Frequency resolution in a digital oscillator

Details Frequency resolution in a digital oscillator Frequency resolution in a digital oscillator

1985-07-05

1987-03-24

Heyman, John S.

Boots, shoes, and leggings

364721, H03B 1900

Patent

active

046528326

ABSTRACT:
A method and means for improving the frequency resolution in a digital oscillator is described. According to the principles of the present invention, a digital oscillator may be comprised of a frequency latch, a phase accumulator, and a ROM based waveform generator. Improved frequency resolution is achieved in the digital oscillator, without increasing ROM size by quantizing the summed output of a dither generator and the phase accumulator before sending the resultant multi-bit signal to a ROM. The contents of the ROM are sequentially addressed with the resultant multi-bit signal. The output of the ROMs comprise digital words corresponding to a desired waveform envelope.

REFERENCES:
patent: 3562420 (1971-02-01), Thompson
patent: 3877022 (1975-04-01), Lehman et al.
patent: 3999129 (1976-12-01), Kasson
patent: 4011438 (1977-03-01), Aufderheide et al.
patent: 4039951 (1977-08-01), Bruce et al.
patent: 4315219 (1982-02-01), Rochelcau et al.
patent: 4331941 (1982-05-01), Kovalick et al.
patent: 4345500 (1982-08-01), Alonso et al.
patent: 4346477 (1982-08-01), Gordy
patent: 4410954 (1983-10-01), Wheatley III
patent: 4449117 (1984-05-01), Fortescue
patent: 4454486 (1984-06-01), Hassun
patent: 4475220 (1984-10-01), Mattei et al.
patent: 4484296 (1984-11-01), Treise et al.
patent: 4506228 (1985-03-01), Kammeyer
"A Digital Frequency Synthesizer", Joseph Tierney, Chas. M. Rader, and Barnard Gold, IEEE Transactions on Audio and Electroacoustics, vol. AU-19, No. 1, Mar. 1971, pp. 48-57.
Schuchman, "Dither Signals and Their Effect on Quantization Noise", IEEE Trans. on Comm. Tech., pp. 162-165, Dec. 1964.
Shimizu et al., "Resolution Improvement in an A/D Converter by the Superposed Dither Signal", Elec. and Comm. in Japan, vol. 64-A, No. 12, pp. 1-8, 1981.
Vanderkooy et al., "Resolution Below the Least Significant Bit in Digital Systems with Dither", J. Audio Eng. Soc., vol. 32, No. 3, pp. 106-113, Mar., 1984.

Affiliated with

Also associated with

Rating

Frequency resolution in a digital oscillator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency resolution in a digital oscillator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency resolution in a digital oscillator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1356282