CN110661907B - Bluetooth-based high-definition call recording method - Google Patents

Bluetooth-based high-definition call recording method Download PDF

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CN110661907B
CN110661907B CN201810703777.2A CN201810703777A CN110661907B CN 110661907 B CN110661907 B CN 110661907B CN 201810703777 A CN201810703777 A CN 201810703777A CN 110661907 B CN110661907 B CN 110661907B
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mobile terminal
voice
bluetooth
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audio device
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CN110661907A (en
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张德明
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Beijing Sabine Technologies Ltd
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Beijing Saibin Science & Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/656—Recording arrangements for recording a message from the calling party for recording conversations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephone Function (AREA)

Abstract

The invention provides a high-definition call recording method based on Bluetooth, which mixes local high-definition user voice and remote user voice in Bluetooth audio equipment, establishes a return channel by adopting a specific protocol, returns the mixed voice to a mobile terminal, and records by the mobile terminal, so that the problem of recording when the Bluetooth audio equipment is used is solved, and meanwhile, voice signals under different protocols can be operated mutually during sound mixing, thereby further improving the interactivity and interestingness of recording.

Description

Bluetooth-based high-definition call recording method
Technical Field
The invention belongs to the field of audio frequency, and particularly relates to a high-definition call recording method based on Bluetooth.
Background
In the prior art, if a user wants to record a call when using a mobile terminal to make a call, the call can be recorded through a mobile phone, and if the call is made through a bluetooth headset, the user cannot record the call by using the mobile phone, which causes inconvenience for the user.
In addition, the bluetooth alliance sig (special Interest group) defines a plurality of bluetooth protocols, including A2DP, HFP, AVRCP, etc., and in the prior art, the HFP (hands free profile) protocol is often used to connect a handset to a bluetooth headset.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-definition call recording method based on Bluetooth, which mixes the voice of a local high-definition user and the voice of a remote user in Bluetooth audio equipment, establishes a return channel by adopting a specific protocol to return the mixed voice to a mobile terminal, and records the mixed voice by the mobile terminal, so that the problem of recording when the Bluetooth audio equipment is used is solved, and meanwhile, voice signals under different protocols can be operated mutually during sound mixing, thereby further improving the interactivity and the interestingness of recording.
A high-definition call recording method based on Bluetooth is provided, a mobile terminal is provided, the mobile terminal comprises a first Bluetooth module and Bluetooth audio equipment, and the Bluetooth audio equipment comprises a second Bluetooth module, a loudspeaker and a microphone; establishing a two-way communication channel between the mobile terminal and the Bluetooth audio equipment by using the HFP protocol; the far-end user dials the telephone number of the user mobile terminal, and after the local user operates the mobile terminal or the Bluetooth audio equipment to switch on the call, the voice of the far-end user is communicated with the mobile terminal through the two-way callThe channel is sent to a Bluetooth audio device and the user hears the far-end user voice V played back by the speaker1(ii) a At the same time, the microphone of the Bluetooth audio device receives the voice V of the local user2The Bluetooth audio equipment uses the two-way communication channel under the HFP protocol to convert the voice V of the local user into the voice V2Sending the data back to the mobile terminal, and sending the data to the remote user by the mobile terminal through the cellular network; on the basis of maintaining the two-way communication channel under the HFP protocol, an audio return channel under the Bluetooth RFCOMM protocol is established, and the voice V of the local user is transmitted in the Bluetooth audio equipment2With speech V from a remote user1Mixing, and transmitting the audio mixing signal back to the mobile terminal by using the audio return channel under the RFCOMM protocol; and the mobile terminal receives and records the sound mixing signal and stores the sound mixing signal in the mobile terminal.
Wherein, the sound mixing is carried out according to the following formula:
Figure BDA0001714992050000011
wherein, XL、XRFor left and right channel return signals, V, respectively1For far-end user speech, V2For local user speech, alpha is a coefficient,
0≤α≤1。
wherein, before mixing, if the far-end user voice V under HFP protocol1Is lower than the sampling rate of the audio return channel under the RFCOMM protocol, the far-end user voice V under the HFP protocol is processed1The signal is up-sampled.
The mobile terminal comprises a mobile phone, a tablet computer and a laptop computer.
The bluetooth audio device includes, but is not limited to, a headset with a microphone, and a microphone to which the headset can be connected.
Drawings
FIG. 1 is a schematic diagram of uplink and downlink signal transmission according to the present invention
Detailed Description
As in the background artIn other words, the bluetooth alliance SIG defines a plurality of bluetooth protocols, but it is not limited to running a plurality of protocols simultaneously between devices, which provides an idea for implementing the present invention. Fig. 1 shows a first embodiment of the present invention, and provides a mobile terminal 1, where the mobile terminal 1 includes a first bluetooth module (not shown in the figure), and provides a bluetooth audio device 2, where the bluetooth audio device 2 includes a second bluetooth module (not shown in the figure), a speaker 21, and a microphone 22; establishing a bidirectional communication channel between the mobile terminal 1 and the Bluetooth audio device 2 by using an HFP protocol; the remote user dials the telephone number of the user mobile terminal 1, and after the local user operates the mobile terminal 1 or the Bluetooth audio device 2 to make the call, the voice of the remote user is transmitted from the mobile terminal 1 to the Bluetooth audio device 2 via the two-way communication channel, and the user hears the voice V of the remote user reproduced by the speaker 211(ii) a At the same time, the microphone 22 of the Bluetooth Audio device 2 receives the local user's voice V2The bluetooth audio device 2 uses the bidirectional communication channel under the HFP protocol to transmit the local user voice V2Sent back to the mobile terminal 1 and sent by the mobile terminal 1 to the remote user via the cellular network.
In order to realize recording, it is necessary to establish an audio return channel under the bluetooth RFCOMM protocol on the basis of maintaining the two-way communication channel under the HFP protocol, and to transmit the local user voice V in the bluetooth audio device 22With speech V from a remote user1Mixing, and then transmitting the audio mixing signal back to the mobile terminal 1 by using the transmission channel under the RFCOMM protocol; the mobile terminal 1 receives the mixed sound signal and records the mixed sound signal, and the mixed sound signal is stored in the mobile terminal 1. The RFCOMM protocol can support the audio signal transmission of double channels with the sampling rate of 48KHz per channel, so that the uplink return signal can realize high-definition stereo transmission; further, mixing may be performed according to the following formula:
Figure BDA0001714992050000021
wherein, XL、XRPass back for left and right channels, respectivelySignal, V1For far-end user speech, V2The voice is the local user voice, alpha is a coefficient, and alpha is more than or equal to 0 and less than or equal to 1; because the HFP protocol supports a maximum sampling rate of 16KHz and the RFCOMM protocol supports a maximum sampling rate of 48KHz, if the HFP protocol is a far-end user voice V1The sampling rate of (b) is lower than that of the audio return channel under the RFCOMM protocol, before audio mixing, the far-end user voice V needs to be sent to the bluetooth audio device 2 under the HFP protocol1The signal is up-sampled and for the local user voice V2This is not required as the high sampling rate can be used directly at the time of acquisition.
By means of the above-described transmission of the local user voice V at the Bluetooth Audio device 22With the far-end user voice V1The method of mixing and then returning to the mobile terminal 1 can realize the effect of recording the call by using the mobile phone even when using the Bluetooth earphone, and can change the sound image position of the voice of the user by adjusting the coefficient alpha so as to distinguish the voice of the local user from the voice of the remote user, thereby improving the recording effect.
The mobile terminal 1 in the above embodiments includes, but is not limited to, a mobile phone, a tablet computer, a laptop computer; the bluetooth audio device 2 includes, but is not limited to, a headset with a microphone, a microphone to which the headset can be connected; typically, the above method may be implemented using the 8670/8675 chipset of a CSR platform, which is well known to those skilled in the art.

