CN103200263B - Intelligent terminal and Bluetooth audio frequency playback equipment and exchange method, system - Google Patents
Intelligent terminal and Bluetooth audio frequency playback equipment and exchange method, system Download PDFInfo
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Abstract
The present invention provides a kind of intelligent terminal and Bluetooth audio frequency playback equipment and exchange method, system, and this intelligent terminal comprises: order data generation module, and the order that user inputs is converted into control command and data; Order data coding module, is connected with order data generation module, with data encapsulation, control command is become command packet; Modulating-coding module, is connected with order data coding module, is modulated on sound carrier signal after command packet being encoded, output audio modulation signal; A2DP coding module, is connected with modulating-coding module, and audio modulation signal is carried out the coding based on A2DP agreement, exports A2DP audio code stream; First bluetooth module, is connected with A2DP coding module, by A2DP audio code stream wireless transmission to Bluetooth audio frequency playback equipment. The present invention, when not changing the relevant agreement of bluetooth, utilizes the transmission of the double-direction control data between the protocol realization of A2DP and the AVRCP in blue tooth wireless technology intelligent terminal and Bluetooth audio frequency playback equipment.
Description
Technical Field
The invention belongs to the technical field of electronic communication, relates to a communication method of an intelligent terminal and a Bluetooth audio playing device, and particularly relates to the intelligent terminal, the Bluetooth audio playing device, an interaction method and an interaction system of the intelligent terminal and the Bluetooth audio playing device.
Background
Bluetooth communication has become the standard of many communication products on the market with its low-power consumption and low cost, and intelligent terminal generally all has the bluetooth function. Meanwhile, with the evolution of the bluetooth protocol, the transmission bandwidth of bluetooth communication is higher and higher, and the transmission content thereof is evolved from the earliest low sampling rate monaural headset call to the transmission of high-quality stereo music, so that the bluetooth audio playing device serving as an intelligent terminal partner is also popularized in a large amount.
Currently, bluetooth audio playing devices have a trend of integrating richer functions, for example, bluetooth audio playing devices sold in the market have FM radio reception function, digital music function in a USB storage device or an SD/MMC card device is directly played, and clock and alarm functions are provided. For controlling these functions, a user operates the bluetooth audio playing device by touching and pressing keys on the bluetooth audio playing device or operates the bluetooth audio playing device by using infrared remote control keys, but the operations by these two methods are relatively difficult, for example, setting an FM channel, setting a clock, an alarm clock, etc., and the user experience is poor. Therefore, an application program is installed on the intelligent terminal, bidirectional data communication is achieved through a bluetooth SPP (serial port profile) protocol, that is, functions of setting FM, alarm clock and the like are achieved on the intelligent terminal, then a setting command is transmitted to the bluetooth audio playing device through the SPP protocol, and the bluetooth audio playing device is automatically configured according to the command. However, some existing intelligent terminals adopt a closed strategy for the SPP function, and users cannot install software with the SPP function to perform SPP communication with other common bluetooth audio playing devices.
The prior art (CN 102412877A) realizes transmission of non-audio data via A2DP protocol, but this technology only realizes one-way transmission of data from the smart terminal to the bluetooth audio playing device, and as a control application of the bluetooth audio playing device, it cannot realize the response of the bluetooth audio playing device to the input command. In addition, the implementation of the patent requires that the bluetooth driver of the intelligent terminal is modified to achieve the purpose of transmitting non-audio data, because the standard A2DP bluetooth protocol does not define the way of transmitting non-audio data, and the intelligent terminal cannot modify the underlying bluetooth driver under normal circumstances, unless the administrator authority is acquired, the intelligent terminal, such as a mobile phone or a tablet computer, needs to be subjected to cracking means to achieve the purpose, which is very inconvenient for the ordinary user and has high risk.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide an intelligent terminal and a bluetooth audio playing device, and an interaction method and system thereof, which are used to solve the problem in the prior art how to implement bidirectional data transmission between all intelligent terminals and all bluetooth audio playing devices without using an SPP protocol.
In order to achieve the above objects and other related objects, the present invention provides an intelligent terminal and a bluetooth audio playing device, and an interaction method and system thereof.
The intelligent terminal comprises: the command data generation module is used for converting a command input by a user into a control command and data; the command data coding module is connected with the command data generating module and encapsulates the control command and the data into a command data packet; the modulation coding module is connected with the command data coding module, codes the command data packet and modulates the coded command data packet on a sound carrier signal to output an audio modulation signal; the A2DP coding module is connected with the modulation coding module, codes the audio modulation signal based on an A2DP protocol and outputs an A2DP audio code stream; and the first Bluetooth module is connected with the A2DP coding module and wirelessly transmits the A2DP audio code stream to Bluetooth audio playing equipment.
