Circuit for converting from analog signal into digital signal an

Details Circuit for converting from analog signal into digital signal an Circuit for converting from analog signal into digital signal an

1977-12-27

1980-01-15

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347DA, 340347M, H03K 1302

Patent

active

041841522

ABSTRACT:
A signal converting circuit for converting an analog signal to a digital signal, or vice versa, comprises a sampling capacitor which is charged to an input signal level during the period of a sampling pulse. A reference capacitor grounded at one end receives charges from the sampling capacitor in response to a first clock pulse. A predetermined reference potential is impressed on a terminal of the sampling capacitor at the time of the sampling pulse and a ground potential at the time the sampling pulse is not present. The reference capacitor is charged in response to the first clock pulse, and is discharged in response to a second clock pulse which alternates with the first clock pulse. The presence of a potential at the sampling capacitor less than the predetermined reference potential is detected, and the cycles of discharging of the reference capacitor that occur until the potential at the sampling capacitor is less than the reference potential are counted.
Analog-to-digital (A/D) conversion is achieved by counting the number of discharges of the reference capacitor charged from the sampling capacitor. Digital-to-analog (D/A) conversion is carried out in the circuit when the sampling capacitor is charged to the predetermined potential of the sampling capacitor at the time a digital signal is taken out.

REFERENCES:
patent: 4051469 (1977-09-01), Ninomiya
patent: 4065766 (1977-12-01), Butler et al.
patent: 4070666 (1978-01-01), Butler et al.
patent: 4070667 (1978-01-01), Eichelberger
patent: 4074260 (1978-02-01), Butler et al.
patent: 4087812 (1978-05-01), Terman

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