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US4959616A
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Digital oscillation apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1988-10-11
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Granted: 1990-09-25
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Expires: 2008-10-11
Abstract
Abstract A digital oscillation apparatus includes a data generator and an accumulator which function as follows. The data generator is responsive to each clock of a clock signal having a frequency fc for generating data used to generate a data string which has a total value R (R is an integer) in a repetition period of m clocks (m is an integer). Accordingly, the average value of each data of the data string generated in response to each clock becomes R/m. The accumulator has a dynamic range D (D is an integer) and is responsive to each clock of the clock signal for accumulating a sum of each data (average value=R/m) of the data string generated by the data generator and a constant A (A is an integer) until the accumulated result exceeds the dynamic range. That is, data having an average value A+R/m is accumulated in response to each clock of the clock signal. When the accumulated result exceeds the dynamic range D, the accumulator subtracts the dynamic range D from the accumulated result, or resets the accumulated result. If the values of R, m, A and D are set to satisfy a relationship of fs/fc= (A+R/m)D, where fs is a frequency of a periodic waveform data to be generated as an output of the apparatus, the accumulator generates periodic waveform data having a frequency fs=(A+R/m)·fc/D.
Inventors
- 👤 Tokikazu Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:12
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; G; G06; G06F; G06F7/00; G06F7/60; G06F7/68; G06F1/00; G06F1/02; G06F1/03; G06F1/0321; G06F1/0328; G06F1/0335; G06F7/38; G06F7/48; G06F7/544; G06F7/548; H03K4/02; H03K4/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
A digital oscillation apparatus for generating a periodic waveform data having a frequency fs comprising: a data generating means responsive to each clock of a clock signal having a frequency fc for generating data used to periodically generate a data string having a constant total value of R with a period of m clocks so that the average value of each data of the data string generated in response to each clock of the clock signal is R/m, where each of R and m is an integer; and an accumulating means having a dynamic range D, where D is an integer, and being responsive to each clock of the clock signal for accumulating a sum of each data of the data string generated by said data generating means and a constant A, wherein A is an integer, to obtain accumulated data until the accumulated data exceeds the dynamic range D and for subtracting the dynamic range D from the accumulated data when the accumulated data exceeds the dynamic range D, thereby generating a periodic waveform data having a frequency fs, wherein the values of R, m, A and D satisfy a condition of fs/fc=(A+R/m)/D so that the frequency fs of the periodic waveform data becomes fs=(A+R/m)·fc/D.
Claim 2
Dependent Claim
206 words
A digital oscillation apparatus for generating a periodic waveform data having a frequency fs comprising: a data generating means responsive to each clock of a clock signal having a frequency fc for generating data used to periodically generate a data string having a constant total value of R with a period of m clocks so that the average value of each data of the data string generated in response to each clock of the clock signal is R/m, where each of R and m is an integer; and an accumulating means having a dynamic range D, where D is an integer, and being responsive to each clock of the clock signal for accumulating a sum of each data of the data string generated by said data generating means and a constant A, wherein A is an integer, to obtain accumulated data until the accumulated data exceeds the dynamic range D and for subtracting the dynamic range D from the accumulated data when the accumulated data exceeds the dynamic range D, thereby generating a periodic waveform data having a frequency fs, wherein the values of R, m, A and D satisfy a condition of fs/fc=(A+R/m)/D so that the frequency fs of the periodic waveform data becomes fs=(A+R/m)·fc/D.
Claim 3
Dependent Claim
105 words
A digital oscillation apparatus according to claim 1, wherein said data generating means generates, as the data string, a data "1" in response to R clocks out of m clocks and a data "0" in response to the remaining m-R clocks, and wherein said accumulating means comprises: a delay means for delaying data inputted thereto by one clock period; and an adding means for adding the constant A, output data of said delay means and, as a carry, the data generated by said data generating means, the added data being fed to said delay means and at the same being outputted as the accumulated data.
Claim 4
Dependent Claim
78 words
A digital oscillation apparatus according to claim 2, wherein said data generating means comprises: a delay means for delaying data inputted thereto by one clock period; and an adding means for adding the constant D and output data of said delay means, the added data being fed to said delay means, and for generating a carry data "1" when the added data exceeds m, the carry data being outputted as the data generated by said data generating means.
Claim 5
Dependent Claim
79 words
A digital oscillation apparatus according to claim 2, wherein said data generating means comprises: a counting means for dividing the clock signal frequency by m; and a memory means having a data "1" stored therein in R addresses out of m addresses and having a data "0" stored in the remaining m-R addresses for outputting the stored data, as the data generated by said data generating means, according to an output of said counting means received as address data.
Claim 6
Dependent Claim
46 words
A digital oscillation apparatus according to claim 1, further comprising a memory means having data corresponding to a predetermined waveform stored therein for receiving the waveform data from said accumulating means as address data for outputting the stored data to obtain a predetermined periodic waveform data.
Claim 7
Dependent Claim
18 words
A digital oscillation apparatus according to claim 5, wherein said memory means has sinusoidal waveform data stored therein.
Claim 8
Dependent Claim
28 words
A digital oscillation apparatus according to claim 5, further comprising a digital-to-analog conversion means for converting the waveform data from said memory means to an analog waveform signal.
Claim 9
Dependent Claim
28 words
A digital oscillation apparatus according to claim 1, further comprising a digital-to-analog conversion means for converting the waveform data from said accumulating means to an analog waveform signal.
References Cited (Backward Citations)
US2858434A
Cited
US3121803A
Cited
US3657657A
Cited
US3919649A
Cited
JPS58165416A
Cited
JPS58181315A
Cited
US4692713A
Cited
US4727570A
Cited
JPS62150922A
Cited
US4737720A
Cited
US4804863A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-09-24 | 1994-03-26 | 1994-09-25 | $2000.00 | Window Closed / Lapsed |
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