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Signal detection method of minimum transmission differential signal transmission system and device thereof

A signal detection and differential signal technology, applied in the field of detection signals, can solve the problems of reduced detection current and inability to actively control the amount of current.

Active Publication Date: 2010-09-08
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology

However, since the load of the receiver RX is composed of two passive resistors 202, 204, it cannot actively control the amount of passing current, so the current resource of the receiver RX is still controlled by the transmitter TX, so that the detection current I RX cannot effectively reduce

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  • Signal detection method of minimum transmission differential signal transmission system and device thereof
  • Signal detection method of minimum transmission differential signal transmission system and device thereof
  • Signal detection method of minimum transmission differential signal transmission system and device thereof

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Embodiment Construction

[0046] Please refer to Figure 3A , Figure 3A It is a schematic diagram of a signal detection device 30 according to an embodiment of the present invention. The signal detection device 30 is used for figure 1 The shown receiver RX of the TMMDS transmission system 10 is used to detect the signal transmission status of any channel TMDS_CHx. The signal detection device 30 includes a first current source 302 , a second current source 304 and a judgment module 300 . Compare figure 2 It can be seen that the signal detection device 30 adds a first current source 302 and a second current source 304, and adds a first switch 312 and a second switch 314, which are used as a load disconnecting device to disconnect the load resistors 202, 204 . The first current source 302 is used to provide a first reference current IREF1 in the first differential line L1, and the second current source 304 is used to provide a second reference current IREF2 in the second differential line L2. In a...

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Abstract

The invention provides a signal detection method of a minimum transmission differential signal transmission system and a device thereof, which are used for the minimum transmission differential signal transmission system. A passage of the system is arranged between a receiver and a transmitter. The signal detection method comprises the following steps: disconnecting the electric connection between a load in the receiver and the passage; providing a first reference current in a first differential circuit of the passage; providing a second reference current in a second differential circuit of the passage; calculating a difference value between the first reference current and the current derived by the transmitter through the first differential circuit to obtain a first current difference value; calculating a difference value between the second reference current and the current derived by the transmitter through the second differential circuit to obtain a second current difference value; performing low-pass filtering operation to a first node voltage and a second node voltage so as to generate a low-pass operation result; and judging the operation state of the transmitter according to the low-pass operation result; wherein the first node voltage corresponds to the first current difference value and the second node voltage corresponds to the second current difference value.

Description

technical field [0001] The present invention relates to a signal detection method used in a receiver of a minimum transmission differential signal transmission system and a related device thereof, in particular to a method for correctly judging a transmitter in a receiver of a minimum transmission differential signal transmission system The detection signal method and the related device of the operation situation. Background technique [0002] With the development of multimedia technology, people's demand for digital audio-visual products is increasing day by day, such as next-generation game consoles, digital TVs, DVD players, etc. In order to transmit digital audio-visual data, known technologies have developed a high definition multimedia interface (High Definition Multimedia Interface, HDMI). The high-resolution multimedia interface is developed from the Digital Visual Interface (DVI), which adopts the encoding method of Transition Minimized Differential Signal (TMDS) t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02G09G5/00H04L25/03
Inventor 萧乔蔚陈国基罗蒔樵
Owner NOVATEK MICROELECTRONICS CORP
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