Asymmetry detection apparatus, jitter detection apparatus, and recording/reproduction apparatus

A recording/reproduction apparatus, comprising:

• (a) an asymmetry detection apparatus for detecting asymmetry in a reproduced signal which is obtained by reproducing digital information recorded on an information carrier, the asymmetry detection apparatus comprising:
• (i) a clock signal generator for generating a clock signal based on the reproduced signal;
• an A/D converter for sampling the reproduced signal in synchronization with the clock signal,
• (ii) a determiner for determining whether a level of each of a plurality of sampled data obtained by the sampling operation is equal to or greater than a predetermined level, and
• (iii) a detector for selecting predetermined ones of the plurality of sampled data based on an output from the determiner so as to detect asymmetry in the reproduced signal by using the selected predetermined ones of the plurality of sampled data;
• (b) a recording parameter setting section for setting a recording parameter based on the asymmetry in the reproduced signal detected by the asymmetry detection apparatus;
• and
• (c) a recording apparatus for recording digital information on the information carrier by using the recording parameter.

A jitter detection apparatus for detecting jitter in a reproduced signal which is obtained by reproducing digital information recorded on an information carrier, the jitter detection apparatus comprising:

• a clock signal generator for generating a clock signal based on the reproduced signal;
• an A/D converter for sampling the reproduced signal in synchronization with the clock signal;
• a determiner for determining whether a level of each of a plurality of sampled data obtained by the sampling operation is equal to or greater than a predetermined level;
• and
• a detector for detecting jitter in the reproduced signal by using predetermined ones of the plurality of sampled data based on an output from the determiner.

A recording/reproduction apparatus, comprising:

• (a) a jitter detection apparatus for detecting jitter in a reproduced signal which is obtained by reproducing digital information recorded on an information carrier, the jitter detection apparatus comprising:
• (i) a clock signal generator for generating a clock signal based on the reproduced signal;
• an A/D converter for sampling the reproduced signal in synchronization with the clock signal,
• (ii) a determiner for determining whether a level of each plurality of sampled data obtained by the sampling operation is equal to or greater than a predetermined level, and
• (iii) a detector for detecting jitter in the reproduced signal by using predetermined ones of the plurality of sampled data based on an output from the determiner;
• (b) a recording parameter setting section for setting a recording parameter based on the jitter in the reproduced signal detected by the jitter detection apparatus;
• and
• (c) a recording apparatus for recording digital information on the information carrier by using the recording parameter.

A method for detecting asymmetry in a reproduced signal which is obtained by reproducing digital information recorded on an information carrier, the asymmetry detection method comprising the steps of:

• generating a clock signal based on the reproduced signal;
• sampling the reproduced signal in synchronization with the clock signal;
• and
• detecting asymmetry in the reproduced signal by accumulating selected ones of a plurality of sampled data obtained by the sampling operation.

A method for detecting jitter in a reproduced signal which is obtained by reproducing digital information recorded on an information carrier, the jitter detection method comprising the steps of:

• generating a clock signal based on the reproduced signal;
• sampling the reproduced signal in synchronization with the clock signal;
• and
• detecting jitter in the reproduced signal by accumulating selected ones of a plurality of sampled data obtained by the sampling operation.