Preferably, the format of the command data packet includes a packet start flag bit, a packet data, a packet check bit, and a packet end flag bit.
Preferably, the intelligent terminal further comprises a processing module, the processing module is connected to the modulation coding module and the A2DP coding module respectively, mixes the audio modulation signal with the currently played bluetooth stereo music after performing sampling rate conversion, and transmits the mixed audio signal to the A2DP coding module for coding.
Preferably, the intelligent terminal further comprises: the AVRCP decoding module is connected with the first Bluetooth module and is used for decoding the AVRCP data stream received by the first Bluetooth module from the Bluetooth audio playing device to obtain an AVRCP command sequence; and the data decoding module is connected with the AVRCP decoding module and identifies the control command and the data in the AVRCP command sequence according to the flag bit in the data packet format.
The Bluetooth audio playing device comprises: the second Bluetooth module is used for receiving an A2DP audio code stream transmitted wirelessly; the A2DP decoding module is connected with the second Bluetooth module and used for decoding the A2DP audio code stream to obtain an audio signal; the demodulation decoding module is connected with the A2DP decoding module, demodulates the audio signal in real time, identifies the sound signal obtained after demodulation, and judges whether the sound signal contains a command data packet; the command data decoding module is connected with the demodulation decoding module, decodes the command data packet and identifies a control command and data; and the command data execution module is connected with the command data decoding module and is used for executing command actions in the control commands and the data and receiving the data.
Preferably, the bluetooth audio playing device further comprises: the point resistance filter is connected with the demodulation decoding module and used for filtering the command data packet in the sound signal; and the audio output module is connected with the point blocking filter and outputs and plays the sound signal with the command data packet filtered.
Preferably, the bluetooth audio playing device further comprises: the data coding module is used for coding the command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol; and the AVRCP coding module is respectively connected with the data coding module and the second Bluetooth module, codes the AVRCP command sequence based on an AVRCP protocol, and outputs an AVRCP control data stream to the second Bluetooth module for transmission.
The interactive system of the intelligent terminal and the Bluetooth audio playing device comprises the intelligent terminal and the Bluetooth audio playing device which are in communication connection; wherein, intelligent terminal includes: a command data generation module for converting the command input by the user into a control command and data; the command data coding module is connected with the command data generating module and used for packaging the control command and the data into a command data packet; the modulation coding module is connected with the command data coding module, modulates the command data packet on a sound carrier signal after coding, and outputs an audio modulation signal; the A2DP coding module is connected with the modulation coding module, codes the audio modulation signal based on an A2DP protocol and outputs an A2DP audio code stream; the first Bluetooth module is connected with the A2DP encoding module and wirelessly transmits the A2DP audio code stream to Bluetooth audio playing equipment; the AVRCP decoding module is connected with the first Bluetooth module and used for decoding the AVRCP control data stream received by the first Bluetooth module from the Bluetooth audio playing device to obtain an AVRCP command sequence; the data decoding module is connected with the AVRCP decoding module and identifies the control command and the data in the AVRCP command sequence according to the flag bit in the data packet format; the Bluetooth audio playing device comprises: the second Bluetooth module receives an A2DP audio code stream transmitted wirelessly; the A2DP decoding module is connected with the second Bluetooth module, decodes the A2DP audio code stream and obtains an audio signal; the demodulation decoding module is connected with the A2DP decoding module, demodulates the audio signal in real time, identifies the sound signal obtained after demodulation and judges whether the sound signal contains a command data packet or not; a command data decoding module connected with the demodulation decoding module, decoding the command data packet and identifying a control command and data; a command data executing module connected with the command data decoding module and used for executing command actions in the control commands and the data and receiving the data; the data coding module is used for coding the command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP coding module is connected with the data coding module and the second Bluetooth module respectively, codes the AVRCP command sequence based on an AVRCP protocol and outputs AVRCP control data stream to the AVRCP coding module sent by the second Bluetooth module; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol.
Preferably, the intelligent terminal further comprises a processing module, the processing module is connected to the modulation coding module and the A2DP coding module respectively, mixes the audio modulation signal with the currently played bluetooth stereo music after performing sampling rate conversion, and transmits the mixed audio signal to the A2DP coding module for coding.
Preferably, the bluetooth audio playing device further comprises: the point resistance filter is connected with the demodulation decoding module and used for filtering the command data packet in the sound signal; and the audio output module is connected with the point blocking filter and outputs and plays the sound signal with the command data packet filtered.
The interaction method comprises a process that the intelligent terminal sends a control command and data to the Bluetooth audio playing device, and specifically comprises the following steps:
converting a command input by a user through an intelligent terminal interface into a control command and data;
encapsulating the control command and the data into a command data packet;
the command data packet is modulated on a sound carrier signal after being coded, and an audio modulation signal is output;
coding the audio modulation signal based on an A2DP protocol, and outputting an A2DP audio code stream;
and wirelessly transmitting the A2DP audio code stream to Bluetooth audio playing equipment.
Preferably, the interactive method further includes a process of the bluetooth audio playing device receiving a control command and data sent from the intelligent terminal, and specifically includes:
receiving an A2DP audio code stream transmitted wirelessly;
decoding the A2DP audio code stream to obtain an audio signal;
demodulating the audio signal in real time, identifying a sound signal obtained after demodulation, and judging whether the sound signal contains a command data packet or not;
decoding the command data packet to identify a control command and data;
and executing command actions in the control commands and the data and receiving the data.
Preferably, the audio modulation signal is subjected to sampling rate conversion and then mixed with currently played bluetooth stereo music, and the mixed audio signal is subjected to encoding based on an A2DP protocol, and an A2DP audio code stream is output.
Preferably, the process of the bluetooth audio playing device receiving the control command and data sent from the intelligent terminal further includes:
filtering command data packets in the sound signals;
and outputting the sound signal of which the command data packet is filtered.
Preferably, the interaction method includes a process in which the bluetooth audio playing device sends a control command and data to the intelligent terminal, and specifically includes:
coding a command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol;
and encoding the AVRCP command sequence based on an AVRCP protocol, and outputting an AVRCP control data stream to the second Bluetooth module for transmission.
Preferably, the interaction method includes a process in which the intelligent terminal receives a control command and data from the bluetooth audio playing device, and specifically includes:
decoding the AVRCP control data stream from the Bluetooth audio playing device to obtain an AVRCP command sequence;
and identifying the acquisition control command and the data in the AVRCP command sequence according to the flag bit in the data packet format.
As described above, the intelligent terminal, the bluetooth audio playing device, the interaction method and the interaction system thereof according to the present invention have the following advantages:
under the condition of not changing the related Bluetooth protocol, the invention realizes the transmission of two-way control data between the intelligent terminal and the Bluetooth audio playing device by utilizing the A2DP and AVRCP protocols in the Bluetooth wireless technology.
Drawings
Fig. 1 is a schematic structural diagram of an intelligent terminal according to the present invention.
Fig. 2 is a schematic structural diagram of a bluetooth audio playing device according to the present invention.
Fig. 3 is a schematic structural diagram of an interactive system between an intelligent terminal and a bluetooth audio playing device according to the present invention.
Fig. 4 is a schematic flow chart illustrating a process of sending a control command and data to a bluetooth audio playing device by an intelligent terminal according to the present invention.
Fig. 5 is a schematic flow chart illustrating a process of sending a control command and data to an intelligent terminal by the bluetooth audio playing device according to the present invention.
Description of the element reference numerals
100. 310 intelligent terminal
101. 311 command data generating module
102. 312 command data encoding module
103. 313 modulation coding module
104. 314A2DP encoding module
105. 315 first bluetooth module
106. 316 processing module
107. 317AVRCP decoding module
108. 318 data decoding module
200. 320 bluetooth audio playing device
201. 321 second Bluetooth module
202. 322A2DP decoding module
203. 323 demodulation decoding module
204. 324 command data decoding module
205. 325 Command data execution Module
206. 326 point resistance filter
207. 327 Audio output Module
208. 328 data encoding module
209. 329AVRCP coding module
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to the attached drawings. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The present invention will be described in detail with reference to the following examples and drawings.
Examples
The present embodiment provides an intelligent terminal, as shown in fig. 1, the intelligent terminal 100 includes: the bluetooth communication device comprises a command data generating module 101, a command data encoding module 102, a modulation encoding module 103, an A2DP encoding module 104 and a first bluetooth module 105.
The command data generation module 101 converts a command input by a user into a control command and data, wherein the control command and data are non-audio control data.
The command data encoding module 102 is connected to the command data generating module 101, and encapsulates the control command and data into a command data packet; the format of the command data packet comprises a data packet start flag bit, data packet data, a data packet check bit and a data packet end flag bit.
