Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-02-20
1977-07-05
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, H03K 1302
Patent
active
040343677
ABSTRACT:
An analog-to-digital converter arranged to accept an analog input signal and to convert it into an output having digital form. The converter is characterized by a reference random noise source which generates random noise signals with uniform amplitude occurrence probability density in a given range, and by an amplitude comparator arranged to repeatedly compare the amplitude of the random noise signal with the amplitude of a signal varying with the analog signal to be converted. The amplitude comparator supplies output pulses in accordance with the comparisons, e.g., whenever the analog signal amplitude is greater than the random noise amplitude, and the number of pulses from the amplitude comparator in a measurement interval then digitally corresponds to the value of the analog signal and may be utilized, as in a display. Resolution of the converter is increased beyond the minimum amplitude increment of the random noise source signal in one embodiment by superposition on either the analog signal or the random noise signal of a triangular wave with an amplitude greater than the minimum amplitude increment of the random noise signal, and in another embodiment by superposition of a second random noise signal.
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Federal Scientific Corp., "Dithering Increases Dynamic Range . . . ," Aug. 1973, pp. 1-8.
Sugiyama Takashi
Tsuda Takashi
Sloyan Thomas J.
Yokogawa Electric Works, Ltd.
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