Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1977-11-21
1982-12-07
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347DA, 340347M, 375 26, H03K 1302
Patent
active
043630243
ABSTRACT:
A digital-to-analog converter operates in accordance with the .mu.255 compression law and includes an amplifier, a reference voltage source and a feedback resistor ladder attenuator from the amplifier output to its input. The attenuator is multiplicatively weighted and referenced to the reference voltage. A current source or sink including a linearly weighted resistor ladder is also connected to the amplifier input.
An analog-to-digital converter includes a similar resistor ladder attenuator and resistor ladder current source or sink at the input of a comparator. The attenuator is referenced to a reference potential. The digital signal is determined by logic circuitry responsive to the comparator output in a successive approximation operation.
REFERENCES:
patent: 2889409 (1959-06-01), Carbrey
patent: 3541354 (1970-11-01), Basham
patent: 3678504 (1972-07-01), Kaneko
patent: 3705359 (1972-12-01), Kappes
patent: 3882484 (1975-05-01), Brokaw et al.
patent: 4020485 (1977-04-01), Busby
patent: 4138667 (1979-02-01), Vogel
patent: 4164729 (1979-08-01), Simon et al.
Terman, Radio Engineers' Handbook, McGraw-Hill Book Co., 1943, pp. 215-217.
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