CN110300318A - A kind of USB terminal interface circuit and USB terminal interface circuit control method - Google Patents
A kind of USB terminal interface circuit and USB terminal interface circuit control method Download PDFInfo
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- CN110300318A CN110300318A CN201910402622.XA CN201910402622A CN110300318A CN 110300318 A CN110300318 A CN 110300318A CN 201910402622 A CN201910402622 A CN 201910402622A CN 110300318 A CN110300318 A CN 110300318A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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Abstract
The invention discloses a kind of USB terminal interface circuit and USB terminal interface circuit control method, the USB terminal interface circuit is connect with circumscribed USB equipment comprising TV master chip, USB interface terminal and analog switch module；After circumscribed USB equipment accesses circuit, circumscribed USB equipment is communicated by USB interface terminal with TV master chip, and judges circumscribed USB device type by television set；If circumscribed USB equipment is far field speech ciphering equipment, high-level control signal is generated by TV master chip, analog switch module is connected；Analog switch module reception of echoes reference signal reaches USB interface terminal and is sent to far field speech ciphering equipment simultaneously；If circumscribed USB equipment is other equipment, low level control signal is generated by TV master chip and disconnects analog switch module.By adding analog switch module between USB interface terminal and TV master chip, realizing an interface can carry out data transmission with external far field speech ciphering equipment and echo reference signal is passed back far field speech ciphering equipment the present invention.
Description
Technical field
The present invention relates to intelligent television field, in particular to a kind of USB terminal interface circuit and USB terminal interface circuit control
Method processed.
Background technique
Major part TV has been adapted to far field voice module at present, and far field voice module is broadly divided into television on hardware
Module and external module are set, mainly has universal serial bus (calling USB in the following text) signal and echo to join in the connection with TV motherboard
Signal is examined, after the remote speech equipment access television set with external module, in the speech recognition process of far field, is needed TV
The sound that loudspeaker issue is eliminated, it is therefore desirable to it is external to far field speech ciphering equipment that an echo reference signal is returned from television set
In module, reference data is provided for external far field voice module end echo cancellation algorithm.
In the prior art, built-in module mainly uses customized wire specification, and external module then mainly uses USB2.0
TYPE A type interface transmission of speech signals obtains television echo reference signal using 3.5mm TRRS earphone interface.
However, the external far field voice module signal transmission of television at present is using USB transmission data and passes through earphone interface
It is transmitted back to the mode of acoustic reference signal, while occupying two external terminals of television, wastes TV terminal resources.
Thus the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of USB terminal interface circuit and
USB terminal interface circuit control method, by increasing an analog switch mould between USB interface terminal and TV master chip
Block, realizing an interface can carry out data transmission with external far field speech ciphering equipment and echo reference signal is passed back far field
Speech ciphering equipment saves TV terminal resources；And improve the effect of module echo cancellor.
In order to achieve the above object, this invention takes following technical schemes:
A kind of USB terminal interface circuit, the USB terminal interface circuit are connect with circumscribed USB equipment comprising TV main core
Piece, the USB terminal interface circuit further include USB interface terminal, analog switch module；When circumscribed USB equipment accesses the electricity
Lu Hou, the circumscribed USB equipment is communicated by USB interface terminal with the TV master chip, and judges institute by television set
State circumscribed USB device type；If the circumscribed USB equipment is far field speech ciphering equipment, high level control is generated by TV master chip
Analog switch module is connected signal processed；The analog switch module reception of echoes reference signal reaches USB interface terminal simultaneously
And it is sent to far field speech ciphering equipment；If the circumscribed USB equipment is other equipment, low level control is generated by TV master chip
Signal disconnects analog switch module.The embodiment of the present invention between USB interface terminal and TV master chip by increasing by one
Analog switch module realizes that an interface can carry out data transmission with external far field speech ciphering equipment, and echo with reference to letter
Number pass far field speech ciphering equipment back, while when the introducing of analog switch module can avoid when accessing circumscribed USB equipment due to signal
Equipment nonrecognition problem caused by sequence mistake.
Optionally, in the embodiment of the present invention, the circuit further includes power amplifier module, the power amplifier module and TV master chip
It is connected with analog switch module, the echo reference signal reaches analog switch module after power amplifier module amplifies, by simulating
Switch module reaches USB interface terminal and is sent to far field speech ciphering equipment.The embodiment of the present invention passes through in TV master chip and mould
Increase a power amplifier module between quasi- switch module, echo reference signal has been subjected to the audio effect processing of power amplifier, echo reference
Signal have passed through power amplifier module amplification, with TV loudspeaker reality output voice signal more closely, be more advantageous to promoted it is external
The effect of far field voice module end echo cancellation algorithm.
Optionally, in the embodiment of the present invention, the USB interface terminal is USB3.0 Interface Terminal, is specifically used for being outer
The communication transmitting data of USB device and TV master chip are connect, and when the circumscribed USB equipment is remote speech equipment, transmitting
Echo reference signal is to remote speech equipment；First foot of the USB3.0 Interface Terminal connects to power supply, and the USB3.0 connects
The crus secunda and third foot of mouth terminal are connect with TV master chip, and the 4th foot and the 7th foot of the USB3.0 Interface Terminal connect
Ground, the 5th foot, the 6th foot, octal and the 9th foot of the USB3.0 Interface Terminal are connect with analog switch module.This implementation
Example transmits normal communication data and echo reference signal simultaneously using USB3.0 Interface Terminal, realizes while compatible external remote
The transmission of field speech ciphering equipment voice signal and echo reference signal.
The analog switch module includes analog switch unit, output capacitance unit and input capacitance unit；The simulation
Switch unit is specifically used for carrying out on or off according to the control signal of TV master chip, to transmit to USB interface terminal
Echo reference signal does not send back acoustic reference signal to USB interface terminal；The output capacitance unit is specifically same as simulation and opens
Close unit output filtering；The input capacitance unit is specifically used for analog switch unit input filter.
The analog switch unit includes analog switch, the first output end of the analog switch, second output terminal, third
Output end and the 4th output end are connect with the output capacitance unit respectively, the first input end of the analog switch, second defeated
Enter end, third input terminal and the 4th input terminal to connect with input capacitance unit respectively, the control terminal and TV of the analog switch
Master chip connection.
The output capacitance unit includes first capacitor, the second capacitor, third capacitor and the 4th capacitor, the first capacitor
Connect respectively with the first output end of the 5th foot of USB interface terminal and analog switch, second capacitor respectively with USB interface
6th foot of terminal is connected with the second output terminal of analog switch, the third capacitor octal with USB interface terminal respectively
It is connected with the third output end of analog switch, the 4th capacitor is opened with the 9th foot of the USB interface terminal and simulation respectively
The 4th output end connection closed.
The input capacitance unit includes the 5th capacitor, the 6th capacitor, the 7th capacitor and the 8th capacitor, the 5th electricity
Appearance, the 6th capacitor, the 7th capacitor and the 8th capacitor are inputted with the first input end of analog switch, the second input terminal, third respectively
End is connected with the 4th input terminal, and the 5th capacitor, the 6th capacitor, the 7th capacitor and the 8th capacitor are also connect with power amplifier module.
A kind of USB terminal interface circuit control method, which comprises the steps of:
Circumscribed USB equipment accesses circuit, and is communicated by USB interface terminal with TV master chip；
Television set judges that the circumscribed USB equipment is far field speech ciphering equipment or other set by the received information of TV master chip
It is standby；
If judging the circumscribed USB equipment for far field speech ciphering equipment, high-level control signal is generated to mould by TV master chip
Quasi- switch module switches it on, while the analog switch module reception of echoes reference signal reaches USB interface terminal and sends
To far field speech ciphering equipment；If judging the circumscribed USB equipment for other equipment, low level control letter is generated by TV master chip
Number to analog switch module, analog switch module is made to keep low level off state；
After detecting that far field speech ciphering equipment is pulled out, TV master chip will control signal and switch to low level by high level, control
Analog switch module disconnects, into off state.
If judging the circumscribed USB equipment for far field speech ciphering equipment, high-level control signal is generated by TV master chip
It is switched it on to analog switch module, while the analog switch module reception of echoes reference signal reaches USB interface terminal simultaneously
It is sent to far field speech ciphering equipment；If judging the circumscribed USB equipment for other equipment, low level control is generated by TV master chip
To analog switch module, the step of making analog switch module keep low level off state includes: signal processed
The filtering of echo reference signal is reached analog switch by input capacitance unit；
The echo reference signal is reached output capacitance unit and exported to USB interface terminal by analog switch；
The echo reference signal is reached far field speech ciphering equipment by USB interface terminal.
Compared to the prior art, USB terminal interface circuit provided by the invention and USB terminal interface circuit control method,
The USB terminal interface circuit is connect with circumscribed USB equipment comprising TV master chip, USB interface terminal and analog switch mould
Block；After circumscribed USB equipment accesses circuit, circumscribed USB equipment is communicated by USB interface terminal with TV master chip, and
Circumscribed USB device type is judged by television set；If circumscribed USB equipment is far field speech ciphering equipment, generated by TV master chip high
Analog switch module is connected level controling signal, while the analog switch module reception of echoes reference signal reaches USB and connects
Mouth terminal is simultaneously sent to far field speech ciphering equipment；If circumscribed USB equipment is other equipment, low level control is generated by TV master chip
Signal processed disconnects analog switch module.The present invention between USB interface terminal and TV master chip by increasing a simulation
Switch module, realizing an interface can carry out data transmission with external far field speech ciphering equipment and echo reference signal is passed
Far field speech ciphering equipment is returned, TV terminal resources are saved；The introducing of analog switch module simultaneously can avoid setting when access circumscribed USB
Due to equipment nonrecognition problem caused by signal sequence mistake when standby.
Detailed description of the invention
Fig. 1 is the structural block diagram of USB terminal interface circuit provided by the invention；
Fig. 2 is the structural block diagram of the alternative embodiment of USB terminal interface circuit provided by the invention；
Fig. 3 is the circuit diagram of USB terminal interface circuit provided by the invention；
Fig. 4 is the flow chart of USB terminal interface circuit control method provided by the invention；
Fig. 5 is flow chart of the USB terminal interface circuit control method provided by the invention in step S310；
Fig. 6 is flow chart of the USB terminal interface circuit control method provided by the invention in step S300.
Specific embodiment
In view of being occupied simultaneously in such a way that USB transmission data are transmitted back to acoustic reference signal with earphone interface in the prior art
Two external terminals of television, the shortcomings that wasting TV terminal resources, the present invention passes through in USB interface terminal and TV
Increase an analog switch module between master chip, data biography can be carried out with external far field speech ciphering equipment by realizing an interface
It is defeated and echo reference signal is passed back far field speech ciphering equipment, save TV terminal resources.And further embodiment acquires
Power amplifier module rear end is transferred to the signal by amplification of loudspeaker as echo reference signal, can effectively improve far field voice module
The effect of echo cancellor.
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, right as follows in conjunction with drawings and embodiments
The present invention is further described.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to
Limit the present invention.
In the present invention related USB3.0 Interface Terminal be considered as SuperSpeedUSB-- be those with PC or
The various equipment that audio/high-frequency apparatus is connected provide a standard interface.USB3.0 interface end involved in the present invention
Son is a hardware device, and it is relevant that USB3.0 just can be used after the relevant hardware device of the interior only installation USB3.0 of computer
Function, from keyboard to high-throughput disc driver, various devices can carry out even running using this inexpensive interface
Plug and play connection, user do not have to spend too many thought above substantially.New USB 3.0 is keeping compatible with USB 2.0
While property, several following enhancing functions are additionally provided:
1, bandwidth is greatly improved -- up to 5Gbps full duplex (USB2.0 is then 480Mbps half-duplex).
2, better power management is realized.
3, host device can be made to provide more power, to realize USB-- rechargeable battery, LED illumination and mini
The application such as fan.
4, host quickly recognition means can be made.
5, new agreement makes the more efficient of data processing.
Referring to Fig. 1, a kind of USB terminal interface circuit provided by the invention, the USB terminal interface circuit with it is external
USB device connection comprising TV master chip 100, the USB terminal interface circuit further include USB interface terminal 200, simulation
Switch module 300；After circumscribed USB equipment accesses the circuit, the circumscribed USB equipment passes through USB interface terminal 200 and institute
It states TV master chip 100 to be communicated, and the circumscribed USB device type is judged by television set；If the circumscribed USB equipment is
Far field speech ciphering equipment then generates high-level control signal by TV master chip 100 and analog switch module 300 is connected；Institute simultaneously
300 reception of echoes reference signal of analog switch module is stated to reach USB interface terminal 200 and be sent to far field speech ciphering equipment；If institute
Stating circumscribed USB equipment is other equipment, then generates low level control signal for analog switch module 300 by TV master chip 100
It disconnects.The embodiment of the present invention between USB interface terminal 200 and TV master chip 100 by increasing an analog switch module
300, realizing an interface can carry out data transmission with external far field speech ciphering equipment, and echo reference signal is passed back far
Field speech ciphering equipment saves TV terminal resources, while the introducing of analog switch module 300 can avoid setting when access circumscribed USB
Due to equipment nonrecognition problem caused by signal sequence mistake when standby.
When it is implemented, the circumscribed USB equipment is logical when the circumscribed USB equipment accesses the USB terminal interface circuit
It crosses two communications pins of DM and DP to communicate with TV master chip, judges whether the circumscribed USB equipment is long-range by TV master chip
Speech ciphering equipment, if so, generating high-level control signal control analog switch module conducting by TV master chip, and by TV master
Chip echogenicity reference signal is to analog switch module 300, while 300 reception of echoes reference signal of the analog switch module
USB interface terminal is reached, and then remote speech equipment is reached by USB interface terminal；It realizes when circumscribed USB equipment is far field language
When sound equipment, echo reference signal is reached the circumscribed USB equipment by ability conduct either analog switch module, if circumscribed USB equipment is
When other equipment, then analog switch is turned off, signal interference is avoided to cause timing error and lead to equipment nonrecognition.
It should be noted that the TV master chip can be the smart television core of existing any adaptation far field speech ciphering equipment
Piece, then this is not construed as limiting.
Optionally, referring to figure 2., in alternative embodiment of the invention, the circuit further includes power amplifier module 400, described
Power amplifier module 400 is connect with TV master chip 100 and analog switch module 300, and the echo reference signal passes through power amplifier module
Analog switch module 300 is reached after 400 amplifications, USB interface terminal 200 is reached by analog switch module 300 and is sent to far field
Speech ciphering equipment.The embodiment of the present invention will be returned by increasing a power amplifier module between TV master chip and analog switch module
Acoustic reference signal has carried out the audio effect processing of power amplifier, which have passed through power amplifier module amplification, with TV loudspeaker
Reality output voice signal is more closely, be more advantageous to the effect for promoting external far field voice module end echo cancellation algorithm.
Optionally, the power amplifier module is also connected with loudspeaker, and the voice signal of amplification is transferred to loudspeaker broadcasting, the echo
Reference signal is obtained from the transmission line of power amplifier and loudspeaker, is then passed to analog switch module.
When it is implemented, TV master chip 100 generates voice signal and passes through power amplifier mould in alternative embodiment of the invention
Block 400 amplifies, then reaches loudspeaker 500 and play sound；It is acquired back between 400 rear end of power amplifier module and the connecting line of loudspeaker 500
The voice signal that acoustic reference signal, the echo reference signal and loudspeaker 500 play has also passed through the amplification of power amplifier module 400,
Voice signal with 500 reality output of loudspeaker is more closely, reach analog switch module for collected echo reference signal
300, and whether be far field speech ciphering equipment by the circumscribed USB equipment that television set judgement is currently inserted into, if so, by TV master chip
Analog switch module 300 is connected 100 generation high-level control signals, makes to open by amplified echo reference signal from simulation
Close module 300 reach USB interface terminal 200, be then forwarded to far field speech ciphering equipment, for far field speech ciphering equipment de-noising provide it is more excellent
Good reference data.
Optionally, referring to figure 3., in the embodiment of the present invention, the USB interface terminal 200 is USB3.0 Interface Terminal,
Data are transmitted specifically for the communication for circumscribed USB equipment and TV master chip 100, and when the circumscribed USB equipment is long-range
When speech ciphering equipment, acoustic reference signal is passed back to remote speech equipment；The present embodiment is transmitted simultaneously using USB3.0 Interface Terminal
Normal communication data and echo reference signal, realize while compatible external far field speech ciphering equipment voice signal and echo refer to
The transmission of signal.
When it is implemented, the specifically used USB3.0 TYPE A type of the USB3.0 Interface Terminal selected in the embodiment of the present invention
Interface Terminal, the USB3.0 Interface Terminal have 9 tunnel signal pins, to the interface of USB3.0 Interface Terminal in the embodiment of the present invention
Definition is changed, specifically, the first foot VBUS of the USB3.0 Interface Terminal is connected to power supply, the USB3.0 interface
The crus secunda DM and third foot DP of terminal are connect with TV master chip 100, the 4th foot GND1 of the USB3.0 Interface Terminal and
7th foot GND2 ground connection, the 5th foot SPK_L- of the USB3.0 Interface Terminal, the 6th foot SPK_L+, octal SPK_R- and the
Nine foot SPK_R+ are connect with analog switch K module 300.
Wherein, the first foot VBUS of USB3.0 Interface Terminal is 5V energization pins；The crus secunda DM of USB3.0 Interface Terminal
It is USB2.0 standard difference data transfer signal pin, the crus secunda DM and third of the USB3.0 Interface Terminal with third foot DP
Foot DP is connect with TV master chip 100 and circumscribed USB equipment, and then logical between circumscribed USB equipment and TV master chip 100
Letter transmitting signal；5th foot SPK_L- of USB3.0 Interface Terminal and the 6th foot SPK_L+ is the difference echo for transmitting L channel
The transmission pin of reference signal, the octal SPK_R- and the 9th foot SPK_R+ of USB3.0 Interface Terminal are that the difference of right channel is returned
The transmission pin of acoustic reference signal, the 5th foot SPK_L-, the 6th foot SPK_L+, octal SPK_ of the USB3.0 Interface Terminal
R- and the 9th foot SPK_R+ is connected with corresponding 300 pin of analog switch module and circumscribed USB equipment pin, when described external
When USB device is far field speech ciphering equipment and the conducting of analog switch module 300, the 5th foot SPK_L- of the USB3.0 Interface Terminal
It is set respectively to long-distance phonetic with the octal SPK_R- and the 9th foot SPK_R+ of the 6th foot SPK_L+ and USB3.0 Interface Terminal
It is standby to transmit left and right echo reference signal；The 4th foot GND1 and the 7th foot GND2 of the USB3.0 Interface Terminal are grounding pin.
The analog switch module 300 includes analog switch unit 301, input capacitance unit 302 and output capacitance unit
303；The analog switch unit 301 is specifically used for carrying out on or off according to the control signal of TV master chip 100, with
Acoustic reference signal is sent back to USB interface terminal 200 or does not send back acoustic reference signal to USB interface terminal 200；The output
Capacitor cell 303 is specifically same as the output filtering of analog switch unit 301；The input capacitance unit 302 is specifically used for simulation and opens
Close 301 input filter of unit.
The analog switch unit 301 includes analog switch K, the first output end OUT1 of the analog switch K, second defeated
Outlet OUT2, third output end OUT3 and the 4th output end OUT4 are connect with the output capacitance unit 303 respectively, the simulation
The first input end IN1 of switch K, the second input terminal IN2, third input terminal IN3 and the 4th input terminal IN4 respectively with input capacitance
Unit 302 connects, and the control terminal CTL of the analog switch K is connect with TV master chip 100.
The output capacitance unit 303 includes first capacitor C1, the second capacitor C2, third capacitor C3 and the 4th capacitor C4,
The first capacitor C1 is connect with the first output end OUT1 of the 5th foot of USB interface terminal 200 and analog switch K respectively, institute
The second capacitor C2 is stated to connect with the second output terminal OUT2 of the 6th foot of USB interface terminal 200 and analog switch K respectively, it is described
Third capacitor C3 is connect with the third output end OUT3 of the octal of USB interface terminal 200 and analog switch K respectively, and described
Four capacitor C4 are connect with the 4th output end OUT4 of the 9th foot of the USB interface terminal 200 and analog switch K respectively.
The input capacitance unit 302 includes the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7 and the 8th capacitor C8,
The 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7 and the 8th capacitor the C8 first input end with analog switch K respectively
IN1, the second input terminal IN2, third input terminal IN3 and the 4th input terminal IN4 connection, the 5th capacitor C5, the 6th capacitor C6,
7th capacitor C7 and the 8th capacitor C8 are also connect with power amplifier module 400.
When it is implemented, the analog switch K is four-way analog switch in the embodiment of the present invention, it is mainly used for controlling
The on-off of left and right acoustic channels difference echo reference signal processed, the control terminal CTL of analog switch K are connected to the choosing of TV master chip 100
Control terminal STL_CTL is selected, control signal is generated by the selection control terminal STL_CTL of TV master chip, to control analog switch
On-off, and then control whether to be transmitted back to acoustic reference signal, specifically, the 5th capacitor C5, the 6th capacitor C6, the 7th capacitor C7
AMP_L-, AMP_L+, AMP_R- and AMP_R+ signal that power amplifier module sends over are received respectively with the 8th capacitor C8, by electricity
Capacitor filter enters analog switch K, and when control terminal CTL is low level, the four-way switch of analog switch K is disconnected, the USB3.0
The 5th foot SPK_L-, the 6th foot SPK_L+, octal SPK_R- and the 9th foot SPK_R+ of Interface Terminal 201 are equivalent to open circuit；
When control terminal CTL is high level, the four-way switch conducting of analog switch K, the echo reference signal is passed by analog switch K
To interface output pin；In addition, being respectively connected to a capacitor in the four road input terminals of analog switch K and four road output ends, rise
To the effect of input capacitance filtering and output capacitance filtering, make input, the output voltage stabilization of analog switch K module 300.
It should be noted that the above four-way analog switch K can select according to actual needs appropriate chip device into
Row is built, its circuit design is not unfolded deeply here.
Based on above-mentioned USB terminal interface circuit, the present invention also provides a kind of USB terminal interface circuit control method,
Referring to Fig. 4, the USB terminal interface circuit control method includes the following steps:
S100, circumscribed USB equipment access circuit, and are communicated by USB interface terminal with TV master chip；
S200, television set by the received information of TV master chip judge the circumscribed USB equipment be far field speech ciphering equipment or
Other equipment；
If S300, judging the circumscribed USB equipment for far field speech ciphering equipment, high-level control signal is generated by TV master chip
It is switched it on to analog switch module, while the analog switch module reception of echoes reference signal reaches USB interface terminal simultaneously
It is sent to far field speech ciphering equipment；If judging, the circumscribed USB equipment is not far field speech ciphering equipment, is generated by TV master chip low
Level controling signal makes analog switch module keep low level off state to analog switch module；
After detecting that far field speech ciphering equipment is pulled out, TV master chip will control signal and switchs to low level by high level S400,
It controls analog switch module to disconnect, into off state.
Specifically, in the embodiment of the present invention, when USB interface terminal does not access circumscribed USB equipment, analog switch module control
Signal processed is defaulted as low level, and analog switch module is defaulted as off state；After circumscribed USB equipment accesses circuit, first pass through
USB interface terminal is communicated with TV master chip, and then is judged according to the received information of TV master chip by television set described external
The device type of equipment, and chosen whether to send high-level control signal opening analog switch module according to device type；If
Far field speech ciphering equipment is then connected by the control signal control module switch module that TV master chip generates high level, and by TV
Master chip echogenicity reference signal reaches far field speech ciphering equipment to analog switch module 300, and by USB interface terminal；If
It is not far field speech ciphering equipment, then so that analog switch module is kept low level pass by the control signal that TV master chip generates level
Disconnected state avoids echo reference signal from generating interference to other equipment, and equipment is not caused by occurring due to signal sequence mistake
Identification problem.After detecting that far field speech ciphering equipment is pulled out, TV master chip will control signal and switch to low level by high level,
It controls analog switch module to disconnect, into off state, achievees the effect that reset.
Optionally, referring to Fig. 5, in the embodiment of the present invention, the step S300 includes:
S310, the TV master chip generate echo reference signal, first pass through power amplifier module in advance and put the echo reference signal
Greatly, amplified echo reference signal is reached into analog switch module.
Specifically, referring to Fig. 6, in the embodiment of the present invention, the step S300 further include:
The filtering of echo reference signal is reached analog switch by S301, input capacitance unit；
The echo reference signal is reached output capacitance unit and exported to USB interface terminal by S302, analog switch；
The echo reference signal is reached far field speech ciphering equipment by S303, USB interface terminal.
In conclusion USB terminal interface circuit provided by the invention and USB terminal interface circuit control method, the USB
Terminal interface circuit is connect with circumscribed USB equipment comprising TV master chip, USB interface terminal and analog switch module；When outer
After connecing USB device access circuit, circumscribed USB equipment is communicated by USB interface terminal with TV master chip, and by television set
Judge circumscribed USB device type；If circumscribed USB equipment is far field speech ciphering equipment, high level control is generated by TV master chip
Analog switch module is connected signal, while the analog switch module reception of echoes reference signal reaches USB interface terminal hair
It is sent to far field speech ciphering equipment；If circumscribed USB equipment is other equipment, low level control signal is generated for mould by TV master chip
Quasi- switch module disconnects.The present invention is real by increasing an analog switch module between USB interface terminal and TV master chip
Having showed an interface can carry out data transmission with external far field speech ciphering equipment and echo reference signal is passed back far field voice
Equipment saves TV terminal resources；The introducing of analog switch module simultaneously can avoid when accessing circumscribed USB equipment due to letter
Equipment nonrecognition problem caused by number timing error.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of USB terminal interface circuit, the USB terminal interface circuit is connect with circumscribed USB equipment comprising TV main core
Piece, which is characterized in that the USB terminal interface circuit further includes USB interface terminal, analog switch module；When circumscribed USB equipment
After accessing the circuit, the circumscribed USB equipment is communicated by USB interface terminal with the TV master chip, and by electricity
The circumscribed USB device type is judged depending on machine；If the circumscribed USB equipment is far field speech ciphering equipment, produced by TV master chip
Analog switch module is connected raw high-level control signal；The analog switch module reception of echoes reference signal reaches simultaneously
USB interface terminal is simultaneously sent to far field speech ciphering equipment；If the circumscribed USB equipment is other equipment, produced by TV master chip
Raw low level control signal disconnects analog switch module.
2. USB terminal interface circuit according to claim 1, which is characterized in that the circuit further includes power amplifier module, described
Power amplifier module is connect with TV master chip and analog switch module, and the TV master chip generates echo reference signal and passes through power amplifier
Analog switch module is reached after module amplification, USB interface terminal is reached by analog switch module and is sent to far field speech ciphering equipment.
3. USB terminal interface circuit according to claim 1 or claim 2, which is characterized in that the USB interface terminal is USB3.0
Interface Terminal is specifically used for transmitting data for the communication of circumscribed USB equipment and TV master chip, and when the circumscribed USB is set
When for being remote speech equipment, acoustic reference signal is passed back to remote speech equipment.
4. USB terminal interface circuit according to claim 3, which is characterized in that the first foot of the USB3.0 Interface Terminal
It connects to power supply, the crus secunda and third foot of the USB3.0 Interface Terminal are connect with TV master chip, the USB3.0 interface
4th foot of terminal and the 7th foot ground connection, the 5th foot, the 6th foot, octal and the 9th foot and mould of the USB3.0 Interface Terminal
Quasi- switch module connection.
