CN110662204A - Music and voice transmission operation method based on Bluetooth - Google Patents
Music and voice transmission operation method based on Bluetooth Download PDFInfo
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- CN110662204A CN110662204A CN201810703778.7A CN201810703778A CN110662204A CN 110662204 A CN110662204 A CN 110662204A CN 201810703778 A CN201810703778 A CN 201810703778A CN 110662204 A CN110662204 A CN 110662204A
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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Abstract
The invention provides a music and voice transmission operation method based on Bluetooth, which adopts various Bluetooth audio protocols in uplink and downlink channels and operates uplink or downlink audio under different Bluetooth protocols, thereby not only obviously improving the sound quality obtained by a user, increasing the interaction flexibility between music and voice, but also enhancing the user experience.
Description
Technical Field
The invention belongs to the field of audio frequency, and particularly relates to a music and voice transmission operation method based on Bluetooth.
Background
Nowadays, there are various karaoke platforms and live broadcast platforms on various mobile terminals, and accordingly, various bluetooth audio devices are increasingly applied to these platforms, fig. 1 shows a typical application scenario, when a singer or a webcast wears a bluetooth headset microphone or uses a bluetooth microphone with an inserted headset to sing or broadcasting directly, the singer or the webcast often needs to listen to music from a mobile terminal and sing or speak, and the voice of the singer or the webcast is then transmitted back to the mobile terminal and recorded by the mobile terminal or transmitted to an external network, in this case, both the downstream music and the upstream voice use bluetooth HFP (handfree profile) protocol (bluetooth alliance (sig) defining a plurality of bluetooth protocols including A2DP, HFP, AVRCP, etc.), there is no interaction between music and voice, and the HFP protocol supports only single-channel 16KHz sampling rate bluetooth audio transmission at the highest, the tone quality is poor when listening to music and returning singing voice, the requirement of HiFi tone quality cannot be met, and the experience effect of music of singers or anchor is poor.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a music and voice transmission operation method based on Bluetooth, which adopts a plurality of Bluetooth audio protocols in uplink and downlink channels and operates uplink or downlink audio under different protocols of Bluetooth, thereby not only obviously improving the sound quality obtained by a user, increasing the interaction flexibility between music and voice, but also enhancing the user experience.
The method comprises the steps of providing a first mobile terminal, wherein the first mobile terminal comprises a first Bluetooth module; providing a Bluetooth audio device, wherein the Bluetooth audio device comprises a second Bluetooth module, a loudspeaker and a microphone; establishing Bluetooth connection between a first mobile terminal and Bluetooth audio equipment; establishing a music transmission channel by using a Bluetooth A2DP protocol, sending a music signal to a Bluetooth audio device by a first mobile terminal, and replaying the music signal to a user by a loudspeaker; a microphone of the Bluetooth audio equipment receives user voice, a voice transmission channel is established by using an RFCOMM protocol, and the Bluetooth audio equipment sends a voice signal to the first mobile terminal; the first mobile terminal receives a request for communication of the audience, keeps a music transmission channel established under the A2DP protocol and a sound transmission channel established under the RFCOMM protocol, establishes a bidirectional communication channel under the HFP protocol between the first mobile terminal and the Bluetooth audio device, and sends the voice of the audience to the Bluetooth audio device through the bidirectional communication channel and plays the voice to a user through a loudspeaker; meanwhile, a microphone of the bluetooth audio device receives the voice of the user, and the bluetooth audio device sends the voice of the user back to the first mobile terminal by using the bidirectional communication channel under the HFP protocol, and the voice is sent to an opposite-end listener by the first mobile terminal through a cellular network.
Wherein, the voice signals of the channels under different Bluetooth technical protocols are mutually operated.
The mutual operation comprises that music signals under the A2DP protocol are called in the Bluetooth audio equipment and are added into a two-way call channel under the HFP protocol to be sent back to the first mobile terminal.
Further, it is proposed that the bluetooth audio device is connected to two mobile terminals simultaneously by using a Multipoint mode, and a music channel of A2DP protocol, a sound transmission channel of an RFCOMM protocol and a bidirectional communication channel of an HFP protocol are respectively established between the bluetooth audio device and the two mobile terminals.
For the music transmission channel of the above-mentioned A2DP protocol, the music transmission channel may be established using the APTX or HWA protocol instead of the A2DP protocol.
