Signal processing device and signal processing method

• US 10,567,697 B2
• Filed: 02/04/2019
• Issued: 02/18/2020
• Est. Priority Date: 12/02/2015
• Status: Active Grant

• Current Assignee: Beijing Eswin Computing Technology Company Limited
• Original Assignee: Socionext Inc.
• Inventors: Miyasaka, Shuji
• Primary Examiner(s): Ramakrishnaiah, Melur
• Application Number:
  US16/266,464
• Publication Number:
  US 20190182447A1
• Time in Patent Office: 379 Days
• Field of Search: 381 941, 381 98, 381101, 381118, 381 62, 381 17, 381106, 700 94
• CPC Class Codes: H03F 1/42 Modifications of amplifiers to extend the bandwidth
• CPC Class Codes: H04N 5/60 for the sound signals
• CPC Class Codes: H04N 5/602 for digital sound signals
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones
• CPC Class Codes: H04R 3/04 for correcting frequency response
• CPC Class Codes: H04S 2400/09 Electronic reduction of distortion of stereophonic sound systems
• CPC Class Codes: H04S 7/307 Frequency adjustment, e.g. tone control H04S7/301 takes precedence

Abstract

A signal processing device includes: a resonant band-pass filter which extracts a frequency component which causes resonance of a housing from an input signal; a harmonic generating unit configured to generate a harmonic signal for an output signal of the resonant band-pass filter; an adding unit configured to add an output signal of the harmonic generating unit and at least a portion of a frequency component of the input signal; and a resonant band-stop filter which removes the frequency component which causes the resonance of the housing from an output signal of the adding unit.

Claims

1. A signal processing device comprising:

a resonant band-pass filter which extracts a frequency component which causes resonance of a housing from an input signal;

a harmonic generating unit configured to generate a harmonic signal for an output signal of the resonant band-pass filter;

an adding unit configured to add an output signal of the harmonic generating unit and at least a portion of a frequency component of the input signal; and

a resonant band-stop filter which removes the frequency component which causes the resonance of the housing from an output signal of the adding unit.

2. The signal processing device according to claim 1, further comprising:

a setting unit configured to set information on a characteristic of the housing; and

a harmonic adjusting unit configured to adjust the output signal of the harmonic generating unit according to the information set by the setting unit,

wherein the setting unit is configured to set a frequency which causes the resonance of the housing as the information, and

the harmonic adjusting unit is configured to;

perform adjustment so that a signal including an N-th overtone generated by the harmonic generating unit is sent to the adding unit, when the frequency set by the setting unit is lower than a predetermined value; and

perform adjustment so that a signal including an M-th overtone generated by the harmonic generating unit is sent to the adding unit, when the frequency set by the setting unit is higher than or equal to the predetermined value, M being less than N.

3. The signal processing device according to claim 1, further comprising:

a setting unit configured to set information on a characteristic of the housing;

a harmonic adjusting unit configured to adjust the output signal of the harmonic generating unit according to the information set by the setting unit; and

a filter adjusting unit configured to adjust a gain of the resonant band-stop filter according to the information set by the setting unit,

wherein the setting unit is configured to set a resonance sensitivity of the housing as the information,

the harmonic adjusting unit is configured to;

amplify the output signal of the harmonic generating unit by A times and send the amplified output signal to the adding unit, when the resonance sensitivity of the housing set by the setting unit is greater than a predetermined value; and

amplify the output signal of the harmonic generating unit by B times, when the resonance sensitivity of the housing set by the setting unit is less than or equal to the predetermined value, B being less than A, and

the filter adjusting unit is configured to;

set the gain of the resonant band-stop filter to −

G, when the resonance sensitivity is greater than the predetermined value; and

set the gain of the resonant band-stop filter to −

H, when the resonance sensitivity is less than or equal to the predetermined value, −

H being greater than −

G.

4. A signal processing device comprising:

a housing;

a resonant band-pass filter which extracts a frequency component which causes resonance of the housing from an input signal;

a harmonic generating unit configured to generate a harmonic signal for an output signal of the resonant band-pass filter;

an adding unit configured to add an output signal of the harmonic generating unit and at least a portion of a frequency component of the input signal; and

a resonant band-stop filter which removes the frequency component which causes the resonance of the housing from an output signal of the adding unit.

5. A signal processing method performed by a signal processing device, the method comprising:

extracting a frequency component which causes resonance of a housing from an input signal;

generating a harmonic signal for the frequency component extracted in the extracting;

adding the harmonic signal generated in the generating and at least a portion of a frequency component of the input signal; and

removing the frequency component which causes the resonance of the housing from a signal obtained by the adding.

6. A signal processing method performed by a signal processing device which includes a housing, the method comprising:

extracting a frequency component which causes resonance of the housing from an input signal;

generating a harmonic signal for the frequency component extracted in the extracting;

adding the harmonic signal generated in the generating and at least a portion of a frequency component of the input signal; and

removing the frequency component which causes the resonance of the housing from a signal obtained by the adding.