Patent US4472478A successfully refreshed from Google Patents.
US4403263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for processing audio PCM digital signals
Assignee: Toshiba Corp
•
Filing: 1980-11-14
•
Granted: 1983-09-06
•
Expires: 2000-11-14
Abstract
Abstract A processing system for reproduced audio digital signals used in an audio PCM (pulse code modulation) recording/reproducing system using a recording/reproducing apparatus such as a video tape recorder having a dropout-compensation circuit is disclosed. The reproduced signal processing system is connected to receive digital information signals reproduced through the dropout compensation circuit from a recording medium on which audio information signals are recorded in the form of digital data words and includes circuit means for detecting whether a reproduced digital signal is dropout-compensated or not and circuit means for adding an error pointer to a reproduced digital signal which is detected as being dropout-compensated.
Inventors
- 👤 Satoshi Kageyama
- 👤 Tadashi Kojima
- 👤 Shigeru Todokoro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:25
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1806; G11B20/1809
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A reproduced digital audio information signal processing system used with a reproducing system having a dropout compensation circuit for reproducing audio information signals recorded on a recording medium in the form of digital data words through said dropout compensation circuit comprising: dropout compensation detecting means for detecting whether a reproduced digital signal is dropout-compensated or not; and means responsive to said dropout compensation detecting means to add an error pointer signal to said reproduced digital signal when said reproduced digital signal is detected as being dropout-compensated.
Claim 2
Dependent Claim
86 words
A reproduced digital audio information signal processing system used with a reproducing system having a dropout compensation circuit for reproducing audio information signals recorded on a recording medium in the form of digital data words through said dropout compensation circuit comprising: dropout compensation detecting means for detecting whether a reproduced digital signal is dropout-compensated or not; and means responsive to said dropout compensation detecting means to add an error pointer signal to said reproduced digital signal when said reproduced digital signal is detected as being dropout-compensated.
Claim 3
Dependent Claim
54 words
A system according to claim 1, wherein said dropout compensation detecting means includes a delay circuit for delaying a reproduced digital signal by a delay time used in the dropout compensation, and a comparator circuit for comparing the reproduced digital signal delayed by said delay circuit with the reproduced digital signal before being delayed.
Claim 4
Dependent Claim
24 words
A system according to claim 2, wherein said delay time is substantially equal to one horizontal scanning total line time in a television signal.
Claim 5
Dependent Claim
115 words
A PCM recording/reproducing system in which a plurality of digital words delay-interleaved and a cyclic redundancy check code formed on the basis of the digital words are recorded on a recording medium in one data block, the data block is reproduced through a dropout compensation circuit, and the digital words reproduced are delay-deinterleaved, said system comprising: dropout compensation detecting means for detecting whether a data block is dropout-compensated or not on the basis of one data word in the reproduced data block; and means responsive to said dropout compensation detecting means to add an error pointer signal to the remaining data words within said data block when said data word is detected as being dropout-compensated.
Claim 6
Dependent Claim
115 words
A PCM recording/reproducing system in which a plurality of digital words delay-interleaved and a cyclic redundancy check code formed on the basis of the digital words are recorded on a recording medium in one data block, the data block is reproduced through a dropout compensation circuit, and the digital words reproduced are delay-deinterleaved, said system comprising: dropout compensation detecting means for detecting whether a data block is dropout-compensated or not on the basis of one data word in the reproduced data block; and means responsive to said dropout compensation detecting means to add an error pointer signal to the remaining data words within said data block when said data word is detected as being dropout-compensated.
References Cited (Backward Citations)
US4146099A
Cited
US4277807A
Cited
US4224642A
Cited
US4227221A
Cited
US4281355A
Cited
US4238852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |