Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

Gerardus C P Lokhoff

Yves-Francois Dehery

Gunther Josef Stoll

Gerhard J Stoll

Günther Theile

Reproduction accuracy of a digital signal, representing, for example, stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The stereo audio signals are coded into sub(band) signals. Corresponding sub(band) signals of the stereo audio signals may be processed to obtain composite sub(band) signals, which are recorded on a record carrier. To identify whether corresponding sub(band) signals have been processed or not, a mode indicator control signal, indicating whether a corresponding sub signal of the at least two signal components have or have not been processed into a composite sub-signal, is also being recorded on the record carrier.

Record carrier having an encoded wide-band digital audio signal recorded thereon

Reproduction accuracy of a digital signal, representing for example stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The transmission signals are arranged in consecutive frames, each frame including a plurality of information packets, and each information packet including N bits. The number of information packets in a frame is determined by the ratio of the product of the transmission bit-rate and the number of samples represented in the frame, to the product of the number of bits in a packet and the sampling frequency. The transmission signals are recorded in a record carrier, or are transmitted in real time. In a digital stereo audio signal embodiment, the samples may be sub-band encoded or transform encoded. The transmission signal may include an indicator signal indicating a combination of certain samples, or scale factor signals for specific components of the sampled signal.

Decoding of an encoded wideband digital audio signal in a transmission system for transmitting and receiving such signal

Audio systems using a digital audio interface between a sender and a receiver are known. Due to the digital revolution, it is very easy to make copies of copyright protected work. By using a bi-directional control bus in the audio interface, it is made possible to send audio signals with a standard quality to &ldquo;normal&rdquo; receivers audio, and higher quality audio to receivers which are authorized to receive higher quality audio.

Audio system and audio interface

Digital sub-band transmission system with transmission of an additional signal

Reproduction accuracy of a digital signal, representing for example stereo audio signals, is improved by transmitting sample data which have been encoded to form transmission signals. The transmission signals are arranged in consecutive frames, each frame including a plurality of information packets, and each information packet including N bits. The number of information packets in a frame is determined by the ratio of the product of the transmission bitrate and the number of samples represented in the frame, to the product of the number of bits in a packet and the sampling frequency. The transmission signals are recorded in a record carrier, or are transmitted in real time. In a digital stereo audio signal embodiment the samples may be subband encoded or transform encoded. The transmission signal may include an indicator signal indicating a combination of certain samples, or scale factor signals for specific components of the sampled Signal.

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Eindhoven, Netherlands

Gerardus C P Lokhoff