The modulation coding module 103 is connected to the command data coding module 102, and modulates the command data packet on a sound carrier signal after coding, and outputs an audio modulation signal. Specifically, since the amount of data to be transmitted is not large, mainly a control command and a small amount of data, the modulation and coding module 103 may modulate the data packet on two carrier frequencies f1 and f2 in a simple Frequency-shift keying (FSK) manner, where the two frequencies f1 and f2 are between 16KHz and 20KHz for two reasons: firstly, the frequency range of 16KHz to 20KHz is beyond the human auditory organ perception frequency, and the frequency section can only be perceived by human bodies, skull bones and skull bones. In the bluetooth audio playing device, a point-blocking filter is designed for filtering out a carrier signal, but considering implementation cost, the point-blocking filter cannot filter out energy of all modulated waves (i.e. the audio modulated signals), but the modulated waves with most of energy filtered out are less likely to be perceived by human ears under the condition that the modulated waves fall into an ultra-high frequency band. Secondly, a normal A2DP encoder (i.e. the A2DP encoding module) has certain requirements on the cut-off band, and too high frequency signals are directly removed when encoded by the A2DP encoder and cannot be transmitted.
The A2DP encoding module 104 is connected to the modulation encoding module 103, and performs encoding based on an A2DP protocol on the audio modulation signal, and outputs an A2DP audio code stream.
The first Bluetooth module 105 is connected with the A2DP encoding module, and wirelessly transmits the A2DP audio code stream to Bluetooth audio playing equipment.
Further, the intelligent terminal 100 may further include a processing module 106, where the processing module 106 is connected to the modulation and coding module 103 and the A2DP coding module 104, respectively, mixes the audio modulation signal after performing sample rate conversion with currently played bluetooth stereo music, and transmits the mixed audio signal to the A2DP coding module for coding. The processing module 106 is used to consider that when the user operates the intelligent terminal to control the bluetooth audio playing device, the intelligent terminal may transmit the stereo music data stream via the A2DP protocol at the same time, and in order to not interrupt the current music transmission and provide the user with better user experience, the modulated signal may be directly superimposed on the currently played audio data in the time domain after being processed (for example, sampling rate conversion).
Further, the intelligent terminal 100 further includes: AVRCP decoding module 107, data decoding module 108.
The AVRCP decoding module 107 is connected to the first bluetooth module 105, and decodes the AVRCP control data stream received by the first bluetooth module from the bluetooth audio playing device to obtain an AVRCP command sequence;
the data decoding module 108 is connected to the AVRCP decoding module 107, and identifies the control command and data in the AVRCP command sequence according to the flag bit in the data packet format.
As shown in fig. 2, the bluetooth audio playing apparatus 200 further includes: a second bluetooth module 201, an A2DP decoding module 202, a demodulation decoding module 203, a command data decoding module 204, and a command data executing module 205.
The second bluetooth module 201 receives an A2DP audio code stream transmitted wirelessly.
The A2DP decoding module 202 is connected to the second bluetooth module 201, and decodes the A2DP audio code stream to obtain an audio signal.
The demodulation decoding module 203 is connected to the A2DP decoding module 202, and demodulates the audio signal in real time, and identifies the sound signal obtained after demodulation, and determines whether the sound signal contains a command data packet.
The command data decoding module 204 is connected to the demodulation decoding module 203, and decodes the command data packet to identify a control command and data.
The command data executing module 205 is connected to the command data decoding module 204, and executes command actions in the control commands and data and receives data.
Further, the bluetooth audio playing device 200 further includes: a point blocking filter 206 and an audio output module 207.
The point blocking filter 206 is connected to the demodulation and decoding module 203 and the audio output module 207, respectively, and filters the command data packet in the sound signal to the audio output module. That is, if the data signal is found to exist in the audio signal, the dotting filter (notchfilter) is started to filter the data signal in the audio, and the data signal is output by the sound output device, and if the data signal is not found, the audio decoded by A2DP can be directly output to the sound output device.
The audio output module 207 is connected to the dotting filter 206, and outputs and plays the sound signal from which the command data packet is filtered.
Further, the bluetooth audio playing device 200 further includes: a data coding module 208 and an AVRCP coding module 209.
The data encoding module 208 encodes the command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol.
