Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1979-11-23
1982-08-24
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, H03K 1302
Patent
active
043463681
ABSTRACT:
A conventional digital-to-analog converter (DAC) which has a plurality of input lines is modified by adding another input line below that of the original least significant bit position. The additional input line is connected internally of the DAC exactly like the original least significant bit line. External of the DAC, the input line connected to the most significant bit position of the DAC is a direct line, i.e. there are no additional elements in that input line. There is an inverter in the additional input line, while the intermediate input lines, which vary in number depending upon the length of the coded input, include EXCLUSIVE-NOR gates. A resistor sufficient in value to set the output of the DAC about zero is connected between the reference voltage input connection and the output connection of the DAC.
REFERENCES:
patent: 3373421 (1968-03-01), Wang
patent: 4021648 (1977-05-01), Sakata
Sklar, 2's Complement Arithmetic Operations, Computer Design, vol. 11, No. 5, 5/1972, pp. 115-121.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-16 through II-27.
Sloyan Thomas J.
The Boeing Company
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