US 9,426,570 B2 · Audio processing device and method

Abstract

An audio processing device includes a setting section that sets a reproduction sampling frequency Fplay and a recording sampling frequency Frec higher than Fplay, a digital-to-analog converter that based on Fplay converts a sound source signal that is a digital signal into a reproduction signal that is an analog signal, an analog-to-digital converter that based on Frec converts a recording signal that is an analog signal converter into an input signal that is a digital signal, a signal separator that separates the input signal into a low region signal contained in a band of less than Fplay and a high region signal contained in a band of the Fplay and higher, and a breakup detector that detects whether or not breakup is occurring in the reproduced sound based on power of the high region signal.

Claims21

Dependent claims

An audio processing device comprising:

a processor configured to execute a process, the process comprising;
setting a reproduction sampling frequency and a recording sampling frequency higher than the reproduction sampling frequency;
based on the reproduction sampling frequency, converting a sound source signal that is a digital signal into a reproduction signal that is an analogue signal;
based on the recording sampling frequency, converting a recording signal that is an analogue signal obtained by recording sound that has been reproduced according to the reproduction signal converted into an input signal that is a digital signal;
separating the input signal converted into a low region signal contained in a band of less than the reproduction sampling frequency and a high region signal contained in a band of the reproduction sampling frequency and higher;
and
detecting whether or not breakup is occurring in the reproduced sound based on power of the high region signal, or based on a difference or ratio between power of the high region signal and power of the low region signal.

4 more elements

An audio processing method comprising:

setting a reproduction sampling frequency and a recording sampling frequency higher than the reproduction sampling frequency;
based on the reproduction sampling frequency, converting a sound source signal that is a digital signal into a reproduction signal that is an analogue signal;
based on the recording sampling frequency, converting a recording signal that is an analogue signal obtained by recording sound that has been reproduced according to the converted reproduction signal into an input signal that is a digital signal;
separating the converted input signal into a low region signal contained in a band of less than the reproduction sampling frequency and a high region signal contained in a band of the reproduction sampling frequency and higher;
and
detecting whether or not breakup is occurring in the reproduced sound based on power of the high region signal, or based on a difference or ratio between power of the high region signal and power of the low region signal.

3 more elements

A non-transitory recording medium having recorded thereon an audio processing program for causing a computer to execute a process, the process comprising:

setting a reproduction sampling frequency and a recording sampling frequency higher than the reproduction sampling frequency;
based on the reproduction sampling frequency, converting a sound source signal that is a digital signal into a reproduction signal that is an analogue signal;
based on the recording sampling frequency, converting a recording signal that is an analogue signal obtained by recording sound that has been reproduced according to the converted reproduction signal into an input signal that is a digital signal;
separating the converted input signal into a low region signal contained in a band of less than the reproduction sampling frequency and a high region signal contained in a band of the reproduction sampling frequency and higher;
and
detecting whether or not breakup is occurring in the reproduced sound based on power of the high region signal, or based on a difference or ratio between power of the high region signal and power of the low region signal.

3 more elements

Dependencies are inferred from the claim text.

Audio processing device and method

Life of this patent

Audio processing device and method

Life of this patent

Abstract

Claims21