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Infrared receiving circuit

An infrared receiving and circuit technology, used in electromagnetic receivers, short-range systems, free space transmission, etc., can solve the problems of reducing the receiving distance of products, complicated selection, etc., to achieve simplification, suppression of different noises, and convenient use. Effect

Active Publication Date: 2014-09-24
CRM ICBG (WUXI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Therefore, corresponding to different applications, customers on the application side need to purchase different infrared receiving circuits to correspond to their own products. Once the wrong choice is made, the receiving distance of the product will be greatly reduced, resulting in a wide variety of infrared receiving circuits and complicated selection.

Method used

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0028] image 3 The functional block diagram of the infrared receiving circuit provided by the present invention.

[0029] Such as image 3 As shown, the infrared receiving circuit provided by the present invention includes: a front receiving unit and a signal processing unit. Among them, the pre-receiving unit includes a photoelectric conversion module, an I / V conversion module, and a pre-amplification module; the signal processing unit includes a controllable gain amplification module, a band-pass filter module, a wave detection and shaping module, a noise judgment module, and a detection control module. The infrared light signal is input to the photoelectric conversion module, and the optical signal is converted into a current signal output; the current signa...

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Abstract

The invention discloses an infrared receiving circuit, which comprises a pre-receiving unit and a signal processing unit. The signal processing unit comprises a controllable gain amplifying module, a band-pass filter module, a detecting and reshaping module, a detection control module and a noise judging module. By the detection control module, coding format information of input signals is extracted and is compare to the preset coding format information, and noise judging control signals are generated according to the comparison results and then output to the noise judging module. The noise judging module generates noise control signals according to the built-in noise control scheme, the noise control signals are output to the controllable gain amplifying module, so that gain magnitude of the controllable gain amplifying module is controlled. The infrared receiving circuit is capable of automatically detecting infrared command coding format transmitted in a remote control manner and being adjusted to be adaptable to different remote control coding formats, and accordingly the anti-interference performance of the circuit is improved.

Description

technical field [0001] The invention relates to an infrared receiving circuit, in particular to an infrared receiving circuit capable of adapting to different coding formats. Background technique [0002] At present, low-frequency infrared receiving circuits are used in various fields, such as home appliances, toys and so on. [0003] There are various remote control coding formats in the world. Different encoding formats have different command interval times, and different pulse times to represent "1" and "0". For example, the interval time between two commands in the current mainstream NEC remote control coding format is 22ms, the command interval time in Sony 20bit format is 6.6ms, and the command interval time in RC5 format is as much as 89ms. The following table describes the current mainstream infrared remote control encoding formats. [0004] [0005] [0006] The traditional infrared receiving circuit adopts different noise suppression modes for different re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/60H04B10/114
Inventor 徐栋徐玉婷沈天平
Owner CRM ICBG (WUXI) CO LTD
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