Audio processing apparatus with noise reduction and method of controlling the audio processing apparatus

摘要

An audio processing apparatus includes first and second audio pickup units. The second audio pickup unit includes an audio resistor provided to cover a sound receiving portion to suppress external wind introduction while passing an external audio. A first filter attenuates a signal having a frequency lower than a first cutoff frequency of the output signal of a first A/D converter. A second filter attenuates a signal having a frequency higher than a second cutoff frequency of the output signal of a second A/D converter. A third filter is provided between the first audio pickup unit and the first A/D converter to attenuate a signal having a frequency lower than a third cutoff frequency for suppressing the wind noise.

主权项

1. An audio processing apparatus comprising:
a first audio pickup unit; a second audio pickup unit including an audio resistor provided to cover a sound receiving portion to suppress external wind introduction while passing an external audio; a first A/D converter that digitizes an output signal from said first audio pickup unit; a second A/D converter that digitizes an output signal from said second audio pickup unit; a level controller that controls at least one of a signal level of an output signal of said first A/D converter and a signal level of an output signal of said second A/D converter; a first filter that attenuates a signal having a frequency lower than a first cutoff frequency of the output signal of said first A/D converter; a third filter that attenuates a signal having a frequency higher than a second cutoff frequency of the output signal of said second A/D converter; an adder that adds an output signal of said first filter and an output signal of said third filter to output an audio with reduced wind noise; and a second filter provided between said first audio pickup unit and said first A/D converter to attenuate a signal having a frequency lower than a third cutoff frequency for suppressing the wind noise, wherein the audio resistor suppresses the wind noise and acts as a structural low-pass filter for an audio other than the wind noise, and the first cutoff frequency is lower than a cutoff frequency of the structural low-pass filter.