Method and arrangement for sound track recording in which background music is damped during speech signals

Claim 2

Method for recording dominant and background sound signals on a sound track, comprising, in combination, the steps of first recording said dominant sound signals on predetermined portions of said sound track, in such a manner that said sound track has at least a first and second portion with recorded dominant sound signals separated by at least one further predetermined portion having no recorded signals; subsequently furnishing said background sound signals substantially continuously; converting said so-furnished background sound signals into corresponding electrical signals; scanning said sound track during said furnishing of said background sound signals and following said recording of said dominant sound signals in such a manner that each portion of said sound track is scanned a predetermined time interval prior to the recording on said portion of said electrical signals; furnishing sensed dominant sound signals in response to so-scanned recorded dominant sound signals; decreasing the amplitude of said electrical signals in response to said sensed dominant sound signals, while maintaining the amplitude of said electrical signals in the absence of said sensed dominant sound signals; and continuously recording said electrical signals, whereby said background sound siGnals are damped for portions of said sound track having recorded dominant sound signals.

Claim 3

Arrangement for recording background sound signals on a sound track having predetermined portions with dominant sound signals recorded thereon and further predetermined portions having no signals recorded thereon, comprising, in combination, transport means transporting said sound track along a predetermined path past a first location and a second location following said first location in the direction of movement of said sound track; sensing means located at said first location in operative proximity to said sound track for furnishing electrical sensed dominant sound signals in response to said recorded dominant sound signals; means for furnishing background sound signals and transducing said background sound signals into corresponding electrical background signals; damping circuit means for decreasing the amplitude of said electrical background signals upon activation; activating means for activating said damping circuit means in response to said sensed dominant sound signals and for deactivating said damping circuit means in the absence of said sensed dominant sound signals, whereby said damping circuit means furnish damping output signals corresponding to said background sound signals, but having an amplitude varying in dependence upon the absence and presence of said sensed dominant sound signals; and recording means located at said second location for continuously recording said damping output signals on said sound track.

Claim 4

Arrangement for recording background sound signals on a sound track having predetermined portions with dominant sound signals recorded thereon and further predetermined portions having no signals recorded thereon, comprising, in combination, transport means transporting said sound track along a predetermined path past a first location and a second location following said first location in the direction of movement of said sound track; sensing means located at said first location in operative proximity to said sound track for furnishing electrical sensed dominant sound signals in response to said recorded dominant sound signals; means for furnishing background sound signals and transducing said background sound signals into corresponding electrical background signals; damping circuit means for decreasing the amplitude of said electrical background signals upon activation; activating means for activating said damping circuit means in response to said sensed dominant sound signals and for deactivating said damping circuit means in the absence of said sensed dominant sound signals, whereby said damping circuit means furnish damping output signals corresponding to said background sound signals, but having an amplitude varying in dependence upon the absence and presence of said sensed dominant sound signals; and recording means located at said second location for continuously recording said damping output signals on said sound track.

Claim 5

An arrangement as set forth in claim 2, wherein said sound track has a determined length between said first and second locations; and wherein each portion of said sound track having recorded dominant sound signals exceeds in length said determined length.

Claim 6

An arrangement as set forth in claim 2, wherein said activating means comprise a transistor.

Claim 7

An arrangement as set forth in claim 2, wherein said activating means comprise a field-effect transistor.

Claim 8

An arrangement as set forth in claim 2, wherein said activating means comprise switching means having a first state in the presence of said electrical sensed dominant sound signals and a second state in the absence of sensed dominant sound signals.

Claim 9

An arrangement as set forth in claim 6, wherein said recording means comprise a recording head having a coil; and wherein said damping circuit means comprise a field-effect transistor having a drain-source circuit series connected with said coil, and a gate; and timing circuit means interconnecting said gate and said switching means.

Claim 10

An arrangement as set forth in claim 7, wherein said switching means comprise a relay having relay contacts connected to said timing circuit means.

Claim 11

An arrangement as set forth in claim 8, wherein said transport means transports said sound track along said predetermined path at a velocity whereat a determined time interval is required for a given point on said sound track to travel from said first location to said second location; and wherein said relay has a drop-out time at least equal to said determined time interval.

Claim 12

An arrangement as set forth in claim 8, wherein said field-effect transistor is in a conductive condition when said switching means is in said second state.

Claim 13

An arrangement as set forth in claim 10, wherein said timing circuit means comprises a capacitor having a charging time and a discharged time; wherein said transport means transports said sound track along said predetermined path at a velocity whereat a given point on said sound track requires a determined time interval to travel from said first location to said second location; and wherein said determined time interval is less than or equal to said charging and discharge time.