Recording medium playback apparatus including a variable compensation circuit
AssigneePioneer Electronic Corporation
InventorAkihiro Tozaki
Life of this patent
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Abstract
A recording medium playback apparatus for production of a composite video signal by combining a multiplicity of H-line video signals reproduced from playback of a plurality of recording media which carry different video signals respectively is provided in which when some H-line video signals are absent in the composite video signal, the number of the absent H-line video signals are examined and then, compensation for the absent H-line video signals is executed by interpolation between two, preceding and succeeding, H-line video signals if the number is not more than a given value or by holding a row of the preceding H-line video signals if the number exceeds the given value.
Claims13
A recording medium playback apparatus having a plurality of players for playback of their respective recording media carrying different video signals and a composite means for producing a composite video signal by combining a multiplicity of video signals, each being assigned to an H-line, reproduced with the players, comprising:
- discrepancy detecting means for producing a discrepancy signal upon appearance of a defective H-line video signal in the video signals reproduced from the recording media;
- and
- compensating means for compensating for the defective H-line video signal in the composite video signal in accordance with the discrepancy signal, said compensating means being arranged so that after a number of the consecutive discrepancy signals is examined, compensation for the defective H-line video signals is executed with the use of an interpolation signal produced from two, preceding and succeeding, H-line video signals if the number is not more than a given value and with the holding of the preceding H-line video signals if the number is more than the given value.
A method for compensating for discrepancies in a recording medium playback apparatus having a plurality of players for playback of their respective recording media carrying different video signals and a composite means for producing a composite video signal by combining a multiplicity of video signals, each being assigned to an H-line, reproduced with the players, said method comprising the steps of:
- generating a plurality of discrepancy signals, each of said discrepancy signals being generated in response to appearance of a defective corresponding H-line video signal in the video signals reproduced from the recording media;
- determining a total number of said discrepancy signals;
- conducting compensation using an interpolation signal produced from a preceding H-line video signal and a succeeding H-line video signal when said total number of said discrepancy signals is not more than a given value;
- and
- conducting compensation by holding the preceding H-line video signal if said total number of said discrepancy signals is more than the given value.
A recording medium playback apparatus having a plurality of players for playback of their respective recording media carrying different video signals and a composite means for producing a composite video signal by combining a multiplicity of video signals, each being assigned to an H-line, reproduced with the players, comprising:
- a discrepancy detecting circuit for producing a discrepancy signal in response to appearance of a defective H-line video signal in the video signals reproduced from the recording media;
- a filter circuit for compensating for the defective H-line video signal in the composite video signal based on said discrepancy signal, said filter circuit being characterized in that, after a predetermined number of consecutive discrepancy signals is examined and a total number of said discrepancy is determined, compensation for the defective H-line video signals is executed with the use of an interpolation signal produced from a preceding H-line and a succeeding H-line video signal if said total number is not more than a given value and with the holding of the preceding H-line video signals if said total number is more than the given value.
A recording medium playback apparatus having a plurality of players for playback of their respective recording media carrying different video signals and composite means for producing a composite video signal by combining a multiplicity of video signals, each being assigned to an H-line, reproduced with the players, comprising:
- discrepancy detecting means for producing a discrepancy signal upon appearance of a defective H-line video signal in the composite video signal reproduced from the recording media;
- and
- compensating means for compensating the defective H-line video signal in the composite video signal in accordance with the discrepancy signal, said compensating means including:
- first memory means for memorizing a predetermined number of the consecutive H-line video signals;
- second memory means for memorizing corresponding ones of said discrepancy signals with respect to the memorized H-line video signals;
- and
- calculation means for multiplying the memorized H-line video signals with corresponding coefficients and summing the multiplied H-line video signal with each other so as to produce a compensated H-line video signal, said corresponding coefficients being provided in response to said discrepancy signals.
Dependencies are inferred from the claim text.