5. USB terminal interface circuit according to claim 1 or claim 2, which is characterized in that the analog switch module includes simulation
Switch unit, output capacitance unit and input capacitance unit；The analog switch unit is specifically used for according to TV master chip
Signal is controlled to carry out on or off, to send back acoustic reference signal to USB interface terminal or not transmit to USB interface terminal
Echo reference signal；The output capacitance unit is specifically same as analog switch unit output filtering；The input capacitance unit tool
Body is used for analog switch unit input filter.
6. USB terminal interface circuit according to claim 5, which is characterized in that the analog switch unit includes that simulation is opened
It closes, the first output end, second output terminal, third output end and the 4th output end of the analog switch are electric with the output respectively
Hold unit connection, the first input end of the analog switch, the second input terminal, third input terminal and the 4th input terminal respectively with it is defeated
Enter capacitor cell connection, the control terminal of the analog switch is connect with TV master chip.
7. USB terminal interface circuit according to claim 6, which is characterized in that the output capacitance unit includes the first electricity
Appearance, the second capacitor, third capacitor and the 4th capacitor, the first capacitor are opened with the 5th foot of USB interface terminal and simulation respectively
The the first output end connection closed, second capacitor the second output with the 6th foot of USB interface terminal and analog switch respectively
End connection, the third capacitor connect with the third output end of the octal of USB interface terminal and analog switch respectively, and described the
Four capacitors are connect with the 4th output end of the 9th foot of the USB interface terminal and analog switch respectively.
8. USB terminal interface circuit according to claim 7, which is characterized in that the input capacitance unit includes the 5th electricity
Appearance, the 6th capacitor, the 7th capacitor and the 8th capacitor, the 5th capacitor, the 6th capacitor, the 7th capacitor and the 8th capacitor respectively with
The first input end of analog switch, the second input terminal, third input terminal and the connection of the 4th input terminal, the 5th capacitor, the 6th
Capacitor, the 7th capacitor and the 8th capacitor are also connect with power amplifier module.
9. a kind of USB terminal interface circuit control method, which comprises the steps of:
Circumscribed USB equipment accesses circuit, and is communicated by USB interface terminal with TV master chip；
Television set judges that the circumscribed USB equipment is far field speech ciphering equipment or other set by the received information of TV master chip
It is standby；
If judging the circumscribed USB equipment for far field speech ciphering equipment, high-level control signal is generated to mould by TV master chip
Quasi- switch module switches it on, while the analog switch module reception of echoes reference signal reaches USB interface terminal and sends
To far field speech ciphering equipment；If judging the circumscribed USB equipment for other equipment, low level control letter is generated by TV master chip
Number to analog switch module, analog switch module is made to keep low level off state；
After detecting that far field speech ciphering equipment is pulled out, TV master chip will control signal and switch to low level by high level, control
Analog switch module disconnects, into off state.
10. USB terminal interface circuit control method according to claim 9, which is characterized in that if judging described external
USB device is far field speech ciphering equipment, then generates high-level control signal to analog switch module by TV master chip and switch it on,
The analog switch module reception of echoes reference signal reaches USB interface terminal and is sent to far field speech ciphering equipment simultaneously；If sentencing
The circumscribed USB equipment of breaking is other equipment, then generates low level control signal to analog switch module by TV master chip, make
Analog switch module keep low level off state the step of include:
The filtering of echo reference signal is reached analog switch by input capacitance unit；
The echo reference signal is reached output capacitance unit and exported to USB interface terminal by analog switch；
The echo reference signal is reached far field speech ciphering equipment by USB interface terminal.
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| CN201910402622.XA CN110300318B (en) | 2019-05-15 | 2019-05-15 | USB terminal interface circuit and USB terminal interface circuit control method |
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|---|---|---|---|
| CN201910402622.XA CN110300318B (en) | 2019-05-15 | 2019-05-15 | USB terminal interface circuit and USB terminal interface circuit control method |
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| CN110300318B CN110300318B (en) | 2021-09-21 |
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