Apparatus and method for receiving digital data at a first rate and outputting the data at a different rate

Claim 1

A method of receiving a continuous stream of digital data at a first data rate and outputting the data at a higher rate without loss of information, comprising the steps of: receiving an input frame of bit series digital data in a continuous stream and at a first bit rate D and wherein said frame includes S digital words where each word includes N bits; dividing said digital data into said words of N bits; adding a parity bit to each said word so that each word contains N+1 bits; storing said S words in sequence in S different locations in a first read/write memory means; reading out said data from said memory; adding a bit series sync word (N+1)R bits, where R is an integer, to said read-out data such that an output data frame includes, in bit series, said sync word and S data words each having N+1 bits; and, outputting said output data frame in bit series fashion in a continuous stream at a second bit rate E, where ##EQU1##

Claim 2

A method of receiving a continuous stream of digital data at a first data rate and outputting the data at a higher rate without loss of information, comprising the steps of: receiving an input frame of bit series digital data in a continuous stream and at a first bit rate D and wherein said frame includes S digital words where each word includes N bits; dividing said digital data into said words of N bits; adding a parity bit to each said word so that each word contains N+1 bits; storing said S words in sequence in S different locations in a first read/write memory means; reading out said data from said memory; adding a bit series sync word (N+1)R bits, where R is an integer, to said read-out data such that an output data frame includes, in bit series, said sync word and S data words each having N+1 bits; and, outputting said output data frame in bit series fashion in a continuous stream at a second bit rate E, where ##EQU1##

Claim 3

A method of receiving a continuous stream of digital data at a first data rate and outputting the data at a higher rate without loss of information, comprising the steps of: receiving an input frame of bit series digital data in a continuous stream and at a first bit rate D and wherein said frame includes S digital words where each word includes N bits; dividing said digital data into said words of N bits; adding a parity bit to each said word so that each word contains N+1 bits; storing said S words in sequence in S different locations in a first read/write memory means; reading out said data from said memory; adding a bit series sync word of (N+1)R bits, where R is an integer, to said read-out data such that an output data frame includes, in bit series, said sync word and S data words each having N+1 bits; outputting said output data frame in bit series fashion at a second bit rate E, where ##EQU2## recording said output data frame in bit series on a recording medium at said bit rate E; reading said recording medium at a bit rate E' where E' is proportional to E, to reconstruct said data frame in bit series fashion so that said reconstructed frame includes a said sync word having R(N+1) bits and S data words, each having N+1 bits; receiving said data frame in bit series at said bit rate E'; detecting said sync word and then storing said S data words and said sync word in sequence in a second read/write memory means; reading said data out of said second memory means to form a reconstructed data frame having only said S words with each word having only N bits; and, outputting said reconstructed data frame in bit series fashion at a reconstructed bit rate of D', where ##EQU3##

Claim 4

A method of receiving a continuous stream of digital data at a first data rate and outputting the data at a higher rate without loss of information, comprising the steps of: receiving an input frame of bit series digital data in a continuous stream and at a first bit rate D and wherein said frame includes S digital words where each word includes N bits; dividing said digital data into said words of N bits; adding a parity bit to each said word so that each word contains N+1 bits; storing said S words in sequence in S different locations in a first read/write memory means; reading out said data from said memory; adding a bit series sync word of (N+1)R bits, where R is an integer, to said read-out data such that an output data frame includes, in bit series, said sync word and S data words each having N+1 bits; outputting said output data frame in bit series fashion at a second bit rate E, where ##EQU2## recording said output data frame in bit series on a recording medium at said bit rate E; reading said recording medium at a bit rate E' where E' is proportional to E, to reconstruct said data frame in bit series fashion so that said reconstructed frame includes a said sync word having R(N+1) bits and S data words, each having N+1 bits; receiving said data frame in bit series at said bit rate E'; detecting said sync word and then storing said S data words and said sync word in sequence in a second read/write memory means; reading said data out of said second memory means to form a reconstructed data frame having only said S words with each word having only N bits; and, outputting said reconstructed data frame in bit series fashion at a reconstructed bit rate of D', where ##EQU3##

Claim 5

A method of reconstructing digital data recorded on a recording medium in bit series fashion at a bit rate E and wherein said data is recorded in frames with each frame including S digital words each having N+1 bits and a sync word having R(N+1) bits, where R is an integer; reading said recording medium at a bit rate E' where E' is proportional to E to reconstruct said data frame in bit series fashion so that said reconstructed frame includes a said sync word having R(N+1) bits and S data words, each having N+1 bits; receiving said data frame in bit series at said bit rate E'; detecting said sync word and then storing said S data words and said sync word in sequence in a second read/write memory means; reading said data out of said second memory means to form a reconstructed data frame having only said S words with each word having only N bits; and, outputting said reconstructed data frame in bit series fashion in a continuous stream at a reconstructed bit rate of D' where ##EQU4##

Claim 6

A method of reconstructing digital data recorded on a recording medium in bit series fashion at a bit rate E and wherein said data is recorded in frames with each frame including S digital words each having N+1 bits and a sync word having R(N+1) bits, where R is an integer; reading said recording medium at a bit rate E' where E' is proportional to E to reconstruct said data frame in bit series fashion so that said reconstructed frame includes a said sync word having R(N+1) bits and S data words, each having N+1 bits; receiving said data frame in bit series at said bit rate E'; detecting said sync word and then storing said S data words and said sync word in sequence in a second read/write memory means; reading said data out of said second memory means to form a reconstructed data frame having only said S words with each word having only N bits; and, outputting said reconstructed data frame in bit series fashion in a continuous stream at a reconstructed bit rate of D' where ##EQU4##

Claim 7

A method of receiving a continuous stream of digital data at a first data rate and outputting the data at a higher rate without loss of information, comprising the steps of: receiving a single channel of digital data in a continuous stream in bit series at a bit rate of CD; dividing said data into C bit series channels each having a bit rate of D; for each channel: receiving an input frame of bit series digital data at said bit rate D and wherein said frame includes S digital words where each word includes N bits; dividing said digital data into S words of N bits each; adding a parity bit to each said word so that each word contains N+1 bits; storing said S word in sequence in S different locations in a first read/write memory means; reading out said data from said memory; adding a bit series sync word of (N+1)R bits, where R is an integer, to said read-out data such that an output data frame includes, in bit series, said sync word and S data words each having N+1 bits; outputting said output data frame in bit series fashion at a bit rate E, where ##EQU5## simultaneously recording said output data frames for said C channels on respective ones of C recording tracks on a recording medium such that said sync words of said channels are in alignment and are each followed by S data words in alignment.

Claim 8

A method of receiving a continuous stream of digital data at a first data rate and outputting the data at a higher rate without loss of information, comprising the steps of: receiving a single channel of digital data in a continuous stream in bit series at a bit rate of CD; dividing said data into C bit series channels each having a bit rate of D; for each channel: receiving an input frame of bit series digital data at said bit rate D and wherein said frame includes S digital words where each word includes N bits; dividing said digital data into S words of N bits each; adding a parity bit to each said word so that each word contains N+1 bits; storing said S word in sequence in S different locations in a first read/write memory means; reading out said data from said memory; adding a bit series sync word of (N+1)R bits, where R is an integer, to said read-out data such that an output data frame includes, in bit series, said sync word and S data words each having N+1 bits; outputting said output data frame in bit series fashion at a bit rate E, where ##EQU5## simultaneously recording said output data frames for said C channels on respective ones of C recording tracks on a recording medium such that said sync words of said channels are in alignment and are each followed by S data words in alignment.