Loading patent…
AssigneeRobert Bosch GmbH
InventorWinfried Horstmann
Estimating the term…
Time base errors arising during the playback of a broadband signal previously stored in segments in a plurality of narrow-band channels with a first time transformation are corrected. Specifically, these signals are read out in turn from the narrow channels on the tape and applied at a slow rate to a plurality of buffer storages. They are read out from the buffer storages at a relatively fast rate, in sequence, so that the broadband signal is reconstituted. The broadband signal is then demodulated. For time base correction, the horizontal synchronization signals are separated from the reconstituted demodulated signal and their timing is compared to the timing of horizontal reference signals. A pulse is formed whose pulse width is equal to the time interval between occurrence of a horizontal synchronization pulse separated from the demodulated signal and the occurrence of the corresponding reference synchronization signal. The output of the clock generator controlling the readout from the buffer storages is delayed by a time interval equal to the pulse width. Further measures for decreasing residual errors are also specified. The measurement is carried on at the start of each line and after the signal has been reconstituted and demodulated and is thus present in a single channel.
In a method for reconstituting a television signal by readout at a predetermined readout rate for time transformation of individual segments of said signal stored after pickup from a record medium in a plurality of stores as received respectively from a plurality of narrow-band channels at a recording rate lower than said readout rate, said segments having been recorded on said medium after a time transformation reciprocal to said first-mentioned time transformation:
In a system for reconstituting a television signal comprising multichannel means for picking up television signals from a plurality of channels of a recording medium, multichannel storage means for storing segments of television signals respectively picked up by said pickup means from an equivalent plurality of record channels, means for transferring television signal segments from said pickup channels to said storage channels at a first predetermined rate, readout means including readout clock means operating at a second predetermined rate faster than said first predetermined rate for sequentially reading out signals from said channels of said storage means and for combining them in segment sequence into a reconstituted television signal, apparatus for correcting time base errors in the so reconstituted television signals comprising:
Dependencies are inferred from the claim text.