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Patent Searching and Data


Title:
SINE WAVE GENERATION CIRCUIT
Document Type and Number:
Japanese Patent JP2008148013
Kind Code:
A
Abstract:

To digitally generate a sine wave with a small ROM capacity.

This sine wave generation circuit is provided with: a coefficient ROM 1 which stores coefficients expressing an angular frequency according to a desired frequency and a sampling frequency and two kinds of coefficients to one desired frequency; an accumulation operation part 2 which obtains the angular frequency at each sample point by sequentially adding coefficient values stored in the coefficient ROM 1 at each sampling frequency using one coefficient while an accumulated value does not exceed a threshold and using the other coefficient when the accumulated value exceeds the threshold; and a CORDIC 3 which generates a sine wave signal with the desired frequency by calculating an amplitude of the sine wave corresponding to the angular frequency at each sample point obtained by the accumulation operation part 2 and generates the sine wave signal with the desired frequency by a digital operation only by the two kinds of coefficients.


Inventors:
TAKAHASHI NAOKI
Application Number:
JP2006333040A
Publication Date:
June 26, 2008
Filing Date:
December 11, 2006
Export Citation:
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Assignee:
NIIGATA SEIMITSU KK
RICOH KK
International Classes:
H03B28/00
Attorney, Agent or Firm:
Kazuyuki Tachibana