TWI687064B - Video stream data transmission method by universal serial bus and dual-lens dashboard camera using the same - Google Patents

Abstract

A video stream data transmission method by universal serial bus and a dual-lens dashboard camera using the same are provided in the present invention. The dual-lens dashboard camera includes a host device, a secondary camera device and a cable for connecting the host device and the secondary camera device. Since the cable may be very long, it cause the signal attenuation. In a preferred embodiment of the present invention, an equalizer is provided to the data receiver of the host device for amplifying the high frequency of the received signal. And the de-emphasis circuit is provided to data transmitter of the host device for reducing the strength of the low frequency part of the transmitting signal, therefore, the secondary camera device would receive a uniform signal from low frequency to high frequency. Thus, the High speed of USB 2.0 can be achieved.

Description

Image data transmission method of universal serial bus port and dual-lens driving recorder using the same

The invention relates to a technique for improving the accuracy of transmission line data. Further, the invention relates to a method for transmitting image data of a universal serial bus port and a dual-lens driving recorder using the same.

With the vigorous development of science and technology, in the era of mass automobile popularization, in order to avoid driving disputes, the driving recorder is widely used and its functions are becoming more and more diversified. Generally, the driving recorder is basically a single-lens driving recorder. Such a driving recorder can only record one side. If there is video recording before and after, the driving recorder needs to be installed two.

In order to improve such problems, manufacturers have developed a dual-lens driving recorder. With a host, coupled with a line and another lens, you can record before and after pictures. However, the average car body is about four to five meters. After deducting the front and rear parts, the wire generally needs to be at least three meters. Ensure that the length of the wire is long enough, and for the convenience of installation, the driving recorder manufacturer usually needs to provide at least five meters of wire.

In addition, if the five-meter wire meets the specifications of the universal serial bus 2.0, the price is quite expensive. Due to the cost of ordinary driving recorder manufacturers, the rear lens often uses low-resolution recording to reduce the image data to a level that conforms to the general serial bus 1.1 (about 12Mbps) to avoid recording interruption. However, Universal Serial Bus 1.1 can only transmit the highest resolution of about 720*480. If an accident occurs, the image recorded by the rear lens is not as clear as the image recorded by the front lens, resulting in weak evidence of the recorded image.

An object of the present invention is to provide an image data transmission method of a universal serial bus port and a dual-lens driving recorder using the same. By additionally providing a circuit at the host end or the lens end, the amount of data that can be transmitted by the high attenuation wire can be transmitted At least meet the specifications of Universal Serial Bus 2.0.

In view of this, the present invention provides a dual-lens driving recorder. The dual-lens driving recorder includes a host device, a cable and a pair of lens devices. The host device includes a main lens camera, a storage device, a first universal serial bus transmission interface, an equalizer circuit, a first control circuit, and a de-emphasis circuit. The main lens camera is used for image recording. The first universal serial bus transmission interface includes a positive data terminal and a negative data terminal. The equalizer circuit includes a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal, wherein the positive input terminal of the equalizer circuit is coupled to the positive data terminal of the first universal serial bus port, The negative input terminal of the equalizer circuit is coupled to the negative data terminal of the first universal serial bus port, wherein the equalizer circuit is used to input the positive data terminal and the negative data terminal of the first universal serial bus transmission interface Enlarge the high frequency band of the data. The first control circuit is coupled to the main lens camera, the storage device, the first universal serial bus transmission interface, and the equalizer circuit. The de-emphasis circuit is coupled to the first control circuit and the universal serial bus transmission interface to de-emphasize the data that the first control circuit wants to transmit to the first universal serial bus transmission interface to reduce low frequency response.

The cable includes a first end and a second end, wherein the first end of the cable is coupled to the first universal serial bus transmission interface, wherein the length of the cable is at least greater than two meters. The secondary lens device includes a secondary lens camera, a second universal serial bus transmission interface, and a second control circuit. The sub-lens camera is used for image recording. The second universal serial bus transmission interface includes a positive data terminal and a negative data terminal, wherein the second universal serial bus transmission interface is coupled to the second end of the cable. The second control circuit is coupled to the sub-lens camera and the second universal serial bus transmission interface.

When the sub-lens device transmits the image data captured by the sub-lens camera to the host device, the second control circuit controls the second universal serial bus transmission interface to transmit the image data captured by the sub-lens camera. When the host device receives the data through the first universal serial bus transmission interface, the equalizer circuit amplifies the high frequency band of the data received at the positive input terminal and the negative input terminal, so that the first control circuit obtains the correct data to store Save to storage device. When the first control circuit of the host device returns a return data to the sub-lens device, the de-emphasis circuit de-emphasizes the returned data to reduce the low-frequency response, so that the sub-lens device can correctly receive the above-mentioned return data.

The invention additionally provides a method for transmitting image data of a universal serial bus port, which is suitable for a dual-lens driving recorder, wherein the dual-lens driving recorder includes a host device, a pair of lens devices, and a connection between the host device and the sub lens One of the cables of the device, where the length of the cable is greater than two meters, the method of image data transmission of this universal serial bus port includes the following steps: an equalizer circuit is provided at the data receiving end of the host device to convert the received High-frequency amplification of the signal; and provide a de-emphasis circuit at the data output end of the host device to reduce the intensity of the low frequency of the output signal, so that the high and low frequency signals received by the sub lens device are consistent.

According to the image data transmission method of the universal serial bus port and the dual-lens driving recorder using the same according to the preferred embodiment of the present invention, the equalizer circuit includes a first resistor, a second resistor, and a first Transistor, a second transistor, a third transistor, a fourth transistor, a capacitor and an adjustable resistance. The first end of the first resistor is coupled to a power supply voltage. The first end of the second resistor is coupled to the power supply voltage. The gate of the first transistor is coupled to the positive data terminal of the first universal serial bus transmission interface, and the first source-drain of the first transistor is coupled to the second terminal of the first resistor and the positive output terminal of the equalizer. The gate of the second transistor is coupled to the negative data terminal of the transmission interface of the first universal serial bus. The source drain is coupled to the second terminal of the second resistor and the negative output terminal of the equalizer. The gate of the third transistor is coupled to a first bias voltage, the first source-drain of the third transistor is coupled to the second source-drain of the first transistor, and the second source-drain of the third transistor is coupled Connect a total of voltage. The gate of the fourth transistor is coupled to the first bias voltage, the first source-drain of the fourth transistor is coupled to the second source-drain of the second transistor, and the second source-drain of the fourth transistor is coupled to Connect voltage. The first end of the capacitor is coupled to the second source and drain of the first transistor, and the second end of the capacitor is coupled to the second source and drain of the second transistor. The first end of the adjustable resistor is coupled to the second source and drain of the first transistor, the second end of the adjustable resistor is coupled to the second source and drain of the second transistor, and the adjustable end of the adjustable resistor is coupled to the The first control circuit, wherein the first control circuit adjusts the resistance value of the adjustable resistor to adjust the high-frequency gain of the equalizer circuit.

According to the image data transmission method of the universal serial bus port and the dual-lens driving recorder using the same according to the preferred embodiment of the present invention, the de-emphasis circuit includes a delay circuit, a first gain circuit, and an addition circuit. The delay circuit includes an input terminal and an output terminal, wherein the input terminal of the delay circuit receives a sequence of data from the first control circuit and delays output after a preset time. The first gain circuit includes an input terminal, a gain adjustment terminal and an output terminal, wherein the input terminal receives sequence data from the first control circuit, wherein the gain adjustment terminal of the first gain circuit is coupled to the first control circuit, wherein, The first gain circuit is used to multiply the received data by a gain and output it to the output end of the first gain circuit. The addition circuit includes a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the addition circuit is coupled to the output terminal of the delay circuit, The second input terminal of the method circuit is coupled to the output terminal of the first gain circuit, wherein the addition circuit is used to subtract the signal of the first input terminal and the signal of the second input terminal for de-emphasis.

The invention additionally provides a dual-lens driving recorder. The dual-lens driving recorder includes a host device, a cable and a pair of lens devices. The host device includes a main lens camera, a storage device, a first control circuit, and a first universal serial bus transmission interface. The main lens camera is used for image recording. The first control circuit is coupled to the main lens camera, the storage device, and the first universal serial bus transmission interface. The first universal serial bus transmission interface includes a positive data terminal and a negative data terminal. The cable includes a first end and a second end, wherein the first end of the cable is coupled to the first universal serial bus transmission interface, wherein the length of the cable is at least greater than two meters.

The secondary lens device includes a secondary lens camera, a second universal serial bus transmission interface, an equalizer circuit, a second control circuit, and a de-emphasis circuit. The sub-lens camera is used for image recording. The second universal serial bus transmission interface includes a positive data terminal and a negative data terminal, wherein the second universal serial bus transmission interface is coupled to the second end of the cable. The equalizer circuit includes a positive input terminal, a negative input terminal, a positive output terminal and a negative output terminal, wherein the positive input terminal of the equalizer circuit is coupled to the positive data terminal of the second universal serial bus port, The negative input terminal of the equalizer circuit is coupled to the negative data terminal of the second universal serial bus port, wherein the equalizer circuit is used to input the positive data terminal and the negative data terminal of the second universal serial bus transmission interface High frequency band To zoom in.

The second control circuit is coupled to the sub-lens camera, the second universal serial bus transmission interface, and the equalizer circuit. The de-emphasis circuit is coupled to the second control circuit and the second universal serial bus transmission interface to de-emphasize the data that the second control circuit wants to transmit to the second universal serial bus transmission interface to reduce the low frequency response.

When the sub-lens device transmits the image data captured by the sub-lens camera to the host device, the de-emphasis circuit de-emphasizes the image data to reduce the low-frequency response, so that the host device can correctly receive the image data. When the sub-lens device receives data through the second universal serial bus transmission interface, the equalizer circuit amplifies the high frequency band of the data received by the positive input terminal and the negative input terminal of the second universal serial bus transmission interface, so that the first The second control circuit obtains the correct information.

The invention additionally provides a method for transmitting image data of a universal serial bus port, which is suitable for a dual-lens driving recorder, wherein the dual-lens driving recorder includes a host device, a pair of lens devices, and a host device and the auxiliary lens One of the cables of the equipment, where the length of the cable is more than two meters, and the image data transmission method of the universal serial bus port includes the following steps: an equalizer circuit is provided at the data receiving end of the sub-lens device High-frequency amplification of the received signal; and providing a de-emphasis circuit at the data output end of the sub-lens device to reduce the intensity of the low frequency of the output signal to make the high and low frequency signals received by the sub-lens device consistent .

According to the general sequence described in the preferred embodiment of the present invention Image data transmission method of serial bus port and dual-lens driving recorder using the same, the above-mentioned equalizer circuit includes a first resistor, a second resistor, a first transistor, a second transistor, a first Three transistors, a fourth transistor, a capacitor, and an adjustable resistance. The first end of the first resistor is coupled to a power supply voltage. The first end of the second resistor is coupled to the power supply voltage. The gate of the first transistor is coupled to the positive data terminal of the first universal serial bus transmission interface, and the first source-drain of the first transistor is coupled to the second terminal of the first resistor and the positive output terminal of the equalizer. The gate of the second transistor is coupled to the negative data terminal of the first universal serial bus transmission interface, and the first source drain of the second transistor is coupled to the second terminal of the second resistor and the negative output terminal of the equalizer. The gate of the third transistor is coupled to a first bias voltage, the first source-drain of the third transistor is coupled to the second source-drain of the first transistor, and the second source-drain of the third transistor is coupled Connect a total of voltage. The gate of the fourth transistor is coupled to the first bias voltage, the first source-drain of the fourth transistor is coupled to the second source-drain of the second transistor, and the second source-drain of the fourth transistor is coupled to Connect voltage. The first end of the capacitor is coupled to the second source and drain of the first transistor, and the second end of the capacitor is coupled to the second source and drain of the second transistor. The first end of the adjustable resistor is coupled to the second source and drain of the first transistor, the second end of the adjustable resistor is coupled to the second source and drain of the second transistor, and the adjustable end of the adjustable resistor is coupled to the The first control circuit, wherein the first control circuit adjusts the resistance value of the adjustable resistor to adjust the high-frequency gain of the equalizer circuit.

According to the image data transmission method of the universal serial bus port and the dual-lens driving recorder using the same according to the preferred embodiment of the present invention, the de-emphasis circuit includes a delay circuit and a first Benefit circuit and an addition circuit. The delay circuit includes an input terminal and an output terminal, wherein the input terminal of the delay circuit receives a sequence of data by the second control circuit and delays output after a preset time. The first gain circuit includes an input terminal, a gain adjustment terminal and an output terminal, wherein the input terminal of the first gain circuit is coupled to the output terminal of the delay circuit, wherein the gain adjustment terminal of the first gain circuit is coupled to the first control Circuit, wherein the first gain circuit is used to multiply the received data by a gain and output to the output end of the first gain circuit. The addition circuit includes a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the addition circuit receives the serial data from the first control circuit, and the second input terminal of the addition circuit is coupled to the first The output terminal of the gain circuit, wherein the addition circuit is used to subtract the signal of the first input terminal and the signal of the second input terminal for de-emphasis.

The spirit of the present invention is to use the equalizer circuit to amplify the high-frequency part of the received data, thereby amplifying the received data to a recognizable level, so that the high attenuation wire can achieve high-speed transmission. Similarly, the de-emphasis circuit de-emphasizes the transmitted data to reduce the low-frequency response. Therefore, after the transmission through the high attenuation long cable, the low frequency and high frequency can be consistent, so that the receiver can recognize the high speed data. In this way, the resolution of the lens behind the dual-lens driving recorder can be increased.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described below in conjunction with the accompanying drawings, which are described in detail below.

101‧‧‧Host equipment

102‧‧‧Sub lens equipment

103‧‧‧Cable

104‧‧‧main lens camera

106‧‧‧Storage device

107‧‧‧Universal serial bus transmission interface

108‧‧‧Equalizer circuit

109‧‧‧Control circuit

110‧‧‧de-emphasis circuit

111‧‧‧ Sub lens camera

112‧‧‧Universal serial bus transmission interface

113‧‧‧Control circuit

R1‧‧‧ First resistance

R2‧‧‧Second resistance

T1‧‧‧ First transistor

T2‧‧‧second transistor

T3‧‧‧third transistor

T4‧‧‧ fourth transistor

C1‧‧‧Capacitance

RX‧‧‧adjustable resistance

VDD‧‧‧Power supply voltage

VB‧‧‧First bias

VCOM‧‧‧Common connection voltage

601‧‧‧ Delay circuit

602‧‧‧Gain circuit

603‧‧‧Addition circuit

701‧‧‧Equalizer circuit

702‧‧‧De-emphasis circuit

703‧‧‧Control circuit

S801~S802, S901~S902 ‧‧‧ The process steps of the image data transmission method of the universal serial bus port of a preferred embodiment of the present invention

FIG. 1 is a circuit diagram of a dual-lens driving recorder according to a preferred embodiment of the present invention.

FIG. 2A is a waveform diagram of data of a sub-lens device 102 of a dual-lens driving recorder according to a preferred embodiment of the present invention through a six-meter transmission line without processing by an equalizer circuit 108. FIG.

FIG. 2B is an eye diagram of data of the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention, which passes through a six-meter transmission line and is not processed by the equalizer circuit 108.

FIG. 3 is a Bode plot of gain of the equalizer circuit 108 of the dual-lens driving recorder according to a preferred embodiment of the present invention.

FIG. 4A shows a waveform diagram of data processed by the equalizer circuit 108 through the six-meter transmission line of the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention.

FIG. 4B shows an eye diagram of data processed by the equalizer circuit 108 through the six-meter transmission line of the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention.

FIG. 5 is a circuit diagram of an equalizer circuit 108 of a dual-lens driving recorder according to a preferred embodiment of the present invention.

FIG. 6 is a circuit diagram of a de-emphasis circuit 110 of a dual-lens driving recorder according to a preferred embodiment of the present invention.

FIG. 6A is a waveform diagram of data processed by the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention through a six-meter transmission line and processed by a de-emphasis circuit 110. FIG.

FIG. 6B is an eye diagram of data processed by the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention through a six-meter transmission line and processed by a de-emphasis circuit 110.

FIG. 7 is a circuit diagram of a dual-lens driving recorder according to a preferred embodiment of the present invention.

FIG. 8 is a flowchart of an image data transmission method of a universal serial bus port according to a preferred embodiment of the present invention.

FIG. 9 is a flowchart of an image data transmission method of a universal serial bus port according to a preferred embodiment of the present invention.

FIG. 1 is a circuit diagram of a dual-lens driving recorder according to a preferred embodiment of the present invention. Please refer to FIG. 1, the dual-lens driving recorder includes a host device 101, a pair of lens devices 102, and a cable 103 connecting the host device 101 and the sub lens device 102. The host device 101 includes a main lens camera 104, a storage device 106, a universal serial bus transmission interface 107, an equalizer circuit 108, a control circuit 109, and a de-emphasis circuit 110. The sub-lens device 102 includes a sub-lens camera 111, a universal serial bus transmission interface 112, and a control circuit 113. The coupling relationship is shown in the figure.

The length of the cable 103 is generally greater than two meters, and the more commonly used length is about five to six meters. In addition, the host device 101 and the sub-lens device 102 are transmitted through the universal serial bus port 2.0 specification, and the transmission rate is 480 Mbps. Due to the host equipment of this type of driving recorder 101 has a main lens camera 104, and the sub-lens device 102 has a sub-lens camera 111, so the sub-lens device 102 needs to transmit the recorded image to the host device 101, and the host device 101 stores it in a storage device 106, such as a memory card 106.

In addition, the cable generally used in the driving recorder usually does not meet the specifications of the universal serial bus port 2.0. In addition to the less core wire used, the general headphone terminal (TRS Connector) is often used at the connector part. Insufficient will cause high-frequency loss, and the headphone terminal will cause high-frequency loss to increase. In this embodiment, in the data receiving circuit of the host device 101, an equalizer circuit 108 is added. The equalizer circuit 108 includes a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal. The positive input terminal of the equalizer circuit 108 is coupled to the D+ terminal of the serial bus connection port, and the negative side of the equalizer circuit 108 The input terminal is coupled to the D-terminal of the serial bus connection port, and the positive output terminal and the negative output terminal of the equalizer circuit 108 are coupled to the control circuit 109 of the host device. The equalizer circuit 108 differentially amplifies the high frequency part of the received data. In other words, after the attenuated high frequency is amplified, the subsequent control circuit 109 can recognize the data and store the image data to the storage device In 106, even if the data rate reaches the high-speed transmission of the universal serial bus port 2.0, the image data will not be lost.

FIG. 2A is a waveform diagram of data of a sub-lens device 102 of a dual-lens driving recorder according to a preferred embodiment of the present invention through a six-meter transmission line without processing by an equalizer circuit 108. FIG. FIG. 2B shows the data of the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention through a six-meter transmission line without processing by the equalizer circuit 108. Material eye diagram. Please refer to Figure 2 and Figure 3 at the same time. As can be seen from Figure 2, the waveform of the higher frequency data passes through the transmission line and the signal is severely attenuated. The eye diagram in Figure 3 does not meet the specifications of Universal Serial Bus Port 2.0, and the data is basically unrecognizable.

FIG. 3 is a Bode plot of gain of the equalizer circuit 108 of the dual-lens driving recorder according to a preferred embodiment of the present invention. Please refer to FIG. 3, in this embodiment, for the specification of the universal serial bus port 2.0 and the characteristics of the transmission line, the high frequency gain is increased, while the low frequency gain is reduced, so that the overall frequency response is shown in FIG. 3. FIG. 4A shows a waveform diagram of data processed by the equalizer circuit 108 through the six-meter transmission line of the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention. FIG. 4B shows an eye diagram of data processed by the equalizer circuit 108 through the six-meter transmission line of the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention. Please refer to FIG. 4A and FIG. 4B. After the equalizer circuit 108 is used to amplify the high frequency, the jitter of the eye diagram is already less than 350ps, so the host device 101 can already recognize the sub lens device 102 through the cable 103 The transmitted image.

The above embodiment relates to the host device 101 receiving the image data transmitted by the sub lens device 102. However, the universal serial bus port 2.0 still needs to send back data from the host device 101 to the secondary lens device 102 to perform the handshake confirmation action and other responses. In this embodiment, the host device further includes a de-emphasis circuit (De-emphasis) 110. The function of the de-emphasis circuit 110 is to control the host device 101 The data returned by the circuit 109 reduces the strength of the low frequency signal. With the characteristics of the high attenuation cable 103, the high and low frequency ends of the spectrum tend to be consistent, thereby allowing the secondary lens device 102 to receive the return data transmitted by the host device 101 at the speed of the universal serial bus port 2.0 .

FIG. 5 is a circuit diagram of an equalizer circuit 108 of a dual-lens driving recorder according to a preferred embodiment of the present invention. Please refer to FIG. 5, the equalizer circuit 108 includes a first resistor R1, a second resistor R2, a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor Crystal T4, a capacitor C1 and an adjustable resistor RX. The first terminal of the first resistor R1 is coupled to a power supply voltage VDD. The first end of the second resistor R2 is coupled to the power supply voltage VDD. The gate of the first transistor T1 is coupled to the positive data terminal D+ of the serial bus transmission interface. The first source drain of the first transistor T1 is coupled to the second terminal of the first resistor R1 and serves as an equalizer circuit The positive output of 108. The gate of the second transistor T2 is coupled to the negative data terminal D- of the serial bus transmission interface. The first source drain of the second transistor T2 is coupled to the second terminal of the second resistor R2 and serves as an equalizer The negative output of circuit 108. The gate of the third transistor T3 is coupled to a first bias voltage VB, the first source-drain of the third transistor T3 is coupled to the second source-drain of the first transistor T1, and the second of the third transistor T3 The source drain is coupled to a common voltage VCOM.

The gate of the fourth transistor T4 is coupled to the first bias voltage VB, the first source drain of the fourth transistor T4 is coupled to the second source drain of the second transistor T2, and the second source of the fourth transistor T4 The drain is coupled to the common voltage VCOM. The first end of the capacitor C1 is coupled to the second source and drain of the first transistor T1, and the second end of the capacitor C1 is coupled to the second and second source and drain of the transistor T2. The first end of the adjustable resistor RX is coupled to the second source-drain of the first transistor T1, the second end of the adjustable resistor RX is coupled to the second source-drain of the second transistor T2, and the adjustment of the resistance RX can be adjusted端联连接控制电路109。 The end coupling control circuit 109. The control circuit 109 sets the required de-generation intensity by adjusting the resistance value of the adjustable resistor RX, whereby the high-frequency gain can be flexibly adjusted. In this way, the flatness of the signal can be effectively compensated. Generally speaking, the circuit design will do several different controls, this circuit is mainly for low frequency attenuation.

FIG. 6 is a circuit diagram of a de-emphasis circuit 110 of a dual-lens driving recorder according to a preferred embodiment of the present invention. Referring to FIG. 6, the de-emphasis circuit 110 includes a delay circuit 601, a gain circuit 602, and an addition circuit 603. The input terminal of the delay circuit 601 receives a sequence of data from the control circuit 109, and outputs it after being delayed for a preset time by the output terminal of the delay circuit 601. The gain circuit 602 includes an input terminal, a gain adjustment terminal and an output terminal, wherein the input terminal of the gain circuit 602 is coupled to the output terminal of the delay circuit 601, wherein the gain adjustment terminal of the gain circuit 602 is coupled to the control circuit 109, wherein The gain circuit 602 is used to multiply the received data by a gain and output it to the output end of the gain circuit 602. The addition circuit 603 includes a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal of the addition circuit 603 receives the sequence data from the control circuit 109, and the second input terminal of the addition circuit 603 is coupled to the gain circuit 602 output. The addition circuit 603 is used to subtract the signal from the first input terminal and the signal from the second input terminal for de-emphasis.

FIG. 6A illustrates a preferred embodiment of the invention The waveform diagram of the data processed by the auxiliary lens device 102 of the dual-lens driving recorder through the six-meter transmission line and processed by the de-emphasis circuit 110. FIG. 6B is an eye diagram of data processed by the auxiliary lens device 102 of the dual-lens driving recorder according to a preferred embodiment of the present invention through a six-meter transmission line and processed by a de-emphasis circuit 110. Please refer to FIGS. 6A and 6B. After the de-emphasis circuit 110 attenuates the low frequency, the jitter of the eye diagram is already less than 110 ps, so the sub-lens device 102 can already recognize the transmission through the cable 103 image.

The above embodiment takes the example that the host device 101 is provided with an equalizer circuit 108 and a de-emphasis circuit 110 as an example. However, those of ordinary skill in the art can refer to the embodiments of the present invention to understand that if the above equalizer circuit 108 is used And the de-emphasis circuit 110 is installed in the sub-lens device 102, and can also perform high-speed data transmission of the universal serial bus port 2.0. As shown in FIG. 7, FIG. 7 is a circuit diagram of a dual-lens driving recorder according to a preferred embodiment of the present invention. Please refer to FIGS. 1 and 7. In the embodiment of FIG. 7, the equalizer circuit 701 and the de-emphasis circuit 702 are provided in the sub-lens device 102 and controlled by the control circuit 703. For the same reason, when the sub-lens device 102 transmits the image data captured by the sub-lens camera to the host device, the de-emphasis circuit 702 de-emphasizes the image data to reduce the low-frequency response, so that the host device 101 can correctly receive the image data. When the sub-lens device receives data through the universal serial bus transmission interface, the equalizer 701 amplifies the high frequency band of the data received by the positive input terminal and the negative input terminal of the universal serial bus transmission interface, so that the control circuit 703 obtains the correct data.

FIG. 8 is a flowchart of an image data transmission method of a universal serial bus port according to a preferred embodiment of the present invention. Please refer to Figure 8 and Figure 1. The image data transmission method of this universal serial bus port is applicable to a dual-lens driving recorder, in which the dual-lens driving recorder includes a host device and a pair of A lens device and a cable connecting the host device and the auxiliary lens device, wherein the length of the cable is greater than two meters, and the image data transmission method of the universal serial bus connection port includes the following steps:

Step S801: Provide an equalizer circuit at the data receiving end of the host device to amplify the high frequency of the received signal.

Step S802: Provide a de-emphasis circuit at the data output end of the host device to reduce the intensity of the low frequency of the output signal to make the high and low frequency signals received by the sub-lens device consistent.

FIG. 9 is a flowchart of an image data transmission method of a universal serial bus port according to a preferred embodiment of the present invention. Please refer to Figure 9 and Figure 7, this universal serial bus port image data transmission method is suitable for a dual-lens driving recorder, in which the dual-lens driving recorder includes a host device as shown in Figure 1, a pair of The lens device and the cable connecting the host device and the auxiliary lens device. Similarly, the length of the cable is greater than two meters. The image data transmission method of the universal serial bus port includes the following steps:

Step S901: Provide an equalizer circuit at the data receiving end of the sub-lens device to amplify the high frequency of the received signal.

Step S902: Data output at the sub lens device The end provides a de-emphasis circuit to reduce the intensity of the low frequency of the output signal, so that the high and low frequency signals received by the sub-lens device are consistent.

In summary, the spirit of the present invention is to use the equalizer circuit to amplify the high frequency part of the received data, thereby amplifying the received data to a recognizable level, so that the high attenuation wire can achieve high speed transmission . Similarly, the de-emphasis circuit de-emphasizes the transmitted data to reduce the low-frequency response. Therefore, after the transmission through the high attenuation long cable, the low frequency and high frequency can be consistent, so that the receiver can recognize the high speed data. In this way, the resolution of the lens behind the dual-lens driving recorder can be increased.

The specific embodiments proposed in the detailed description of the preferred embodiments are only used to facilitate the description of the technical content of the present invention, rather than limiting the present invention to the above embodiments in a narrow sense, without exceeding the spirit of the present invention and applying for patents below The scope of the scope and the various changes and implementations are all within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined in the appended patent application.

101‧‧‧Host equipment

102‧‧‧Sub lens equipment

103‧‧‧Cable

104‧‧‧main lens camera

106‧‧‧Storage device

107‧‧‧Universal serial bus transmission interface

108‧‧‧Equalizer circuit

109‧‧‧Control circuit

110‧‧‧de-emphasis circuit

111‧‧‧ Sub lens camera

112‧‧‧Universal serial bus transmission interface

113‧‧‧Control circuit

Claims (4)

A dual-lens driving recorder includes: a host device, including: a main lens camera for image recording; a storage device; a first universal serial bus transmission interface, including a positive data terminal and a negative data terminal An equalizer circuit, including a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal, wherein the positive input terminal of the equalizer circuit is coupled to the first universal serial bus port Positive data terminal, the negative input terminal of the equalizer circuit is coupled to the negative data terminal of the first universal serial bus port, wherein the equalizer circuit is used for transmitting the first universal serial bus interface The high frequency band of the data input from the positive data terminal and the negative data terminal is amplified; a first control circuit is coupled to the main lens camera, the storage device, the first universal serial bus transmission interface and the equalizer circuit; A de-emphasis circuit, coupled to the first control circuit and the universal serial bus transmission interface, is used to de-emphasize the data that the first control circuit wants to transmit to the first universal serial bus transmission interface to reduce low frequency response ; And a cable, including a first end and a second end, wherein the first end of the cable is coupled to the first universal serial bus transmission interface, wherein the length of the cable is at least greater than two meters ;as well as A pair of lens devices, including: a pair of lens cameras for image recording; a second universal serial bus transmission interface, including a positive data terminal and a negative data terminal, wherein the second universal serial bus transmission interface Coupled to the second end of the cable; and a second control circuit coupled to the sub-lens camera and the second universal serial bus transmission interface; wherein, when the sub-lens device transmits the images captured by the sub-lens camera When the image data is transmitted to the host device, the second control circuit controls the second universal serial bus transmission interface to transmit the image data captured by the sub-lens camera. When the host device receives the data through the first universal serial bus transmission interface , The equalizer circuit amplifies the high frequency band of the data received by the positive input terminal and the negative input terminal, so that the first control circuit obtains the correct data for storage in the storage device, when the first of the host device The control circuit returns a return data to the sub-lens device, and the de-emphasis circuit de-emphasizes the returned data to reduce the low-frequency response, so that the sub-lens device can correctly receive the returned data. The equalizer The circuit includes: a first resistor including a first terminal and a second terminal, wherein the first terminal of the first resistor is coupled to a power supply voltage; a second resistor includes a first terminal and a second terminal Where the first end of the second resistor is coupled to the power supply voltage; a first transistor includes a first source drain and a second source drain And a gate, wherein the gate of the first transistor is coupled to the positive data terminal of the first universal serial bus transmission interface, and the first source drain of the first transistor is coupled to the first of the first resistor Two terminals and the positive output terminal of the equalizer; a second transistor including a first source drain, a second source drain and a gate, wherein the gate of the second transistor is coupled to the The negative data terminal of the first universal serial bus transmission interface, the first source drain of the second transistor is coupled to the second terminal of the second resistor and the negative output terminal of the equalizer; a third transistor, It includes a first source drain, a second source drain, and a gate, wherein the gate of the third transistor is coupled to a first bias voltage, and the first source drain of the third transistor is coupled A second source and drain of the first transistor, a second source and drain of the third transistor are coupled to a common voltage; a fourth transistor includes a first source and drain, a second source and drain A gate, wherein the gate of the fourth transistor is coupled to the first bias voltage, the first source drain of the fourth transistor is coupled to the second source drain of the second transistor, the fourth The second source drain of the transistor is coupled to the common voltage; a capacitor includes a first terminal and a second terminal, wherein the first terminal of the capacitor is coupled to the second source drain of the first transistor , The second end of the capacitor is coupled to the second source-drain of the second transistor; and an adjustable resistor, including a first end, a second end, and an adjustment end, wherein the first of the adjustable resistance One end is coupled to the second source and drain of the first transistor, the second end of the adjustable resistor is coupled to the second source and drain of the second transistor, and the adjustable end of the adjustable resistor is coupled to the first A control circuit, wherein the first control circuit adjusts the resistance value of the adjustable resistor to adjust the high-frequency gain of the equalizer circuit. A dual-lens driving recorder includes: a host device, including: a main lens camera for image recording; a storage device: a first universal serial bus transmission interface, including a positive data terminal and a negative data terminal An equalizer circuit, including a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal, wherein the positive input terminal of the equalizer circuit is coupled to the first universal serial bus port Positive data terminal, the negative input terminal of the equalizer circuit is coupled to the negative data terminal of the first universal serial bus port, wherein the equalizer circuit is used for transmitting the first universal serial bus interface The high frequency band of the data input from the positive data terminal and the negative data terminal is amplified; a first control circuit is coupled to the main lens camera, the storage device, the first universal serial bus transmission interface and the equalizer circuit; A de-emphasis circuit, coupled to the first control circuit and the universal serial bus transmission interface, is used to de-emphasize the data that the first control circuit wants to transmit to the first universal serial bus transmission interface to reduce low frequency response ; And a cable, including a first end and a second end, wherein the first end of the cable is coupled to the first universal serial bus transmission interface, wherein the length of the cable is at least greater than two meters ;as well as A pair of lens devices, including: a pair of lens cameras for image recording; a second universal serial bus transmission interface, including a positive data terminal and a negative data terminal, wherein the second universal serial bus transmission interface Coupled to the second end of the cable; and a second control circuit coupled to the sub-lens camera and the second universal serial bus transmission interface; wherein, when the sub-lens device transmits the images captured by the sub-lens camera When the image data is transmitted to the host device, the second control circuit controls the second universal serial bus transmission interface to transmit the image data captured by the sub-lens camera. When the host device receives the data through the first universal serial bus transmission interface , The equalizer circuit amplifies the high frequency band of the data received by the positive input terminal and the negative input terminal, so that the first control circuit obtains the correct data for storage in the storage device, when the first of the host device The control circuit returns a return data to the sub-lens device, and the de-emphasis circuit de-emphasizes the returned data to reduce the low-frequency response, so that the sub-lens device can correctly receive the returned data, wherein the de-emphasis circuit It includes: a delay circuit including an input terminal and an output terminal, wherein the input terminal of the delay circuit receives a sequence of data from the first control circuit and delays output after a preset time; a first gain circuit includes: An input terminal, a gain adjustment terminal and an output terminal, wherein the input terminal of the first gain circuit is coupled to the delay circuit The output terminal of the first gain circuit is coupled to the first control circuit, wherein the first gain circuit is used to multiply the received data by a gain and output to the first gain circuit An output terminal; and an addition circuit including a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal of the addition circuit receives the serial data from the first control circuit, and the addition circuit The second input terminal is coupled to the output terminal of the first gain circuit, wherein the addition circuit is used to subtract the signal of the first input terminal and the signal of the second input terminal for de-emphasis. A dual-lens driving recorder includes: a host device, including: a main lens camera for image recording; a storage device; a first universal serial bus transmission interface, including a positive data terminal and a negative data terminal A first control circuit, coupled to the main lens camera, the storage device and the first universal serial bus transmission interface; a cable, including a first end and a second end, wherein, the cable One end is coupled to the first universal serial bus transmission interface, wherein the length of the cable is at least greater than two meters; and a pair of lens devices, including: a pair of lens cameras for image recording: a second universal Serial bus transmission interface, including a positive data terminal and a negative data terminal, wherein the second universal serial bus transmission interface Is coupled to the second end of the cable; and an equalizer circuit includes a positive input terminal, a negative input terminal, a positive output terminal, and a negative output terminal, wherein the positive input terminal of the equalizer circuit The positive data terminal of the second universal serial bus port is coupled, and the negative input terminal of the equalizer circuit is coupled to the negative data terminal of the second universal serial bus port, wherein the equalizer circuit is used to Amplify the high frequency band of the data input from the positive data terminal and the negative data terminal of the second universal serial bus transmission interface; a second control circuit is coupled to the sub-lens camera and the second universal serial bus transmission interface And an equalizer circuit; a de-emphasis circuit, coupled to the second control circuit and the second universal serial bus transmission interface, for transmitting the second control circuit to the second universal serial bus transmission interface De-emphasizes the data to reduce the low frequency response; and wherein when the sub-lens device transmits the image data captured by the sub-lens camera to the host device, the de-emphasis circuit de-emphasizes the image data to reduce the low frequency response, To enable the host device to correctly receive the image data, when the secondary lens device receives data through the second universal serial bus transmission interface, the equalizer circuit connects the positive input end of the second universal serial bus transmission interface with The high frequency band of the data received by the negative input terminal is amplified to enable the second control circuit to obtain correct data. The equalizer circuit includes: a first resistor including a first terminal and a second terminal, wherein, The The first terminal of the first resistor is coupled to a power voltage; a second resistor includes a first terminal and a second terminal, wherein the first terminal of the second resistor is coupled to the power voltage; a first transistor , Including a first source drain, a second source drain, and a gate, wherein the gate of the first transistor is coupled to the positive data terminal of the first universal serial bus transmission interface, the first power The first source-drain of the crystal is coupled to the second end of the first resistor and the positive output of the equalizer; a second transistor includes a first source-drain, a second source-drain and a gate Wherein the gate of the second transistor is coupled to the negative data terminal of the first universal serial bus transmission interface, the first source drain of the second transistor is coupled to the second terminal of the second resistor and The negative output of the equalizer; a third transistor, including a first source drain, a second source drain, and a gate, wherein the gate of the third transistor is coupled to a first bias Voltage, the first source drain of the third transistor is coupled to the second source drain of the first transistor, the second source drain of the third transistor is coupled to a common voltage; a fourth transistor, It includes a first source drain, a second source drain, and a gate, wherein the gate of the fourth transistor is coupled to the first bias voltage, and the first source drain of the fourth transistor is coupled The second source drain of the second transistor, the second source drain of the fourth transistor is coupled to the common voltage; a capacitor includes a first terminal and a second terminal, wherein the first One end is coupled to the second source and drain of the first transistor, the second end of the capacitor is coupled to the second source and drain of the second transistor; and an adjustable resistance includes a first end and a first Two ends and an adjusting end, wherein the first end of the adjustable resistor is coupled to the first end of the first transistor Two source drains, the second end of the adjustable resistor is coupled to the second source drain of the second transistor, the adjustable end of the adjustable resistor is coupled to the first control circuit, wherein the first control circuit is adjusted by The resistance value of the resistor can be adjusted to adjust the high-frequency gain of the equalizer circuit. A dual-lens driving recorder includes: a host device, including: a main lens camera for image recording; a storage device; a first universal serial bus transmission interface, including a positive data terminal and a negative data terminal A first control circuit, coupled to the main lens camera, the storage device and the first universal serial bus transmission interface; a cable, including a first end and a second end, wherein, the cable One end is coupled to the first universal serial bus transmission interface, wherein the length of the cable is at least greater than two meters; and a pair of lens equipment, including: a pair of lens cameras for image recording; a second universal The serial bus transmission interface includes a positive data terminal and a negative data terminal, wherein the second universal serial bus transmission interface is coupled to the second end of the cable; and an equalizer circuit includes a positive input terminal , A negative input terminal, a positive output terminal and a negative output terminal, wherein the positive input terminal of the equalizer circuit is coupled to the positive data terminal of the second universal serial bus port, the The negative input terminal of the converter circuit is coupled to the negative data terminal of the second universal serial bus port, wherein the converter circuits are used to transfer the positive data terminal and the negative data terminal of the second universal serial bus transmission interface The high frequency band of the input data is amplified; a second control circuit is coupled to the sub-lens camera, the second universal serial bus transmission interface and the equalizer circuit; a de-emphasis circuit is coupled to the second control A circuit and the second universal serial bus transmission interface to de-emphasize the data to be transmitted from the second control circuit to the second universal serial bus transmission interface to reduce the low frequency response; and wherein, when the sub lens device When transmitting the image data captured by the sub-lens camera to the host device, the de-emphasis circuit de-emphasizes the image data to reduce the low-frequency response, so that the host device can correctly receive the image data. When the sub-lens device passes through the The second universal serial bus transmission interface receives the data, and the equalizer circuit amplifies the high frequency band of the data received by the positive input terminal and the negative input terminal of the second universal serial bus transmission interface to enable the second control The circuit obtains correct data, wherein the de-emphasis circuit includes: a delay circuit including an input terminal and an output terminal, wherein the input terminal of the delay circuit receives a sequence of data from the first control circuit and delays a preset Output after time; a first gain circuit, including an input terminal, a gain adjustment terminal and an output terminal, wherein the input terminal of the first gain circuit is coupled to the delay circuit The output terminal of the first gain circuit is coupled to the first control circuit, wherein the first gain circuit is used to multiply the received data by a gain and output to the first gain circuit An output terminal; and an addition circuit including a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal of the addition circuit receives the serial data from the first control circuit, and the addition circuit The second input terminal is coupled to the output terminal of the first gain circuit, wherein the addition circuit is used to subtract the signal of the first input terminal and the signal of the second input terminal for de-emphasis.

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