Data synchronizing signal detecting device

A data synchronizing signal detecting device, comprising:

• means for separating a data bit string having a data sync signal detection pattern output from a data discriminator into a corresponding sync signal pattern, a plurality of bits to be compared and a bit not to be compared to produce groups having a predetermined number of bits from said plurality of bits to be compared;
• means for comparing each of said groups with said corresponding data sync signal pattern to acquire a coincidence;
• and
• means for receiving an output from each of said compare means and detecting a data sync signal when number of coincided groups is equal to or greater than a threshold value,
• wherein said data discriminator includes a most-likelihood decoder.

A data synchronizing signal detecting device, comprising:

• means for separating a data bit string having a data sync signal detection pattern output from a data discriminator into a corresponding sync signal pattern, a plurality of bits to be compared and a bit not to be compared to produce groups having a predetermined number of bits from said plurality of bits to be compared;
• means for comparing each of said groups with said corresponding data sync signal pattern to acquire a coincidence;
• and
• means for receiving an output from each of said compare means and detecting a data sync signal when a number of coincided groups is equal to or greater than a threshold value,
• wherein said data discriminator includes a most-likelihood decoder, and
• wherein said most-likelihood decoder includes a Viterbi decoder.

A data synchronizing signal detecting device comprising:

• a shift register which shifts and holds data output from a data discriminator;
• compare means for comparing a data sync signal detection pattern output from said data discriminator with each data sync signal pattern of groups each having a predetermined number of bits and acquiring a coincidence;
• and
• an adder/majority decision circuit which detects a data sync signal when the number of said groups coincided by the comparison in said compare means is equal to or greater than a threshold value,
• wherein said groups are separated into outputs which are utilized for the comparison of the outputs from said shift register and which are not utilized for the comparison of the outputs therefrom, and bits among the outputs to be utilized for the comparison are further separated into odd-numbered bits and even-numbered bits, and said groups being produced by a combination of the odd-numbered bits and a combination of the even numbered bits.

A data synchronizing signal detecting device comprising:

• a shift register which shifts and holds data output from a data discriminator;
• compare means for comparing a data sync signal detection pattern output from said data discriminator with each data sync signal pattern of groups each having a predetermined number of bits and acquiring a coincidence;
• and
• an adder/majority decision circuit which detects a data sync signal when the number of said groups coincided by the comparison in said compare means is equal to or greater than a threshold value,
• wherein said data discriminator includes a most-likelihood decoder.

A data synchronizing signal detecting device comprising:

• a shift register which shifts and holds data output from a data discriminator;
• compare means for comparing a data sync signal detection pattern output from said data discriminator with each data sync signal pattern of groups each having a predetermined number of bits and acquiring a coincidence;
• and
• an adder/majority decision circuit which detects a data sync signal when the number of said groups coincided by the comparison in said compare means is equal to or greater than a threshold value,
• wherein said data discriminator includes a most-likelihood decoder, and
• wherein said most-likelihood decoder includes a Viterbi decoder.

A data synchronizing signal detecting method comprising the steps of:

• separating a data sync detection signal output from a data discriminator into a data sync signal pattern, a plurality of bit string patterns to be compared comparison and a bit string pattern to not be compared;
• said plurality of bit string patterns to be compared are divided into a plurality of groups each having a predetermined number of bits;
• comparing outputs from said groups with corresponding predetermined data sync signal pattern;
• and
• comparing respective results of comparisons and detecting a data sync signal when number of coincided groups is equal to or greater than a threshold value,
• wherein said bit string patterns to be compared are separated into odd-numbered bit strings and even-numbered bit strings to produce said groups from a combination of the odd-numbered bit strings and a combination of the even-numbered bit strings.