Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1986-08-13
1987-09-15
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
350 9614, 356349, H03M 100
Patent
active
046942769
ABSTRACT:
A guided-wave electrooptic analog-to-digital converter utilizes a multiple wavelength optical source as a sampling source to minimize the number of interferometers needed for conversion of an analog signal with a given resolution. A reduction in the number of interferometers reduces the capacitive impedance of the analog signal input and facilitates driving the converter with conventional R.F. amplifiers. The multiple-wavelength signal consists of a combination of a plurality of signals with wavelengths which are substantially binary multiples of the shortest wavelength. The signals are passed together through a conventional Mach-Zehnder interferometric modulator and the interferometer output is split back into a plurality of output beams each with a single wavelength. Each of the output beams represents a bit of the digitized signal. By increasing the number of different wavelengths in the sampling signal, higher resolutions in the output signal can be obtained with a single interferometric modulator.
REFERENCES:
patent: 4325603 (1982-04-01), Marom
patent: 4515430 (1985-05-01), Johnson
patent: 4571576 (1986-02-01), Olsson
Analog Devices Inc.
Miller Charles D.
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