Signal processing apparatus, signal processing method, and program

A signal processing method executed in a signal processing apparatus, the method comprising the steps of:

• causing a source separation module to produce respective separation signals corresponding to a plurality of sound sources by applying an ICA (Independent Component Analysis) to observation signals produced based on mixture signals from the sound sources, which are taken by source separation microphones, to thereby execute a separation process of the mixture signals;
• and
• causing a signal projection-back module to receive observation signals of projection-back target microphones and the separation signals produced by the source separation module, and to produce projection-back signals as respective separation signals corresponding to the sound sources, which are to be taken by the projection-back target microphones,
• wherein the projection-back signals are produced by receiving the observation signals of the projection-back target microphones which differ from the source separation microphones.

A non-transitory computer readable recording medium having stored thereon a program for executing signal processing in a signal processing apparatus, the program comprising the steps of:

• causing a source separation module to produce respective separation signals corresponding to a plurality of sound sources by applying an ICA (Independent Component Analysis) to observation signals produced based on mixture signals from the sound sources, which are taken by source separation microphones, to thereby execute a separation process of the mixture signals;
• and
• causing a signal projection-back module to receive observation signals of projection-back target microphones and the separation signals produced by the source separation module, and to produce projection-back signals as respective separation signals corresponding to the sound sources, which are to be taken by the projection-back target microphones,
• wherein the projection-back signals are produced by receiving the observation signals of the projection-back target microphones which differ from the source separation microphones.