Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-08-24
1980-11-04
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
328151, 340347M, 340347SH, H03K 13175
Patent
active
042323029
ABSTRACT:
The video speed logarithmic analog-to-digital converter includes a plurality of parallel paths. In a first path, a plurality of comparators compare an analog input signal with a plurality of logarithmically incremented first reference signals. The number of first reference signals which fail to exceed the analog input signal is converted into a binary representation of the most significant bits of the logarithm of the analog input signal. A second parallel path determines the least significant bits by producing a logarithmically attenuated analog input signal and comparing the attenuated analog input signal with a plurality of logarithmically incremented second reference signals. The number of second reference signals which fail to exceed the attenuated analog input signal is converted into a binary representation of the least significant bits of the logarithm of the analog input signal. A sample and hold circuit having one input, N outputs, N+1 temporary storage paths, and a control for cyclically connecting the stored analog values with the outputs is connected with the logarithmic converter.
REFERENCES:
patent: 3597761 (1971-08-01), Fraschilla et al.
patent: 3646548 (1972-02-01), Van Doren
patent: 3820112 (1974-06-01), Roth
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 1972, pp. I-29 to 31; III-1 to 4; III-78,79.
Gottschalk, Logarithmic Analog-to-Digital Converter Using Switched Attenuators, 2/1978, Rev. Sci. Instrum., vol. 49, No. 2, pp. 200-204.
Advertising brochure of Goetronix, Inc., AN802OL Logarithmic A/D Converter, 9/1977.
Karlson, On a Temperature Stabilized Wideband Operational Amplifier, 1971, Nucl. Instr. and Meth., 96, pp. 387-395.
Ohio Nuclear Inc.
Sloyan Thomas J.
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