Koninklijke Philips Corporation N.v.

Javier Francisco Aprea

Leon Maria Van De Kerkhof

Aweke Negash Lemma

Paulus Henricus Antonius Dillen, I

Thomas Boltze

An audio encoding scheme or a stream that encodes audio and video data is disclosed. The scheme has particular application in mezzanine-level coding in digital television broadcasting. The scheme has a mean effective audio frame length F that equals the video frame length 1/fover an integral number M video frames, by provision of audio frames variable in length F in a defined sequence where length=F(j) at encoding. The length of the audio frames may be varied by altering the length of overlap between adjacent frames in accordance with an algorithm that repeats after a sequence of M frames. An encoder and a decoder for such a scheme are also disclosed.

Audio coding

Method and apparatus are described for compensating for time offset in a received signal, so as to correctly align the frame sequence of a received signal to a sequence of transmitted symbols. Each symbol extends over Tsignal samples. The received signal is first divided into a sequence of frames of length T, and then each framedivided into a multiplicity of Nsub-frames. Subsequently, Nsequences of values are formed, where every successive value in each sequence is derived from the corresponding sub-frame within each successive frame. Each of the Nsequences is an estimate for the correctly aligned sequence of transmitted symbols.

Decoding of watermarked information signals

A method of generating a watermark signal, embedding the watermark signal within a multimedia signal, and subsequently detecting the watermark signal is described. The watermark signal is the sum of two sequences of values, the second sequence of values being a circularly shifted version of the first sequence.

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Eindhoven, Netherlands

Javier Francisco Aprea