EP0363152A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
High speed tape duplicating machine
Assignee: Duplitronics Inc
•
Filing: 1989-10-03
•
Granted: —
•
Expires: 2009-10-03
Abstract
Abstract A duplicate recording system uses video cassettes for storing master library recordings. On both the recording and the duplicating ends of the system, all signals are buffer stored in an electronic memory while the signals are in a digital form. This buffer storage completely isolates the recording/reproducing steps so that the usual parameter of restraints disappear. For example, the duplication ratio may be any value within the capabilities of the recording/reproducing machines. This isolation eliminates expensive setup procedures heretofore required to switch from one to another duplicating ratio. The buffer storage also provides a more precise transfer with greater fidelity of the recorded signals. A computer calculates a smoother analog curve when the digital-to-analog conversion is made.
Inventors
- 👤 Robert G. Scheffler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:35
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/002; G11B27/005; G11B27/02; G11B27/022; G11B27/028; G11B27/031; G11B5/00; G11B5/86; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2545; G11B2220/40; G11B2220/41; G11B2220/60; G11B2220/61; G11B2220/90; G11B2220/91; G11B2220/913; G11B27/024
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
127 words
(1) A duplicating recorder/reproducer system comprising means for supplying source signals in a digital form, means responsive to said digital source signals for electronically storing said digital source signals, means responsive to said electronically stored source signals for making a master library recording of said digital signals, means responsive to a playback of said master library recording for electronically storing the digital signals played back from said master library recording, and means responsive to said electronically stored master library signals played back from said master recording for making duplicate recordings, whereby a plurality of duplicate recordings may be made from signals in said electronic storage without requiring any moving parts or any further playback of said master library recording while said signals remain in said electronic storage.
Claim 2
Dependent Claim
32 words
The system of claim 1 wherein said means for making said master library recording comprises means for recording said digital signals in said electronically stored source signals on a video tape cassette.
Claim 3
Dependent Claim
115 words
The system of claim 2 wherein each of said electronic storage means comprises an array of large scale memory chips, each of said chips being capable of storing in the order of at least 111 Mbits of information, each of said chips having an input port and an output port, all of said input ports being connected in parallel and all of said output ports being connected in parallel, and means responsive to addresses transmitted into said array on an address bus common to all of said chips for selecting between said input ports and said output ports, whereby the entire array of memory chips behaves as a single and unitary large scale electronic memory.
Claim 4
Dependent Claim
26 words
The system of claim 3 wherein said means for supplying source signals comprises an analog-to-digital converter and a digital translator with switch means for selecting therebetween.
Claim 5
Dependent Claim
141 words
The system of claim 4 further comprising a time sequencing means for controlling said analog-to-digital converter, said sequencing means cyclically operating through the steps of: (a) converting said source signals into the form of successive data words; (b) latching a current source signal data word into a last data word latch circuit for use in connection with the next received source signal data word; (c) outputting a signal which is a combination of said current source signal data word and a stored last previous source signal data word; (d) continuously checking the signals to determine whether said source signals continue to be received by said analog-to-digital converter; and (e) resetting at least part of said analog-to-digital converter to an idle condition in response to a finding in step (d) that said source signals are not being received by said analog-to-digital converter.
Claim 6
Dependent Claim
38 words
The system of claim 5 wherein said time sequencing means introduces a delay between steps (b) and (c) which is long enough for said analog-to-digital converter to process said combination of said current and said last data words.
Claim 7
Dependent Claim
139 words
The system of claim 4 further comprising a timing sequencing means for controlling said analog-to-digital converter, said sequencing means cyclically operating through the steps of: (a) converting said source signals into the form of successive data words; (b) outputting a signal which is a combination of a current source signal data word and a stored last preceding data word; (c) latching said output signal into a last data word latch circuit for use with the next succeeding current source signal data word; (d) continuously checking the signals received in step (a) to determine whether said source signals continue to be received by said analog-to-digital converter; and (e) resetting at least part of said analog-to-digital converter to an idle condition in response to a finding in step (d) that said source signals are not being received by said analog-to-digital converter.
Claim 8
Dependent Claim
60 words
The system of claim 1 and digital-do-analog converter means responsive to said electronically stored play back signals for supplying analog signals to said means for making duplicate recordings, said digital-to-analog converter means including means for representing an analog signal by mathematically calculating a plurality of additional analog signals for each digital signal that is played back from said master recording.
Claim 9
Dependent Claim
33 words
The system of claim 8 wherein said calculated signals are calculated on a basis of moving an analog signal from one to the next digital signals in a plurality of equal incremental steps.
Claim 10
Independent Claim
74 words
A system for mastering a library tape in response to a source signal, said system comprising analog-to-digital means for digitizing an analog signal, means for electronically buffer storing said digitized signal, and means responsive to said signals stored in said buffer storage for recording said digitized signal, whereby said electronic buffer storage isolates said source signal from said recorded signal for eliminating restraining parameters on the transfer or source signals into a master recording.
Claim 11
Dependent Claim
35 words
The system of claim 10 wherein one of said parameters includes the duplication ratio, and means for operating said recording means at different duplication ratios without requiring a setup procedure to change the duplication ratio.
Claim 12
Dependent Claim
79 words
The system of claim 11 wherein said buffer storing means comprises a plurality of memory chips each having an input port and an output port, means for connecting all of said input ports in parallel, means for connecting all of said output ports in parallel, and means for storing successive digital signals at addresses indicated on a bus which is common to all of said memory chips whereby said memory chips operate as a single large, unitary memory chip.
Claim 13
Dependent Claim
15 words
The system of claim 12 wherein said recording means is a video tape cassette recorder.
Claim 14
Dependent Claim
50 words
The system of claim 13 and means responsive to a playback of said video cassette recorder tape for electronically buffer storing the signals which are played back, and means for duplicate recording said electronically buffer stored signals whereby said buffer storage isolates the video cassette playback from the duplicate recording.
Claim 15
Dependent Claim
50 words
The system of claim 14 and digital-to-analog converter means interposed between said electronic buffer storage means and said duplicate recording means, means in said digital-to-analog converter means for calculating an analog curve which gradually changes digital sample signals represented by said buffer-stored digital signals into a relatively smooth analog curve.
Claim 16
Dependent Claim
48 words
A duplicating recording machsine comprising means for providing source signals in digital form, means for electronically buffer storing said digital source signals, and means responsive to said buffer stored digital signals for making duplicate recording of analog signals whereby said source signals ae isolated from said recorded signals.
Claim 17
Dependent Claim
21 words
The recording machine of claim 16 and digital-to-analog converter means interposed between said buffer storage means and said duplicate recording means.
Claim 18
Dependent Claim
23 words
The recording machine of claim 17 wherein said digital-to-analog converter comprises means for calculating a substantially smooth curve envelope for said digital signals.
Claim 19
Dependent Claim
39 words
The recording machine of claim 17 wherein said digital-to-analog converter comprises means for dividing the difference between successive digital samples into N-steps, and means for adding one of said steps to each of N-samples between said successive digital samples.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.