CN104092825A - Bluetooth voice control method and device and intelligent terminal - Google Patents
Bluetooth voice control method and device and intelligent terminal Download PDFInfo
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Abstract
The invention relates to the field of personal mobility technology and vehicle-mounted Bluetooth technology and discloses a Bluetooth voice control method and device and an intelligent terminal. The method comprises the steps of conducting Bluetooth matching and connection with a peripheral, sending a request signal to the peripheral, attempting connection with an RFCOMM channel set by the peripheral, receiving an RFCOMM channel establishment confirmation signal returned by the peripheral, establishing a Socket port based on an RFCOMM, receiving a VTCP data packet transmitted from the peripheral through the Socket port, recognizing a voice instruction in the data packet and converting the voice instruction into a specific control instruction for operation of the intelligent terminal. According to the Bluetooth voice control method, device and intelligent terminal, a VTCP is adopted to transmit 16-KHz voice signals through the RFCOMM channel, so that the voice recognition rate is effectively increased; furthermore, efficient and accurate voice control over the intelligent terminal is achieved, and safety and convenience in the process of controlling the intelligent terminal by a user are guaranteed to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of personal mobility and vehicle-mounted Bluetooth, and particularly relates to a Bluetooth voice control method, a Bluetooth voice control device and an intelligent terminal.
Background
With the increasing popularization of smart phones, more and more mobile internet applications can enable people to obtain more convenience and enjoyment when people drive. However, when a driver drives a car, the operation of the mobile phone is a behavior that endangers driving safety, so that the driver mainly relies on a bluetooth mode to wirelessly use some basic functions of the mobile phone when driving at present. The current vehicle-mounted Bluetooth equipment mainly comprises a hand-free telephone, a Bluetooth headset and the like, and the working principle of the vehicle-mounted Bluetooth equipment is that the vehicle-mounted Bluetooth equipment is connected with a mobile phone through a standard Bluetooth protocol, and the mobile phone is controlled to answer the call and play music in a wireless mode. However, due to the limitation of the device and the protocol, the existing bluetooth mode cannot control other functions on the mobile phone, for example, it is difficult to realize voice control of the mobile phone through bluetooth in the prior art.
The most key problem of voice control is to accurately recognize the voice command of a user, and the traditional method for performing voice recognition by using a Bluetooth peripheral comprises two methods: recognizing by using a DSP (digital signal processor) built in the Bluetooth peripheral; or the voice signal is transmitted back to the mobile phone by using a bluetooth HSP (HeadSet Profile) protocol, and the mobile phone performs voice recognition. However, due to the limitations of size, cost and energy, the processing capacity and storage capacity of the DSP of the bluetooth peripheral are very limited, the recognition speed and complexity are very limited, and generally, only simple command word recognition (such as "yes" or "no") can be performed, and thus complicated voice control is difficult to implement. When the second mode is adopted, the HSP protocol is specially used for transmitting bidirectional and low-delay voice, the application is mainly only suitable for telephone conversation and is limited by the bandwidth of a Bluetooth channel, and the audio sampling rate is only 8 KHz; only from the newer HSP1.6, the SIG group started to specify a WBS (wideband speech) at 16KHz, but most handsets have not been able to support WBS. Thus, there are two main drawbacks to speech recognition using the HSP protocol: firstly, most mobile phones only support 8KHz sampling, and the identification accuracy is low; second, some cell phones do not support HSP backhaul speech and even do not allow speech recognition.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is how to enhance the voice recognition capability of the Bluetooth equipment.
In order to solve the technical problem, the invention provides a bluetooth voice control method, which comprises the following steps:
performing Bluetooth pairing connection with an external device;
sending a request signal to the peripheral equipment, and trying to connect an RFCOMM channel established by the peripheral equipment;
receiving a confirmation RFCOMM channel establishment signal returned by the peripheral equipment, and establishing a Socket port based on the RFCOMM;
receiving a VTCP data packet transmitted from a peripheral through the Socket port;
and recognizing the voice command in the data packet, and converting the voice command into a specific control command to operate the intelligent terminal.
