Provided is a signal processing device including: a reverberation sound signal generation unit that generates a reverberation sound signal according to a sound source position of a virtual sound source and a distance to a reference point; and a drive signal generation unit that generates a drive signal for a speaker array by a wavefront synthesis filter, in which the drive signal generation unit generates the drive signal on the basis of a signal obtained by performing wavefront synthesis filtering processing on a signal obtained by convolving the reverberation sound signal with a signal of the virtual sound source and/or a signal obtained by performing wavefront synthesis filtering processing on the reverberation sound signal to make the reverberation sound signal into a virtual sound source.

Provided is a signal processing device including: a reverberation sound signal generation unit that generates a reverberation sound signal according to a sound source position of a virtual sound source and a distance to a reference point; and a drive signal generation unit that generates a drive signal for a speaker array by a wavefront synthesis filter, in which the drive signal generation unit generates the drive signal on the basis of a signal obtained by performing wavefront synthesis filtering processing on a signal obtained by convolving the reverberation sound signal with a signal of the virtual sound source and/or a signal obtained by performing wavefront synthesis filtering processing on the reverberation sound signal to make the reverberation sound signal into a virtual sound source.

An audio content distribution system includes a server device and a user terminal. The server device includes an audio-data acquisition unit that acquires audio data from a distribution source, an audio-content-data generation unit that adds, to the audio data, acoustic-effect setting information indicating whether to add echo and/or attenuation of sound in a virtual reality space, and generates audio content data, and an audio-content-data distribution unit that distributes the audio content data to a user terminal of a user who operates an avatar in the virtual reality space. The user terminal includes an audio-content-data receiving unit that receives the audio content data from the server device, and an audio-data output-control unit that outputs the audio data stored in the audio content data with an acoustic effect according to the acoustic-effect setting information.

An acoustic feedback control adaptive method, the input signal being a function of a captured signal and an estimation of an acoustic feedback, the method including the following steps: —determining an impulse response (RI) of a filter (A) according to a partition of time blocks (b.sub.0, . . . b.sub.i, . . . , b.sub.Nb), according to the following steps of: —for each sub-block (h.sub.1,i, h.sub.2,i, . . . h.sub.j,i, . . . h.sub.Ni,i) of each block of the impulse response (RI), calculating a frequency transform (F.sub.1,i, F.sub.2,i, . . . F.sub.j,i, . . . F.sub.Ni,i); —repeating the following steps of: —applying the filter (A) to the output signal (u) using the frequency transform (F.sub.1,i, F.sub.2,i, . . . F.sub.j,i, . . . F.sub.Ni,i) of each sub-block (h.sub.1,i, h.sub.2,i, . . . h.sub.j,i, . . . h.sub.Ni,i); —updating the frequency transform (F.sub.1,i, F.sub.2,i, . . . F.sub.j,i, . . . F.sub.Ni,i) of each sub-block (h.sub.1,i, h.sub.2,i, . . . h.sub.j,i, . . . h.sub.Ni,i) as a function of the output signal and the input signal based on the same partition as that used in the step of applying the filter (A).

An acoustic feedback control adaptive method, the input signal being a function of a captured signal and an estimation of an acoustic feedback, the method including the following steps: —determining an impulse response (RI) of a filter (A) according to a partition of time blocks (b.sub.0, . . . b.sub.i, . . . , b.sub.Nb), according to the following steps of: —for each sub-block (h.sub.1,i, h.sub.2,i, . . . h.sub.j,i, . . . h.sub.Ni,i) of each block of the impulse response (RI), calculating a frequency transform (F.sub.1,i, F.sub.2,i, . . . F.sub.j,i, . . . F.sub.Ni,i); —repeating the following steps of: —applying the filter (A) to the output signal (u) using the frequency transform (F.sub.1,i, F.sub.2,i, . . . F.sub.j,i, . . . F.sub.Ni,i) of each sub-block (h.sub.1,i, h.sub.2,i, . . . h.sub.j,i, . . . h.sub.Ni,i); —updating the frequency transform (F.sub.1,i, F.sub.2,i, . . . F.sub.j,i, . . . F.sub.Ni,i) of each sub-block (h.sub.1,i, h.sub.2,i, . . . h.sub.j,i, . . . h.sub.Ni,i) as a function of the output signal and the input signal based on the same partition as that used in the step of applying the filter (A).

An effect addition device includes at least one processor that executes a time domain convolution process of convolving a first time domain data part of impulse response of sound effects with a time domain data on an original sound, a frequency domain convolution process of convoluting a second time domain data part of the impulse response data with the time domain data on the original sound, a convolution extension process of extending a convolved state(s) of an output signal(s) resulting from the time domain convolution process and/or the frequency domain convolution process by arithmetic processing which corresponds to an all-pass filter and/or arithmetic processing which corresponds to a comb filter, and a synthesized sound effect addition process of adding a sound effect which is synthesized by execution of the time domain convolution process, the frequency domain convolution process and the convolution extension process to the original sound.

An effect addition device includes at least one processor that executes a time domain convolution process of convolving a first time domain data part of impulse response of sound effects with a time domain data on an original sound, a frequency domain convolution process of convoluting a second time domain data part of the impulse response data with the time domain data on the original sound, a convolution extension process of extending a convolved state(s) of an output signal(s) resulting from the time domain convolution process and/or the frequency domain convolution process by arithmetic processing which corresponds to an all-pass filter and/or arithmetic processing which corresponds to a comb filter, and a synthesized sound effect addition process of adding a sound effect which is synthesized by execution of the time domain convolution process, the frequency domain convolution process and the convolution extension process to the original sound.

A live data distribution method obtains first sound source information according to sound of a first sound source generated at a first location of the first venue and position information of the first sound source, and second sound source information according to a second sound source including an ambient sound generated at a second location of the first venue, as distribution data, distributes the distributed data to the second venue, and renders the distribution data and providing first sound of the first sound source having been performed with localization processing based on the position information of the first sound source, and second sound of the second sound source, at the second venue.

A live data distribution method obtains information on a sound source according to sound generated at the first venue, and information on space reverberation, as distribution data, distributes the distribution data to the second venue, and renders the distribution data and providing sound according to the distribution data at the second venue.

A live data distribution method obtains information on a sound source according to sound generated at the first venue, and information on space reverberation, as distribution data, distributes the distribution data to the second venue, and renders the distribution data and providing sound according to the distribution data at the second venue.