Acoustic capture devices and methods thereof

Patent metadata

Field	Value
Publication number	US-10104472-B2
Application number	US-201715418855-A
Country	US
Kind code	B2
Filing date	Jan 30, 2017
Priority date	Mar 21, 2016
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

An acoustic capture device includes an acoustic transducer, an acoustic detector, an analog-to-digital converter, and a processing element. The acoustic transducer captures an acoustic wave to generate an analog signal. The acoustic detector detects, according to the analog signal, a specific event to generate a trigger signal. The analog-to-digital converter converts the analog signal to generate a digital signal. The processing element receives the trigger signal to execute a control process. The control process includes: analyzing the digital signal to determine ambient information; determining a first set of parameters of the acoustic detector according to the ambient information; performing a control information protocol to adjust the acoustic detector according to the first set of parameters; and performing, according to the ambient information, an enhancement processing on the digital signal to generate an enhanced digital signal.

First claim

What is claimed is:

1. An acoustic capture device, comprising:
an acoustic transducer, capturing an acoustic wave to generate an analog signal;
an acoustic detector, detecting, according to the analog signal, a specific event to generate a trigger signal;
an analog-to-digital converter, converting the analog signal to generate a digital signal; and
a processing element, receiving the trigger signal to execute a control process, wherein the control process comprises:
analyzing the digital signal to determine ambient information;
determining a first set of parameters of the acoustic detector according to the ambient information;
performing a control information protocol to adjust the acoustic detector according to the first set of parameters; and
performing, according to the ambient information, an enhancement processing on the digital signal to generate an enhanced digital signal.

2. The acoustic capture device of claim 1 , wherein the acoustic wave is in a frequency range, wherein the frequency range comprises a human-audible frequency range and a human-inaudible frequency range.

3. The acoustic capture device of claim 1 , wherein the specific event comprises a voice, speech, and ultrasound, wherein the acoustic detector generates the trigger signal when at least one of the voice, the speech, and the ultrasound is detected.

4. The acoustic capture device of claim 1 , wherein the control process further comprises:
determining a second set of parameters of the acoustic transducer according to the ambient information; and
performing the control information protocol to adjust the acoustic transducer according to the second set of parameters.

5. The acoustic capture device of claim 4 , wherein the control process further comprises:
determining a third set of parameters of the analog-to-digital converter according to the ambient information; and
performing the control information protocol to adjust the analog-to-digital converter according to the third set of parameters.

6. The acoustic capture device of claim 5 , wherein the first set of parameters comprises a cutoff frequency, a detecting threshold, and a transfer function of the acoustic detector, wherein the second set of parameters comprises a frequency response, an output dynamic range, sensitivity and a noise floor of the acoustic transducer, wherein the third set of parameters comprises a frequency response, sensitivity, an input dynamic range, an output bit resolution, and an output noise floor of the analog-to-digital converter.

7. The acoustic capture device of claim 5 , wherein the processing element performs the control information protocol to ensure an optimal balance between power consumption and performance of the acoustic capture device.

8. The acoustic capture device of claim 5 , wherein the step of analyzing the digital signal to determine the ambient information comprises:
analyzing the digital signal to determine the ambient information about where the acoustic transducer is located; and
determining an environment condition about where the acoustic transducer is located according to the ambient information, wherein the environment condition comprises a quiet environment, a normal environment, a noisy environment, and a babble environment;
wherein the steps of determining the first set of parameters of the acoustic detector according to the ambient information, determining the second set of parameters of the acoustic transducer according to the ambient information, and determining the third set of parameters of the analog-to-digital converter according to the ambient information further comprise:
consulting a look-up table to determine the first set, the second set, and the third set of parameters according to the environment condition.

9. The acoustic capture device of claim 1 , wherein the enhancement processing comprises at least one of acoustic echo cancellation, noise suppression, microphone array beamforming, and intelligent acoustic equalizations.

10. The acoustic capture device of claim 1 , wherein the control process further comprises:
performing a data transport protocol to provide the ambient information and the enhanced digital signal to a host.

11. A method for controlling an acoustic capture device comprising an acoustic transducer, an acoustic detector, and an analog-to-digital converter, comprising:
by the acoustic transducer, capturing an acoustic wave to generate an analog signal;
using the acoustic detector to detect, according to the analog signal, a specific event to generate a trigger signal;
using the analog-to-digital converter to convert the analog signal to generate a digital signal;
executing a control process in response to the trigger signal, wherein the control process comprises:
analyzing the digital signal to determine ambient information;
determining a first set of parameters of the acoustic detector according to the ambient information;
performing a control information protocol to adjust the acoustic detector according to the first set of parameters; and
performing, according to the ambient information, an enhancement processing on the digital signal to generate an enhanced digital signal.

12. The method of claim 11 , wherein the acoustic wave is in a frequency range, wherein the frequency range comprises a human-audible frequency range and a human-inaudible frequency range.

13. The method of claim 11 , wherein the specific event comprises a voice, speech, and ultrasound, wherein the acoustic detector generates the trigger signal when at least one of the voice, the speech, and the ultrasound is detected.

14. The method of claim 11 , wherein the control process further comprises:
determining a second set of parameters of the acoustic transducer according to the ambient information; and
performing the control information protocol to adjust the acoustic transducer according to the second set of parameters.

15. The method of claim 14 , wherein the control process further comprises:
determining a third set of parameters of the analog-to-digital converter according to the ambient information; and
performing the control information protocol to adjust the analog-to-digital converter according to the third set of parameters.

16. The method of claim 15 , wherein the first set of parameters comprises a cutoff frequency, a detecting threshold, and a transfer function of the acoustic detector, wherein the second set of parameters comprises a frequency response, an output dynamic range, sensitivity and a noise floor of the acoustic transducer, wherein the third set of parameters comprises a frequency response, sensitivity, an input dynamic range, an output bit resolution, and an output noise floor of the analog-to-digital converter.

17. The method of claim 15 , wherein the control information protocol is performed to ensure an optimal balance between power consumption and performance of the acoustic capture device.

18. The method of claim 15 , wherein the step of analyzing the digital signal to determine the ambient information comprises:
analyzing the digital signal to determine the ambient information about where the acoustic transducer is located; and
determining an environment condition about where the acoustic transducer is located according to the ambient information, wherein the environment condition comprises a quiet environment, a normal environment, a noisy environment, and a babble environment;
wherein the steps of determining the first set of parameters of the acoustic detector according to the ambient information, deter

Assignees

• Fortemedia Inc

Inventors

• Wei Qiang
• Chen Lung-Chu Joseph
• RU Powen
• Liu Qing-Guang
• Huang Yen-Son Paul

Classifications

• H04R29/004

  for microphones (H04R29/007 takes precedence) · CPC title

• H04R3/04 Primary

  for correcting frequency response · CPC title

• H04R2499/11

  Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's · CPC title

• H04R1/04

  Structural association of microphone with electric circuitry therefor (in electric hearing aids H04R25/00) · CPC title

• H04W52/02

  Power saving arrangements · CPC title