Transmitting and receiving apparatus for a radio headphone

Details Transmitting and receiving apparatus for a radio headphone Transmitting and receiving apparatus for a radio headphone

1991-12-31

1996-01-09

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359158, 359182, 381 2, H04J 1400

Patent

active

054833671

ABSTRACT:
A transmitter and receiving apparatus from a headphone, comprising a demodulating circuit for demodulating a received broadcasting signal into multi-channel data, a modulating circuit for frequency-modulating each channel of the multi-channel data with a different carrier frequency, said carrier frequencies being selectable by the user to avoid local interference, and a transmitting circuit for transmitting output data from said modulating circuit externally. There is also provided a receiver for a radio headphone, comprising a data receiving circuit for receiving data transmitted from an external transmitting circuit, a demodulator for dividing the data received by said data receiving circuit into separate frequency channels, an envelope detecting circuit for detecting envelopes of respective channel data, and an output circuit for outputting an output signal from said envelope detecting circuit as an analog sound signal so as to allow a user to listen to noiseless sound through a headphone.

REFERENCES:
patent: 3727062 (1973-04-01), Foster
patent: 4621282 (1986-11-01), Ahern
patent: 4677608 (1987-06-01), Forsberg
patent: 4882773 (1989-11-01), Maloney
patent: 4899388 (1990-02-01), Mlodzikowsk
patent: 4928318 (1990-05-01), Ibe
patent: 4941208 (1990-07-01), Olshansky
patent: 4949170 (1990-08-01), Yanagidaira
patent: 4959827 (1990-09-01), Grotzinger
patent: 5136411 (1992-08-01), Paik

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