Elay line for video reproducer and/or recorder time base error correction system including electronically variable d

Claim 2

A circuit for correcting time base errors appearing in the output of a video tape reproducing device, which output is adapted to be applied in a video signal path to a television receiver readout, said circuit comprising: a surface wave dispersive delay line inserted in said path, means for deriving a signal which is a measure of said errors, and means for utilizing said signal to vary the frequency of the video signals traversing said delay line, thereby to correct said errors.

Claim 3

A circuit for correcting time base errors appearing in the output of a video tape reproducing device, which output is adapted to be applied in a video signal path to a television receiver readout having a horizontal scanning system, said circuit comprising: means for stripping horizontal synchronizing signals from the output of said reproducing device, a local oscillator for producing pulse signals, phase detecting means adapted to have applied thereto the stripped horizontal synchronizing signals and the pulse signal output of said local oscillator to produce a resultant analog error signal, means interposed between said phase detecting means and said local oscillator for filtering said analog error signal and applying it to said local oscillator, the ensemble of said local oscillator and said detecting means and said filtering means simulating in parameters and operation the automatic frequency control portion of the horizontal scanning system of said television receiver readout, variable delay means in said video signal path, said delay means being a surface wave dispersive delay line in which the magnitude of the delay depends on the frequency of the carrier signals passing therethrough, and means controlled by said analog error signal for varying said frequency.

Claim 4

A circuit for correcting time base errors appearing in the output of a video tape reproducing device, which output is adapted to be applied in a video signal path to a television receiver readout having a horizontal scanning system, said circuit comprising: means for stripping horizontal synchronizing signals from the output of said reproducing device, a local oscillator for producing pulse signals, phase detecting means adapted to have applied thereto the stripped horizontal synchronizing signals and the pulse signal output of said local oscillator to produce a resultant analog error signal, means interposed between said phase detecting means and said local oscillator for filtering said analog error signal and applying it to said local oscillator, the ensemble of said local oscillator and said detecting means and said filtering means simulating in parameters and operation the automatic frequency control portion of the horizontal scanning system of said television receiver readout, variable delay means in said video signal path, said delay means being a surface wave dispersive delay line in which the magnitude of the delay depends on the frequency of the carrier signals passing therethrough, and means controlled by said analog error signal for varying said frequency.

Claim 5

The combination in accordance with claim 2 in which the last-mentioned means comprises: a modulator intercoupled between the video tape reproducing device and the surface wave dispersive delay line, a demodulator intercoupling the delay line and said television receiver readout, and a second oscillator of the voltage controlled type, having an input coupled to the filtering means and outputs coupled to the modulator and demodulator, for elevating the frequency of the video signals passing through the delay line and depressing the frequency of the video signals departing from the delay line.