Method and device for signal reproduction used in a digital signal reproduction apparatus

A signal reproduction device for use in a digital signal reproduction apparatus which reproduces digital signals recorded on a recording medium with a reproduction head, said device comprising:

• first memory means for sequentially storing digital signals reproduced by said reproduction head;
• means for identifying a field of a digital signal reproduced by said reproduction head;
• write control means for judging, based on a result of the identification performed by said identification means, whether digital signals of a prescribed unit length included in said digital signals stored in said first memory means, have a same field as said identified field, and producing a write signal in response to the judgement;
• second memory means connected to said first memory means for storing said digital signals of the prescribed length judged to have the same field as said identified field in response to said write signal;
• and
• switch means which is responsive to said write signal, said switch means delivers the output of said first memory means to the input of said second memory means when said recording medium has a normal playback speed, or delivers the output of said second memory means to the input thereof during the absence of said write signal when said recording medium has a playback speed other than the normal speed, and is responsive to said write signal to deliver the output of said first memory means to the input of said second memory means.

A signal reproduction device for use in a digital signal reproduction apparatus which reproduces digital signals recorded on a recording medium with a reproduction head, said device comprising:

• first memory means for sequentially storing digital signals reproduced by said reproduction head;
• means for identifying a field of a digital signal reproduced by said reproduction head;
• write control means for judging, based on a result of the identification performed by said identification means, whether digital signals of a prescribed unit length included in said digital signals stored in said first memory means, have a same field as said identified field, and producing a write signal in response to the judgement;
• second memory means connected to said first memory means for storing said digital signals of the prescribed length judged to have the same field as said identified field in response to said write signal;
• means for judging whether a digital signal reproduced by said reproduction head involves error, and inhibiting the writing of an erroneous digital signal to said first memory means in response to the judgement of the presence of an error.

A signal reproduction method for a digital signal reproduction apparatus which reproduces digital video signals recorded on a recording medium with a reproduction head, said method comprising the steps of:

• sequentially storing digital video signals reproduced by said reproduction head into first memory means;
• identifying a field of a digital video signal reproduced by said reproduction head;
• judging, based on a result of the identifying step, whether digital video signals of a prescribed unit length included in said digital video signals stored in said first memory, have a same field as said identified field, and producing a write signal in response to the judgement;
• and
• storing said digital video signals of the prescribed length judged to have the same field as said identified field into second memory means in response to said write signal.

A signal reproduction device for use in a digital video signal reproduction apparatus which reproduces digital video signals recorded on a recording medium with a reproduction head, said device comprising:

• first memory means for sequentially storing digital video signals reproduced by said reproduction head;
• means for identifying a frame to which a digital video signal reproduced by said reproduction head belongs;
• write control means for judging, based on a result of the identification performed by said identification means, whether digital video signals of a prescribed unit length included in said digital video signals stored in said first memory means, belong to the same frame as said identified frame, and producing a write signal in response to the judgement;
• and
• second memory means connected to said first memory means for storing digital video signals of the prescribed length judged to belong to the same frame as said identified frame, in response to said write signal.

A signal reproduction device for use in a digital signal reproduction apparatus which reproduces digital signals recorded on a recording medium with a reproduction head, said device comprising:

• first memory means for sequentially storing digital signals reproduced by said reproduction head;
• means for identifying a field of a digital signal reproduced by said reproduction head;
• write control means for judging, based on a result of the identification performed by said identification means, whether digital signals of a prescribed unit length included in said digital signals stored in said first memory means, have a same field as said identified field, and producing a write signal in response to the judgment;
• second memory means connected to said first memory means for storing digital signals of the prescribed length judged to have the same field as said identified field in response to said write signal;
• wherein said identification means comprises means for identifying a frame to which a digital signal reproduced by said reproduction head belongs;
• said write control means comprises means for producing said write signal in response to the judgement that digital signals of the prescribed unit length included in digital signals stored in said first memory means, belong to the same frame as said identified frame, and producing a write signal in response to the judgement;
• said second memory means comprises means for storing digital signals which have been judged to belong to the same frame as said identified frame, in response to said write signal;
• and
• switch means which is responsive to said write signal, said switch means delivers the output of said first memory means to the input of said second memory means when said recording medium has a normal playback speed, or delivers the output of said second memory means to the input thereof during the absence of said write signal when said recording medium has a playback speed other than the normal speed, and is responsive to said write signal to deliver the output of said first memory means to the input of said second memory means.

A signal reproduction device for use in a digital signal reproduction apparatus which reproduces digital signals recorded on a recording medium with a reproduction head, said device comprising:

• first memory means for sequentially storing digital signals reproduced by said reproduction head;
• means for identifying a frame of a digital signal reproduced by said reproduction head;
• write control means for judging, based on a result of the identification performed by said identification means, whether digital signals of a prescribed unit length included in said digital signals stored in said first memory means, have a same frame as said identified frame, and producing a write signal in response to the judgement;
• second memory means connected to said first memory means for storing digital signals of the prescribed length judged to have the same frame as said identified frame in response to said write signal;
• wherein said identification means comprises means for identifying a field to which a digital video signal belongs;
• said write control means comprises means for producing said write signal in response to the judgement that digital signals of the prescribed unit length included in digital signals stored in said first memory means, belong to the same field as said identified field, and producing a write signal in response to the judgement;
• said second memory means comprises means for storing digital signals which have been judged to belong to the same field as said identified field, in response to said write signal;
• and
• means for judging whether a digital signal reproduced by said reproduction head involves error, and inhibiting the writing of an erroneous digital signal to said first memory means in response to the judgement of the presence of an error.

A signal reproduction method for a digital signal reproduction apparatus which reproduces digital signals recorded on a recording medium with a reproduction head, said method comprising the steps of:

• storing sequentially digital video signals reproduced by said reproduction head into first memory means;
• identifying a frame to which a digital video signal reproduced by said reproduction head belongs;
• judging, based on the result of the identifying step, whether all digital video signals with a prescribe unit length included in digital video signals stored in said first memory belong to a same frame as said identified frame, and producing a write signal in response to the judgement;
• and
• storing digital video signals with the prescribed length and of the same frame as said identified frame into second memory means in response to said write signal.