Transmitting a digital signal and an additional signal
First Claim
1. A method of transmitting a digital signal, comprising n-bit sequences, and an additional signal, comprising the steps of:
- providing first and second sets of m-bit sequences, where m>
n, each of said first and second sets having at least as many different m-bit sequences as there are different n-bit sequences;
converting each n-bit sequence of the digital signal into a respective m-bit sequence of the first set when the additional signal has a first state;
converting each n-bit sequence of the digital signal into a respective m-bit sequence of the second set when the additional signal has a second state; and
transmitting the m-bit sequences.
2 Assignments
0 Petitions
Accused Products
Abstract
A digital signal, such as a t.d.m. PCM signal, is redundantly encoded in that sequences of n bits of the signal are transmitted as sequences of m bits, where m>n. Different sets of m-bit sequences are used to transmit the n-bit sequences in dependence upon the state of an additional signal, which may be a superframe indication signal. At a receiver, the digital signal and additional signal are reproduced. In the described embodiment =n+2, providing further redundancy to facilitate providing such desirable transmission code properties as maintaining d.c. balance and detecting errors on the transmission link.
14 Citations
18 Claims
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1. A method of transmitting a digital signal, comprising n-bit sequences, and an additional signal, comprising the steps of:
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providing first and second sets of m-bit sequences, where m>
n, each of said first and second sets having at least as many different m-bit sequences as there are different n-bit sequences;converting each n-bit sequence of the digital signal into a respective m-bit sequence of the first set when the additional signal has a first state; converting each n-bit sequence of the digital signal into a respective m-bit sequence of the second set when the additional signal has a second state; and transmitting the m-bit sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for transmitting a digital signal, comprising n-bit sequences, and an additional signal, comprising:
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means for storing first and second sets of m-bit sequences, where m>
n, each of said first and second sets having at least as many different m-bit sequences as there are different n-bit sequences;means for addressing the storing means with each n-bit sequence of the digital signal and with the additional signal to supply from the storing means a respective m-bit sequence of the first set when the additional signal has a first state and a respective m-bit sequence of the second set when the additional signal has a second state; and means for transmitting the m-bit sequences. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification