EP0084969A1 — Method of and apparatus for reproducing an inform…

Claim 1

Independent Claim 255 words

Apparatus for reproducing an information signal recorded in a plurality of successive parallel tracks on a record medium and comprised of a video signal and an audio signal, comprising a transducer device for scanning said tracks to reproduce said information signal recorded in said plurality of successive parallel tracks and an output; characterized in that said audio signal is at least one of a frequency-modulated audio signal (S e ) and a digitized audio signal (S u ), with the video signal (S f , S s ) and frequency-modulated audio signal (S e ) being recorded only in a main section of each track and the digitized audio signal (S u ) being recorded only in an overscan section of each track; and characterized by a separation device (64A, 64B) for separating said information signal (S t ) reproduced during scanning of the main section of each track by said transducer device (28A, 28B) and a signal reproduced during scanning of the overscan section of each track by said transducer device (28A, 28B), a detector (62, 100) for detecting whether said separated signal reproduced during scanning of said overscan section of each track includes a digitized audio signal (S u ) and producing a detection signal (S d ) in response thereto, and a switch device (92) for switching an audio signal (S ) corresponding to one of the digitized audio signal (S ) and frequency-modulated audio signal (S ) to the output (102, 104) in response to the detection signal (S d ).

Claim 2

Dependent Claim 255 words

Apparatus for reproducing an information signal recorded in a plurality of successive parallel tracks on a record medium and comprised of a video signal and an audio signal, comprising a transducer device for scanning said tracks to reproduce said information signal recorded in said plurality of successive parallel tracks and an output; characterized in that said audio signal is at least one of a frequency-modulated audio signal (S e ) and a digitized audio signal (S u ), with the video signal (S f , S s ) and frequency-modulated audio signal (S e ) being recorded only in a main section of each track and the digitized audio signal (S u ) being recorded only in an overscan section of each track; and characterized by a separation device (64A, 64B) for separating said information signal (S t ) reproduced during scanning of the main section of each track by said transducer device (28A, 28B) and a signal reproduced during scanning of the overscan section of each track by said transducer device (28A, 28B), a detector (62, 100) for detecting whether said separated signal reproduced during scanning of said overscan section of each track includes a digitized audio signal (S u ) and producing a detection signal (S d ) in response thereto, and a switch device (92) for switching an audio signal (S ) corresponding to one of the digitized audio signal (S ) and frequency-modulated audio signal (S ) to the output (102, 104) in response to the detection signal (S d ).

Claim 3

Dependent Claim 109 words

Apparatus according to Claim 1; in which said video signal includes a vertical synchronizing signal; and further characterized in that said detector (62, 100) includes a control signal generator (62) for producing a gate signal (P ) in synchronism with said vertical synchronizing signal (P v ), and a digital detector (100) for detecting whether said separated signal reproduced during scanning of said overscan section of each track includes a digitized audio signal (S u ), in response to said gate signal (P ) and said separated signal reproduced during scanning of said overscan section of each track, and producing said detection signal (S d ) in response thereto.

Claim 4

Dependent Claim 64 words

Apparatus according to Claim 2; further characterized in that said separated signal reproduced during scanning of the overscan section of each track includes a run-in signal (RI) when said separated signal includes said digitized audio signal (S u ), and said digital detector (100) produces said detection signal (S d ) in response to said gate signal (P ) and said run-in signal (RI).

Claim 5

Dependent Claim 108 words

Apparatus according to Claim 3; further characterized by a frequency-demodulation circuit (90) for frequency-demodulating a frequency-modulated audio signal (S e ) reproduced during scanning of the main section of each track to produce a first analog audio signal (Sa), and a digital processor (96, 98) for processing a digitized audio signal (S u ) reproduced during scanning of the overscan section of each track to produce a second analog audio signal (S a ); and further characterized in that said switch device (92) switches one of the first analog audio signal and the second analog audio signal to the output (102, 104) in response to said detection signal.

Claim 6

Dependent Claim 68 words

Apparatus according to Claim 2; further characterized in that said control signal generator (62) produces a switch control signal (5 ) for controlling said separation device (64A, 64B) to separate said information signal reproduced during scanning of the main section of each track by said transducer device (28A, 28B) and the signal reproduced during scanning of the overscan section of each track by said transducer device (28A, 28B).

Claim 7

Dependent Claim 128 words

Apparatus according to Claim 5; in which said transducer device includes first and second heads (28A, 28B) for scanning said tracks to reproduce said information signal recorded in said plurality of successive parallel tracks; and said separation device (64A, 64B) includes a first switch (64A) connected to said first and second heads (28A, 28B) and controlled by said switch control signal (S ) to separate said information signal reproduced during scanning of the main section of each track by said first and second heads, and a second switch (64B) connected to said first and second heads (28A, 28B) and controlled by said switch control signal (S w ) to separate said signal reproduced during scanning of the overscan section of each track by said first and second heads.

Claim 8

Independent Claim 208 words

A method of reproducing an information signal recorded in a plurality of successive parallel tracks on a record medium and comprised of a video signal and an audio signal and comprising the step of scanning said tracks to reproduce said information signal recorded in said plurality of successive parallel tracks; and characterized in that said audio signal is one of a frequency-modulated audio signal and a digitized audio signal, with the video signal and frequency-modulated audio signal being recorded only in a main section of each track and the digitized audio signal being recorded only in an overscan section of each track; and characterized by the steps of separating said information signal reproduced during scanning of the main section of each track and a signal reproduced during scanning of the overscan section of each track; detecting whether said separated signal reproduced during scanning of said overscan section of each track includes a digitized audio signal ( Su ); producing a detection signal (S d ) in response to said step of detecting; and switching an audio signal corresponding to one of said digitized audio signal (S ) and said frequency-modulated audio signal (S ) to an output (102, 104) in response to said detection signal (S d ).

Claim 9

Independent Claim 208 words

A method of reproducing an information signal recorded in a plurality of successive parallel tracks on a record medium and comprised of a video signal and an audio signal and comprising the step of scanning said tracks to reproduce said information signal recorded in said plurality of successive parallel tracks; and characterized in that said audio signal is one of a frequency-modulated audio signal and a digitized audio signal, with the video signal and frequency-modulated audio signal being recorded only in a main section of each track and the digitized audio signal being recorded only in an overscan section of each track; and characterized by the steps of separating said information signal reproduced during scanning of the main section of each track and a signal reproduced during scanning of the overscan section of each track; detecting whether said separated signal reproduced during scanning of said overscan section of each track includes a digitized audio signal ( Su ); producing a detection signal (S d ) in response to said step of detecting; and switching an audio signal corresponding to one of said digitized audio signal (S ) and said frequency-modulated audio signal (S ) to an output (102, 104) in response to said detection signal (S d ).

Claim 10

Dependent Claim 106 words

A method according to Claim 7; in which said video signal includes a vertical synchronizing signal; and further characterized in that said step of detecting includes the steps of producing a gate signal (P ) in synchronism with said vertical synchronizing signal (S v ), detecting whether said separated signal reproduced during scanning of the overscan section of each track includes a digitized audio signal (S u ), in response to said gate signal (P ) and said separated signal reproduced during scanning of the overscan section of each track, and producing said detection signal (S d ) in response to said latter step of detecting.

Claim 11

Dependent Claim 69 words

A method according to Claim 8; further characterized in that said separated signal reproduced during scanning of the overscan section of each track includes a run-in signal (RI) when said separated signal includes said digitized audio signal (S u ), and said step of producing includes the step of producing said detection signal (S d ) in response to said gate signal (P ) and said run-in signal (RI).

Claim 12

Dependent Claim 79 words

A method according to Claim 7; further characterized by the step of producing a switch control signal (S w ), and in that said step of separating includes the step of separating said information signal reproduced during scanning of the main section of each track by said transducer device (28A, 28B) and the signal reproduced during scanning of the overscan section of each track by said transducer device (28A, 28B) in response to said switch control signal (S ).

Method of and apparatus for reproducing an information signal

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