DocumentCode :
1063818
Title :
An Approach to Ultrasonic Remote Control Systems
Author :
Alfke, Peter ; Doyle, Norman ; Hamaoui, Moise ; Hibbe, Otto
Author_Institution :
Fairchild Semiconductor
Issue :
4
fYear :
1973
Firstpage :
256
Lastpage :
262
Abstract :
Remote control systems for television receivers have, in general, tended to fall into the category described by the block diagram shown in Figure 1. This usually consists of an ultrasonic CW generator which transmits a specific frequency to the receiver for each control function required. The receiver system comprises an ultrasonic pick-up transducer and amplifier feeding the received signal to a series of tuned band-pass amplifiers, one for each frequency. The detected signal is then used to activate the desired control function. The signal frequencies employed are in the 30 to 50kHz range. Some of the problems with this type of system include range and directionality of the transmitter, receiver response to spurious inputs, e. g. coin/key noises, and the complexity of the receiver circuitry and its alignment. It is to this latter problem that this paper principally addresses itself.
Keywords :
Active filters; Control systems; Cutoff frequency; Detectors; Frequency conversion; RLC circuits; TV receivers; Transmitters; Ultrasonic transducers; Voltage control;
fLanguage :
English
Journal_Title :
Broadcast and Television Receivers, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9308
Type :
jour
DOI :
10.1109/TBTR1.1973.299773
Filename :
4080148
Link To Document :
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