal device having at least two speakers in a case, according to the present invention includes steps of reducing mutual crosstalk between the speakers, thereby reducing crosstalk between the speakers.

Abstract: A communication equipment unit producing an incoming call alert sound includes: main incoming call alert signal output means for outputting a main incoming call alert signal for sounding a main incoming call alert sound; advance incoming call alert signal output means for outputting an advance incoming call alert signal for sounding an advance incoming call alert sound; scheduling means for allowing the main incoming call alert signal output means and the advance incoming call alert signal output means to operate so that the main incoming call alert sound is produced after a predetermined period of time elapses since the advance incoming call alert sound is produced; and sound production means reducing the incoming call alert sound based on the main incoming call alert signal and the advance incoming call alert signal.

Abstract: A portable acoustic apparatus includes a sound outlet (3) formed in the front wall (61) of a housing (6); an acoustic converting element (1) fixed in the housing in such a manner that a front chamber (2) is formed between the acoustic converting element and the front wall (61), and a back chamber (4) is formed between the acoustic converting element and the back wall (62) of the housing (6); and a duct (5) that is formed in the front wall (61) around the sound outlet (3) and communicates to the outside of the housing. The minimum inner width W of the outer casing (63) of the housing (6) is made equal to or less than the standard diameter of the human concha.

Abstract: A mobile phone terminal includes a transmitting side speech signal path switch and receiving side speech signal path switch, and a general purpose USB port. The signal path switches are interposed between a speech coder/decoder and an A/D converter and D/A converter to enable a terminal acoustic evaluation signal to be input and output through a path different from that in a normal operation mode of the mobile phone terminal. The general purpose USB port is used for connecting the signal path switches with an external terminal unit so that the control signals of the signal path switches and a terminal acoustic test signal are transferred across these signal path switches and the general purpose USB port. The mobile phone terminal can mount the external connection port for the acoustic evaluation test more efficiently.

Abstract: An echo canceller has a high-pass filter 11, a speaker 3, an A/D converter 6, and an echo canceller 7. The high-pass filter 11 suppresses a low-frequency component in a received signal. The speaker 3 outputs an acoustic sound of a low-frequency suppressed received signal passed through the high-pass filter 11. The A/D converter 6 converts an acoustic echo from a microphone 4 into a transmission signal of a digital form. The echo canceller 7 generates a pseudo echo signal based on the low-frequency suppressed received signal passed through the high-pass filter 11, and eliminates the acoustic echo to be inputted to the microphone 4 from the speaker 3 by subtracting the pseudo echo signal from the digital signal converted by the A/D converter 6.

Abstract: A speech decoding unit estimates coding parameters of a speech pause by carrying out smoothing algorithm of the coding parameters by using a coding parameter xref constituting far-end talker background noise information extracted by a parameter extracting circuit 12, and a coding parameter xn used for synthesizing the previous background noise.

Abstract: An echo canceller has a high-pass filter 11, a speaker 3, an A/D converter 6, and an echo canceller 7. The high-pass filter 11 suppresses a low-frequency component in a received signal. The speaker 3 outputs an acoustic sound of a low-frequency suppressed received signal passed through the high-pass filter 11. The A/D converter 6 converts an acoustic echo from a microphone 4 into a transmission signal of a digital form. The echo canceller 7 generates a pseudo echo signal based on the low-frequency suppressed received signal passed through the high-pass filter 11, and eliminates the acoustic echo to be inputted to the microphone 4 from the speaker 3 by subtracting the pseudo echo signal from the digital signal converted by the A/D converter 6.