Specifically, the bluetooth AVRCP protocol is defined such that, for example, a device side of the bluetooth audio playing device may send commands such as start playing, stop playing, previous song, next song, and the like to the intelligent terminal, and after receiving the commands, the intelligent terminal defines playing and stopping of songs or playing of previous song and next song according to the AVRCP protocol. The Bluetooth audio playing device carries out certain sort combination on the control words specified by the AVRCP protocol, codes the combined sequence into different response and control data commands, and after receiving the AVRCP command returned by the Bluetooth audio playing device, the intelligent terminal decodes the AVRCP command to obtain response data or control data. For example: for example, on a smart terminal, which can implement four functions of PLAY (PLAY), STOP (STOP), next song (nextsog), and previous song (PRESONG) according to the AVRCP protocol, the bluetooth audio playing device now defines the following abbreviations for these 4 AVRCP commands: PLAY = a, STOP = B, nextsog = C, PRESONG = D. Then by arranging and combining the sequences of ABCD, command start bits, command data, command check data, and command end bits can be defined. Equivalent to a bluetooth audio playback device encoding a combination of 4 commands supported by AVRCP into a new command or data format, while canceling the original AVRCP definition. For example, the AVRCP command sequence defines that "AD" is encoded as command start bits and "DA" is encoded as command end bits. The other command data and command check data do not occur in both sequences. Such as command data "AAA" = play; "BBB" = stop; "CCC" = nextsong; "DDD" = presong; such as command check data "AAB" = command reception ACK; "AAC" = command retransmission, etc.
The AVRCP encoding module 209 is connected to the data encoding module 208 and the second bluetooth module 201, respectively, encodes the AVRCP command sequence based on an AVRCP protocol, and outputs an AVRCP control data stream to the second bluetooth module for transmission.
As shown in fig. 3, the interactive system 300 of the intelligent terminal and the bluetooth audio playing device includes an intelligent terminal 310 and a bluetooth audio playing device 320 that are connected in a communication manner.
The smart terminal 310 includes: a command data generating module 311, a command data encoding module 312, a modulation encoding module 313, an A2DP encoding module 314, and a first Bluetooth module 315. The bluetooth audio playback device 320 includes: a second bluetooth module 321, an A2DP decoding module 322, a demodulation decoding module 323, a command data decoding module 324, and a command data executing module 325.
The command data generating module 311 converts a command input by a user into a control command and data.
The command data encoding module 312 is connected to the command data generating module 311, and encapsulates the control command and data into a command data packet; the format of the data packet comprises a data packet starting zone bit, data packet data, a data packet check bit and a data packet ending zone bit.
The modulation and coding module 313 is connected to the command data coding module 312, and modulates the command data packet on a sound carrier signal after coding, and outputs an audio modulation signal. Specifically, the modulation and coding module 313 may modulate the data packet on two carrier frequencies, i.e., f1 and f2, by using Frequency-shift keying (FSK).
Further, the intelligent terminal 310 may further include a processing module 316, where the processing module 316 is connected to the modulation and coding module 313 and the A2DP coding module 314, respectively, mixes the audio modulation signal with the currently played bluetooth stereo music after performing sample rate conversion, and transmits the mixed audio signal to the A2DP coding module for coding. The processing module 316 is adopted to consider that when the user operates the intelligent terminal to control the bluetooth audio playing device, the intelligent terminal may transmit the stereo music data stream via the A2DP protocol at the same time, in order to not interrupt the current music transmission and provide the client with better user experience, the modulated signal may be directly superimposed on the currently played audio data in the time domain after a certain processing (e.g. sampling rate conversion).
The A2DP encoding module 314 is connected to the modulation encoding module 313, and performs encoding based on the A2DP protocol on the audio modulation signal, and outputs an A2DP audio code stream.
The first bluetooth module 315 is connected to the A2DP encoding module, and wirelessly transmits the A2DP audio code stream to the bluetooth audio playing device 320.
The second bluetooth module 321 receives the A2DP audio code stream transmitted wirelessly.
The A2DP decoding module 322 is connected to the second bluetooth module 321, and decodes the A2DP audio code stream to obtain an audio signal.
The demodulation decoding module 323 is connected to the A2DP decoding module 322, and demodulates the audio signal in real time, and identifies the sound signal obtained after demodulation, and determines whether the sound signal contains a command data packet.
Further, the bluetooth audio playing device 320 further includes: a point blocking filter 326 and an audio output module 327. The point blocking filter 326 is connected to the demodulation and decoding module 323, and filters the command data packet in the sound signal. That is, if the data signal is found to exist in the audio signal, a dot blocking filter (notchfilter) is started to filter the data signal in the audio, and the filtered audio signal is output by the sound output device, and if the data signal is not found, the audio signal decoded by A2DP can be directly output to the sound output device.
The command data decoding module 324 is connected to the demodulation decoding module 323, and decodes the command data packet to identify the control command and data.
The command data execution module 325 is connected to the command data decoding module 324, and executes command actions and received data in the control commands and data.
