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US5126737A
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Method for converting a digital signal into another digital signal having a different sampling frequency
Assignee: Yamaha Corp
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Filing: 1991-04-15
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Granted: 1992-06-30
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Expires: 2011-04-15
Abstract
Abstract A conversion method converts a first digital signal having a first sampling period to a second digital signal having a second sampling period which is different from the first sampling period. The method comprises four steps. In the first step, the first digital signal is oversampled. In the next step, the sample value of the oversampled signal maintains an identical value during a short period corresponding to a common multiple of the first sampling period and the second sampling period. In the third step, an interpolation process is carried out. Finally, the second digital signal is outputted by sampling at the second sampling period.
Inventors
- 👤 Junji Torii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:59
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/06; H03H17/0621; H03H17/0635; H03H17/065; H03H17/0657
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A method for converting an initial digital signal having an initial sampling frequency to a final digital signal having a final sampling frequency, comprising the steps of: first sampling the initial digital signal having a predetermined sampling frequency by a first sampling frequency to thereby convert the initial digital signal into a first digital signal having the first sampling frequency of an integral multiple of the predetermined sampling frequency; extending a hold-period of sample values of the first digital signal by a predetermined period to form a second digital signal; second sampling the second digital signal by a second sampling frequency to thereby generate a third digital signal, said second sampling frequency being higher than the first sampling frequency and an integral multiple of the final sampling frequency; interpolating the third digital signal to thereby generate a fourth digital signal; and third sampling the fourth digital signal by the final sampling frequency to thereby generate the final digital signal.
Claim 2
Independent Claim
159 words
A method for converting an initial digital signal having an initial sampling frequency to a final digital signal having a final sampling frequency, comprising the steps of: first sampling the initial digital signal having a predetermined sampling frequency by a first sampling frequency to thereby convert the initial digital signal into a first digital signal having the first sampling frequency of an integral multiple of the predetermined sampling frequency; extending a hold-period of sample values of the first digital signal by a predetermined period to form a second digital signal; second sampling the second digital signal by a second sampling frequency to thereby generate a third digital signal, said second sampling frequency being higher than the first sampling frequency and an integral multiple of the final sampling frequency; interpolating the third digital signal to thereby generate a fourth digital signal; and third sampling the fourth digital signal by the final sampling frequency to thereby generate the final digital signal.
Claim 3
Dependent Claim
40 words
A method for converting an initial digital signal having an initial sampling frequency to a final digital signal having a final sampling frequency according to claim 1, wherein said step of interpolating includes a step of: performing a straight-line interpolation.
Claim 4
Dependent Claim
40 words
A method for converting an initial digital signal having an initial sampling frequency to a final digital signal having a final sampling frequency according to claim 1, further comprising the step of: controlling sampling timing for the fourth digital signal.
Claim 5
Dependent Claim
131 words
Method for exchanging digital signals between two asynchronous digital systems comprising the steps of: sampling an input digital signal with a first predetermined sampling frequency to generate a first digital signal having a frequency which is a multiple of said predetermined sampling frequency; filtering each sampled value of said first digital signal with a first filter having an impulse response; sampling said filtered first digital signal with a second sampling frequency to generate a second digital signal, said second sampling frequency being higher than said first sampling frequency and being a multiple of a second predetermined sampling frequency; filtering said second digital signal with an interpolation filter to generate a third digital signal; and sampling said third digital signal with said second predetermined sampling frequency to generate an output digital signal.
Claim 6
Dependent Claim
131 words
Method for exchanging digital signals between two asynchronous digital systems comprising the steps of: sampling an input digital signal with a first predetermined sampling frequency to generate a first digital signal having a frequency which is a multiple of said predetermined sampling frequency; filtering each sampled value of said first digital signal with a first filter having an impulse response; sampling said filtered first digital signal with a second sampling frequency to generate a second digital signal, said second sampling frequency being higher than said first sampling frequency and being a multiple of a second predetermined sampling frequency; filtering said second digital signal with an interpolation filter to generate a third digital signal; and sampling said third digital signal with said second predetermined sampling frequency to generate an output digital signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |