US4634966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binary processing of sound spectrum
Assignee: Ricoh Co Ltd
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Filing: 1985-03-19
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Granted: 1987-01-06
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Expires: 2005-03-19
Abstract
Abstract A frequency spectral distribution of sound signal has a plurality of discrete data at respective channels where sampling takes place. Such a spectral distribution, defining a parallel signal, is converted into a time series signal which is used to produce a peak-detected signal and a zero-cross signal. Then, based on the timing of the zero-cross signal, the peak-detected signal is compared with the original parallel signal to process the original parallel signal to be binary-valued. The present invention provides a simple hardware structure having the above-described function.
Inventors
- 👤 Tomofumi Nakatani
- 👤 Shogo Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:10
CPC Classifications
G; G01; G01R; G01R23/00; G01R23/16; G01H; G01H3/00; G01H3/04; G01H3/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A system of processing a spectrum of sound to be binary-valued, comprising: sample and hold means for sampling and holding a parallel signal of said spectrum of sound; converting means for converting said parallel signal into a time series signal; peak detecting means for detecting a peak of said time series signal and for producing a peak-detected signal; zero-cross detecting means for detecting zero-crossing of said time series signal and for producing a zero-cross signal; comparing means for comparing the level of said parallel signal with the level of said peak-detected signal and for supplying a binary output signal as a result of a comparison using said peak-detected signal as a threshold; means for supplying a control signal in association with said zero-cross signal; and latching means for latching the binary output signal from said comparing means in accordance with said control signal.
Claim 2
Independent Claim
143 words
A system of processing a spectrum of sound to be binary-valued, comprising: sample and hold means for sampling and holding a parallel signal of said spectrum of sound; converting means for converting said parallel signal into a time series signal; peak detecting means for detecting a peak of said time series signal and for producing a peak-detected signal; zero-cross detecting means for detecting zero-crossing of said time series signal and for producing a zero-cross signal; comparing means for comparing the level of said parallel signal with the level of said peak-detected signal and for supplying a binary output signal as a result of a comparison using said peak-detected signal as a threshold; means for supplying a control signal in association with said zero-cross signal; and latching means for latching the binary output signal from said comparing means in accordance with said control signal.
Claim 3
Dependent Claim
16 words
The system of claim 1 wherein said peak-detected signal is weighted for use as a threshold.
Claim 4
Dependent Claim
43 words
The system of claim 1 wherein those portions of said parallel signal which reside in a time period while said zero-cross signal is at a selected one of the low and high level are latched at the same time by said zero-cross signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |