High speed tape duplicating equipment
First Claim
1. A system for duplicating pre-recorded audio material on magnetic tape, the pre-recorded material having a plurality of discrete channels of information, comprising,(a) means for supplying audio source signals from the pre-recorded material in a digital form, said digital source signals including at least one of the channels of information,(b) means for identifying portions of said digital source signals with the channel of said digital source signals,(c) means for making at least one master library recording from said digital source signals, said master library recording containing at least one of the channels of information from the pre-recorded material,(d) means for generating digital master library signals from said master library recording by playing back at least a portion of said master library recording,(e) means for electronically storing said digital master library signals,(f) means for repeatedly reading said stored signals in either a forward or reverse direction, and(g) duplicating means for making a plurality of duplicate recordings as said stored signals are read out by said reading means, without requiring any further playback of said master library recording while said stored digital signals remain in said storing means,whereby at least a portion of said stored signals may be simultaneously read out and duplicated in a forward direction on said duplicate recordings while other of said stored signals are read out and duplicated in a reverse direction on the same recording.
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Accused Products
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.
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Citations
50 Claims
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1. A system for duplicating pre-recorded audio material on magnetic tape, the pre-recorded material having a plurality of discrete channels of information, comprising,
(a) means for supplying audio source signals from the pre-recorded material in a digital form, said digital source signals including at least one of the channels of information, (b) means for identifying portions of said digital source signals with the channel of said digital source signals, (c) means for making at least one master library recording from said digital source signals, said master library recording containing at least one of the channels of information from the pre-recorded material, (d) means for generating digital master library signals from said master library recording by playing back at least a portion of said master library recording, (e) means for electronically storing said digital master library signals, (f) means for repeatedly reading said stored signals in either a forward or reverse direction, and (g) duplicating means for making a plurality of duplicate recordings as said stored signals are read out by said reading means, without requiring any further playback of said master library recording while said stored digital signals remain in said storing means, whereby at least a portion of said stored signals may be simultaneously read out and duplicated in a forward direction on said duplicate recordings while other of said stored signals are read out and duplicated in a reverse direction on the same recording.
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12. A system for duplicating pre-recorded material on magnetic tape comprising,
(a) means for supplying source signals from the pre-recorded material at a first rate, (b) means for recording at least a portion of said source signals on a master library medium at said first rate, (c) means for generating digital signals from said master library medium by playing back at least a portion of said master library medium at a second rate, said second rate being higher than said first rate, (d) means for electronically storing said digital signals from said master library medium, and (e) means for making a plurality of duplicate recordings from said stored digital signals at a third rate, said third rate being higher than said second rate.
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22. A system for creating a master library recording from previously recorded signals which allows for a master library recording to be created which eliminates restraining parameters when transferring source material to a duplicator comprising,
(a) means for supplying digitized source signals which were originally recorded from audio information, (b) means for converting said digitized signals to parallel for storage in a large scale electronic storage device, (c) means for electronically storing said signals in said storage device, (d) means for retrieving said electronically stored signals, and (e) means for recording said retrieved signals on a master library recording, whereby a mater library recording containing audio information in a digital form can be made from digitized signals, which will allow the transfer of an audio program to a duplicating device without the limitation of transferring data in a serial form or other restraining parameters.
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50. A duplicating recorder/reproducer system for duplicating pre-recorded material on magnetic tape comprising,
(a) means for supplying audio source signals corresponding to the pre-recorded material, (b) means for making at least one master library recording which includes said audio source signals, the master library recording also containing at least one duplicate copy of said audio source signals, (c) means for comparing duplicate blocks of data stored on said master library recording for detecting errors between said audio source signals and said copy of said audio source signals, (d) means for generating master library signals from said master library recording by playing back at least a portion of said master library recording, (e) storage means responsive to said playback of at least a portion of said master library recording for electronically storing selected signals from said master library recording, and (f) duplicating means responsive to said electronically stored master library signals for making a plurality of duplicate recordings without requiring any further playback of said master library recordings while said signals remain in said storage means, whereby errors on said master library recording can be detected prior to storing electronically for making a plurality of duplicate recordings.
Specification