Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-12-01
1985-04-02
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
375 28, 332 11D, 340347NT, H03K 1322
Patent
active
045090378
ABSTRACT:
An improved analog-to-digital encoder comprising an enhanced delta modulation encoder. The enhanced delta modulation encoder includes a spectrum tilter, a 1 bit analog-to-digital converter, a sampling circuit and an internal decoder. An analog input signal and an internal analog signal from the internal decoder are summed to provide an analog dither which is essentially an internal error signal. The analog dither signal is tilted by the spectrum tilter and is provided to the 1 bit analog-to-digital converter which generates a digital signal. The sampling circuit receives the digital signal from the analog-to-digital converter and generates a digital output which is fed back to the internal decoder. The spectrum tilter comprises at least three integrator circuits and a clipping circuit connected in parallel to two of the three integrator circuits. The three integrator circuits tilt the frequency spectrum of noise above the maximum frequency of interest, and the clipping circuit prevents the encoder from becoming unstable. A digital filter may be connected to the output of the sampling circuit in order to filter the digital output to make it compatible with systems commonly employed to process the digital output.
REFERENCES:
patent: 3244808 (1966-04-01), Roberts
patent: 3273141 (1966-09-01), Hackett
patent: 3490045 (1970-01-01), De Boer
patent: 3516022 (1970-06-01), Brolin
patent: 3825831 (1974-07-01), Isaiguro
patent: 4161633 (1979-07-01), Treiber
patent: 4313204 (1982-01-01), De Freitas
Panther "Modulation, Noise, and Spectral Analysis", McGraw Hill 1965, pp. 679-699 cited by applicant.
Winkler "High Information Delta Modulation" IEEE International Convention Record Part 8 1963, pp. 260-265 cited by applicant.
Gould Inc.
Miller Charles D.
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