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EP0459446A1
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EP
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Numerical controlled oscillator
Assignee: Sony Corp
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Filing: 1991-05-29
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Granted: —
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Expires: 2011-05-29
Abstract
Abstract The output oscillation frequency of the oscillator is controlled depending on input numerical data (N,L) and comprises: first accumulation means (3,4) for accumulating a first set value (N) which is set depending on the input numerical data with a first frequency (F c ) and sequentially outputting the accumulated value; second accumulation means for accumulating a second set value (L) which is set depending on the input numerical data with a second frequency and varying the first set (N) value by a predetermined value temporarily when the accumulated value reaches a predetermined maximum value; and frequency generation means (6,7) for outputting a frequency depending on an output of the first accumulation means as an oscillation frequency.
Inventors
- 👤 Katsuya Hori
- 👤 Biichiro Mornaga
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:08
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/099; H03L7/0991; H03L7/0994; G; G06; G06F; G06F1/00; G06F1/02; G06F1/03; G06F1/0321; G06F1/0328
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A numerical control type oscillator whose output oscillation frequency is controlled depending on input numerical data, comprising: first accumulation means for accumulating a first set value which is set depending on said input numerical data with a first frequency and sequentially outputting the accumulated value; second accumulation means for accumulating a second set value which is set depending on said input numerical data with a second frequency and varying said first set value by a predetermined value temporarily when the accumulated value reaches a predetermined maximum value; and frequency generation means for outputting a frequency depending on an output of said first accumulation means as an oscillation frequency.
Claim 2
Dependent Claim
46 words
A numerical control type oscillator according to claim 1, wherein a differential value between the accumulated value of said second accumulation means and said maximum value is set to a new accumulated value when the accumulated value of said second accumulation means reaches said maximum value.
Claim 3
Dependent Claim
30 words
A numerical control type oscillator according to claim 2, wherein the accumulated value of said second accumulation means is initialized to 0 at the time of starting of the operation.
Claim 4
Dependent Claim
20 words
A numerical control type oscillator according to claim 1, wherein said second frequency is obtained by dividing said first frequency.
Claim 5
Dependent Claim
51 words
A numerical control type oscillator according to claim 1, wherein said frequency generation means is a memory which stores each value of a waveform data of a period obtained by dividing by the time base in each address and an output of said first accumulation means is used as each address.
Claim 6
Dependent Claim
132 words
A numerical control type oscillator for generating a reference frequency which is controlled by a numerical value data depending on a phase error component of a reception frequency and the phases of the reference frequency and the reception frequency are compared, comprising: first accumulation means for accumulating a first set value which is set depending on said input numerical data with a first frequency and sequentially outputting the accumulated value; second accumulation means for accumulating a second set value which is set depending on said numerical data with a second frequency and varying said first set value by a predetermined value temporarily when the accumulated value reaches a predetermined maximum value; and frequency generation means for outputting a frequency depending on an output of said first accumulation means as said reference frequency.
References Cited (Backward Citations)
US3824498A
Cited
EP0312370A2
Cited
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