Abstract: A signal processing apparatus includes: clip detector means that detects presence/absence of a clipped part with a deformed waveform in each of N audio signals output from N microphones (where N is an integer equal to or greater than 2) based on a dynamic range of a circuit; and interpolation means that treats an audio signal in the N audio signals which has the clipped part detected by the clip detector means as an interpolation target, and other audio signals as non-interpolation targets, and interpolates the waveform of the clipped part of the interpolation target using the waveform of at least one audio signal in the non-interpolation targets.

Abstract: A signal processing apparatus includes: clip detector means that detects presence/absence of a clipped part with a deformed waveform in each of N audio signals output from N microphones (where N is an integer equal to or greater than 2) based on a dynamic range of a circuit; and interpolation means that treats an audio signal in the N audio signals which has the clipped part detected by the clip detector means as an interpolation target, and other audio signals as non-interpolation targets, and interpolates the waveform of the clipped part of the interpolation target using the waveform of at least one audio signal in the non-interpolation targets.

Abstract: A signal processing device includes: a frequency conversion processing unit that sets, as a processing target signal, a section in which a peak signal level exceeds a first threshold in an input sound signal and applies frequency conversion processing to the processing target signal to acquire power levels in respective plural bands; and an amplitude compressing unit that executes, when a power level exceeding a second threshold is present among the power levels in the respective plural bands acquired by the frequency conversion processing unit, amplitude compression processing for compressing a signal level of the processing target signal at a compression ratio at which the peak signal level of the processing target signal falls within the first threshold and, otherwise, prohibits the execution of the amplitude compression processing.