Signal processing circuit for magnetooptical record/reproducing apparatus

Claim 2

A signal processing circuit for use in a magnetooptical record/reproducing apparatus in which an erasing head and a recording head are so positioned, in their movement relative a magnetooptical recording medium on a same track thereof, that a point of said medium is passed at first by said erasing head and they by said recording head, comprising: a memory for storing an ID number of the start point of erasure; a first-in-first-out memory for storing the data to be recorded on said medium and releasing said data in the order of storage; and comparator means for comparing an ID number reproduced by said recording head with an ID number stored in said memory; wherein said signal processing circuit is adapted, in response to a coincidence signal from said comparator means in case of coincidence of said ID numbers, to send the data stored in said first-in-first-out memory to the recording head, thereby recording said data on said magnetooptical recording medium.

Claim 3

A signal processing circuit for use in a 2-beam optical record/reproducing apparatus in which a recording beam and a reproducing beam are so positioned that they move relative to an optical recording medium on a same track thereof, comprising: means for selecting a reproduced signal of the recording beam or a reproduced signal of the reproducing beam; and means for forming a signal corresponding to the reproduced signal of the recording beam when the reproduced signal of the reproducing beam is selected; wherein said signal processing circuit is adapted to immediately reproduce the newly recorded signal thereby confirming whether the signal is properly recorded.

Claim 4

A signal processing circuit for use in a 2-beam optical record/reproducing apparatus in which a recording beam and a reproducing beam are so positioned that they move relative to an optical recording medium on a same track thereof, comprising: means for selecting a reproduced signal of the recording beam or a reproduced signal of the reproducing beam; and means for forming a signal corresponding to the reproduced signal of the recording beam when the reproduced signal of the reproducing beam is selected; wherein said signal processing circuit is adapted to immediately reproduce the newly recorded signal thereby confirming whether the signal is properly recorded.

Claim 5

A signal processing circuit for use in a 3-beam optical record/reproducing apparatus in which an erasing beam, a recording beam and a reproducing beam are so positioned that they move relative to a 3-­beam recording medium on a same track thereof and that a point of said medium is passed at first by the erasing beam, then by the recording beam and at last by the reproducing beam, comprising: means for selecting a reproduced signal of the erasing beam or a reproduced signal of the reproduc­ing beam, said means comprising a first memory for storing the ID number of the start point of erasure; a second memory for storing the data to be recorded on said medium and releasing said data in the order of storage; and comparator means for comparing the ID number reproduced by said recording beam with the ID number stored in said first memory, and being adapted, in response to a coincidence signal from said comparator means, to send the data stored in said second memory to the recording beam thereby recording said data on said recording medium; and means for preparing a signal corresponding to the reproduced signal of the erasing beam when the reproduced signal of the reproducing beam is selected; wherein said signal processing circuit is adapted to immediately reproduce the newly recorded signal, thereby confirming whether the signal is properly recorded.

Claim 6

A signal processing circuit for use in a 3-beam optical record/reproducing apparatus in which an erasing beam, a recording beam and a reproducing beam are so positioned that they move relative to a 3-­beam recording medium on a same track thereof and that a point of said medium is passed at first by the erasing beam, then by the recording beam and at last by the reproducing beam, comprising: means for selecting a reproduced signal of the erasing beam or a reproduced signal of the reproduc­ing beam, said means comprising a first memory for storing the ID number of the start point of erasure; a second memory for storing the data to be recorded on said medium and releasing said data in the order of storage; and comparator means for comparing the ID number reproduced by said recording beam with the ID number stored in said first memory, and being adapted, in response to a coincidence signal from said comparator means, to send the data stored in said second memory to the recording beam thereby recording said data on said recording medium; and means for preparing a signal corresponding to the reproduced signal of the erasing beam when the reproduced signal of the reproducing beam is selected; wherein said signal processing circuit is adapted to immediately reproduce the newly recorded signal, thereby confirming whether the signal is properly recorded.

Claim 7

An optical record/reproduction apparatus, including a signal processing circuit having means responsive to a signal reproduced from a recording medium by an erase head for storing an identification number indicating the point on the recording medium at which an erased area commences, and means responsive to a signal reproduced from the recording medium by a record head for sensing identification numbers indicative of respective points on the recording medium, and for initiating the recording of a signal in response to sensing an identification number matching said stored identification number.

Claim 8

An optical record/reproduction apparatus, including a signal processing circuit having means responsive to a signal reproduced from a recording medium by an erase head for storing an identification number indicating the point on the recording medium at which an erased area commences, and means responsive to a signal reproduced from the recording medium by a record head for sensing identification numbers indicative of respective points on the recording medium, and for initiating the recording of a signal in response to sensing an identification number matching said stored identification number.

Claim 9

An optical record/reproduction apparatus, including a signal processing circuit having an input which can be switched between a record head, whereby the circuit can develop an output indicative of a signal reproduced by the record head for use in determining the point at which a new recording is to commence, and a reproduction head, to enable substantially immediate reproduction of a newly recorded signal.

Claim 10

An optical record/reproduction apparatus, including a signal processing circuit having an input which can be switched between a record head, whereby the circuit can develop an output indicative of a signal reproduced by the record head for use in determining the point at which a new recording is to commence, and a reproduction head, to enable substantially immediate reproduction of a newly recorded signal.