Preferably, in the method, after the Socket port is established, the method further includes the steps of:
opening a microphone of the external device to receive user voice, and packaging and compressing the audio signal converted by the ADC according to a format of 16KHz and 16 bit;
receiving a data packet transmitted by peripheral equipment in a packaging way through a Socket port;
checking the integrity and continuity of the data packet;
preprocessing the voice data in the data packet by noise suppression, echo cancellation and human voice detection;
performing voice recognition and semantic understanding on the preprocessed voice data;
and sending the final recognition result back to a processor of the intelligent terminal in a command form, and executing corresponding processing operation.
Preferably, the method further comprises, before turning on the peripheral microphone, the steps of:
the intelligent terminal is ready for starting and initiates a voice recognition request to the peripheral;
after receiving the request, the peripheral plays a prompt tone;
after the prompt tone is finished, the peripheral device turns on the microphone.
Preferably, the method further comprises the following steps:
and when the processing operation preparation is finished, sending a voice recognition finishing signal to the peripheral equipment, and closing the microphone by the peripheral equipment according to the voice recognition finishing signal.
Preferably, in the method, the preparation of the intelligent terminal for starting includes the steps of:
and establishing a wireless link with the remote controller through a wireless interface, receiving the remote control operation of the remote controller, and starting a voice control process.
Preferably, the external device is a vehicle-mounted device, a headset and/or a wearable device; the intelligent terminal is a mobile terminal, an intelligent household appliance, a PC device, an embedded system and/or a wearable intelligent device.
On the other hand, the invention also provides a bluetooth voice control device, which comprises:
the Bluetooth pairing module is used for carrying out Bluetooth pairing connection with the peripheral equipment;
the request module is used for sending a request signal to the peripheral equipment and trying to connect an RFCOMM channel formulated by the peripheral equipment;
the channel module is used for receiving a confirmation RFCOMM channel establishment signal returned by the peripheral equipment and establishing a Socket port based on the RFCOMM;
the receiving module is used for receiving the VTCP data packet transmitted by the peripheral equipment through the Socket port;
and the recognition processing module is used for recognizing the voice command in the data packet and converting the voice command into a specific control command to operate the intelligent terminal.
Preferably, the identification processing module further comprises:
the checking module is used for checking the integrity and the continuity of the data packet;
the preprocessing module is used for preprocessing the voice data in the data packet by noise suppression, echo cancellation and human voice detection;
the semantic processing module is used for carrying out voice recognition and semantic understanding on the preprocessed voice data;
and the execution module is used for sending the final recognition result back to the processor of the intelligent terminal in a command form and executing corresponding processing operation.
Preferably, the apparatus further comprises:
the starting module is used for initiating a voice recognition request to the peripheral equipment when the starting preparation is ready, the peripheral equipment plays a prompt tone according to the request, and the peripheral equipment opens the microphone after the prompt tone is finished;
and the ending module is used for sending a voice recognition ending signal to the peripheral equipment when the processing operation preparation is finished, and the peripheral equipment closes the microphone according to the voice recognition ending signal.
Preferably, the external device is a vehicle-mounted device, a headset and/or a wearable device; the intelligent terminal is a mobile terminal, an intelligent household appliance, a PC device, an embedded system and/or a wearable intelligent device.
In another aspect, the present invention is also directed to an intelligent terminal, including: the apparatus as described above, and an interface module and at least one functional module; wherein,
the interface module establishes a wireless link with a remote controller and receives remote control operation of the remote controller;
and the functional module receives the control instruction provided by the identification processing module to complete the corresponding operation function.
Preferably, the interface module is an infrared interface or a bluetooth interface.
According to the invention, by improving the mode of returning voice from the Bluetooth peripheral equipment and adopting the VTCP protocol to transmit 16KHz voice signals through the RFCOMM channel, the voice data with high sampling rate effectively improves the voice recognition rate, so that the high-efficiency and accurate voice control on the intelligent terminal is realized, and the safety and convenience of a driver in operating the intelligent terminal are ensured to the maximum extent.
Drawings
FIG. 1 is a block diagram of the architecture of the Bluetooth Voice transport private protocol in one embodiment of the invention;
FIG. 2 is a flow chart illustrating a Bluetooth voice control method according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating voice recognition using VTCP protocol in a preferred embodiment of the present invention;
fig. 4 is a schematic block diagram of a bluetooth voice control apparatus according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are presently preferred modes of carrying out the invention, and that the description is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The protection scope of the present invention shall be defined by the appended claims, and all other embodiments obtained by those skilled in the art without any inventive work shall fall within the protection scope of the present invention.
The existing Bluetooth standard protocol utilizes the HSP protocol to return voice, and accurate voice recognition is difficult to realize due to low sampling rate, so that inconvenience is brought to voice control by Bluetooth equipment. The invention improves the mode of returning voice from the Bluetooth peripheral, adopts VTCP (virtual TCP) protocol to transmit 16KHz voice signals through RFCOMM (serial port simulation protocol) channel, and effectively improves the voice recognition rate by voice data with high sampling rate.
In one embodiment of the present invention, the private bluetooth voice transport protocol is established using the VTCP protocol, the overall architecture of which is shown in fig. 1. The same layer or lower layer protocols except the VTCP all belong to core protocols in a standard bluetooth protocol stack formulated by the SIG group, and although the standard bluetooth protocol stack may further include other selected protocols or undergo changes, the core protocols are supported by all bluetooth devices, so that the implementation based on the core protocols does not have compatibility problems. The specific core protocols include a baseband (Base Band) protocol, a Link Management (LM) protocol, a logical link control and adaptation protocol (L2CAP), and a Service Discovery Protocol (SDP), while an SCO (connection-oriented synchronous link) belongs to a connection mode over the baseband protocol, and an RFCOMM belongs to a universal serial transmission protocol, and the protocol specifications and the relationship between them are described in more detail in a standard technical document of the SIG group, and are not described again here. Since these standard protocols can be supported by all existing bluetooth devices, the underlying communication in the present invention can be transmitted in any bluetooth device. Based on the standard protocols, the invention further realizes the grouping transmission of data in a VTCP mode by loading application in the intelligent terminal (typically, such as a mobile phone, a tablet personal computer and the like), realizes the high-sampling-rate and high-speed voice transmission, and further realizes the voice control of the intelligent terminal.
Further, referring to fig. 2, in an embodiment of the present invention, the bluetooth voice control method includes the steps of:
performing Bluetooth pairing connection with an external device;
sending a request signal to the peripheral equipment, and trying to connect an RFCOMM channel established by the peripheral equipment;
receiving a confirmation RFCOMM channel establishment signal returned by the peripheral equipment, and establishing a Socket port based on the RFCOMM;
receiving a VTCP data packet transmitted from a peripheral through the Socket port;
and recognizing the voice command in the data packet, and converting the voice command into a specific control command to operate the intelligent terminal.
In the preferred embodiment of the present invention, the data packet of the VTCP protocol is preferably used for transmitting voice data, but the data transmitted in the data packet is not limited to voice data, and in other preferred embodiments of the present invention, the data packet of the VTCP protocol may be used for transmitting various interactive data. For example, control commands, sensor data, file (including but not limited to text, graphics, audio, video, software, etc.) data, network data, or a combination thereof may also be transmitted via the VTCP protocol. Therefore, based on the VTCP protocol, besides the voice control of the smart terminal can be realized through the bluetooth peripheral, the smart terminal can also realize a plurality of interaction modes (including but not limited to transmitting remote control operation, sensing information, navigation information, etc.) with the smart terminal by means of the bluetooth peripheral, or realize interaction between the smart terminal (including but not limited to a mobile terminal, a smart appliance, a PC device, an embedded system, and/or a wearable smart device) and a plurality of bluetooth peripherals (including but not limited to an earphone, a hands-free communicator, a remote controller, a car recorder, a navigator, a HUD, various wearable devices, or a combination of the above peripherals). The data type and application of the VTCP protocol should not be construed as limiting the invention herein.
Referring again to fig. 3, the process of speech recognition using VTCP protocol is as follows:
opening a microphone input unit of the external device to receive user voice, and packaging and compressing the audio signal converted by the ADC according to a format of 16KHz and 16 bit;
receiving a data packet transmitted by peripheral equipment in a packaging way through a Socket port;
checking the integrity and continuity of the data packet;
preprocessing the voice data in the data packet such as noise suppression, echo cancellation, human voice detection and the like;
performing voice recognition and semantic understanding on the preprocessed voice data;
and sending the final recognition result back to a processor of the intelligent terminal in a command form, and executing corresponding processing operation.
