Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-11-24
1984-01-10
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347CC, 340347M, H03K 1302
Patent
active
044255616
ABSTRACT:
Signal information is converted between analog and digital form in a two-step process employing conversion apparatus having stable, but not necessarily highly accurate components. The component tolerances on such conversion apparatus are much greater than those normally allowed on conventional conversion apparatus of equal accuracy. In an A/D conversion, an analog signal is first converted into an (n+m)-bit digital word in a special purpose digital code unique to the specific A/D conversion apparatus. The (n+m)-bit word is then translated into an n-bit word in binary digital code in accordance with a predetermined relationship therebetween. In a D/A conversion, an n-bit digital word in a binary digital code is first translated into a corresponding (n+m)-bit digital word in the special purpose digital code. The (n+m)-bit word is then converted into an equivalent analog signal; the latter step being performed by a conversion apparatus unique to the special purpose digital code. A plurality of A/D and D/A converters suitable for use with the present invention are disclosed. A number of converter calibration techniques are also disclosed.
REFERENCES:
patent: 3214147 (1965-11-01), Chapman
patent: 3216001 (1965-11-01), Hinrichs
patent: 4029949 (1977-06-01), Dew
patent: 4070665 (1978-11-01), Glennon et al.
patent: 4097848 (1978-06-01), Stella et al.
Data Acquisition Products Catalog-Analog Devices Incorporated, Norwood, Massachusetts, pp. 303-304.
Analog-Digital Conversion Handbook, Eng. Staff of Analog Devices Inc., Norwood Mass. pp. I-64-I-65, II-34-II-39.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. II-46 to II-48; II-80 & 81.
Whiteside Arliss E.
Wolber William G.
Ignatowski James R.
Sloyan T. J.
The Bendix Corporation
Wells Russel C.
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