Abstract: To provide an audio signal processing apparatus, an audio signal processing system, and an audio signal processing method that include: a first converting part that converts an input data sequence of an audio signal into frequency data using an IIR system DFT at each processing timing, a window processing part that performs window processing on the frequency data using a window function, a signal processing part that performs predetermined signal processing on the frequency data on which window processing has been performed, and a second converting part that converts the frequency data, on which the signal processing has been performed, into a time-axis data sequence.

Abstract: A transmitting apparatus, a receiving apparatus corresponding to the transmitting apparatus, and a transmitting-receiving system including: a first A/D converting part that converts an analog audio signal into a digital signal; a compressing part that compresses the converted digital signal; a modulating part that generates a modulated signal by modulating the compressed digital signal; an all-pass filter that reduces a phase distortion included in the modulated signal; and a transmitting part that transmits a phase-distortion-cancelled signal resulting from reducing the phase distortion of the modulated signal with the all-pass filter are provided.

Abstract: A transmitting apparatus, a receiving apparatus corresponding to the transmitting apparatus, and a transmitting-receiving system including: a first A/D converting part that converts an analog audio signal into a digital signal; a compressing part that compresses the converted digital signal; a modulating part that generates a modulated signal by modulating the compressed digital signal; an all-pass filter that reduces a phase distortion included in the modulated signal; and a transmitting part that transmits a phase-distortion-cancelled signal resulting from reducing the phase distortion of the modulated signal with the all-pass filter are provided.

Abstract: A digital filter, an audio signal processing system, and a method of designing a digital filter are provided, where the digital filter reduces a DC component of a signal which corresponds to an input data sequence, and has a transfer function H(s) represented as H ? ( s ) = s 2 + ? 0 Q ? s s 2 + ? 0 Q ? s + ? 0 2 where a cutoff frequency F0 is ?0/2? and a Q factor is Q.

Abstract: To provide an audio signal processing apparatus, an audio signal processing system, and an audio signal processing method that include: a first converting part that converts an input data sequence of an audio signal into frequency data using an IIR system DFT at each processing timing, a window processing part that performs window processing on the frequency data using a window function, a signal processing part that performs predetermined signal processing on the frequency data on which window processing has been performed, and a second converting part that converts the frequency data, on which the signal processing has been performed, into a time-axis data sequence.

Abstract: It is possible to shorten a delay time from utterance to output from a speaker even in a conference audio system including an automatic mute release device. An A/D converter that converts audio signals from a plurality of microphones into digital signals, an audio level detector that detects utterance or silence depending on the level of the converted digital signal, an audio data storage unit that temporarily stores the digital signal for which the audio level detector detected utterance, a controller that controls the storage of audio data in the audio data storage unit and the reading of the audio data, and a D/A converter that converts the read audio data into analog audio signals are provided. The controller hastens read timing of the audio data in accordance with a time period of silent portion when the audio level detector detects silence in a series of the audio data.

Abstract: Even in a conference audio system having an automatic mute release device, it is possible to reduce a delay time from an utterance to output from a speaker. The system includes: an A/D converter (33) for converting an audio signal from a plurality of microphones into a digital signal; audio level detection means to detect whether the converted digital signal level indicates an utterance or no sound; audio data storage means (32) for temporarily storing the digital signal in which the audio level detection means has detected an utterance; control means (31) for controlling storage of the audio data into the audio data storage means (32) and read out of the audio data; and a D/A converter (34) for converting the read-out audio data into an analog audio signal. When the audio level detection means has detected no sound in the series of audio data, the control means (31) hastens the audio data read-out timing in correspondence to the time of the no sound portion.