Pulse or digital communications – Repeaters – Testing
Patent
1996-02-27
1998-11-03
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375216, 375322, 455142, H04B 1707, H04B 106, H03D 300, H04L 2700
Patent
active
058320270
ABSTRACT:
A spread spectrum modulating and demodulating apparatus which is capable of providing FSK or PSK spread spectrum communications. In a transmitting device an input information signal is fed either to an oscillator or to a side of a power supply which is in turn connected to an operation device. An oscillator produces a carrier frequency signal which multiplied by a multiplier by the predetermined integer N1. A frequency divider divides the frequency of the carrier by a predetermined integer N2. A spread code generator uses an output signal of the frequency divider as a clock signal, and generates a spread code which is fed to the operation device. A switch selectively feeds an input information signal to either the oscillator for frequency shift keying the oscillator or through the side of the power supply connected to the operation device will effect a phase shift key operation. A spread spectrum demodulating device additionally provides for demodulation of either a frequency shift keyed signal or a phase shift keyed signal.
REFERENCES:
patent: 3828307 (1974-08-01), Hungerford
patent: 4435822 (1984-03-01), Spencer et al.
patent: 5101417 (1992-03-01), Richley et al.
Chin Stephen
Gluck Jeffrey W.
Victor Company of Japan Ltd.
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