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Bidirectional-transmission low-speed signal amplitude detection method

A technology of signal amplitude detection and two-way transmission, which is used in instruments, electrical digital data processing, etc.

Active Publication Date: 2017-01-04
CHENGDU CORPRO TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Based on the importance of the cable connection, increase the detection amplitude of the low-speed signal to judge whether the connection is established, and the usual detection circuit can only detect the one-way signal without superimposition, so it is necessary to use a detection circuit capable of bidirectional signal, such as figure 1 shown

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  • Bidirectional-transmission low-speed signal amplitude detection method
  • Bidirectional-transmission low-speed signal amplitude detection method
  • Bidirectional-transmission low-speed signal amplitude detection method

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Embodiment Construction

[0021] Further describe the technical scheme of the present invention in detail below in conjunction with accompanying drawing:

[0022] Such as figure 2 Shown, a kind of low-speed signal amplitude detection method of two-way transmission, it comprises the following steps:

[0023] S1: Receive the input differential signal through the potential shift circuit, and convert the DC operating point of the differential signal to the DC operating point of the first low-pass comparator to maintain a small attenuation of the differential signal;

[0024] S2: Attenuate the high-speed component of the bidirectionally transmitted differential signal through the first low-pass comparator, and retain the component of the low-speed signal: the input terminal of the first low-pass comparator is connected to the potential shift circuit; at the same time, by comparing with the first low-pass The second low-pass comparator with the same structure as the second low-pass comparator maintains a p...

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Abstract

The invention discloses a bidirectional-transmission low-speed signal amplitude detection method. The method includes moving a DC (direct current) working point of bidirectional-communication signals to a DC working point of a low-pass comparator through a potential translation circuit, then attenuating amplitude of high-speed signals through the low-pass comparator, keeping the amplitude of low-speed signals, comparing square of the amplitude of low-speed signals with fixed difference square with an amplitude square comparator, judging that low-speed signals are present if the square of the amplitude of low-speed signals is higher than the set fixed difference value, and judging that low-speed signals are not present if the square of the amplitude of low-speed signals is lower than the set fixed difference square, so as to finish detection.

Description

technical field [0001] The invention relates to a two-way transmission low-speed signal amplitude detection method. Background technique [0002] In video transmission applications, video acquisition signals and signal processing chips are transmitted serially, which requires not only the transmission of RGB, VSNYC, and HSYNC signals between acquisition and signal processing, but also the transmission of low-speed control signals between them. If an additional transmission line is added, it will increase the weight of the product. In order to save cables, a low-speed signal generator is added at the high-speed receiver, and a low-speed signal receiver is added at the high-speed transmitter. The high-speed and low-speed signals are superimposed on the same cable to complete the two-way communication function. Two-way communication requires the existence of both signals. When the cable is not connected, the communication between the two will not be established. Based on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40G06F13/42
CPCG06F13/4068G06F13/4282
Inventor 黄善飞戴广豪
Owner CHENGDU CORPRO TECH CO LTD
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