Recording method of true wireless stereo earbuds and recording system

Patent metadata

Field	Value
Publication number	US-12425506-B2
Application number	US-202117910591-A
Country	US
Kind code	B2
Filing date	Mar 10, 2021
Priority date	Mar 13, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

In this application, by using a method for collaborative recording by using a mobile terminal and the true wireless stereo earbud, recording with more complete data amount can be collected, and cooperative noise reduction is performed on a recording signal collected by the mobile terminal and a recording signal collected by the true wireless stereo earbud, so that accuracy and integrity of a human voice signal obtained through separation are higher. Further, in this application, when the true wireless stereo earbud performs recoding in a mode of single-earbud recording, a data amount of the true wireless stereo earbud is relatively small. Therefore, when the mobile terminal receives, through Bluetooth, data sent by the true wireless stereo earbud, excessive occupation of Bluetooth bandwidth of the mobile terminal is avoided, and power consumption of a mobile phone is reduced.

First claim

What is claimed is:

1. A recording method of true wireless stereo earbuds, comprising:
collecting, by a first true wireless stereo earbud of the true wireless stereo earbuds, a first audio signal,
converting, by the first true wireless stereo earbud, the first audio signal into a first digital audio signal in a pulse code modulation (PCM) format by using an analog-to-digital converter and pulse code modulation,
converting, by a second true wireless stereo earbud, a second audio signal into a second digital audio signal in the PCM format by using the analog-to-digital converter and the pulse code modulation, wherein a mobile terminal performs noise reduction, filtering, sampling rate conversion, and bit width conversion on the first digital audio signal and the second digital audio signal, and
transmitting, by the first true wireless stereo earbud, the first digital audio signal to the mobile terminal.

2. The recording method according to claim 1 , further comprising:
collecting, by the second true wireless stereo earbud of the true wireless stereo earbuds, the second audio signal;
converting, by the second true wireless stereo earbud, the second audio signal into the second digital audio signal in a PCM format; and
transmitting the second digital audio signal to the first true wireless stereo earbud, wherein the first true wireless stereo earbud transmits the first digital audio signal and the second digital audio signal to the mobile terminal.

3. The recording method according to claim 2 , further comprising:
performing, by the first true wireless stereo earbud, delay alignment on the first digital audio signal and the second digital audio signal.

4. The recording method according to claim 1 , wherein a priority of the first true wireless stereo earbud is set to be higher than a second true wireless stereo earbud.

5. The recording method according to claim 1 , wherein a manner of communication between the first true wireless stereo earbud and the mobile terminal is Bluetooth communication, and a manner of communication between the first true wireless stereo earbud and a second true wireless stereo earbud is Bluetooth communication.

6. The recording method according to claim 1 , wherein the mobile terminal is configured to perform following operations:
receiving the first digital audio signal;
collecting a third audio signal, and converting the third audio signal into a third digital audio signal;
decoding the first digital audio signal, and performing delay alignment on a decoded first digital audio signal and the third digital audio signal; and
performing collaborative noise reduction on the first digital audio signal and the third digital audio signal obtained after the delay alignment, to obtain a recording signal.

7. The recording method according to claim 2 , wherein the mobile terminal is configured to perform following operations:
receiving the first digital audio signal and the second digital audio signal;
collecting a third audio signal, and converting the third audio signal into a third digital audio signal;
decoding the first digital audio signal and the second digital audio signal, and performing delay alignment on a decoded first digital audio signal, a decoded second digital audio signal, and the third digital audio signal; and
performing collaborative noise reduction on the first digital audio signal, the second digital audio signal, and the third digital audio signal obtained after the delay alignment, to obtain a recording signal.

8. The recording method according to claim 2 , further comprising:
receiving and decoding, by the first true wireless stereo earbud, a first accompaniment audio signal from the mobile terminal; and/or
receiving and decoding, by the second true wireless stereo earbud, a second accompaniment audio signal from the mobile terminal;
performing, by the first true wireless stereo earbud, audio mixing on a decoded first accompaniment audio signal and the first digital audio signal, to obtain a first audio mixing signal; and/or
performing, by the second true wireless stereo earbud, audio mixing on a decoded second accompaniment audio signal and the second digital audio signal, to obtain a second audio mixing signal; and
converting, by the first true wireless stereo earbud, the first audio mixing signal into an analog audio mixing signal, and playing the analog audio mixing signal by using a speaker of the first true wireless stereo earbud; and/or
converting, by the second true wireless stereo earbud, the second audio mixing signal into an analog audio mixing signal, and playing the analog audio mixing signal by using a speaker of the second true wireless stereo earbud.

9. The recording method according to claim 8 , further comprising:
performing delay alignment before the first true wireless stereo earbud plays the first audio mixing signal and the second true wireless stereo earbud plays the second audio mixing signal, so that the first audio mixing signal and the second audio mixing signal are synchronously played.

10. The recording method according to claim 3 , further comprising:
receiving and decoding, by the first true wireless stereo earbud, an accompaniment audio signal from the mobile terminal;
performing, by the first true wireless stereo earbud, audio mixing on the second digital audio signal, the first digital audio signal, and a decoded accompaniment audio signal, to obtain an audio mixing signal;
converting, by the first true wireless stereo earbud, the audio mixing signal into a first analog audio mixing signal, and playing the first analog audio mixing signal by using a speaker of the first true wireless stereo earbud;
sending, by the first true wireless stereo earbud, the audio mixing signal to the second true wireless stereo earbud; and
decoding, by the second true wireless stereo earbud, the audio mixing signal, converting a decoded audio mixing signal into a second analog audio mixing signal, and playing the second analog audio mixing signal by using a speaker of the second true wireless stereo earbud.

11. The recording method according to claim 10 , further comprising:
before the first true wireless stereo earbud plays the first analog audio mixing signal, performing, by the first true wireless stereo earbud, delay compensation on the first analog audio mixing signal, so that the first analog audio mixing signal and the second analog audio mixing signal are synchronously played.

12. A recording system, comprising:
a first true wireless stereo earbud to be wirelessly connected to a mobile terminal, wherein the first true wireless stereo earbud is configured to
collect a first audio signal,
convert the first audio signal into a first digital audio signal in a pulse code modulation (PCM) format by using an analog-to-digital converter and pulse code modulation,
convert a second audio signal into a second digital audio signal in the PCM format by using the analog-to-digital converter and the pulse code modulation, wherein the mobile terminal performs noise reduction, filtering, sampling rate conversion, and bit width conversion on the first digital audio signal and the second digital audio signal, and
transmit the first digital audio signal to the mobile terminal.

13. The recording system according to claim 12 , further comprising:
a second true wireless stereo earbud wirelessly connected to the first true wireless stereo earbud and the mobile terminal, wherein the second true wireless stereo earbud is configured to:
collect the second audio signal,
convert the second audio signal into the second digital audio signal in the PCM format, and
transmit the

Assignees

• Huawei Tech Co Ltd

Inventors

• Yang Xiao
• Zhang Yijun
• Feng Jianting
• Li Chunjian

Classifications

• H04R2420/07

  Applications of wireless loudspeakers or wireless microphones · CPC title

• H04R1/1083

  Reduction of ambient noise (active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06) · CPC title

• G06F3/165

  Management of the audio stream, e.g. setting of volume, audio stream path · CPC title

• G10H1/365

  the accompaniment information being stored on a host computer and transmitted to a reproducing terminal by means of a network, e.g. public telephone lines · CPC title

• G10H2240/321

  Bluetooth® · CPC title