US 6,289,308 B1Granted

Encoded wideband digital transmission signal and record carrier recorded with such a signal

AssigneeU.S. Philips Corporation

InventorGerardus C. P. Lokhoff

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Abstract

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.

Claims34

Dependent claims

A transmission signal which is an article of manufacture, produced by encoding a wideband digital signal of a specific sampling frequency Fs in an encoder, the transmission signal comprising consecutive frames, each frame comprising a plurality of information packets (IP), each information packet being composed of N bits, N being larger than 1, and a frame comprising at least a first frame portion including synchronization information, characterized in that:

the number B of information packets in one frame has a relation to a value P, such that,
if P in the formula
P=(BR×ns)/(N×Fs)
is an integer, where BR is the bit rate of the transmission signal and ns is the number of samples of the wideband digital signal whose corresponding information in the transmission signal is included in one frame of the transmission signal, the number B of information packets in one frame is P, or that,
if P is not an integer, the number B of information packets in a number of frames is P′, where P′ is the next lower integer following P, and the number of information packets in the other frames is equal to P′+1 so as to exactly comply with the requirement that the average frame rate of the transmission signal is substantially equal to Fs/ns.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/521,052Filed 8 Mar 2000 · division
Priority: 1 Jun 1990
Granted: 11 Sep 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

H04B 1/667
For reducing bandwidth of signals; for improving efficiency of transmission: using a division in frequency subbands
G10L 19/0204
Using spectral analysis, e.g. transform vocoders or subband vocoders: using subband decomposition
G11B 20/00007
Signal processing not specific to the method of recording or reproducing; Circuits therefor: time or data compression or expansion
G11B 20/10
Signal processing not specific to the method of recording or reproducing; Circuits therefor: digital recording or reproducing

Family

Application07/532,462Parent of this continuation · filed 1 Jun 1990
Application07/997,158Parent of this continuation · filed 21 Dec 1992
Application08/173,850Parent of this division · filed 27 Dec 1993
Application08/488,536Parent of this division · filed 7 Jun 1995
US 5,606,618 AParent of this division
Application08/173,850Parent of this continuation
US 5,323,396 AParent of this continuation
US 6,289,308 B1This patent

From the US filing history. Foreign family members aren’t listed.