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US 5,550,925 AGranted
Sound processing device
AssigneeCanon Kabushiki Kaisha
InventorsTaizou Hori, Hideaki Fujimoto, Hirokazu Mogi, Yasumasa Ono
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Abstract
A sound processing device for processing sound is arranged to control an attenuation characteristic for attenuating the low-frequency signal of an input audio signal according to the level thereof, whereby it is possible to suppress a noise component contained in sound without substantial impairment in auditory sound quality.
Claims13
A sound processing device for processing sound, comprising:
- (A) low-frequency attenuating means for receiving an audio signal as its input, attenuating a low-frequency signal of the input audio signal and outputting a resultant audio signal;
- and
- (B) control means for controlling an attenuating characteristic in said low-frequency attenuating means according to a level of a middle-frequency signal of the input audio signal having a frequency zone different from that of a level of the low-frequency signal of the input audio signal and the low-frequency signal.
A sound processing device for processing sound, comprising:
- (A) low-frequency attenuating means for receiving an audio signal as its input, attenuating a low-frequency signal of the input audio signal and outputting a resultant audio signal;
- and
- (B) controlling means for controlling an attenuation characteristic in said low-frequency attenuating means, according to a level of the low-frequency signal of the input audio signal and a level of a middle-frequency signal of the audio signal outputted from said low-frequency attenuating means.
A sound processing device for processing sound, comprising:
- (A) frequency-characteristic varying means for receiving an audio signal as its input, varying a frequency characteristic of the input audio signal and outputting a resultant audio signal;
- (B) detecting means for detecting a level of a low frequency component in the input audio signal;
- and
- (C) control means for controlling a variable characteristic in said frequency-characteristic varying means, according to a level of a middle-frequency component of the input audio signal having a frequency zone different from that of a level of a low-frequency component of the input audio signal detected by said detecting means and the low-frequency component.
1 more element
A sound processing device for processing sound, comprising:
- (A) frequency-characteristic varying means for receiving an audio signal as its input, varying a frequency characteristic of the input audio signal and outputting a resultant audio signal;
- and
- (B) controlling means for controlling a variation characteristic in said frequency-characteristic varying means, according to a level of a low-frequency component of the input audio signal and a level of a middle-frequency component of the audio signal outputted from said frequency-characteristic varying means.
A sound processing device for processing sound, comprising:
- (A) frequency-characteristic varying means for receiving an audio signal as its input, varying a frequency characteristic of the input audio signal and outputting a resultant audio signal;
- (B) detecting means for detecting a level of a low frequency component of the input audio signal;
- and
- (C) control means for comparing a level of a low frequency component in the input audio signal detected by said detecting means with a level of another frequency component in said input audio signal to control a variable characteristic in said frequency-characteristic varying means according to a comparison result.
1 more element
A sound processing device for processing sound, comprising:
- (A) first low-frequency attenuating means for receiving a first audio signal as its input, attenuating a low-frequency signal of the input first audio signal and outputting a resultant audio signal;
- (B) second low-frequency attenuating means for receiving a second audio signal as its input, attenuating a low-frequency signal of the input second audio signal and outputting a resultant audio signal;
- and
- (C) control means for controlling attenuation characteristics in said respective first and second low-frequency attenuating means according to levels of middle-frequency signals of the respective input first and second audio signals having a frequency zone different from that of levels of the low-frequency signals of the respective first and second input audio signals and the low-frequency signals.
1 more element
A sound processing device for processing sound, comprising:
- (A) first low-frequency attenuating means for receiving a first audio signal as its input, attenuating a low-frequency signal of the input first audio signal and outputting a resultant audio signal;
- (B) second low-frequency attenuating means for receiving a second audio signal as its input, attenuating a low-frequency signal of the input second audio signal and outputting a resultant audio signal;
- and
- (C) controlling means for controlling attenuation characteristics in said respective first and second low-frequency attenuating means, according to levels of the low-frequency signals of the respective input first and second audio signals and levels of middle-frequency signals of the respective first and second audio signals outputted from said first and second low-frequency attenuating means.
1 more element
A sound processing device for processing sound, comprising:
- (A) first low-frequency attenuating means for receiving a first audio signal as its input, attenuating a low-frequency signal of the input first audio signal and outputting a resultant audio signal;
- (B) second low-frequency attenuating means for receiving a second audio signal as its input, attenuating a low-frequency signal of the input second audio signal and outputting a resultant audio signal;
- (C) adding means for forming and outputting a sum signal of the first audio signal outputted from said first low-frequency attenuating means and the second audio signal outputted from said second low-frequency attenuating means;
- (D) subtracting means for forming and outputting a difference signal of the first audio signal outputted from said first low-frequency attenuating means and the second audio signal outputted from said second low-frequency attenuating means;
- and
- (E) controlling means for controlling attenuation characteristics in said respective first and second low-frequency attenuating means, according to levels of the respective low-frequency signals of the input first and second audio signals and a level of a middle-frequency signal of the sum signal outputted from said adding means.
3 more elements
A sound processing device for processing sound, comprising:
- (A) first frequency-characteristic varying means for receiving a first audio signal as its input, varying a frequency characteristic of the input first audio signal and outputting a resultant audio signal;
- (B) second frequency-characteristic varying means for receiving a second audio signal as its input, varying a frequency characteristic of the input second audio signal and outputting a resultant audio signal;
- and
- (C) control means for controlling a variable characteristic of said first frequency-characteristic varying means according to levels of a low-frequency component in said first audio signal, and for controlling a variable characteristic of said second frequency characteristic varying means according to a level of a low frequency component in said second audio signal and a middle-frequency component in said second audio signal having a frequency zone different from that of the low-frequency component in said second audio signal.
1 more element
A sound processing device for processing sound, comprising:
- (A) first frequency-characteristic varying means for receiving a first audio signal as its input, varying a frequency characteristic of the input first audio signal and outputting a resultant audio signal;
- (B) second frequency-characteristic varying means for receiving a second audio signal as its input, varying a frequency characteristic of the input second audio signal and outputting a resultant audio signal;
- and
- (C) controlling means for controlling variation characteristics in said respective first and second frequency-characteristic varying means, according to levels of low-frequency components of the respective input first and second audio signals and levels of middle-frequency components of the respective first and second audio signals outputted from said first and second frequency-characteristic varying means.
1 more element
A sound processing device for processing sound, comprising:
- (A) first frequency-characteristic varying means for receiving a first audio signal as its input, varying a frequency characteristic of the input first audio signal and outputting a resultant audio signal;
- (B) second frequency-characteristic varying means for receiving a second audio signal as its input, varying a frequency characteristic of the input second audio signal and outputting a resultant audio signal;
- (C) adding means for forming and outputting a sum signal of the first audio signal outputted from said first frequency-characteristic varying means and the second audio signal outputted from said second frequency-characteristic varying means;
- (D) subtracting means for forming and outputting a difference signal of the first audio signal outputted from said first frequency-characteristic varying means and the second audio signal outputted from said second frequency-characteristic varying means;
- and
- (E) controlling means for controlling variation characteristics in said respective first and second frequency-characteristic varying means, according to levels of low-frequency components of the respective input first and second audio signals and a level of a middle-frequency component of the sum signal outputted from said adding means.
3 more elements
A sound processing device for processing sound, comprising:
- (A) first frequency-characteristic varying means for receiving a first audio signal as its input, varying a frequency characteristic of the input first audio signal and outputting a resultant audio signal;
- (B) second frequency-characteristic varying means for receiving a second audio signal as its input, varying a frequency characteristic of the input second audio signal and outputting a resultant audio signal;
- and
- (C) controlling means for controlling characteristics of said respective first and second frequency-characteristic varying means, according to a level of a low-frequency component of a difference signal of the input first and second audio signals and to a level of a middle-frequency component of a sum signal of the input first and second audio signals.
1 more element
A sound processing device for processing sound, comprising:
- (A) first frequency-characteristic varying means for receiving a first audio signal as the input of said first frequency-characteristic varying means, varying a frequency characteristic of the input first audio signal and outputting a resultant audio signal;
- (B) second frequency-characteristic varying means for receiving a second audio signal as the input of said second frequency-characteristic varying means, varying a frequency characteristic of the input second audio signal and outputting a resultant audio signal;
- and
- (C) controlling means for controlling characteristics of said respective first and second frequency-characteristic varying means, according to a level of a low-frequency component of a difference signal of the input first and second audio signals.
1 more element
Dependencies are inferred from the claim text.