WAVEFORM SIGNAL GENERATION SYSTEM, WAVEFORM SIGNAL GENERATION METHOD AND PROGRAM
A waveform signal generation system includes: a neural network function unit configured to generate a target waveform signal from an intermediate representation signal by changing a time component or a feature component of the intermediate representation signal indicating an intermediate representation between an input signal and the target waveform signal using a neural network function; and a non-neural network function unit configured to act for at least a part of processing for generating the target waveform signal from the intermediate representation signal using a non-neural network function indicating a relationship between the time component and the feature component of the intermediate representation signal. The neural network function unit upsamples a time component of the intermediate representation signal using the neural network function.
1 . A waveform signal generation system comprising:
a neural network configured to generate a target waveform signal from an intermediate representation signal by changing a time component or a feature component of the intermediate representation signal indicating an intermediate representation between an input signal and the target waveform signal using a neural network function; and
a non-neural network configured to act for at least a part of processing for generating the target waveform signal from the intermediate representation signal using a non-neural network function indicating a relationship between the time component and the feature component of the intermediate representation signal.
2 . The waveform signal generation system according to claim 1 , wherein the neural network performs upsampling of a time component of the intermediate representation signal using the neural network function.
3 . The waveform signal generation system according to claim 1 , wherein the neural network is a convolutional neural network.
4 . The waveform signal generation system according to claim 1 , wherein the non-neural network generates the target waveform signal from the intermediate representation signal of which the time component is changed by the neural network.
5 . The waveform signal generation system according to claim 1 , wherein the non-neural network performs frequency-time transformation based on an inverse short-time Fourier transform, an inverse wavelet transform, or a predetermined basis function on the intermediate representation signal.
6 . A waveform signal generation method executed by a waveform signal generation system, the method comprising:
generating a target waveform signal from an intermediate representation signal by changing a time component or a feature component of the intermediate representation signal indicating an intermediate representation between an input signal and the target waveform signal using a neural network function; and
acting for at least a part of processing for generating the target waveform signal from the intermediate representation signal using a non-neural network function indicating a relationship between the time component and the feature component of the intermediate representation signal.
7 . A non-transitory computer readable medium which stores a program causing a computer to function as the waveform signal generation system according to claim 1 .