Patent US4831464A successfully refreshed from Google Patents.
US4831464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal recording conditioning device
Assignee: Pioneer Corp
•
Filing: 1987-11-30
•
Granted: 1989-05-16
•
Expires: 2007-11-30
Abstract
Abstract In a signal recording circuit, a dither signal in a frequency band of from a frequency higher than 1/2 of the sampling frequency of a recording signal to a frequency lower than (n-1/2) of the sampling frequency (where n is an integer larger than 1) is added to the recording signal in an addition circuit, and the output of the addition circuit is subjected to analog-to-digital conversion with a frequency n times the sampling frequency.
Inventors
- 👤 Masaru Chijiiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:07
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G11B20/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
A signal recording conditioning device, comprising: a dither signal generating circuit for generating a dither signal in a frequency band extending from a frequency higher than 1/2 of a recording signal sampling frequency to a frequency lower than (n-1/2) of said recording signal sampling frequency wherein n is an integer greater than 1; an addition circuit for adding said dither signal to a recording signal; an analog-to-digital converter circuit for subjecting an output of said addition circuit to analog-to-digital conversion with a frequency which is n times said sampling frequency; a digital filter for removing a high frequency component from an ouput of said analog-to-digital converter circuit; and a sampling circuit for sampling an output of said digital filter at said sampling frequency.
Claim 2
Dependent Claim
123 words
A signal recording conditioning device, comprising: a dither signal generating circuit for generating a dither signal in a frequency band extending from a frequency higher than 1/2 of a recording signal sampling frequency to a frequency lower than (n-1/2) of said recording signal sampling frequency wherein n is an integer greater than 1; an addition circuit for adding said dither signal to a recording signal; an analog-to-digital converter circuit for subjecting an output of said addition circuit to analog-to-digital conversion with a frequency which is n times said sampling frequency; a digital filter for removing a high frequency component from an ouput of said analog-to-digital converter circuit; and a sampling circuit for sampling an output of said digital filter at said sampling frequency.
Claim 3
Dependent Claim
10 words
A conditioning device as recited in claim 1, wherein n=2.
Claim 4
Dependent Claim
42 words
A conditioning device as recited in claim 1, wherein said digital filter suppresses components of said output of said analog-to-digital converter extending from a frequency of 1/2 of said recording sampling frequency to a frequency of (n-1/2) of said recording sampling frequency.
References Cited (Backward Citations)
US4626158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |