Processing digital data
AssigneeSony Europe Limited
InventorsRodney Densham, William Cranstoun Kentish, Nicholas Haynes, Peter Eastly
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Abstract
An original digital audio signal represents unimpaired audio information. The digital audio signal is compressed and encrypted without substantial impairment to produce a first audio signal. A second, unencrypted, audio signal is produced. The first and second audio signals are combined. Preferably the first audio signal is losslessy compressed. The second audio signal may be an impaired version of the original digital audio signal.
Claims110
A method for processing a digital audio signal comprising the steps of:
- providing a digital audio signal representing unimpaired audio information;
- compressing and encrypting the said digital audio signal to produce a first compressed and encrypted audio signal, the audio information of which is substantially unimpaired compared to that of the said digital audio signal;
- producing an unencrypted second audio signal;
- and
- combining the said first and second audio signals to produce a combined signal comprising the compressed and encrypted first audio signal and the unencrypted second audio signal.
The method according to 32, wherein the data indicating the section boundaries identifies the data included in the sections.
The method according to claim;
- 45, wherein the combined signal includes data indicating which bits of the combined signal are LSBs and which bits are MSBs.
An apparatus for processing a digital signal comprising:
- a first input for receiving a digital audio signal representing complete and unimpaired audio information;
- a compressor and encryptor arranged to compress and encrypt the digital audio signal arranged to produce a compressed and encrypted first audio signal, the audio information of which is substantially unimpaired compared to that of the digital audio signal;
- a second input for receiving an unencrypted second audio signal;
- and
- a signal combiner arranged to combine the first and the second audio signals to produce a combined signal comprising the compressed and encrypted audio signal and the unencrypted second signal.
A data structure, that is machine-interpretable, comprising:
- a combination of a compressed and subsequently encrypted first digital audio signal, the audio information of which is substantially unimpaired;
- and
- an unencrypted second digital audio signal.
A method of recovering a first signal from a combination of a first, compressed and encrypted, digital audio signal combined with a second signal, the audio information of the first audio signal being substantially unimpaired, the method comprising the steps of:
- separating the first signal from the combination;
- decrypting the separated first signal;
- and
- decompressing the decrypted first signal to recover the substantially unimpaired audio information thereof.
An apparatus for recovering a digital signal, the digital signal being compressed and encrypted and combined with a second signal, the apparatus comprising
- a separator for separating the compressed and encrypted signal from the second signal;
- a decryptor for decrypting the separated signal;
- and
- a decompressor for decompressing the decrypted signal.
A method of processing a digital signal comprising the steps of:
- providing a first digital signal representing first information;
- providing a second digital signal;
- and
- embedding the first signal in the second signal by replacing Less Significant Bits (LSBs) of the second signal by bits of the first signal and retaining More Significant Bits (MSBs) of the second signal,
- whereby the first signal occurs as noise in the second signal.
A method of processing a digital signal comprising the steps of:
- providing a first digital signal representing first information;
- providing a second digital signal;
- and
- embedding the first signal in the second signal by selecting groups of N samples and distributing over the N samples of each group corresponding sets of M samples of the first signal, where the ratio M/N is an integer fraction.
A method of processing a digital signal comprising the steps of:
- providing a first digital signal representing substantially unimpaired first information, the first signal being a compressed and/or encrypted signals;
- providing an unencrypted second digital signal representing second information, and which is compressed according to a compression format having auxiliary data space;
- combining the first signal comprising the substantially unimpaired first information with the second signal;
- and
- embedding at least part of the first signal being embedded in the auxiliary data space of the second signal.
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Dependencies are inferred from the claim text.