Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-12-31
1985-06-04
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
323283, 323354, 340347M, H03K 1302
Patent
active
045217645
ABSTRACT:
A signal-controllable attenuator comprising a 17-bit multiplying-type digital-to-analog converter having an R/2R ladder network to set the bit weights, and controlled by a 6-bit remotely-generated command signal to vary the attenuation in steps of 1.5 dB through a range of 88 dB. The 1.5 dB steps are controlled by a 4-bit code signal responsive to two bits of the command signal. The 4-bit code signal is directed to four successive bit input terminals of the converter. Which four DAC input terminals are selected is controlled by a shifting matrix which shifts the four bits along the DAC input terminals to a position determined by the other four bits of the command signal.
REFERENCES:
patent: 3582941 (1971-06-01), Le Maout et al.
patent: 3646548 (1972-02-01), Van Doren
patent: 4021772 (1977-05-01), Cook et al.
patent: 4021800 (1977-05-01), Katagiri et al.
patent: 4048635 (1977-09-01), Bich
patent: 4099174 (1978-07-01), Svensson
patent: 4232302 (1980-11-01), Jagatich
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-60 to I-64; II-36 to II-41.
Analog Devices Incorporated
Sloyan T. J.
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