Sound processing device, method, and program

Patent metadata

Field	Value
Publication number	US-2019305741-A1
Application number	US-201716463146-A
Country	US
Kind code	A1
Filing date	Dec 8, 2017
Priority date	Dec 22, 2016
Publication date	Oct 3, 2019
Grant date	—

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

1 . A sound processing device comprising:
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 a 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.

2 . The sound processing device according to claim 1 , wherein the prediction value calculation unit corrects a parameter of the equivalent model according to an actual measurement value of a current flowing through the speaker.

3 . The sound processing device according to claim 2 , wherein the prediction value calculation unit corrects mechanical system compliance as the parameter.

4 . The sound processing device according to claim 2 , wherein the prediction value calculation unit corrects a direct current resistance of a voice coil of the speaker as the parameter.

5 . The sound processing device according to claim 4 , further comprising:
a temperature calculation unit that calculates a temperature of the voice coil on the basis of the direct current resistance; and a temperature control unit that performs temperature control for suppressing a temperature increase of the voice coil with respect to the input signal according to the temperature of the voice coil.

6 . The sound processing device according to claim 1 , further comprising:
a displacement calculation unit that calculates the displacement of the speaker on a basis of an actual measurement value of a current flowing through the speaker, wherein, in a case in which a larger one of the displacement calculated by the displacement calculation unit and the prediction value is greater than the threshold value, the amplitude control unit performs amplitude control on the input signal.

7 . The sound processing device according to claim 1 , further comprising:
a delay unit that delays the input signal by a predetermined time and supplies the delayed signal to the amplitude control unit.

8 . The sound processing device according to claim 1 , wherein the prediction value calculation unit calculates the prediction value on the basis of the equivalent model determined by a plurality of parameters including a force coefficient that changes nonlinearly with respect to the displacement of the speaker and mechanical system compliance.

9 . The sound processing device according to claim 1 , wherein the amplitude control unit performs amplitude control on the input signal on a basis of a gain value determined from the prediction value and the threshold value.

10 . A sound processing method comprising the steps of:
calculating a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on a basis of an equivalent model of the speaker; and performing amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value.

11 . A program that causes a computer to execute a process including the steps of:
calculating a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on a basis of an equivalent model of the speaker; and performing amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value.

Assignees

• Sony Corp

Inventors

• Yoneda Michiaki
• Kuroda Yoshiyuki
• Kamata Masaki

Classifications

• H04R3/007

  Protection circuits for transducers · CPC title

• H04R1/2873

  for loudspeaker transducers · CPC title

• H04R1/22

  for obtaining desired frequency characteristic only  {(circuit for combining transducers having different responses H04R3/00; for hearing aids H04R25/407)} · CPC title

• H03G3/3005 Primary

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

• H03G2201/708

  being temperature · CPC title