Sound processing device and method to suppress an excessive amplitude

Patent metadata

Field	Value
Publication number	US-10734959-B2
Application number	US-201716463146-A
Country	US
Kind code	B2
Filing date	Dec 8, 2017
Priority date	Dec 22, 2016
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

The present technology relates to a sound processing device, a method, and a program capable of suppressing an excessive amplitude and obtaining higher quality of sound. A sound processing device includes: a prediction value calculation unit that calculates a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on the basis of an equivalent model of the speaker; and an amplitude control unit that performs amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value. The present technology can be applied to a sound reproduction system.

First claim

The invention claimed is:

1. A sound processing device, comprising:
circuitry configured to:
calculate a prediction value of a displacement of a speaker, wherein the prediction value is calculated based on an input signal supplied to the speaker and an equivalent model of the speaker; and
control an amplitude of the input signal based on the prediction value greater than a threshold value, wherein
the amplitude of the input signal is controlled based on a gain value, and
the gain value is a ratio of the threshold value to the prediction value.

2. The sound processing device according to claim 1 , wherein the circuitry is configured to correct a parameter of the equivalent model based on an actual measurement value of a current that flows through the speaker.

3. The sound processing device according to claim 2 , wherein the circuitry is further configured to correct a mechanical system compliance as the parameter.

4. The sound processing device according to claim 2 , wherein the circuitry is further configured to correct a direct current resistance of a voice coil of the speaker as the parameter.

5. The sound processing device according to claim 4 , wherein the circuitry is further configured to:
calculate a temperature of the voice coil based on the direct current resistance; and
control the temperature to suppress a temperature increase of the voice coil with respect to the input signal.

6. The sound processing device according to claim 1 , wherein the circuitry is further configured to:
calculate the displacement of the speaker based on an actual measurement value of a current that flows through the speaker; and
control the amplitude of the input signal based on larger one of the calculated displacement or the prediction value that is greater than the threshold value.

7. The sound processing device according to claim 1 , wherein the circuitry is further configured to:
delay the input signal by a determined time; and
supply the delayed input signal.

8. The sound processing device according to claim 1 , wherein
the circuitry is further configured to calculate the prediction value based on the equivalent model determined by a plurality of parameters, and
the plurality of parameters includes
a force coefficient that changes nonlinearly with respect to the displacement of the speaker and
a mechanical system compliance.

9. A sound processing method, comprising:
calculating a prediction value of a displacement of a speaker, wherein the prediction value is calculated based on an input signal supplied to the speaker and an equivalent model of the speaker; and
controlling an amplitude of the input signal based on the prediction value greater than a threshold value, wherein
the amplitude of the input signal is controlled based on a gain value, and
the gain value is a ratio of the threshold value to the prediction value.

10. A non-transitory computer-readable medium having stored thereon, computer-executable instructions, which when executed by a computer, cause the computer to execute operations, the operations comprising:
calculating a prediction value of a displacement of a speaker, wherein the prediction value is calculated based on an input signal supplied to the speaker and an equivalent model of the speaker; and
controlling an amplitude of the input signal based on the prediction value greater than a threshold value, wherein
the amplitude of the input signal is controlled based on a gain value, and
the gain value is a ratio of the threshold value to the prediction value.

Assignees

• Sony Corp

Inventors

• Yoneda Michiaki
• Kuroda Yoshiyuki
• Kamata Masaki

Classifications

• H03G3/3005 Primary

  in amplifiers suitable for low-frequencies, e.g. audio amplifiers (H03G3/32, H03G3/34 take precedence) · CPC title

• H04R3/00

  Circuits for transducers (arrangements for producing a reverberation or echo sound G10K15/08; amplifiers H03F) · CPC title

• H04R1/2873

  for loudspeaker transducers · CPC title

• H04R3/007

  Protection circuits for transducers · CPC title

• H03G2201/708

  being temperature · CPC title