Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
Apparatus for correcting a PCM signal comprising time interleaved binary data words and error correction and error detection words, the apparatus comprising: an error detecting circuit (16) receiving the incoming PCM signal; a time de-interleaver (17) receiving the incoming signal and separating it into a plurality of parallel binary data and error correction and error detection words; a syndrome generating and abnormality detecting circuit (18) receiving the output of said time de-interleaver (17); a data correcting circuit (20) receiving inputs from said de-interleaver (17) and said syndrome generating and abnormality detecting circuit (18); and an error compensating circuit (21) receiving an output of said data correcting circuit.
Claim 2
Dependent Claim
107 words
Apparatus for correcting a PCM signal comprising time interleaved binary data words and error correction and error detection words, the apparatus comprising: an error detecting circuit (16) receiving the incoming PCM signal; a time de-interleaver (17) receiving the incoming signal and separating it into a plurality of parallel binary data and error correction and error detection words; a syndrome generating and abnormality detecting circuit (18) receiving the output of said time de-interleaver (17); a data correcting circuit (20) receiving inputs from said de-interleaver (17) and said syndrome generating and abnormality detecting circuit (18); and an error compensating circuit (21) receiving an output of said data correcting circuit.
Claim 3
Dependent Claim
36 words
Apparatus according to claim 1 including a flip-flop (24) for , producing a flag which is supplied to said data correcting circuit (20) and receiving an input from said syndrome generating and abnormality detecting circuit (18).
Claim 4
Dependent Claim
25 words
Apparatus according to claim 2 including gate means (22, 23) connected to said time de-interleaver (17) and said syndrome generating and abnormality detecting circuit (18).
Claim 5
Dependent Claim
19 words
Apparatus according to claim 3 wherein said gate means comprises an AND gate (22) and an OR gate (23).
Claim 6
Dependent Claim
33 words
Apparatus according to claim 2 wherein said time de-interleaver (17) includes a series-to-parallel converter (15), and a time delay means (17) for converting said PCM signal into a plurality of time delayed signals.
Claim 7
Dependent Claim
25 words
Apparatus according to claim 6 including a one block delay circuit (19) connected between said time delay means (17) and said data correcting circuit (20).
Claim 8
Dependent Claim
254 words
A PCM signal processing apparatus arranged to receive successive transmission blocks, each comprising time-interleaved PCM data, and error correction and error detection words, said apparatus comprising: detecting means (16) responsive to said error detection words for detecting if a received transmission block contains an error; error identifying means (18, 22, 23) for identifying as being erroneous each of the time-interleaved words included in the received transmission block which has been detected as containing an error; de-interleaving means (17) for time de-interleaving each received transmission block to recover a de-interleaved block formed of de-interleaved PCM and error-correction words with erroneous de-interleaved words being respectively identified; syndrome generating means (18) coupled to said de-interleaving means (17) for generating error syndrome signals using said de-interleaved PCM and said error-correction words in the de-interleaved block; error correcting means (20) responsive to said error syndrome for correcting an erroneous PCM word in said de-interleaved block as a function of the remaining non-erroneous PCM and error-correction words in that de-interleaved block; error compensating means (21) responsive to the identification of said error identifying means for compensating for said erroneous PCM word in said de-interleaved block with a substitute PCM word when error correction by said error correcting means is not possible; and inhibit means (24) which inhibits said error correcting means (20) when all of said error detection words in said de-interleaved block are identified as erroneous and which does not inhibit when the relationship between said error identifying means and said error syndrome signal indicates that no errors exist.
Claim 9
Dependent Claim
254 words
A PCM signal processing apparatus arranged to receive successive transmission blocks, each comprising time-interleaved PCM data, and error correction and error detection words, said apparatus comprising: detecting means (16) responsive to said error detection words for detecting if a received transmission block contains an error; error identifying means (18, 22, 23) for identifying as being erroneous each of the time-interleaved words included in the received transmission block which has been detected as containing an error; de-interleaving means (17) for time de-interleaving each received transmission block to recover a de-interleaved block formed of de-interleaved PCM and error-correction words with erroneous de-interleaved words being respectively identified; syndrome generating means (18) coupled to said de-interleaving means (17) for generating error syndrome signals using said de-interleaved PCM and said error-correction words in the de-interleaved block; error correcting means (20) responsive to said error syndrome for correcting an erroneous PCM word in said de-interleaved block as a function of the remaining non-erroneous PCM and error-correction words in that de-interleaved block; error compensating means (21) responsive to the identification of said error identifying means for compensating for said erroneous PCM word in said de-interleaved block with a substitute PCM word when error correction by said error correcting means is not possible; and inhibit means (24) which inhibits said error correcting means (20) when all of said error detection words in said de-interleaved block are identified as erroneous and which does not inhibit when the relationship between said error identifying means and said error syndrome signal indicates that no errors exist.