Drawings
FIG. 1 is a schematic diagram of an application scenario using the Bluetooth HFP protocol in the prior art
FIG. 2 is a schematic diagram of a first embodiment of the present invention
FIG. 3 is a schematic view of a second embodiment of the present invention
Detailed Description
As mentioned in the background, the bluetooth alliance SIG defines a plurality of bluetooth protocols, but it is not limited to running multiple protocols simultaneously between devices, which provides an idea for implementing the present invention. Fig. 2 shows a first embodiment of the present invention, a first mobile terminal 1 is provided, the first mobile terminal 1 comprises a first bluetooth module (not shown in the figure), a bluetooth audio device 2 is provided, the bluetooth audio device 2 comprises a second bluetooth module (not shown in the figure), a speaker 21 and a microphone 22; establishing Bluetooth connection between the first mobile terminal 1 and the Bluetooth audio device 2; running a karaoke or webcast application in the mobile terminal 1, the user controlling the application to play music, the application establishing a music transmission channel using the bluetooth A2DP protocol, sending a music signal to the bluetooth audio device 2, the user listening to the music signal played back by the speaker 21, because the A2DP protocol allows the transmission of sound signals of stereo CD sound quality, the user can get the best hearing experience; when listening to high-quality music signals, the user uses the microphone 22 of the Bluetooth audio device 2 to receive the voice of the user, the Bluetooth audio device 2 uses the RFCOMM protocol to establish a sound transmission channel and sends the voice signals to the mobile terminal 1; the mobile terminal 1 receives the voice signal, records the signal or directly broadcasts the signal through the network; the RFCOMM protocol can support the audio signal transmission of double channels with the sampling rate of 48KHz per channel, so that the transmission of high definition can be realized no matter whether the audio signal is a downlink music signal or an uplink voice signal.
When a user carries out karaoke or live broadcasting, an audience can dial the telephone number of the mobile terminal 1 of the user to carry out live interaction, such as discussion with the user or chorus with the user, at the moment, besides maintaining the established music transmission channel of the A2DP protocol and the sound transmission channel of the RFCOMM protocol, a two-way communication channel under the HFP protocol is established for communication between the user and the audience, the voice of the audience is sent to the Bluetooth audio device 2 by the mobile terminal 1 through the two-way communication channel, and the user hears the voice of the audience played back by the loudspeaker 21; meanwhile, the microphone 22 of the bluetooth audio device 2 receives the user's voice, and the bluetooth audio device 2 transmits the user's voice back to the mobile terminal 1 using the bidirectional communication channel under the above HFP protocol, and is transmitted by the mobile terminal 1 to the opposite listener via the cellular network.
In particular, the user can operate the bluetooth audio device 2 to call the A2DP music signal and add the signal into the bidirectional communication channel under the HFP protocol, so that the opposite listener can hear the voice of the user as well as the music, and through the interoperation, the interaction between the signals can be enhanced, and the interactivity between the user and the listener is enhanced. Of course, if the sampling rate of the music signal under the A2DP protocol is not consistent with the sampling rate of the two-way communication channel under the HFP protocol, the music signal under the A2DP protocol needs to be resampled first and then added.
Furthermore, after the music signal, the voice signal collected by the microphone 22 and the voice signal from the listener are mixed in the bluetooth audio device 2, the mixed voice signal is transmitted back to the mobile terminal 1 by using the transmission channel under the RFCOMM protocol; the mobile terminal 1 receives the voice signal, records the signal or directly broadcasts the signal through the network. Wherein, the sound mixing can be performed according to the following formula:
wherein, XL、XRFor left and right channel return signals, Music, respectivelyL、MusicRLeft and right track signals, V, respectively, of a music signal1For user speech signals, V2Alpha is coefficient, alpha is more than or equal to 0 and less than or equal to 1. Of course, because there are different protocols, the sampling rates of the audio signals of the channels are not necessarily the same, and it is necessary to unify the sampling rates of the signals before mixing, for example, for the audio signal of the listener under HFP protocol, if the sampling rate is 8KHz or 16KHz, and the sampling rate of the channel under RFCOMM protocol is 48KHz, the audio signal of the listener under HFP protocol needs to be up-sampled first.
