Plural frequency signal generator
AssigneeGeneral Electric Company
InventorsClive J. Beckwith, Philip Wright, Charles E. Dingle
Life of this patent
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Abstract
For the purpose of generating oscillations having a plurality of different frequencies, a read-only memory stores a plurality of binary words which are read cyclically. The individual pulse signals supplied by the read-only memory, each such signal representing a succession of corresponding bits read from the read-only memory, are used to control latches and the required oscillations are obtained by filtering pulse signals supplied by the latches. To guard against equipment failure, the read-only memory and latches are duplicated, the pulse signals supplied by the two sets of latches being combined by means of gates before filtering.
Claims11
Apparatus for generating a plurality of electric signals, said apparatus comprising:
- (A) a read-only-memory having storage locations for a plurality of digital words,
- (B) means cyclically to address said storage locations to cause each digital word to be read out in turn, and
- (C) a plurality of means each responding to a corresponding different digit of the digital words read from the memory to derive respective electric pulse signals each of which have different fundamental frequencies.
A method of generating a plurality of electric signals of the kind in which the signals have different periodically recurring waveforms, said method comprising the steps of:
- (A) storing a respective multi-digit number in each of a plurality of locations of a read-only-memory,
- (B) cyclically addressing the read-only-memory to cause each of the multi-digit numbers to be read out in turn, and
- (C) individually processing each digit of the multi-digit numbers so read out to obtain a respective electric signal for each of the digits,
- (D) each of the electric signals having a respective different periodically recurring waveform related to the numerical values of the respective series of digits from which it is derived.
Dependencies are inferred from the claim text.