Method and apparatus for editing digital signal

Claim 3

A method of editing digital signals according to claim 1, wherein successive ones of said predetermined points are separated from one another by an equal amount such that the least common multiple of such amount and the length of said record medium corresponding to said predetermined delay amount is greater than the length of said record medium corresponding to an interleaved error correction block including the at least one error correction word and the digital information words constituting the generating elements thereof.

Claim 4

A method of editing digital signals according to claim 2, wherein said length corresponding to said interleaved error correction block equals (N+n-1)D, where N is the number of said sequences of digital information words, n is the number of sequences of error correction words, and D is the distance, in recording blocks, between said nearest ones of the error correction words and the words forming the generating elements thereof.

Claim 5

A method of editing digital signals according to claim 1, wherein successive ones of predetermined points are separated by an amount corresponding to a length of said record medium thereof corresponding to an interleaved error correction block including the at least one error correction word and the digital information words constituting the generating elements thereof.

Claim 6

Apparatus for editing digital signals recorded on a record medium wherein said recorded digital signals have been encoded for correction of multiple errors by processing the signal, prior to recording thereof, as sequences of error correcting blocks formed of a plurality of sequences of digital information words, at least one sequence of error correction words being inserted therein, generating elements of which are formed of words of the respective information word sequences, the information and error correction word sequences being interleaved by having respective different delays imparted thereto that are integral multiples of a predetermined delay amount, so that recording blocks are formed of the interleaved information and error correction words, and, on the record medium, each such error correction word and the information words constituting the generating elements thereof are spaced from nearest ones thereof by a predetermined plurality of such recording blocks; the apparatus comprising means for reproducing said digital signals from said record medium; means for providing an additional digital signal to be edited; means for mixing the reproduced digital signals and the additional signal to provide an edited signal; means for recording the edited digital signal on said record medium; and timing means for timing the commencement and termination of the recording of the edited digital signal to occur at predetermined points selected so that when editing is carried out, fewer than (m+1) errors will be generated.

Claim 7

Apparatus for editing digital signals recorded on a record medium wherein said recorded digital signals have been encoded for correction of multiple errors by processing the signal, prior to recording thereof, as sequences of error correcting blocks formed of a plurality of sequences of digital information words, at least one sequence of error correction words being inserted therein, generating elements of which are formed of words of the respective information word sequences, the information and error correction word sequences being interleaved by having respective different delays imparted thereto that are integral multiples of a predetermined delay amount, so that recording blocks are formed of the interleaved information and error correction words, and, on the record medium, each such error correction word and the information words constituting the generating elements thereof are spaced from nearest ones thereof by a predetermined plurality of such recording blocks; the apparatus comprising means for reproducing said digital signals from said record medium; means for providing an additional digital signal to be edited; means for mixing the reproduced digital signals and the additional signal to provide an edited signal; means for recording the edited digital signal on said record medium; and timing means for timing the commencement and termination of the recording of the edited digital signal to occur at predetermined points selected so that when editing is carried out, fewer than (m+1) errors will be generated.

Claim 8

Apparatus for editing digital signals according to claim 5, wherein said timing means includes means generating a control signal at a predetermined interval to control the commencement and termination of the recording of the edited digital signal.

Claim 9

Apparatus for editing digital signals according to claim 6, wherein said predetermined interval is greater than the largest of said respective different delays.

Claim 10

Apparatus for editing digital signals according to claim 6, wherein said respective different delays differ from one another by integral multiples of a number D of block lengths, and said predetermined intervals are selected to correspond to T block lengths such that the least common multiple of D and T is greater than the number of block lengths spanned by the digital information words and error correction words constituting an error correcting block.

Claim 11

Apparatus for editing digital signals according to claim 8, wherein there are N sequences of digital information words and n sequences of error correction words, and the least common multiple of D and T is greater than (N+n-1)D.

Claim 12

Apparatus for editing digital signals according to claim 6, wherein said means for generating a control signal includes means deriving from said medium a timing signal related to a predetermined number of said block lengths.

Claim 13

Apparatus for editing digital signals according to claim 10, wherein said recorded digital signals are recorded in one or more data tracks on said record medium, and sector address signals, comprising a plurality of bits and incrementing correspondingly with advance of said medium, for identifying particular groups of blocks of the recorded digital signals, are recorded in a separate track on said record medium; and said means for generating a control signal includes counter means having preset terminals coupled to receive a plurality of the less significant bits of the sector address signals and providing an output when the contents of said counter of said counter means equal a predetermined value, clock generator means providing pulses at the frequency of the blocks of the digital signal to said counter means to decrement the contents thereof, and switching means controlling the coupling of said edited signal to said means for recording in response to said output of said counter means.

Claim 14

Apparatus for editing digital signals according to claim 11, where said switching means includes D-type flip flop means having a clock input coupled to said counter means, a D input, and an output; OR-gate means having an output coupled to said D input, one input coupled to receive an edit control signal, and another input, and a delay line having an input coupled to said one input of the OR-gate means and an output coupled to said other input of said OR-gate means.

Claim 15

Apparatus for editing digital signals according to claim 5, wherein said means for mixing the reproduced signal and the additional digital signal includes cross fader means for gradually digitally blending such signals to provide a cross-faded digital signal as said edited signal.