Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1977-01-24
1978-10-31
Griffin, Robert L.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 11D, H03K 1322
Patent
active
041237099
ABSTRACT:
An adaptive delta modulation system wherein the input analog signal is periodically sampled and a binary bit is generated for each period, the logic level of the binary bit being dependent on whether the sampled signal is greater or smaller than the approximate signal of the previous sample. Decoding apparatus converts the stream of binary bits to approximate the analog signal by periodically charging or discharging a capacitor integrator by predetermined variable steps. The charging or discharging of the integrator during each period is determined by the logic level of the binary bits, whereas the increase or decrease in step size for successive periods is determined by successive similar signal binary bits or successive dissimilar bits, respectively. The increase or decrease in step size is achieved by storing a binary step size number S in a register and adding or subtracting a fraction of the number to or from itself during each period, producing a new step size number for each period. In addition, each added fraction may be increased by a fixed least significant number to enhance step size recovery between a transmitter and a receiver. The charge on the capacitor integrator is controlled by a pulse having a width that is directly related to the value of the S number. The pulse controls the conduction time of constant current sources which are connected to the integrator to produce the analog output signal.
REFERENCES:
patent: 3273141 (1966-09-01), Hackett
patent: 3500441 (1970-03-01), Brolin
patent: 3609551 (1971-09-01), Brown
patent: 3621396 (1971-11-01), Daugherty
patent: 3699566 (1972-10-01), Schindler
patent: 3716803 (1973-02-01), Candy
patent: 3757252 (1973-09-01), Deschenes
patent: 3784922 (1974-01-01), Blahut
patent: 3806806 (1974-04-01), Brolin
patent: 3905028 (1975-09-01), Wintz et al.
patent: 3913016 (1975-10-01), Candy
patent: 4044306 (1977-08-01), Villeret
Dodds David E.
Sendyk Andrzej M.
Wohlberg Donald B.
Canadian Patents and Development Limited
Griffin Robert L.
Masinick Michael A.
Rymek Edward
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