Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1976-08-25
1977-11-15
Griffin, Robert L.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
325459, 332 1, 340347DA, 358191, 178 68, H04B 106
Patent
active
040587720
ABSTRACT:
A method of and apparatus for converting a plural-bit digital signal to a pulse width modulated signal which, thereafter, can be filtered to derive an analog signal level corresponding to the value of the digital signal. A periodic timing signal is produced and each period thereof is divided into predetermined sections. The value of the digital signal is divided by a factor equal to the number of predetermined sections, and the divided digital signal is converted into a corresponding pulse width modulated signal during each of the timing sections. The pulse width of the pulse width modulated signal in selected ones of the timing sections is selectively increased by a predetermined amount in the event that the divided digital value is not an integral number. In particular, the number of such timimg sections wherein the pulse width of the pulse width modulated signal is increased is equal to the remainder obtained after the value of the digital signal is divided.
REFERENCES:
patent: 3422423 (1969-01-01), Kaszynski et al.
patent: 3576575 (1971-04-01), Hellwarth et al.
patent: 3707713 (1972-12-01), Diaz et al.
patent: 3968440 (1976-07-01), Ehni
Mogi Takao
Taki Akira
Yamazaki Hiroshi
Eslinger Lewis H.
Griffin Robert L.
Psitos Aristotelis M.
Sinderbrand Alvin
Sony Corporation
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