US 4,290,081 AGranted

Method and apparatus for stop frame reproduction in television picture fields each recorded on tape in a plurality of adjacent tracks

AssigneeRobert Bosch GmbH

InventorHubert Foerster

Life of this patent

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Abstract

Successive picture fields in normal operation are successively written into a one-field memory and displayed by nondestructive read-out. A stop order stops the tape while the last recorded picture field is continuously displayed and backs up the tape to a point from which it can be restarted to store either the next preceding or the next following picture field, according to the next order entered into the equipment. An address memory is supplied with addresses read off the tape by a counter roller and a timing mark reading head. A stop order interrupts the advancing of the address in storage by the tape advance reading head, causing the tape to be stopped and backed up at the end of memorizing the picture field being reproduced. A forward step or backward step order increments or decrements the address memory and restarts the tape, and when the addressed picture field is reproduced, it is stored in the memory, after which the usual stop and back-up automatically takes place. An order for resumption of progressive television picture reproduction can also be supplied to the system.

Claims6

Dependent claims

A method of reproducing individual pictures selected by stepwise inspection of a sequence of television picture fields from tape-recorded television signals having picture field addresses corresponding to position on the tape, for critical examination of events recorded in said sequence of fields, comprising the steps of:

storing in an address storage memory the address of a picture field to be repetitively reproduced;
establishing normal pick-up of tape-recorded television signals while keeping track of the positions on the tape of the picture fields successively picked-up;
writing in the signals corresponding to said picture field to be repetitively reproduced into a picture storage memory during normal television signal pick-up of said tape-recorded signals in response to the detection of the tape position corresponding to said stored address;
repetitively reading out nondestructively the signals so stored in said memory;
stopping and reversing the tape movement in response to completion of the writing of said signals corresponding to said picture field into said memory and then automatically stopping the tape again after backing it up to a point from which it can obtain sufficient velocity upon renewed forward movement to pick up and store in said memory a picture field which precedes, by a first predetermined number of picture fields, the picture field last written into said memory, and, concurrently with reversing the tape movement and stopping it again, modifying the address storage memory to store the address of a picture field preceding or succeeding, selectedly, by said first predetermined number of picture fields, the picture field stored by said corresponding signals in said picture storage memory, the extent of said backing up being determined by a second predetermined number of picture fields exceeding said first predetermined number of picture fields.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/026,335Filed 2 Apr 1979 · continuation
Priority: DE 26457479 Oct 1976
Granted: 15 Sep 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04N 5/937
Regeneration of the television signal or of selected parts thereof: by assembling picture element blocks in an intermediate store
G11B 15/005
Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record…:…
G11B 27/107
Programmed access in sequence to addressed parts of tracks of operating record carriers: of operating tapes
G11B 27/32
By using information signals recorded by the same method as the main recording: on separate auxiliary tracks of the same or an auxiliary record…