1975-03-10
1976-08-24
Miller, Charles D.
H04B 166
Patent
active
039768422
ABSTRACT:
An analog rate changer which has a pair of fall-through registers that are controlled to develop analog output signals which bear substantially the same wave shape and amplitude information borne by the analog input signals, but which have a selected greater or lesser frequency spectrum than that of the analog input signals. In a time contraction mode in which the frequency spectrum is reduced, digital signals corresponding to the analog input signals are alternately clocked into the two fall-through registers at a write rate and continuously clocked out of both registers at a read rate which is less than the write rate. In a time expansion mode in which the frequency spectrum is increased, the digital signals are continuously clocked into both registers at a write rate and alternately clocked out of the registers at a read rate which is greater than the write rate. In both modes of operation, both the read rate and the write rate are synchronized with a conversion sampling rate of an A/D converter which produces the digital signals operated on by the fall-through registers. This permits alteration of the conversion sampling rate without alteration of the ratio between the read rate and the write rate. Reduction of the write rate relative to the read rate to reduce the frequency spectrum of the output signal relative to the input signal reduces the write rate relative to the conversion sampling rate. This reduces the proportion of digital signals developed by the A/D converter that are clocked into the registers and permits increasing the conversion sampling rate to maintain the absolute write rate at an optimum level. When the write rate is two times greater than the read rate, the analog outputs from the two registers may be kept separated to provide a stereo effect. Alternately, a mixer circuit is provided to blend the two signals together to provide a single output signal.
REFERENCES:
patent: 3816664 (1974-06-01), Koch
patent: 3863026 (1975-01-01), Dildy
Hayward Research, Inc.
Miller Charles D.
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