A kind of usb terminal interface circuit and usb terminal interface circuit control method
A technology of USB interface and interface circuit, which is applied in the field of USB terminal interface circuit and USB terminal interface circuit control, can solve the problems of occupying and wasting TV terminal resources, and achieve the effect of saving resources and avoiding the problem of non-recognition of equipment
Active Publication Date: 2021-09-21
深圳康佳电子科技有限公司
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Problems solved by technology
[0004] However, at present, the signal transmission of the external far-field voice module on the TV side adopts the method of USB data transmission and echo reference signal transmission through the headphone interface, which occupies two external terminals of the TV side at the same time, wasting the resources of the TV terminal
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[0031] In view of the shortcomings of using the USB to transmit data and the earphone interface to transmit the echo reference signal while occupying two external terminals of the TV terminal in the prior art, and wasting the resources of the TV terminal, the present invention adds An analog switch module implements an interface to perform data transmission with an external far-field audio device and transmit the echo reference signal back to the far-field audio device, saving TV terminal resources. And a further solution collects the amplified signal transmitted from the rear end of the power amplifier module to the speaker as the echo reference signal, which can effectively improve the echo cancellation effect of the far-field voice module.
[0032] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples....
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The invention discloses a USB terminal interface circuit and a method for controlling the USB terminal interface circuit. The USB terminal interface circuit is connected with an external USB device, and includes a TV main chip, a USB interface terminal and an analog switch module; when the external USB device is connected to After the circuit, the external USB device communicates with the TV main chip through the USB interface terminal, and the TV judges the type of the external USB device; if the external USB device is a far-field voice device, the high-level control signal generated by the TV main chip will simulate The switch module is turned on; at the same time, the analog switch module receives the echo reference signal and transmits it to the USB interface terminal and sends it to the far-field voice device; if the external USB device is other equipment, the main chip of the TV will generate a low-level control signal to turn off the analog switch module. open. In the present invention, an analog switch module is added between the USB interface terminal and the main chip of the TV, so that one interface can be used for data transmission with an external far-field audio device and the echo reference signal can be transmitted back to the far-field audio device.
Description
technical field [0001] The invention relates to the field of smart televisions, in particular to a USB terminal interface circuit and a method for controlling the USB terminal interface circuit. Background technique [0002] At present, most TVs have been adapted to the far-field voice module. The hardware of the far-field voice module is mainly divided into built-in modules and external modules at the TV end. The connection with the TV motherboard mainly includes Universal Serial Bus (hereinafter referred to as USB) signals. With the echo reference signal, after the remote voice device with an external module is connected to the TV, in the process of far-field speech recognition, the sound from the TV speaker needs to be eliminated, so it is necessary to return an echo reference signal from the TV to the far-field In the external module of the voice device, it provides reference data for the echo cancellation algorithm of the external far-field voice module. [0003] In th...
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IPC IPC(8): H04N21/426G06F13/42G06F13/40
CPCG06F13/4068G06F13/4282H04N21/426
Inventor 刘泽民林敏强蒋浩
Owner 深圳康佳电子科技有限公司