Detection device and method for detecting pilot signal component from digital signal as well as reproducing apparatus
AssigneeCanon Kabushiki Kaisha
InventorShinichi Hatae
Life of this patent
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Abstract
A signal detecting device for detecting a pilot signal component from a modulated digital signal which contains information data and the pilot signal component, comprises a digital converter for performing bit-quantization of the modulated digital signal, a detector for detecting the pilot signal component and a restoring circuit for restoring the information data, the detector and the restoring circuit both using an output of the converter. The detecting device is digital throughout since the pilot signal component is detected by using an output of the digital converter.
Claims15
A signal detecting device for detecting a pilot signal component from a modulated digital signal which contains binary information serially by bit and a pilot signal component, comprising:
- clock generating means for generating a clock which synchronizes with the modulated digital signal, the clock having a frequency that is sufficiently higher than a frequency of the pilot signal component;
- converting means for converting the modulated digital signal into a digital data stream including a plurality of bits corresponding to each one-bit of the binary information;
- restoring means for restoring the plurality of bits obtained from said converting means to the one-bit of the binary information;
- reducing means for reducing an amount of data of the digital data stream converted by said converting means;
- and
- detecting means for detecting the pilot signal component by using the output of said reducing means,
- wherein the digital data stream converted by said converting means is commonly utilized for restoring the binary information and for detecting the pilot signal component.
A signal detecting method for detecting a pilot signal component from a modulated digital signal which contains binary information serially by bit and a pilot signal component, comprising the steps of:
- generating a clock which synchronizes with the modulated digital signal, the clock having a frequency that is sufficiently higher than a frequency of the pilot signal component;
- converting the modulated digital signal into a digital data stream including a plurality of bits corresponding to each one-bit of the binary information;
- restoring the plurality of bits obtained in said converting step to the one-bit of the binary information;
- reducing an amount of data of the digital data stream converted in said converting step to generate a reduced data stream;
- and
- detecting the pilot signal component by using the reduced data stream obtained in said reducing step,
- wherein the digital data stream converted in said converting step is commonly utilized for restoring the binary information and for detecting the pilot signal component.
A reproducing apparatus for reproducing binary information from a modulated digital signal which contains binary information serially by bit and a pilot signal component, comprising:
- reproducing means for reproducing the modulated digital signal from a recording medium;
- clock generating means for generating a clock which synchronizes with the modulated digital signal, the clock having a frequency that is sufficiently higher than a frequency of the pilot signal component;
- converting means for converting the modulated digital signal reproduced by said reproducing means into a digital data stream including a plurality of bits corresponding to each one-bit of the binary information;
- restoring means for restoring the plurality of bits obtained by said converting means to the one-bit of the binary information;
- reducing means for reducing an amount of the digital data stream converted by said converting means;
- and
- control means for controlling a relative position of said reproducing means and the recording medium,
- wherein the digital data stream converted by said converting means is commonly utilized for restoring the binary information and for controlling the relative position of said reproducing means and the recording medium.
Dependencies are inferred from the claim text.