Information reproducing apparatus capable of eliminating jitters

A method for reproducing data in which jitter resulting from undesired differences in relative movement between a read head and a recording medium driven by a drive means is eliminated, as data is read by said read head simultaneously from at least two of a plurality of recording areas of said recording medium, the method comprising the steps of:

• storing data in a memory from at least one of said two areas of said recording medium, said data being read by said read head, and said memory including a memory address;
• detecting in said drive means a relative position between said recording medium and said read head;
• controlling said storing of data in said memory, based on the detected relative position between said recording medium and said read head, said controlling step controlling said memory address and a writing operation to write said data read by said read head in said memory based on the detected relative position between said recording medium and said read head, as said drive means drives said recording medium, for eliminating jitter in the data being stored in said memory;
• and then
• reading out stored, jitter free, data from said memory, sequentially and in synchronism with clock signals from a clock source, said clock signals having a specified period, for demodulating said read out jitter free stored data, to thereby provide a jitter free output data signal.

A data reproducing apparatus wherein data written in a plurality of tracks of a recording medium is read simultaneously by a reading head by moving said recording medium and said reading head relative to each other with a drive means, said data reproducing apparatus comprising:

• memory means for storing data read from at least one of said plurality of tracks of said recording medium, by said reading head, said memory means including a memory address;
• relative position detecting means included in said drive means for detecting a relative position between said recording medium and said reading head;
• means for generating a write pulse signal that is useable for storing data read by said reading head in said memory means, based on a change in a relative position detection signal provided by said relative position detecting means, said write pulse controlling said memory address and a writing operation for writing said data read by said reading head in said memory means based on said relative position detection signal provided by said relative position detecting means as said drive means drives said recording medium, in synchronism with said write pulse signal;
• and
• reading means for reading said data stored in said memory means in synchronism with a read pulse signal generated by a pulse signal source, said read pulse signal having a plurality of given continuous periods.

A data reproducing apparatus wherein data written in a plurality of tracks of a recording medium is read simultaneously by a reading head by moving said recording medium and said reading head relative to each other with a drive means, said data reproducing apparatus comprising:

• memory means for storing data that is read from at least one of said plurality of tracks of said recording medium, by said reading head, said memory means including a memory address;
• first pulse generating means for generating a first pulse that is useable for storing said data read by said reading head, based on a change in a relative position between said reading head and said recording medium, said first pulse controlling said memory address and a writing operation, for writing said data read by said reading head in said memory means based on a relative position output signal output by said drive means as said drive means drives said recording medium;
• second pulse generating means for generating a second pulse having a plurality of given continuous periods, said second pulse being usable for reading said data stored in said memory means;
• demodulating means for demodulating data read out from said memory means;
• and
• control means for controlling a selection of one of the first and second pulses, said control means selecting said first pulse generated by said first pulse generating means when data is written in said memory means, said control means selecting said second pulse generated by the second pulse generating means when data is read out from said memory means.

A data reproducing apparatus wherein data written in a plurality of tracks of a recording medium is read simultaneously by a reading head by moving said recording medium and said reading head relative to each other with a drive means, said data reproducing apparatus comprising:

• memory means for storing data read from at least one of said plurality of tracks of said recording medium, by said reading head, said memory means including a memory address;
• relative position detecting means for detecting a relative position between said recording medium and said reading head;
• means for generating a variable frequency write pulse signal that is useable for storing data read by said reading head in said memory means, a frequency of said variable frequency write pulse signal varying in accordance with a change in a relative position detection signal provided by said relative position detecting means, said variable frequency write pulse controlling said memory address and a writing operation for writing said data read by said reading head in said memory means based on said relative position detection signal that is generated on said drive means drives said recording medium, in synchronism with said write pulse signal;
• and
• reading means for reading said data stored in said memory means in synchronism with a read pulse signal generated by a pulse signal source, said read pulse signal having a plurality of given continuous periods.

A data reproducing apparatus wherein data written in a plurality of tracks of a recording medium is read simultaneously by a reading head by moving said recording medium and said reading head relative to each other with a drive means, said data reproducing apparatus comprising:

• memory means for storing data that is read from at least one of said plurality of tracks of said recording medium, by said reading head, said memory means including a memory address;
• first pulse generating means for generating a variable frequency first pulse that is useable for storing said data read by said reading head, based on a change in a relative position between said reading head and said recording medium, said variable frequency first pulse varying in frequency in accordance with said change in relative position between said reading head and said recording medium, said first pulse controlling said memory address and a writing operation, for writing said data read by said reading head in said memory means based on a relative position output signal output by said drive means as said drive means drives said recording medium;
• second pulse generating means for generating a second pulse having a plurality of given continuous periods, said second pulse being usable for reading said data stored in said memory means;
• demodulating means for demodulating data read out from said memory means;
• and
• control means for controlling a selection of one of the first and second pulses, said control means selecting said variable frequency first pulse generated by said first pulse generating means when data is written in said memory means, said control means selecting said second pulse generated by the second pulse generating means when data is read out from said memory means.