US5113397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus relating to the reproduction of error encoded digitally recorded signals
Assignee: Deutsche Thomson Brandt GmbH
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Filing: 1990-02-02
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Granted: 1992-05-12
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Expires: 2010-02-02
Abstract
Abstract A digital signal, such as obtained during playback from a DAT machine, includes a first component containing e.g. the audio content and a second component containing error recognition code. A signal processor derives in accordance with the second component an error signal representative of errors in the digital signal. A microcomputer then calculates an error rate signal. The error rate signal may be visually displayed or the error rate signal may be applied to the pre-amplifier circuits in the playback transducer stage to minimize the errors.
Inventors
- 👤 Jurgen Kaaden
- 👤 Dietmar Uhde
- 👤 Franz Bigge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B20/00; G11B20/10; G11B20/10527; G11B20/18; G11B27/00; G11B27/10; G11B27/34; G11B27/36; G11B33/00; G11B33/10; G11B2220/00; G11B2220/90; G11B2220/91; G11B2220/913
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
150 words
Apparatus comprising: a plurality of transducer channels, each having a playback output, defining a source of a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one gain adjustable signal amplifier stage for adjusting at least one of said playback outputs to equalize playback between said plurality of transducer channels; a signal processor coupled to said source for deriving in accordance with said second component an error signal representative of said errors; means responsive to said error signal for generating an error rate signal representative of the rate of occurrence of said errors; means for controlling said adjustable signal amplifier stage responsive to said error rate signal; and, means responsive to said error rate signal for displaying said error rate.
Claim 2
Dependent Claim
150 words
Apparatus comprising: a plurality of transducer channels, each having a playback output, defining a source of a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one gain adjustable signal amplifier stage for adjusting at least one of said playback outputs to equalize playback between said plurality of transducer channels; a signal processor coupled to said source for deriving in accordance with said second component an error signal representative of said errors; means responsive to said error signal for generating an error rate signal representative of the rate of occurrence of said errors; means for controlling said adjustable signal amplifier stage responsive to said error rate signal; and, means responsive to said error rate signal for displaying said error rate.
Claim 3
Dependent Claim
15 words
Apparatus according to claim 1 wherein said error rate signal generating means comprises a microcomputer.
Claim 4
Dependent Claim
16 words
Apparatus according to claim 1 further comprising a switch for activating said error rate displaying means.
Claim 5
Dependent Claim
20 words
Apparatus according to claim 1 including means for generating a signal activation code for activating said error rate displaying means.
Claim 6
Dependent Claim
32 words
Apparatus according to claim 1 wherein said error signal responsive means establishes a threshold value for said error rate for automatically activating said error rate displaying means upon exceeding said threshold value.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 1 wherein said signal amplifier stage individually controls each of the plurality of channels.
Claim 8
Dependent Claim
14 words
Apparatus according to claim 1 wherein adjustment of equalization is performed continually during playback.
Claim 9
Dependent Claim
12 words
Apparatus according to claim 1 wherein adjustment of equalization is performed aperiodically.
Claim 10
Dependent Claim
24 words
Apparatus according to claim 1 wherein adjustment of equalization is performed in response to changeover from one to another one of said recorded medium.
Claim 11
Dependent Claim
109 words
Apparatus comprising: a transducer stage having a plurality of transducing channels with respective playback outputs, for developing a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one gain adjustable signal amplifier stage for adjusting playback equalization between said plurality of transducer channels; a signal processor coupled to said transducer stage for deriving in accordance with said second component an error signal representative of said errors; and, means for controlling said adjustable signal amplifier responsive to said error signal.
Claim 12
Dependent Claim
109 words
Apparatus comprising: a transducer stage having a plurality of transducing channels with respective playback outputs, for developing a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one gain adjustable signal amplifier stage for adjusting playback equalization between said plurality of transducer channels; a signal processor coupled to said transducer stage for deriving in accordance with said second component an error signal representative of said errors; and, means for controlling said adjustable signal amplifier responsive to said error signal.
Claim 13
Dependent Claim
18 words
Apparatus according to claim 10 wherein said signal amplifier stage individually controls each of the plurality of channels.
Claim 14
Dependent Claim
14 words
Apparatus according to claim 10 wherein adjustment of equalization is performed continually during playback.
Claim 15
Dependent Claim
12 words
Apparatus according to claim 10 wherein adjustment of equalization is performed aperiodically.
Claim 16
Dependent Claim
24 words
Apparatus according to claim 13 wherein adjustment of equalization is performed in response to changeover from one to another one of said recorded medium.
Claim 17
Dependent Claim
111 words
Apparatus comprising: a plurality of transducer channels, each having a playback output, defining a source of a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one adjustable signal amplifier stage including a negative feedback circuit for adjusting playback equalization between said plurality of transducer channels; a signal processor coupled to said source for deriving in accordance with said second component an error signal representative of said errors; and, means for adjusting said negative feedback circuit responsive to said error signal.
Claim 18
Dependent Claim
111 words
Apparatus comprising: a plurality of transducer channels, each having a playback output, defining a source of a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one adjustable signal amplifier stage including a negative feedback circuit for adjusting playback equalization between said plurality of transducer channels; a signal processor coupled to said source for deriving in accordance with said second component an error signal representative of said errors; and, means for adjusting said negative feedback circuit responsive to said error signal.
Claim 19
Dependent Claim
19 words
Apparatus according to claim 15 wherein said feedback adjusting means includes an adjustable impedance responsive to said error signal.
Claim 20
Dependent Claim
150 words
Apparatus comprising: a plurality of transducer channels having respective playback outputs and defining a source of a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one adjustable signal amplifier stage including a negative feedback circuit; a signal processor coupled to said source for deriving in accordance with said second component an error signal representative of said errors; means responsive to said error signal for generating an error rate signal representative of the rate of occurrence of said errors; means for controlling said negative feed back circuit responsive to said error rate signal for adjusting playback equalization between said plurality of transducer channels; and, means responsive to said error rate signal for providing a visual display of said error rate.
Claim 21
Dependent Claim
150 words
Apparatus comprising: a plurality of transducer channels having respective playback outputs and defining a source of a digital signal during playback from a recorded medium, said signal including a first component relating to information content in said signal and a second component providing error code information relating to errors introduced into said information content; at least one adjustable signal amplifier stage including a negative feedback circuit; a signal processor coupled to said source for deriving in accordance with said second component an error signal representative of said errors; means responsive to said error signal for generating an error rate signal representative of the rate of occurrence of said errors; means for controlling said negative feed back circuit responsive to said error rate signal for adjusting playback equalization between said plurality of transducer channels; and, means responsive to said error rate signal for providing a visual display of said error rate.
Claim 22
Dependent Claim
19 words
Apparatus according to claim 17 wherein said feedback adjusting means includes an adjustable impedance responsive to said error 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) | 1995-05-12 | 1995-11-11 | 1996-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-12 | 1999-11-11 | 2000-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-12 | 2003-11-11 | 2004-05-12 | $7700.00 | Window Closed / Lapsed |