Digital signal transmission apparatus, digital signal transmissi

Details Digital signal transmission apparatus, digital signal transmissi Digital signal transmission apparatus, digital signal transmissi

1995-06-26

1997-02-11

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359183, 375281, 375298, 375308, 371 30, H04B 1004

Patent

active

056026692

ABSTRACT:
A digital signal transmitting apparatus, a digital signal transmitting method, and a digital signal transmitter-receiver, for transmitting a digital signal within a specified frequency band by using an infrared transmission method. An infrared signal within a specified frequency band can be obtained by using a QPSK modulation circuit 13 having roll-off filters 132 and 133 and applying roll-off filtering and QPSK modulation to an inputted digital audio signal, and thereby generating a digital modulated signal S2 whose bandwidth is narrowed and driving an infrared emitter based on the modulated digital audio signal S2.

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"Cursor Controller/Graphics Pad", IBM Technical Disclosure Bulletin, vol. 28, No. 9, Feb. 1986, pp. 4093-4097.

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