Preferably, the method of the present invention is provided to the intelligent terminal in a mobile application manner, so as shown in fig. 3, after the intelligent terminal is ready (i.e. starts the application), a voice recognition request is first initiated to the peripheral; after receiving the request, the peripheral plays a prompt tone; after the prompt tone is over, the peripheral device turns on the microphone input unit. Subsequently, after the voice control function is executed (for example, the terminal closes the application), the intelligent terminal simultaneously sends a voice recognition end signal to the peripheral, and the peripheral closes the microphone according to the signal.
Furthermore, before the voice control is effective, the application is started in the intelligent terminal, a user also needs to perform certain operation, and in order to reduce manual operation of a driver, the application is preferably started wirelessly in a remote control mode. The intelligent terminal establishes wireless link with the remote controller through the wireless interface, receives remote control operation of the remote controller and starts a voice control process. The wireless interface is preferably an infrared interface or a Bluetooth interface, and accordingly receives infrared or Bluetooth signals (both BR/EDR or BLE modes) of the remote controller to realize starting operation.
Those skilled in the art will understand that, corresponding to the method of the present invention, the present invention also includes a bluetooth voice control apparatus, which corresponds to the above method steps one by one, as shown in fig. 4, and includes:
the Bluetooth pairing module is used for carrying out Bluetooth pairing connection with the peripheral equipment;
the request module is used for sending a request signal to the peripheral equipment and trying to connect an RFCOMM channel formulated by the peripheral equipment;
the channel module is used for receiving a confirmation RFCOMM channel establishment signal returned by the peripheral equipment and establishing a Socket port based on the RFCOMM;
the receiving module is used for receiving the VTCP data packet transmitted by the peripheral equipment through the Socket port;
and the recognition processing module is used for recognizing the voice command in the data packet and converting the voice command into a specific control command to operate the intelligent terminal.
The technical scheme of the invention is mainly provided for the intelligent terminal in a mobile application mode, and typical intelligent terminals such as mobile phones, tablet computers and the like. The intelligent terminal comprises the modules of the Bluetooth voice control device, an interface module and other functional modules, wherein the interface module can receive the input of a remote controller device to control the intelligent terminal; other functional modules provide richer application functions for the intelligent terminal, such as third-party navigation, camera driving and the like. Through the technical scheme of the invention, a user can complete the control of the intelligent terminal without any hand operation, such as setting a destination and starting navigation, photographing, shooting, dialing a phone, selecting a song to play and the like. Therefore, the technical scheme of the invention is particularly suitable for vehicle-mounted equipment, and can ensure the safety and convenience of a driver when the driver operates the intelligent terminal to the maximum extent. Those skilled in the art should understand that the bluetooth headset is only one of the most preferable embodiments of the present invention, and the technical solution of the present invention is not limited to the vehicle-mounted environment and the interaction between the headset and the mobile phone, and any peripheral device capable of collecting voice and intelligent terminal with certain processing capability can implement the technical solution of the present invention, and the above-mentioned preferred embodiments should not be construed as limiting the present invention.
In addition, compared with the prior art, the technical scheme of the invention also has the following advantages:
1. the 16KHz voice signal is transmitted through the RFCOMM channel, and the recognition rate is improved. The invention further tests 300 personal name and place name samples, and the recognition rate of the 16KHz voice sample is reduced by 15 percent compared with the recognition error rate (WER) of the 8KHz sample.
2. When the private protocol is used, all mobile phones communicate with the Bluetooth peripheral equipment through the installed client application, so that the problem of compatibility that some mobile phones do not support the HSP voice recognition function is solved.
3. And the strong processing capacity of the smart phone is utilized to suppress the noise in the vehicle. By collecting 300 name samples collected in the high-noise environment in the automobile for testing, the recognition rate without pretreatment is only 72%, and the recognition rate after the pretreatment is increased to 95%.
Although the present invention has been described in connection with preferred embodiments, it will be understood by those skilled in the art that the methods and systems of the present invention are not limited to the embodiments described in the detailed description, and various modifications, additions, and substitutions are possible, without departing from the spirit and scope of the invention as defined in the accompanying claims.
Claims (12)
1. A bluetooth voice control method, characterized in that the method comprises the steps of:
performing Bluetooth pairing connection with an external device;
sending a request signal to the peripheral equipment, and trying to connect an RFCOMM channel established by the peripheral equipment;
receiving a confirmation RFCOMM channel establishment signal returned by the peripheral equipment, and establishing a Socket port based on the RFCOMM;
receiving a VTCP data packet transmitted from a peripheral through the Socket port;
and recognizing the voice command in the data packet, and converting the voice command into a specific control command to operate the intelligent terminal.
2. The method of claim 1, wherein the method further comprises, after establishing the Socket port, the steps of:
opening a microphone of the external device to receive user voice, and packaging and compressing the audio signal converted by the ADC according to a format of 16KHz and 16 bit;
receiving a data packet transmitted by peripheral equipment in a packaging way through a Socket port;
checking the integrity and continuity of the data packet;
preprocessing the voice data in the data packet by noise suppression, echo cancellation and human voice detection;
performing voice recognition and semantic understanding on the preprocessed voice data;
and sending the final recognition result back to a processor of the intelligent terminal in a command form, and executing corresponding processing operation.
3. The method of claim 2, wherein before the step of turning on the peripheral microphone, the method further comprises the steps of:
the intelligent terminal is ready for starting and initiates a voice recognition request to the peripheral;
after receiving the request, the peripheral plays a prompt tone;
after the prompt tone is finished, the peripheral device turns on the microphone.
4. The method of claim 1 or 2, further comprising the steps of:
and when the processing operation preparation is finished, sending a voice recognition finishing signal to the peripheral equipment, and closing the microphone by the peripheral equipment according to the voice recognition finishing signal.
5. The method according to claim 3, wherein the method is characterized in that the intelligent terminal is ready for starting and comprises the following steps:
and establishing a wireless link with the remote controller through a wireless interface, receiving the remote control operation of the remote controller, and starting a voice control process.
6. The method of claim 1, wherein the external device is an in-vehicle device, a headset, and/or a wearable device; the intelligent terminal is a mobile terminal, an intelligent household appliance, a PC device, an embedded system and/or a wearable intelligent device.
7. A bluetooth voice control apparatus, the apparatus comprising:
the Bluetooth pairing module is used for carrying out Bluetooth pairing connection with the peripheral equipment;
the request module is used for sending a request signal to the peripheral equipment and trying to connect an RFCOMM channel formulated by the peripheral equipment;
the channel module is used for receiving a confirmation RFCOMM channel establishment signal returned by the peripheral equipment and establishing a Socket port based on the RFCOMM;
the receiving module is used for receiving the VTCP data packet transmitted by the peripheral equipment through the Socket port;
and the recognition processing module is used for recognizing the voice command in the data packet and converting the voice command into a specific control command to operate the intelligent terminal.
8. The apparatus of claim 7, wherein the identification processing module further comprises:
the checking module is used for checking the integrity and the continuity of the data packet;
the preprocessing module is used for preprocessing the voice data in the data packet by noise suppression, echo cancellation and human voice detection;
the semantic processing module is used for carrying out voice recognition and semantic understanding on the preprocessed voice data;
and the execution module is used for sending the final recognition result back to the processor of the intelligent terminal in a command form and executing corresponding processing operation.
9. The apparatus of claim 7, wherein the apparatus further comprises:
the starting module is used for initiating a voice recognition request to the peripheral equipment when the starting preparation is ready, the peripheral equipment plays a prompt tone according to the request, and the peripheral equipment opens the microphone after the prompt tone is finished;
and the ending module is used for sending a voice recognition ending signal to the peripheral equipment when the processing operation preparation is finished, and the peripheral equipment closes the microphone according to the voice recognition ending signal.
10. The apparatus of claim 7, wherein the external device is an in-vehicle device, a headset, and/or a wearable device; the intelligent terminal is a mobile terminal, an intelligent household appliance, a PC device, an embedded system and/or a wearable intelligent device.
11. An intelligent terminal, characterized in that, intelligent terminal includes: the apparatus of any one of claims 7-10, and an interface module and at least one functional module; wherein,
the interface module establishes a wireless link with a remote controller and receives remote control operation of the remote controller;
and the functional module receives the control instruction provided by the identification processing module to complete the corresponding operation function.
12. The intelligent terminal according to claim 11, wherein the interface module is an infrared interface or a bluetooth interface.
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