A second embodiment is provided, as shown in fig. 3, and is different from the first embodiment in that a Multipoint (Multipoint connection) manner is adopted, that is, one bluetooth audio device 2 is paired and connected with a first mobile terminal 1 and a second mobile terminal 1 ', wherein a music transmission channel of A2DP protocol and a sound transmission channel under RFCOMM protocol are established between the mobile terminal 1 and the bluetooth audio device 2, and a two-way call channel under HFP protocol is established between the bluetooth audio device 2 and the mobile terminal 1', that is, an audience makes a call to the mobile terminal 1 ', audience voice is sent from the mobile terminal 1' to the bluetooth audio device 2 via the two-way call channel, and a user hears the audience voice played back by a speaker 21; meanwhile, the microphone 22 of the bluetooth audio device 2 receives the user's voice at the same time, and the bluetooth audio device 2 transmits the user's voice back to the mobile terminal 1 'using the two-way communication channel under the above-mentioned RFCOMM protocol, and is transmitted by the mobile terminal 1' to the opposite listener via the cellular network.
Similarly, the user can operate the bluetooth audio device 2 to call up the A2DP music signal and join the two-way communication channel under the HFP protocol, so that the opposite listener can hear not only the user's voice but also music.
Further, similarly to the case of the first embodiment, it is also possible to mix the music signal and the voice signal collected by the microphone 22 and the voice signal from the listener in the bluetooth audio device 2, and then transmit the mixed signal back to the mobile terminal 1 by using the transmission channel under the RFCOMM protocol; the mobile terminal 1 receives the voice signal, records the signal or directly broadcasts the signal through the network.
Claims (11)
1. A music and voice transmission operation method based on Bluetooth is provided, wherein a first mobile terminal (1) is provided, and the first mobile terminal (1) comprises a first Bluetooth module; providing a Bluetooth audio device (2), wherein the Bluetooth audio device (2) comprises a second Bluetooth module, a loudspeaker (21) and a microphone (22);
establishing Bluetooth connection between a first mobile terminal (1) and Bluetooth audio equipment (2);
characterized in that a music transmission channel is established using the bluetooth A2DP protocol, a music signal is sent by the first mobile terminal (1) to the bluetooth audio device (2), and the music signal is played back by the speaker (21) to the user;
a microphone (22) of the Bluetooth audio device (2) receives user voice, a voice transmission channel is established by using an RFCOMM protocol, and the Bluetooth audio device (2) sends a voice signal to the first mobile terminal (1);
the first mobile terminal (1) receives a request for communication of the audience, keeps the music transmission channel established under the A2DP protocol and the sound transmission channel established under the RFCOMM protocol, establishes a two-way communication channel under the HFP protocol between the first mobile terminal (1) and the Bluetooth audio device (2), and sends the voice of the audience to the Bluetooth audio device (2) through the two-way communication channel by the first mobile terminal (1) and plays the voice to the user by a loudspeaker (21);
meanwhile, a microphone (22) of the Bluetooth audio device (2) receives the voice of the user, and the Bluetooth audio device (2) sends the voice of the user back to the first mobile terminal (1) by using the two-way call channel under the HFP protocol and sends the voice to an opposite-end listener through a cellular network by the first mobile terminal (1).
2. The bluetooth-based music and voice transmission operation method of claim 1, wherein the sound signals of the channels under different bluetooth technology protocols are interworked.
3. The bluetooth-based music and speech transmission operation method according to claim 2, wherein the interoperation comprises calling a music signal under A2DP protocol in the bluetooth audio device (2) and joining a two-way communication channel under the HFP protocol to be transmitted back to the first mobile terminal (1).
4. A bluetooth-based music and speech transmission operating method according to one of claims 1 to 3, wherein after mixing music signals with speech signals picked up by the microphone (22) and speech signals from the listener in the bluetooth audio device (2), the mixed signals are transmitted back to the first mobile terminal (1) using the RFCOMM protocol down-channel transmission; the first mobile terminal (1) receives the voice signal.
5. The bluetooth-based music and voice transmission operation method according to claim 4, wherein the mixing is performed according to the following formula:
wherein, XL、XRFor left and right channel return signals, Music, respectivelyL、MusicRLeft and right track signals, V, respectively, of a music signal1For user speech signals, V2Alpha is coefficient, alpha is more than or equal to 0 and less than or equal to 1.
