Yamaha Corporation

Hiroomi Shidoji

Takayuki Watanabe

Dai Hashimoto

Kenichi Tamiya

Ryotaro Aoki

Kenji Ishizuka

Noriyuki Ohashii

A method for controlling a frequency response having a bell-shaped amplitude characteristic of a filter that is configured to process an audio signal includes preparing a high-frequency parameter related to a high-frequency side characteristic on a high-frequency side of the frequency response, and a low-frequency parameter related to a low-frequency side characteristic on a low-frequency side of the frequency response, independently changing the high-frequency parameter or the low-frequency parameter in accordance with a first change instruction, changing both of the high-frequency parameter and the low-frequency parameter in conjunction with each other in accordance with a second change instruction, and controlling a slope on the high-frequency side and a slope on the low-frequency side of the bell-shaped amplitude characteristic of the frequency response, by using the high-frequency parameter and the low-frequency parameter.

Control method, control device, and storage medium

An audio signal processing method includes dividing a virtual sound source representing a reflected sound of a target acoustic space into (i) a first virtual sound source located between a position of a speaker and a position of a sound receiving point, the first virtual sound source representing a first sound source of the reflected sound of the target acoustic space, and (ii) a second virtual sound source located such that the speaker is disposed between the second virtual sound source and the sound receiving point, the second virtual sound source representing a second sound source of the reflected sound of the target acoustic space, and, only in a case of the first virtual sound source, moving a position of the first virtual sound source to a reproducible position based on a position of the speaker.

Audio signal processing method, audio signal processing apparatus and a non-transitory computer-readable storage medium storing a program

A sound field support method for an audio reproducing apparatus for simulating sound emitting from a sound source, the method includes selecting either position information on the sound source to be set in a virtual space or localization information of the sound source, in a case where sound from the sound source is to be simulated sound emitted from a speaker to be set in a target space, generating a first sound signal based on the position information in a state where the selecting has selected the position information, generating a second sound signal based on the localization information in a state where the selecting has selected the localization information, and adjusting sound image localization of an input audio signal from the sound source to be output to the speaker using the first sound signal and the second sound signal.

Sound field support method, sound field support apparatus and a non-transitory computer-readable storage medium storing a program

An audio signal processing method detects a position, in a sound space, of a sound source that generates an audio signal, the sound space being divisible into a plurality of areas, and generates an initial reflected sound control signal by convolving (i) an impulse response of an initial reflected sound linked to a first area of the sound space, among the plurality of areas of the sound space, corresponding to the detected position of the sound source to (ii) the audio signal of the sound source without convolving (iii) an impulse response of an initial reflected sound linked to any of the plurality of areas of the sound space other than the first area of the sound space corresponding to the detected position of the sound source to (ii) the audio signal of the sound source.

A method for controlling an FIR filter that processes sound signals based on setting of a band filter includes receiving, from a user, an instruction for control data that indicate a gain parameter of an amplitude characteristic corresponding to a transfer function represented as a function of angular frequency, generating a first amplitude characteristic that is an amplitude characteristic of the band filter, as a basis of an amplitude characteristic of the FIR filter, in accordance with the control data, receiving an instruction for a gain limit value from the user, limiting a gain curve of the first amplitude characteristic so as to be within the gain limit value that has been instructed, thereby acquiring a second amplitude characteristic, and setting filter coefficients of the FIR filter based on the second amplitude characteristic.

Method and device for controlling fir filter

An audio signal processing method includes obtaining an audio signal of a sound source, performing first filter processing on the audio signal to generate an imaginary sound source of a virtual space, performing second filter processing on the audio signal to adjust a tone of the imaginary sound source, and outputting an initial reflected sound control signal generated by using the audio signal on which the first filter processing and the second filter processing have been performed, in a first case where the first filter processing is performed before the second filter processing, the first filter processing is performed on the audio signal, and the second filter processing is performed on the audio signal on which the first filter processing has been performed, and in a second case where the second filter processing is performed before the first filter processing, the second filter processing is performed on the audio signal, and the first filter processing is performed on the audio signal on which the second filter processing has been performed.

An audio signal processing method includes generating an initial reflected sound control signal according to a geometrical shape of a virtual space, generating a reverberant sound control signal using a reflected sound parameter of the virtual space, calculating timing of connection, the timing of connection being a point in time at which a volume of an initial reflected sound reproducible by the initial reflected sound control signal is a same as a volume of a reverberant sound reproducible by the reverberant sound control signal, based on the geometrical shape of the virtual space, and increasing, in a period of time before the timing of connection, a level of the reverberant sound control signal so as to cause the volume of the reverberant sound to be closer to the volume of the reverberant sound at the timing of connection.

An audio data processing device includes a mixing unit that mixes first audio data and second audio data to generate mixed audio data, a first output unit that outputs, to a first speaker, audio data not having undergone the mixing, a second output unit that outputs, to a second speaker, the mixed audio data generated by the mixing unit, a processor which is provided between a point of branching to the mixing unit and the first output unit or between the mixing unit and the second output unit and adds an acoustic effect, and a delay unit which is provided between the branching point and the first output unit or between the mixing unit and the second output unit and delays the audio data so that a relationship of timing between input, to the first speaker, of the audio data output from the first output unit and input, to the second speaker, of the audio data output from the second output unit coincides with a relationship of timing of input between the first audio data and the second audio data.

Audio data processing device and audio data processing method

The voice clarification apparatus includes a plurality of band-pass filters that respectively extract a plurality of band components, which are included in a voice band, from an input audio signal; a gain determination unit that determines a gain according to the level of a signal of a band component which is extracted by at least one band-pass filter of the plurality of band-pass filters; a level adjustment unit that adjusts the levels of signals of the plurality of band components which are extracted by the plurality of band-pass filters using the gain; and a first addition unit that adds a signal which is based on the audio signal to a signal in which the gain is adjusted by the level adjustment unit, and outputs a signal obtained through the addition.

Voice clarification apparatus

A signal processing apparatus is provided. The signal processing apparatus comprises: an inputting section for inputting audio signals on a plurality of channels; an acoustic type acquiring section which is adapted to acquire an acoustic type of an audio signal on at least one channel of the audio signals; and a process controlling section which is adapted to control a characteristic of sound-field effect applied to the audio signals based on the acquired acoustic type.

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Hamamatsu, Japan

Hiroomi Shidoji