Claims (3)

1. A high-definition call recording method based on Bluetooth is provided, a mobile terminal (1) is provided, the mobile terminal (1) comprises a first Bluetooth module, a Bluetooth audio device (2) is provided, and the Bluetooth audio device (2) comprises a second Bluetooth module, a loudspeaker (21) and a microphone (22); establishing a bidirectional communication channel between the mobile terminal (1) and the Bluetooth audio device (2) by using an HFP protocol; the remote user dials the telephone number of the user mobile terminal (1), after the local user operates the mobile terminal (1) or the Bluetooth audio device (2) to switch on the call, the voice of the remote user is transmitted to the Bluetooth audio device (2) from the mobile terminal (1) through the two-way communication channel, and the user hears the voice V of the remote user played back by the loudspeaker (21)1(ii) a At the same time, a microphone (22) of the Bluetooth audio device (2) receives the voice V of the local user2The Bluetooth audio device (2) uses the two-way communication channel under the HFP protocol to transmit the voice V of the local user2Sending back to the mobile terminal (1) and sending by the mobile terminal (1) to the remote user via the cellular network; characterized in that on the basis of keeping the two-way communication channel under the HFP protocol, an audio return channel under the Bluetooth RFCOMM protocol is established, and the voice V of the local user is transmitted in the Bluetooth audio device (2)2With speech V from a remote user1Mixing, and transmitting the audio mixing signal back to the mobile terminal (1) by using the audio transmission channel under the RFCOMM protocol; the mobile terminal (1) receives and records the audio mixing signal and stores the audio mixing signal in the mobile terminal (1);
mixing is performed according to the following formula:
Figure FDA0002793186870000011
wherein, XL、XRFor left and right channel return signals, V, respectively1For far-end user speech, V2The voice is the local user voice, alpha is a coefficient, and alpha is more than or equal to 0 and less than or equal to 1;
before mixing, if far-end user voice V under HFP protocol1If the sampling rate of the voice is lower than that of the audio return channel under the RFCOMM protocol, the voice V of the far-end user under the HFP protocol is processed1The signal is up-sampled;
the HFP protocol supports a sampling rate of 16KHz at most, and the RFCOMM protocol supports a sampling rate of 48KHz at most;
by adjusting the coefficient alpha, the sound image position of the user voice is changed, thereby distinguishing the local and remote user voices.
2. The sound recording method as claimed in claim 1, wherein the mobile terminal (1) comprises a mobile phone, a tablet computer, a laptop computer.
3. The sound recording method as claimed in claim 1, wherein the bluetooth audio device (2) includes, but is not limited to, a headset with a microphone, a microphone connectable to a headset.
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CN111261175A (en) * 2020-01-17 2020-06-09 北京塞宾科技有限公司 Bluetooth audio signal transmission method and device
CN111385780A (en) * 2020-01-17 2020-07-07 北京塞宾科技有限公司 Bluetooth audio signal transmission method and device
CN111225102A (en) * 2020-01-17 2020-06-02 北京塞宾科技有限公司 Bluetooth audio signal transmission method and device

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CN106028208A (en) * 2016-07-25 2016-10-12 北京塞宾科技有限公司 Wireless karaoke microphone headset
CN106251890A (en) * 2016-08-31 2016-12-21 广州酷狗计算机科技有限公司 A kind of methods, devices and systems of recording song audio frequency
CN106656276A (en) * 2016-12-15 2017-05-10 北京塞宾科技有限公司 Bluetooth audio based karaoke method
CN106993242A (en) * 2017-04-03 2017-07-28 张德明 A kind of musical instrument deduction microphone system

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US8559651B2 (en) * 2011-03-11 2013-10-15 Blackberry Limited Synthetic stereo on a mono headset with motion sensing

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
CN106028208A (en) * 2016-07-25 2016-10-12 北京塞宾科技有限公司 Wireless karaoke microphone headset
CN106251890A (en) * 2016-08-31 2016-12-21 广州酷狗计算机科技有限公司 A kind of methods, devices and systems of recording song audio frequency
CN106656276A (en) * 2016-12-15 2017-05-10 北京塞宾科技有限公司 Bluetooth audio based karaoke method
CN106993242A (en) * 2017-04-03 2017-07-28 张德明 A kind of musical instrument deduction microphone system

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