Further, the bluetooth audio playing device 320 further includes: a data encoding module 328, and an AVRCP encoding module 329. The intelligent terminal 310 further includes: AVRCP decode module 317, data decode module 318.
The data encoding module 328 encodes the command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol.
The AVRCP encoding module 329 is connected to the data encoding module 328 and the second bluetooth module 321, respectively, and encodes the AVRCP command sequence based on an AVRCP protocol, and outputs an AVRCP control data stream to the second bluetooth module 321 for transmission.
The AVRCP decoding module 317 is connected to the first bluetooth module 315, and decodes the AVRCP control data stream received by the first bluetooth module 315 from the bluetooth audio playback device 320 to obtain an AVRCP command sequence.
The data decoding module 318 is connected to the AVRCP decoding module 317, and identifies the control command and data in the AVRCP command sequence according to the flag bit in the data packet format.
As shown in fig. 4, the interactive method includes a process S410 in which the intelligent terminal sends a control command and data to the bluetooth audio playing device, and a process S420 in which the bluetooth audio playing device receives the control command and data sent from the intelligent terminal.
Specifically, the process S410 of the intelligent terminal sending the control command and the data to the bluetooth audio playing device includes the following steps:
s411, converting a command input by a user through an intelligent terminal interface into a control command and data;
s412, encapsulating the control command and the data into a command data packet;
s413, encoding the command data packet and modulating the encoded command data packet on a sound carrier signal, and outputting an audio modulation signal;
further, the specific implementation manner of step S413 may be: the data packets are modulated on two carrier frequencies f1 and f2 in a frequency shift keying manner. In addition, the audio modulation signal can be mixed with currently played Bluetooth stereo music after being subjected to sampling rate conversion, and the mixed audio signal is subjected to encoding based on an A2DP protocol; steps S412-S413 are implemented at the application layer of the intelligent terminal;
s414, coding the audio modulation signal based on an A2DP protocol, and outputting an A2DP audio code stream; the step is realized in a Bluetooth driving layer;
s415, the A2DP audio code stream is wirelessly transmitted to Bluetooth audio playing equipment.
Specifically, the process S420 of the bluetooth audio playing device receiving the control command and data sent from the intelligent terminal includes the following steps:
s421 receiving the A2DP audio code stream transmitted by wireless;
s422, decoding the A2DP audio code stream to obtain an audio signal;
s423, demodulating the audio signal in real time, identifying the sound signal obtained after demodulation, and judging whether the sound signal contains a command data packet;
further, step S423 may further include: filtering the command data packet in the sound signal, and outputting and playing the sound signal with the command data packet removed;
s424, decoding the command data packet, and identifying a control command and data;
s425 executes command actions in the control commands and data and receives data.
As shown in fig. 5, the interactive method includes a process S510 in which the bluetooth audio playing device sends a control command and data to the intelligent terminal, and a process S520 in which the intelligent terminal receives the control command and data from the bluetooth audio playing device.
Specifically, the process S510 of the bluetooth audio playing device sending a control command and data to the smart terminal includes the following steps:
s511, encoding the command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol;
s512, the AVRCP command sequence is encoded based on an AVRCP protocol, and an AVRCP control data stream is output to the second Bluetooth module for transmission.
Specifically, the process S520 of the intelligent terminal receiving the control command and data from the bluetooth audio playing device includes the following steps:
s521, decoding the AVRCP control data stream from the Bluetooth audio playing device to obtain an AVRCP command sequence; this step S521 is implemented in the bluetooth driver layer of the intelligent terminal;
s522, identifying the control command and the data in the AVRCP command sequence according to the flag bit in the data packet format. This step S522 is implemented at the application layer of the smart terminal.
The invention utilizes two protocols A2DP and AVRCP necessary in Bluetooth stereo audio transmission to realize command control of the intelligent terminal to the Bluetooth audio playing device and data response of the Bluetooth audio playing device to the intelligent terminal. The audio data stream direction based on A2DP flows from the intelligent terminal to the Bluetooth audio playing device; AVRCP is audio/video remote control configuration protocol in Bluetooth, and the data flow direction is sent from the Bluetooth audio playing device back to the intelligent terminal.
Under the condition of not changing the related Bluetooth protocol, the invention realizes the transmission of bidirectional control data between the intelligent terminal and the Bluetooth Audio playing device by utilizing the A2DP (advanced Audio distribution protocol) and AVRCP (Audio/video remote control protocol) protocols in the Bluetooth wireless technology.
The invention has the characteristics that: on the intelligent terminal, the control data signals to be transmitted are modulated onto the audio signals through a modulation technology, the audio signals are transmitted onto the Bluetooth audio playing device through an A2DP protocol, and the control data are obtained after the Bluetooth audio playing device demodulates.
On the Bluetooth audio playing device, certain coding combination is carried out on commands provided by an AVRCP protocol, a combined command sequence is defined as new control commands and data, the new control commands and data to be transmitted are coded into the AVRCP sequence, the AVRCP protocol is used for transmitting the new control commands and data to the intelligent terminal, and the intelligent terminal decodes the sequence to realize data transmission from the Bluetooth audio playing device to the intelligent terminal.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (14)
1. An intelligent terminal, characterized in that, intelligent terminal includes:
the command data generation module is used for converting a command input by a user into a control command and data;
the command data coding module is connected with the command data generating module and encapsulates the control command and the data into a command data packet;
the modulation coding module is connected with the command data coding module, codes the command data packet and modulates the coded command data packet on a sound carrier signal to output an audio modulation signal; the method specifically comprises the following steps: the command data packet is modulated on two carrier frequencies of f1 and f2 after being coded, and the two frequencies of f1 and f2 are between 16KHz and 20 KHz;
the A2DP coding module is connected with the modulation coding module, codes the audio modulation signal based on an A2DP protocol and outputs an A2DP audio code stream;
and the first Bluetooth module is connected with the A2DP coding module and wirelessly transmits the A2DP audio code stream to Bluetooth audio playing equipment.
2. The intelligent terminal of claim 1, wherein: the format of the command data packet comprises a data packet start flag bit, data packet data, a data packet check bit and a data packet end flag bit.
3. The intelligent terminal of claim 1, wherein: the intelligent terminal also comprises a processing module, the processing module is respectively connected with the modulation coding module and the A2DP coding module, the audio modulation signal is mixed with the currently played Bluetooth stereo music after the sampling rate conversion, and the mixed audio signal is transmitted to the A2DP coding module for coding.
4. The intelligent terminal of claim 1, wherein: the intelligent terminal further comprises:
the AVRCP decoding module is connected with the first Bluetooth module and is used for decoding the AVRCP control data stream received by the first Bluetooth module from the Bluetooth audio playing device to obtain an AVRCP command sequence; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol;
and the data decoding module is connected with the AVRCP decoding module and identifies the control command and the data in the AVRCP command sequence.
5. A bluetooth audio playback device, characterized in that the bluetooth audio playback device comprises:
the second Bluetooth module is used for receiving an A2DP audio code stream transmitted wirelessly;
the A2DP decoding module is connected with the second Bluetooth module and used for decoding the A2DP audio code stream to obtain an audio signal;
the demodulation decoding module is connected with the A2DP decoding module, demodulates the audio signal in real time, identifies the sound signal obtained after demodulation, and judges whether the sound signal contains a command data packet; the command data packet is a data packet which is modulated on two carrier frequencies of f1 and f2 after being coded, and the two frequencies of f1 and f2 are between 16KHz and 20 KHz;
the command data decoding module is connected with the demodulation decoding module, decodes the data packet and identifies a control command and data;
and the command data execution module is connected with the command data decoding module and is used for executing command actions in the control commands and the data and receiving the data.
6. The Bluetooth audio playback device according to claim 5, wherein the Bluetooth audio playback device further comprises:
the point resistance filter is connected with the demodulation decoding module and used for filtering the command data packet in the sound signal;
and the audio output module is connected with the point blocking filter and outputs and plays the sound signal with the command data packet filtered.
7. The Bluetooth audio playback device according to claim 5, wherein the Bluetooth audio playback device further comprises:
the data coding module is used for coding the command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol;
and the AVRCP coding module is respectively connected with the data coding module and the second Bluetooth module, codes the AVRCP command sequence based on an AVRCP protocol, and outputs an AVRCP control data stream to the second Bluetooth module for transmission.
