Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1984-07-23
1986-11-04
Shoop, Jr., William M.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, 340347DA, H03M 112
Patent
active
046212540
ABSTRACT:
In view of the limited speed times accuracy product of A-to-D and D-to-A converters, a required digital accuracy or sufficiently smooth analogue waveform cannot always be obtained. The present invention is useful in enhancing available converters. In the A-to-D version a stepped interpolation waveform obtained from a generator 13 is added to samples of an analogue waveform obtained from a sample-and-hold circuit 11 at a frequency 2f.sub.B (where f.sub.B is the bandwidth of the input signal). The resultant signal is applied to an n-bit A-to-D converter 15 operating at 2.sup.m times 2f.sub.B and the converter output is averaged using an accumulator 16 reset at 2f.sub.B. The accumulator output is a higher accuracy signal since it has m+n bits. An analogous technique is described for D-to-A conversion.
REFERENCES:
Candy, J. C. IEEE Trans. vol. COM-22, Mar. 74, p. 298.
Candy et al. IEEE Trans. vol. COM-24, Jan. 76, p. 33.
Towers, M. S. IEE Proc. vol. 129, Pt. G No. 1, Feb. 82, p. 19.
Short, K. L. "Microprocessors and Programmed Logic" Prentice Hall 1981, p. 424.
Ritchie et al. IEEE Trans. vol. COM-22, No. 11 Nov. 1974, p. 1797.
Bergmann Saul M.
Burr-Brown Corporation
Shoop Jr. William M.
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