Method of automatically setting the gain of an interrogator receiver within a non-contacting identification system

An automatic setting and non-contact technology, which is applied to TV system components, transmission systems, gain control, etc., and can solve problems such as unused pulse signals

Active Publication Date: 2006-02-08
AMS INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The circuit anticipates continuous signals but does not exploit the characteristics of pulsed signals in the form of wave packets

Method used

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  • Method of automatically setting the gain of an interrogator receiver within a non-contacting identification system

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Embodiment Construction

[0013] In a contactless identification system consisting of an interrogator and transponders, an improved method of automatically setting the gain of the interrogator receiver is used.

[0014] The present invention improves on the known method in which an attack is initiated each time the amplified input signal exceeds the attack threshold voltage level Vatt and decay is initiated after the attack has ended, as follows.

[0015] After the attack is over, a waiting period is provided during which the amplifier does not respond on gain setting. However, the amplifier responds with decay after the expiration of the wait period that begins when the value of the transiently amplified signal last exceeds the wait threshold voltage level Vw after the end of the attack.

[0016] The shortest and longest time intervals between adjacent pulses in a data wave packet are accurately determined by the communication protocol, i.e. the signal spectrum is known and for the use of the method o...

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Abstract

An attack is activated in a receiver amplifier of an interrogator whenever an amplified input signal exceeds an attack threshold voltage value Vatt, and the receiver amplifier at least during a waiting period, the length of which preferrably equals the double length of the longest time interval between adjacent pulses in a transponder data wave packet, after the end of the attack does not respond in the sense of setting the gain. However, the amplifier responds with a decay activated after the lapse of the waiting period, which started when the instantaneous amplified signal value for the last time after the end of the attack exceeded a waiting threshold voltage level Vw. The decay rate is of the same order of magnitude as the attack rate.The improved method for automatically setting the gain renders it possible that the interrogator receiver within the non-contacting identification system practically does not change the essential characteristics of the input signal.

Description

technical field [0001] The present invention relates to an improved method of automatically setting the gain of an interrogator receiver in a contactless identification system comprising an interrogator and a plurality of transponders each time the amplified input signal exceeds an attack threshold voltage level The improvement is achieved by taking into account the communication characteristics between interrogator and transponder by activating the attack of the receiver amplifier of the interrogator at ordinary times and activating the decay after the attack is over. Background technique [0002] A contactless identification system consists of an interrogator that generates radio frequency electromagnetic waves and one or more transponders that act as energy sources to them. By sending an appropriately modulated received wave, the transponder sends data to the interrogator. [0003] The change in the level of the received signal produced by the modulation is amplified in ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06K7/08H03G3/30H04B7/005H04N5/53H04L27/08G10H1/02H04B1/00H03G3/20H04B5/48
CPCH03G3/3078G06K17/00G06K7/08H04B1/06H04B5/48
Inventor温科·昆茨安东·施特恩
OwnerAMS INT