6. A music and voice transmission operation method based on Bluetooth is provided, wherein a first mobile terminal (1) is provided, and the first mobile terminal (1) comprises a first Bluetooth module; providing a Bluetooth audio device (2), wherein the Bluetooth audio device (2) comprises a second Bluetooth module, a loudspeaker (21) and a microphone (22); providing a second mobile terminal (1 '), the second mobile terminal (1') comprising a third bluetooth module;
establishing Bluetooth connection between a first mobile terminal (1) and Bluetooth audio equipment (2);
establishing a Bluetooth connection between a second mobile terminal (1') and a Bluetooth audio device (2);
characterized in that a music transmission channel is established using the bluetooth A2DP protocol, a music signal is sent by the first mobile terminal (1) to the bluetooth audio device (2), and the music signal is played back by the speaker (21) to the user;
a microphone (22) of the Bluetooth audio device (2) receives user voice, establishes a sound transmission channel by using an RFCOMM protocol and sends a voice signal to the first mobile terminal (1);
the second mobile terminal (1 ') receives the request of the audience conversation, keeps the music transmission channel established under the A2DP protocol and the sound transmission channel established under the RFCOMM protocol between the first mobile terminal (1) and the Bluetooth audio device (2), establishes the two-way conversation channel under the HFP protocol between the second mobile terminal (1') and the Bluetooth audio device (2), and the audience voice is sent to the Bluetooth audio device (2 ') from the second mobile terminal (1') through the two-way conversation channel and is played to the user by the loudspeaker (21);
meanwhile, a microphone (22) of the Bluetooth audio device (2) receives the voice of the user, and the Bluetooth audio device (2) sends the voice of the user back to the second mobile terminal (1 ') by using the two-way call channel under the HFP protocol and sends the voice of the user to an opposite-end listener through a cellular network by the second mobile terminal (1').
7. The bluetooth-based music and voice transmission operation method according to claim 6, wherein the sound signals of the channels under different bluetooth technology protocols are interworked.
8. The bluetooth-based music and voice transmission operation method according to claim 7, wherein the interoperation includes calling a music signal under A2DP protocol in the bluetooth audio device (2), joining a two-way call channel under the HFP protocol and transmitting back to the second mobile terminal (1').
9. A bluetooth-based music and speech transmission operating method according to one of claims 6 to 8, wherein after mixing music signals with speech signals picked up by the microphone (22) and speech signals from the listener in the bluetooth audio device (2), the mixed signals are transmitted back to the first mobile terminal (1) using the RFCOMM protocol down-channel transmission; the first mobile terminal (1) receives the voice signal.
10. The bluetooth-based music and voice transmission operation method according to claim 9, wherein the mixing is performed according to the following formula:
wherein, XL、XRFor left and right channel return signals, Music, respectivelyL、MusicRLeft and right track signals, V, respectively, of a music signal1For user speech signals, V2Alpha is coefficient, alpha is more than or equal to 0 and less than or equal to 1.
11. The method of claim 1-10 wherein the music and voice transmission channel is established using APTX or HWA protocol instead of A2DP protocol.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272570A (en) * | 2008-04-28 | 2008-09-24 | 北京中星微电子有限公司 | Method for implementing network karaoke OK and portable equipment |
| US20160086610A1 (en) * | 2013-05-09 | 2016-03-24 | Kt Micro, Inc. | Audio processing device and method and electro-acoustic converting device and method |
| 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 |
| CN106341516A (en) * | 2015-07-06 | 2017-01-18 | 中兴通讯股份有限公司 | Multipoint connection control method and apparatus, terminal and multipoint bluetooth earphone |
| CN207340160U (en) * | 2017-10-26 | 2018-05-08 | 张德明 | A kind of wireless K songs sound system |
-
2018
- 2018-07-01 CN CN201810703778.7A patent/CN110662204B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101272570A (en) * | 2008-04-28 | 2008-09-24 | 北京中星微电子有限公司 | Method for implementing network karaoke OK and portable equipment |
| US20160086610A1 (en) * | 2013-05-09 | 2016-03-24 | Kt Micro, Inc. | Audio processing device and method and electro-acoustic converting device and method |
| CN106341516A (en) * | 2015-07-06 | 2017-01-18 | 中兴通讯股份有限公司 | Multipoint connection control method and apparatus, terminal and multipoint bluetooth earphone |
| 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 |
| CN207340160U (en) * | 2017-10-26 | 2018-05-08 | 张德明 | A kind of wireless K songs sound system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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