Methods and arrangements for changing the audio information in an audio/video recording/reproduction system

Claim 3

A method as claimed in claim 1, wherein the changing of the audio signal is effected in the reproduction mode of operation of the recording/reproduction system by a short time switching-over to recording mode, during which time the overwriting is carried out.

Claim 4

A method as claimed in claim 1, wherein the switching-over into recording mode is controlled by means of synchronizing pulses of the reproduced video signal.

Claim 5

A method as claimed in claim 1, wherein the original audio signal is in the form of a pulse-amplitude modulation signal.

Claim 6

A method as claimed in claim 1, wherein the original audio signal is in the form of a pulse-phase modulation signal.

Claim 7

A method as claimed in claim 1, wherein the original audio signal is in the form of a pulse-width modulation signal.

Claim 8

A method as claimed in claim 1, wherein the original audio signal is in the form of a pulse-code modulation signal.

Claim 11

A method as claimed in claim 8, wherein the duration of the horizontal synchronizing signal is shortened during recording and extended again to its original duration during reproduction.

Claim 12

An arrangement for changing the audio information in an audio/video recording/reproduction system in which the audio signals are inserted in the form of sampling pulses of a time-multiplex system into a horizontal blanking interval of the video signal and which comprises a recording channel having audio and video signal inputs and a reproduction channel having audio and video signal outputs and which further comprises in the recording channel at least one synchronizing signal separator and one FM modulator, wherein switches are connected between the audio and video signal inputs and the FM modulator and timing elements are arranged between said at least one synchronizing signal separator and the switches and the FM modulator for the insertion of the audio signal at the correct time into the horizontal blanking interval of the video signal and wherein there are also provided a burst separator circuit for, during recording, separating the color burst from the back porch of the synchronizing signal and a burst generator circuit for producing a new color burst for insertion into the bottom of the synchronizing circuit and wherein during reproduction said burst separator and burst generator circuits separate, regenerate and replace the color burst on said back porch of the synchronizing signal.

Claim 13

An arrangement for changing the audio information in an audio/video recording/reproduction system in which the audio signals are inserted in the form of sampling pulses of a time-multiplex system into a horizontal blanking interval of the video signal and which comprises a recording channel having audio and video signal inputs and a reproduction channel having audio and video signal outputs and which further comprises in the recording channel at least one synchronizing signal separator and one FM modulator, wherein switches are connected between the audio and video signal inputs and the FM modulator and timing elements are arranged between said at least one synchronizing signal separator and the switches and the FM modulator for the insertion of the audio signal at the correct time into the horizontal blanking interval of the video signal and wherein there are also provided a burst separator circuit for, during recording, separating the color burst from the back porch of the synchronizing signal and a burst generator circuit for producing a new color burst for insertion into the bottom of the synchronizing circuit and wherein during reproduction said burst separator and burst generator circuits separate, regenerate and replace the color burst on said back porch of the synchronizing signal.

Claim 14

An arrangement as claimed in claim 10, wherein further an FM demodulator and a synchronizing signal separator are provided in the reproduction channel, and between the FM demodulator and the audio and video signal outputs switches are provided, and between the synchronizing signal separator and the switches timing elements are connected for time-controlling the switching operation of the switches in the reproduction mode of the recording/reproduction system.

Claim 15

An arrangement as claimed in claim 11, wherein, if the video signal is a color video signal, circuits are provided for detecting the color burst signal on the back porch of the horizontal blanking interval and for displacing, during recording, the color burst signal into the bottom of the synchronizing signal, and a circuit is also provided for replacing, during reproduction, the color burst signal into its original position on said back porch of the horizontal blanking interval.

Claim 16

An arrangement as claimed in claim 10, wherein between the recording and reproduction channels a recording/reproduction switch is provided which is also time-controlled by said timing elements.

Claim 17

An arrangement as claimed in claim 10, wherein the duration and the position in time of the sampling pulses are controlled by said timing elements.

Claim 18

An arrangement as claimed in claim 10, wherein during dubbing the switches in the recording and reproduction channels and the recording/reproduction switch are time-controlled by the synchronizing signal separator in the reproduction channel via the timing elements.