Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1974-03-25
1976-01-20
Safourek, Benedict V.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
325 62, 179 82, 333 14, 343200, H04B 500
Patent
active
039342026
ABSTRACT:
An electronic tour guide system including means for suppressing objectionable crosstalk and noise is described. Crosstalk suppression is achieved by means of a comprssor in the transmitter and an expander in the receiver. Objectionable noise between loops is eliminated by means of a squelch circuit which reduces power drain whenever the received signal is below a certain threshold. The transmitter and receiver are designed to handle a plurality of information signals simultaneously. For example, a listener can select one of several different languages broadcast within an antenna loop. The transmitting loop antenna is matched in impedance to the output of the channel means in the transmitter so that maximum power transfer is obtained. Each receiver is further equipped with a gravity operated mercury switch which turns off power to the receiver when the receiver chasis is inverted. It is anticipated that this system will find application in museums, art galleries, archeological sites and the like where it is desirable to guide people from location to location and to address them in their respective languages.
REFERENCES:
patent: 2193966 (1940-03-01), Jones
patent: 2567431 (1951-09-01), Halstead
patent: 2883523 (1959-04-01), Meserow
patent: 3078348 (1963-02-01), McIntosh
patent: 3474451 (1969-10-01), Abel
patent: 3601550 (1971-08-01), Spracklen
patent: 3769612 (1973-10-01), Yamazaki
patent: 3798562 (1974-03-01), Takahashi et al.
patent: 3852520 (1974-12-01), Bruch
Safourek Benedict V.
Telesonic Systems, Inc.
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