TWI556650B - Bidirectional transmission apparatus - Google Patents

Description

Two-way transmission device

The present invention relates to bidirectional transmission of signals, and more particularly to a bidirectional transmission apparatus capable of realizing bidirectional transmission of a half duplex control signal without using a costly dedicated IC.

In general, the traditional HDMI signal extender (Extender) mostly uses a dedicated IC to solve the problem that the two-way control signal cannot be compensated. The disadvantage is that the cost of the dedicated IC is too high, and the signal compensation is fixed and less flexible.

In addition, the conventional HDMI signal extender can also use the Timing control method to control the transmission and output of the two-way signal through the enable control pin. However, since the timing control is difficult and the implementation is not easy, once the timing control is wrong, the signal feedback is likely to cause a problem of data latching.

Accordingly, the present invention proposes a two-way transmission device to solve the above problems encountered in the prior art.

A specific embodiment of the invention is a two-way transmission device. In this embodiment, the bidirectional transmission device includes a first operator and a second operator. The first operator has a first input and a first output. The second operator has a third input, a fourth input, and a second output. The third input end of the second computing unit is coupled to the first input end of the first computing unit. The fourth input end of the second computing unit is coupled to the first output end of the first computing unit. The fourth input end of the second computing unit receives the first input signal, and the second output end outputs the first output signal.

In an embodiment, when the first input signal is input to the second operator, the first input signal cannot be simultaneously input to the first operator.

In an embodiment, the first operator also has a second input. Second input The end is coupled to the ground.

In an embodiment, the third input end and the fourth input end of the second computing unit are respectively a positive input end and a negative input end, and the first input signal received by the fourth input end has a positive voltage, The first output signal outputted by the two outputs has a negative voltage.

In an embodiment, the two-way transmission device further comprises a conversion unit. The conversion unit is coupled to the second output end of the second operator for converting the first output signal having a negative voltage back to the first input signal having a positive voltage and outputting.

In one embodiment, the first input signal is a half duplex control signal.

In one embodiment, the half-duplex control signal is an Inter-Integrated Circuit (I ² C) control signal, a Universal Serial Bus (USB) 1.1 control signal, or a Universal Sequence Bus 2.0 control. Signal.

In one embodiment, the two-way transmission device is used in a signal extender. The signal extender includes a transmission module, a pair of transmission lines, and a receiving module. The pair of transmission lines are coupled between the transmission module and the receiving module. The transmission module and the receiving module are respectively provided with a bidirectional transmission device, and the conversion unit of the bidirectional transmission device of the transmission module outputs the first input signal to one of the transmission lines of the pair of transmission lines, and the bidirectional transmission device of the receiving module is The transmission line receives the first input signal.

In an embodiment, in the bidirectional transmission device of the receiving module, the first input end of the first computing unit receives the first input signal from the transmission line, and outputs the first input signal from the first output end, and is similar to the second The third input end of the computing device receives the first input signal from the transmission line, and the fourth input end receives the first input signal from the first output end of the first computing unit, wherein the third input end of the second computing unit The four input terminals are a positive input terminal and a negative input terminal, so that the second output terminal of the second operator does not output any signal.

In one embodiment, the pair of transmission cables are one pair of twisted pairs of CAT5 cables.

In one embodiment, the transmitting module receives the first input signal from a source device (eg, an image input device), and transmits the first input signal to the receiving module through one of the pair of transmission lines. The receiving module outputs the first input signal to a signal output device (for example, an image output device). The receiving module can also receive a second input signal from the signal output device, and transmit the second input signal to the transmission module through another transmission line of the pair of transmission lines. Go to the source device.

In one embodiment, the transmitting module receives the first input signal from a USB host device and transmits the first input signal to the receiving module through one of the pair of transmission lines for the receiving module to An input signal is output to a USB controlled device. The receiving module can also receive a second input signal from the USB controlled device, and transmit the second input signal to the transmitting module through another transmission line of the pair of transmission lines, and output the signal to the USB host device.

In one embodiment, the two-way transmission device is used in a signal booster. The signal booster includes a transmitting module and a receiving module. The transmission module and the receiving module are respectively provided with a bidirectional transmission device, and the conversion unit of the bidirectional transmission device of the transmission module is coupled to the first input end of the first computing device of the bidirectional transmission device of the receiving module, and the two-way receiving module The conversion unit of the transmission device is coupled to the first input end of the first operator of the bidirectional transmission device of the transmission module.

In an embodiment, in the bidirectional transmission device of the receiving module, the first input end of the first computing unit receives the first input signal from one of the transmission lines of the pair of transmission lines and outputs the first input signal by the first output end, The third input end of the second computing unit receives the first input signal from the transmission line, and the fourth input end receives the first input signal from the first output end of the first computing unit, wherein the third input end of the second computing unit And the fourth input end is a positive input terminal and a negative input terminal respectively, so the second output end of the second computing device does not output any signal.

In one embodiment, the transmitting module receives the first input signal from a signal source device, and the receiving module outputs the first input signal to a signal output device, and the receiving module can receive the first signal from the signal output device. The second input signal is transmitted to the transmission module and output to the signal source device.

In an embodiment, the bidirectional transmission device further includes a plurality of signal compensation units coupled to the first output end of the first computing unit, and coupled to the first input end of the first computing unit and the second computing unit. Between the three inputs, for signal compensation.

Compared to the prior art, the two-way transmission device according to the present invention has the following advantages:

(1) The two-way transmission device of the present invention realizes bidirectional transmission of a half-duplex control signal in a low-cost architecture, and the two-way signal does not interfere with each other when it is transmitted in turn, thereby improving the cost caused by the prior art using a dedicated IC. High problem.

(2) The two-way transmission device of the present invention can be applied to a signal transmission system having a signal extender or a signal booster, and can provide a higher flexibility compensation mechanism by adding a signal compensation unit.

(3) Since the bidirectional transmission device of the present invention does not need to be operated by Timing control, the problem of data latching caused by signal feedback when the timing control is wrong in the prior art can be solved.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

1, 2‧‧‧Signal transmission system

EXT‧‧‧ signal extender

BST‧‧‧ Signal Enhancer

TX‧‧‧Transmission Module

RX‧‧‧ receiving module

10A, 10B, 20A, 20B‧‧‧ two-way transmission device

11, 21‧‧‧ Signal source device

12, 22‧‧‧ signal output device

S1‧‧‧ first input signal

S1’‧‧‧ first output signal

S2‧‧‧ second input signal

S2’‧‧‧second output signal

100, 104‧‧‧First Operator

102, 106‧‧‧Secondary

103, 107‧‧‧ conversion unit

L1~L2‧‧‧A pair of transmission lines

+‧‧‧正Input

-‧‧‧negative input

101‧‧‧Signal compensation unit

K1~K4‧‧‧ output

1 is a schematic diagram of a two-way transmission device applied to a signal extender in accordance with an embodiment of the present invention.

2A is a schematic diagram showing the signal source device transmitting a first input signal to a signal output device through a bidirectional transmission device in the signal extender.

2B is a schematic diagram showing the signal output device transmitting the second input signal to the signal source device through the bidirectional transmission device in the signal extender.

2C is a schematic diagram showing a signal compensation unit further disposed in the bidirectional transmission device.

3 is a schematic diagram of a two-way transmission device applied to a signal booster according to another embodiment of the present invention.

A preferred embodiment of the invention is a two-way transmission device. In this embodiment, the bidirectional transmission device can be applied to a signal extender, and the signal extender can be applied to a signal transmission system, but is not limited thereto. Please refer to FIG. 1. FIG. 1 is a schematic diagram showing the application of the bidirectional transmission device in this embodiment to a signal extender.

As shown in FIG. 1 , in the signal transmission system 1 , the signal extender EXT is coupled between the signal source device 11 and the signal output device 12 . The signal extender EXT includes a transmission module TX, a pair of transmission lines L1 to L2, and a receiving module RX. The pair of transmission lines L1~L2 are coupled Between the transmission module TX and the receiving module RX. Two-way transmission devices 10A and 10B are provided in the transmission module TX and the reception module RX, respectively. In this embodiment, the pair of transmission lines L1 L L2 are any pair of twisted pairs of four pairs of twisted pairs included in the CAT5 cable, but are not limited thereto.

In practical applications, the signal source device 11 can be any device capable of providing a half-duplex control signal, such as an image source device capable of providing an Inter-Integrated Circuit (I ² C) control signal (such as an HDMI video player). ), or a USB host device capable of providing a Universal Serial Bus (USB) 1.1 control signal or a Universal Serial Bus 2.0 control signal; the signal output device 12 can be any device capable of receiving a half-duplex control signal For example, an image output device (such as a screen) capable of receiving an internal integrated circuit (I ² C) control signal, or a USB controlled device capable of receiving a general sequence bus 1.1 control signal or a universal serial bus 2.0 control signal, but both Not limited to this.

2A and FIG. 2B, FIG. 2A is a schematic diagram showing the first input signal of the signal source device transmitted to the signal output device through the bidirectional transmission device of the signal extender; FIG. 2B is the second signal output device. A schematic diagram of the input signal transmitted to the signal source device through the bidirectional transmission device of the signal extender.

As shown in FIG. 2A, the signal source device 11 provides a first input signal S1 to a transmission module TX. The bidirectional transmission device 10A in the transmission module TX outputs the first input signal S1 to one of the transmission lines L1 of the pair of transmission lines. The bidirectional transmission device 10B in the module RX is received, and the first input signal S1 is output to the signal output device 12 by the bidirectional transmission device 10B.

As shown in FIG. 2B, the signal output device 12 provides the second input signal S2 to the receiving module RX. The two-way transmitting device 10B in the receiving module RX outputs the second input signal S2 through the other transmission line L2 of the pair of transmission lines. The bidirectional transmission device 10A in the transmission module TX, and the second input signal S2 is output from the bidirectional transmission device 10A to the signal source device 11.

It should be noted that since the first input signal S1 is transmitted from the signal source device 11 through the signal extender EXT to the signal output device 12, the second input signal S2 is transmitted from the signal output device 12 through the signal extender EXT to the signal source. The transmission direction of the device 11, that is, the first input signal S1 is opposite to the transmission direction of the second input signal S2.

In this embodiment, the first input signal S1 and the second input signal S2 both have a positive voltage, and the first input signal S1 and the second input signal S2 are both half-duplex control signals, such as an internal integrated circuit (I ² C). Control signal, universal serial bus (USB) 1.1 control signal or universal serial bus 2.0 control signal, but not limited to this.

Next, how the signal extender EXT performs bidirectional transmission of the half duplex control signal through the bidirectional transmission devices 10A and 10B will be described in detail with reference to FIGS. 2A and 2B, respectively.

As shown in FIG. 2A and FIG. 2B, the bidirectional transmission device 10A in the transmission module TX includes a first operator 100, a second operator 102, and a conversion unit 103. The first computing unit 100 has a positive input terminal +, a negative input terminal - and an output terminal K1; the second operator 102 has a positive input terminal +, a negative input terminal - and an output terminal K2. The output terminal K1 of the first computing unit 100 and the negative input terminal of the second computing device 102 are both coupled to the signal source device 11; the negative input terminal of the first computing device 100 is coupled to the ground terminal; the first computing device 100 The positive input terminal + is coupled to the transmission line L2; the positive input terminal + of the second operator 102 is coupled to the positive input terminal + of the first computing device 100; the output terminal K2 of the second computing device 102 is coupled to the conversion unit 103 The conversion unit 103 is coupled to the transmission line L1.

The bidirectional transmission device 10B in the receiving module RX also includes a first operator 104, a second operator 106, and a conversion unit 107. The first operator 104 has a positive input terminal +, a negative input terminal - and an output terminal K3; the second operator 106 has a positive input terminal +, a negative input terminal - and an output terminal K4. The output terminal K3 of the first computing unit 104 and the negative input terminal of the second computing unit 106 are both coupled to the signal output device 12; the negative input terminal of the first computing device 104 is coupled to the ground terminal; the first computing device 104 The positive input terminal + is coupled to the transmission line L1; the positive input terminal + of the second operator 106 is coupled to the positive input terminal + of the first operator 104; the output terminal K4 of the second operator 106 is coupled to the conversion unit 107 The conversion unit 107 is coupled to the transmission line L2.

When the signal source device 11 provides the first input signal S1 having a positive voltage to the transmission module TX, as shown in FIG. 2A, the first input signal S1 is respectively transmitted to the second operator 102 of the bidirectional transmission device 10A. The negative input terminal - and the output terminal K1 of the first operator 100.

It should be noted that since the first input signal S1 having a positive voltage is transmitted to the output terminal K1 of the first computing unit 100 instead of the positive input terminal + or the negative input terminal of the first computing device 100, the first The arithmetic unit 100 does not receive the first input signal S1 having a positive voltage. That is, when the first input signal S1 is input to the second computing unit 102, the first input signal The number S1 cannot be simultaneously input to the first operator 100. At this time, the positive input terminal + of the first computing unit 100 does not receive any input signal from the transmission line L2, and its negative input terminal - coupled to the ground terminal, does not receive any input signal.

As for the second computing unit 102, since the negative input terminal of the second computing unit 102 receives the first input signal S1 having a positive voltage, and its positive input terminal + does not receive any input signal, the second operation The output terminal K2 of the device 102 outputs a first output signal S1' having a negative voltage to the conversion unit 103. The first output signal S1' has the same voltage as the first input signal S1, and the difference between the two is only the difference between the positive and negative voltages. When the converting unit 103 receives the first output signal S1' having a negative voltage, the converting unit 103 converts the first output signal S1' having a negative voltage back to the first input signal S1 having a positive voltage, and will have a positive voltage. The first input signal S1 is output to the transmission line L1 for transmission to the receiving module RX.

In practical applications, the conversion unit 103 can be any component that has a negative voltage converted back to a positive voltage, such as a P-type MOSFET, but is not limited thereto.

When the first input signal S1 having a positive voltage is transmitted to the receiving module RX through the transmission line L1, the first input signal S1 is respectively transmitted to the first operator 104 of the bidirectional transmission device 10B in the receiving module RX. Input + and positive input + of second operator 106.

For the first computing unit 104, since the positive input terminal + of the first computing unit 104 receives the first input signal S1 having a positive voltage and the negative input terminal of the first computing device 104 is coupled to the ground, the first The output terminal K3 of the arithmetic unit 104 outputs a first input signal S1 having a positive voltage and is respectively transmitted to the negative input terminal of the signal output device 12 and the second operator 106.

It should be noted that when the signal output device 12 receives the first input signal S1 having a positive voltage from the output terminal K3 of the first computing unit 104, it represents the first input signal with a positive voltage output by the signal source device 11. S1 has been successfully transmitted to the signal output device 12 through the bidirectional transmission device 10A in the transmission module TX, the transmission line L1, and the bidirectional transmission device 10B in the receiving module RX.

In addition, as for the second computing unit 106, since the positive input terminal + and the negative input terminal of the second computing unit 106 are received, the first input signal S1 having a positive voltage is received. The second operator 106 subtracts the two and cancels each other. Therefore, the output K4 of the second operator 106 does not output any signal to the conversion unit 107. At this time, the conversion unit 107 does not output any signal to the transmission line L2, so the transmission line L2 does not transmit any signal to the bidirectional transmission device 10A in the transmission module TX, thereby effectively avoiding the signal feedback mechanism in the prior art. The resulting data latch-up phenomenon occurred.

When the signal output device 12 provides the second input signal S2 having a positive voltage to the receiving module RX, as shown in FIG. 2B, the second input signal S2 is respectively transmitted to the second operator 106 of the bidirectional transmission device 10B. The negative input - and the output K3 of the first operator 104.

It should be noted that since the second input signal S2 having a positive voltage is transmitted to the output terminal K3 of the first operator 104 instead of the positive input terminal + or the negative input terminal of the first operator 104, the first The arithmetic unit 104 does not receive the second input signal S2 having a positive voltage. That is, when the second input signal S2 is input to the second computing unit 106, the second input signal S2 cannot be simultaneously input to the first computing unit 104. At this time, the positive input terminal + of the first computing unit 104 does not receive any input signal from the transmission line L1, and its negative input terminal - coupled to the ground terminal, does not receive any input signal.

As for the second operator 106, since the negative input terminal of the second computing unit 106 receives the second input signal S2 having a positive voltage, and its positive input terminal + does not receive any input signal from the transmission line L1, therefore, The output terminal K4 of the second operator 106 outputs a second output signal S2' having a negative voltage to the conversion unit 107. The voltage of the second output signal S2' and the second input signal S2 are the same, and the difference between the two is only the difference between the positive and negative voltages. When the converting unit 107 receives the second output signal S2' having a negative voltage, the converting unit 107 converts the second output signal S2' having a negative voltage back to the second input signal S2 having a positive voltage, and will have a positive voltage. The second input signal S2 is output to the transmission line L2 for transmission to the transmission module TX.

In practical applications, the conversion unit 107 can be any component that has a negative voltage converted back to a positive voltage, such as a P-type MOSFET, but is not limited thereto.

When the second input signal S2 having a positive voltage is transmitted to the transmission module TX through the transmission line L2, the second input signal S2 is respectively transmitted to the two-way in the transmission module TX. The positive input terminal + of the first operator 100 of the transmission device 10A and the positive input terminal + of the second operator 102.

For the first computing unit 100, since the positive input terminal + of the first computing device 100 receives the second input signal S2 having a positive voltage and the negative input terminal of the first computing device 100 is coupled to the ground, the first The output terminal K1 of the computing unit 100 outputs a second input signal S2 having a positive voltage and is respectively transmitted to the negative input terminal of the signal source device 11 and the second operator 102.

It should be noted that when the signal source device 11 receives the second input signal S2 with a positive voltage from the output terminal K1 of the first computing device 100, it represents the second input signal with a positive voltage output by the signal output device 12. S2 has been successfully transmitted to the signal source device 11 through the bidirectional transmission device 10B in the receiving module RX, the transmission line L2, and the bidirectional transmission device 10A in the transmission module TX.

In addition, in terms of the second computing unit 102, since the positive input terminal + and the negative input terminal of the second computing device 102 are both received a second input signal S2 having a positive voltage, the second computing device 102 will After the subtraction, the offsets are offset from each other. Therefore, the output terminal K2 of the second computing unit 102 does not output any signal to the conversion unit 103. At this time, the conversion unit 103 does not output any signal to the transmission line L1, so the transmission line L1 does not transmit any signal to the bidirectional transmission device 10B in the receiving module RX, thereby effectively avoiding the signal feedback mechanism in the prior art. The resulting data latch-up phenomenon occurred.

2A, FIG. 2B and the above embodiment, the bidirectional transmission device 10A disposed in the transmission module TX of the signal extender EXT, the bidirectional transmission device 10B disposed in the receiving module RX of the signal extender EXT, and a For the transmission lines L1 L L2, the first input signal S1 having a positive voltage outputted by the signal source device 11 can be smoothly transmitted to the signal output device 12, and the second input signal S2 having a positive voltage outputted by the signal output device 12 can also be Smooth transmission to the signal source device 11 for bidirectional transmission of the half duplex control signal.

In addition, the first input signal S1 outputted by the signal source device 11 is transmitted to the receiving module RX after being transmitted over the long distance of the bidirectional transmission device 10A and the transmission line L1 in the transmission module TX, and the signal output device 12 The output second input signal S2 is also transmitted to the transmission module TX after being transmitted over the long distance of the two-way transmission device 10B and the transmission line L2 in the receiving module RX, resulting in the first input signal S1 and the second input signal S2. Signal The strength may be attenuated. Therefore, the bidirectional transmission device 10A in the transmission module TX and the bidirectional transmission device 10B in the receiving module RX may further be provided with a signal compensation unit for the first input signal S1 and the second input. Signal S2 performs signal compensation.

For example, as shown in FIG. 2C, the signal compensation unit 101 in the bidirectional transmission device 10A can be coupled between the positive input terminal of the first computing device 100 and the positive input terminal + of the second computing device 102, and coupled. The output terminal K1 of the first computing device 100 is configured to perform signal compensation on the second input signal S2. The signal compensation unit 101 in the bidirectional transmission device 10B can be coupled to the positive input terminal + and the second of the first computing device 104. The positive input terminal + of the computing unit 106 is coupled to the output terminal K3 of the first computing unit 104 for signal compensation of the first input signal S1.

In a practical application, the signal compensation unit 101 may include a circuit composed of a resistor element and a capacitor element, but is not limited thereto.

In summary, the bidirectional transmission devices 10A and 10B applied to the signal extender EXT according to the present invention can realize bidirectional transmission of the half duplex control signal in a low cost architecture, and does not need to be controlled by Timing. In this way, the two-way signals can be transmitted without any conflict and interference, and the data latching phenomenon caused by the signal feedback when the timing control is incorrect can be avoided.

Another preferred embodiment of the present invention is also a two-way transmission device. In this embodiment, the two-way transmission device can be applied to a signal booster, but is not limited thereto. Please refer to FIG. 3. FIG. 3 is a schematic diagram showing the application of the bidirectional transmission device in this embodiment to a signal booster.

As shown in FIG. 3, in the signal transmission system 2, the signal booster BST is coupled between the signal source device 21 and the signal output device 22. The signal booster BST includes a transmission module TX and a receiving module RX coupled to each other. Two-way transmission devices 20A and 20B are provided in the transmission module TX and the reception module RX, respectively. The two-way transmission devices 20A and 20B are coupled to each other.

It should be noted that, unlike the transmission module TX of the signal extender EXT in the previous embodiment, the distance between the transmission module TX and the receiving module RX is relatively long, and the signal transmission is performed through the CAT5 cable. The transmission module in this embodiment The TX and the receiving module RX are disposed adjacent to each other in the signal booster BST, so that only the common line coupling is required.

In practical applications, the signal source device 21 can be any device capable of providing a half-duplex control signal, such as an image source device capable of providing internal integrated circuit (I ² C) control signals or capable of providing a universal serial bus (USB). 1.1 Control signal or universal serial bus 2.0 control signal USB master device; signal output device 22 can be any device capable of receiving half-duplex control signals, such as image output capable of receiving internal integrated circuit (I ² C) control signals The device is either a USB controlled device capable of receiving a general sequence bus 1.1 control signal or a universal sequence bus 2.0 control signal, but is not limited thereto.

In this embodiment, the bidirectional transmission device 20A disposed in the transmission module TX of the signal booster BST and the bidirectional transmission device 20B disposed in the receiving module RX of the signal booster BST are output by the signal source device 21. The input signal can be smoothly transmitted to the signal output device 22, and the other input signal outputted by the signal output device 22 can be smoothly transmitted to the signal source device 21, thereby realizing the bidirectional transmission of the half duplex control signal.

For the circuit configuration diagrams of the bidirectional transmission devices 20A and 20B disposed in the transmission module TX and the reception module RX, since the circuit configurations and actual operation conditions of the bidirectional transmission devices 20A and 20B are similar to those of the bidirectional transmission devices 10A and 10B, Please also refer to the two-way transmission devices 10A and 10B shown in FIG. 2A and FIG. 2B and related descriptions, and details are not described herein. Similarly, the signal compensation unit may be disposed in the signal booster BST. Please refer to FIG. 2C and related descriptions, and details are not described herein.

Compared to the prior art, the two-way transmission device according to the present invention has the following advantages:

(1) The two-way transmission device of the present invention realizes bidirectional transmission of a half-duplex control signal in a low-cost architecture, and the two-way signal does not interfere with each other when it is transmitted in turn, thereby improving the cost caused by the prior art using a dedicated IC. High problem.

(2) The two-way transmission device of the present invention can be applied to a signal transmission system having a signal extender or a signal booster, and can provide a high elasticity compensation mechanism through the addition of a signal compensation unit.

(3) Since the bidirectional transmission device of the present invention does not need to be operated by the timing control, the problem of data latching caused by signal feedback when the timing control is wrong in the prior art can be solved.

With the detailed description of the above preferred embodiments, it is hoped that the description will be more clearly described. The scope and spirit of the present invention is not limited by the preferred embodiments disclosed herein. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

EXT‧‧‧ signal extender

TX‧‧‧Transmission Module

RX‧‧‧ receiving module

10A, 10B‧‧‧ two-way transmission device

11‧‧‧Signal source device

12‧‧‧Signal output device

S1‧‧‧ first input signal

S1’‧‧‧ first output signal

100, 104‧‧‧First Operator

102, 106‧‧‧Secondary

103, 107‧‧‧ conversion unit

L1~L2‧‧‧A pair of transmission lines

+‧‧‧正Input

-‧‧‧negative input

K1~K4‧‧‧ output

Claims (17)

A two-way transmission device includes: a first computing unit having a first input end and a first output end; and a second computing unit having a third input end, a fourth input end, and a second output The third input end is directly coupled to the first input end of the first computing unit, and the third input end receives the same signal as the first input end, and the fourth input end is coupled to the first computing unit. The first output terminal receives a first input signal and outputs a first output signal from the second output terminal. The two-way transmission device of claim 1, wherein the first input signal cannot be simultaneously input to the first operator when the first input signal is input to the second operator. The two-way transmission device of claim 1, wherein the first operator further has a second input coupled to the ground. The bidirectional transmission device of claim 1, wherein the first input signal received by the fourth input end of the second computing unit has a positive voltage, and the second output end outputs the first An output signal has a negative voltage. The bidirectional transmission device of claim 4, further comprising: a conversion unit coupled to the second output end of the second operator for converting the first output signal having a negative voltage back to have The first input signal of the positive voltage is output. The two-way transmission device of claim 1, wherein the first input signal is a half duplex control signal. The bidirectional transmission device of claim 6, wherein the half duplex control signal is an Inter-Integrated Circuit (I ² C) control signal and a Universal Serial Bus (Universal Serial Bus, USB) 1.1 control signal or a universal serial bus 2.0 control signal. The two-way transmission device according to claim 5 is applied to a signal extender, the signal extender includes a transmission module, a pair of transmission lines and a receiving module, and the pair of transmission lines are coupled. Between the transmitting module and the receiving module, the two-way transmitting device is disposed in the transmitting module and the receiving module, and the converting unit of the two-way transmitting device of the transmitting module is the first The input signal is output to one of the pair of transmission lines, and the bidirectional transmission device of the receiving module receives the first input signal from the transmission line. The bidirectional transmission device of claim 8, wherein the first input end of the first computing unit receives the first input signal from the transmission line, and the bidirectional transmission device of the receiving module The first output terminal outputs the first input signal, and the third input end of the second computing unit receives the first input signal from the transmission line, and the fourth input end is the first output from the first computing unit Receiving the first input signal, wherein the third input end and the fourth input end of the second computing unit are respectively a positive input end and a negative input end, and the second output end of the second computing unit is not Any signal will be output. The two-way transmission device of claim 8, wherein the pair of transmission cables is one of a pair of CAT5 cables. The two-way transmission device of claim 8, wherein the transmission module receives the first input signal from a source device and transmits the first input signal to the reception through one of the pair of transmission lines a module, wherein the receiving module outputs the first input signal to a signal output device, and the receiving module can receive a second input signal from the signal output device and transmit the other transmission line through the pair of transmission lines The second input signal is transmitted to the transmission module and output to the signal source device. The two-way transmission device of claim 8, wherein the transmission module is The USB host device receives the first input signal, and transmits the first input signal to the receiving module through one of the pair of transmission lines, and the receiving module outputs the first input signal to a USB controlled device. The receiving module can also receive a second input signal from the USB controlled device and transmit the second input signal to the transmitting module through another transmission line of the pair of transmission lines, and output the signal to the USB host device. The two-way transmission device of claim 1, wherein the third input end and the fourth input end of the second computing unit are a positive input terminal and a negative input terminal, respectively. The two-way transmission device of claim 5 is applied to a signal booster comprising a transmission module and a receiving module, the transmitting module and the receiving module The two-way transmission device is disposed in the second embodiment, the conversion unit of the two-way transmission device of the transmission module is coupled to the first input end of the first computing device of the two-way transmission device of the receiving module, and the receiving module The conversion unit of the bidirectional transmission device is coupled to the first input end of the first operator of the bidirectional transmission device of the transmission module. The two-way transmission device of claim 14, wherein in the two-way transmission device of the receiving module, the first input end of the first computing unit receives the first input signal from the transmitting module, and The first input signal is outputted by the first output end, and the third input end of the second computing unit receives the first input signal from the transmitting module, and the fourth input end is from the first computing unit The first output end receives the first input signal, wherein the third input end and the fourth input end of the second computing unit are a positive input end and a negative input end respectively, and the second operation unit is second The output does not output any signals. The two-way transmission device of claim 14, wherein the transmission module receives the first input signal from a signal source device, and the receiving module outputs the first input signal to a signal output device The receiving module can also be powered by the signal output device Receiving a second input signal, and transmitting the second input signal to the transmission module, and outputting to the signal source device. The two-way transmission device of claim 1, further comprising: a plurality of signal compensation units respectively coupled to the first output end of the first operator and coupled to the first operator An input is coupled between the third input of the second operator.