8. The utility model provides an interactive system of intelligent terminal and bluetooth audio playback equipment which characterized in that: the interactive system of the intelligent terminal and the Bluetooth audio playing device comprises the intelligent terminal and the Bluetooth audio playing device which are in communication connection; wherein,
the intelligent terminal comprises: a command data generation module for converting the command input by the user into a control command and data; the command data coding module is connected with the command data generating module and used for packaging the control command and the data into a command data packet; the modulation coding module is connected with the command data coding module, modulates the command data packet on a sound carrier signal after coding, and outputs an audio modulation signal; the modulation coding module codes the command data packet and modulates the command data packet on two carrier frequencies of f1 and f2, wherein the two frequencies of f1 and f2 are between 16KHz and 20 KHz; the A2DP coding module is connected with the modulation coding module, codes the audio modulation signal based on an A2DP protocol and outputs an A2DP audio code stream; the first Bluetooth module is connected with the A2DP encoding module and wirelessly transmits the A2DP audio code stream to Bluetooth audio playing equipment; the AVRCP decoding module is connected with the first Bluetooth module and used for decoding the AVRCP control data stream received by the first Bluetooth module from the Bluetooth audio playing device to obtain an AVRCP command sequence; the data decoding module is connected with the AVRCP decoding module and identifies the control command and the data in the AVRCP command sequence;
the Bluetooth audio playing device comprises: the second Bluetooth module receives an A2DP audio code stream transmitted wirelessly; the A2DP decoding module is connected with the second Bluetooth module, decodes the A2DP audio code stream and obtains an audio signal; the demodulation decoding module is connected with the A2DP decoding module, demodulates the audio signal in real time, identifies the sound signal obtained after demodulation and judges whether the sound signal contains a command data packet or not; the command data packet is a data packet which is modulated on two carrier frequencies of f1 and f2 after being coded, and the two frequencies of f1 and f2 are between 16KHz and 20 KHz; a command data decoding module connected with the demodulation decoding module, decoding the command data packet and identifying a control command and data; a command data executing module connected with the command data decoding module and used for executing command actions in the control commands and the data and receiving the data; the data coding module is used for coding the command or data to be sent to the intelligent terminal into an AVRCP command sequence; the AVRCP coding module is connected with the data coding module and the second Bluetooth module respectively, codes the AVRCP command sequence based on an AVRCP protocol and outputs AVRCP control data stream to the AVRCP coding module sent by the second Bluetooth module; the AVRCP command sequence is a sequencing combination of control words specified by an AVRCP protocol.
9. The interactive system of the intelligent terminal and the Bluetooth audio playing device according to claim 8, wherein: the intelligent terminal also comprises a processing module, the processing module is respectively connected with the modulation coding module and the A2DP coding module, the audio modulation signal is mixed with the currently played Bluetooth stereo music after the sampling rate conversion, and the mixed audio signal is transmitted to the A2DP coding module for coding.
10. The interactive system of the intelligent terminal and the Bluetooth audio playing device according to claim 8, wherein: the bluetooth audio playback device further includes:
the point resistance filter is connected with the demodulation decoding module and used for filtering the command data packet in the sound signal;
and the audio output module is connected with the point blocking filter and outputs and plays the sound signal with the command data packet filtered.
11. An interactive method of an intelligent terminal and Bluetooth audio playing equipment is characterized in that: the interaction method comprises a process that the intelligent terminal sends a control command and data to the Bluetooth audio playing device, and specifically comprises the following steps:
converting a command input by a user through an intelligent terminal interface into a control command and data;
encapsulating the control command and the data into a command data packet;
the command data packet is modulated on a sound carrier signal after being coded, and an audio modulation signal is output; the method specifically comprises the following steps: the command data packet is modulated on two carrier frequencies of f1 and f2 after being coded, and the two frequencies of f1 and f2 are between 16KHz and 20 KHz;
coding the audio modulation signal based on an A2DP protocol, and outputting an A2DP audio code stream;
and wirelessly transmitting the A2DP audio code stream to Bluetooth audio playing equipment.
12. The interaction method of the intelligent terminal and the Bluetooth audio playing device according to claim 11, wherein: the interactive method further comprises a process that the Bluetooth audio playing device receives a control command and data sent by the intelligent terminal, and specifically comprises the following steps:
receiving an A2DP audio code stream transmitted wirelessly;
decoding the A2DP audio code stream to obtain an audio signal;
demodulating the audio signal in real time, identifying a sound signal obtained after demodulation, and judging whether the sound signal contains a command data packet or not; the command data packet is a data packet which is modulated on two carrier frequencies of f1 and f2 after being coded, and the two frequencies of f1 and f2 are between 16KHz and 20 KHz;
decoding the command data packet to identify a control command and data;
and executing command actions in the control commands and the data and receiving the data.
13. The interaction method of the intelligent terminal and the Bluetooth audio playing device according to claim 11, wherein: and carrying out sampling rate conversion on the audio modulation signal, mixing the audio modulation signal with the currently played Bluetooth stereo music, carrying out coding based on an A2DP protocol on the mixed audio signal, and outputting an A2DP audio code stream.
14. The method as claimed in claim 11, wherein the step of the bluetooth audio playback device receiving the control command and data from the smart terminal further comprises:
filtering command data packets in the sound signals;
and outputting the sound signal of which the command data packet is filtered.
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