Prediction on data in a transmission system

Details Prediction on data in a transmission system Prediction on data in a transmission system

1999-03-16

2001-09-04

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

Adaptive coding

C341S067000

Reexamination Certificate

active

06285301

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to the field of digital signal compression and compressed signal transmission.
BACKGROUND OF THE INVENTION
The invention relates to a transmitting device for transmitting a digital information signal via a transmission medium, including:
an adaptive encoder adapted to compress the digital information signal into encoded signal and to generate a parameter signal,
a first signal combination unit adapted to combine the encoded signal and a representation of the parameter signal so as to obtain a transmission signal for the transmission via the transmission medium.
The invention further relates to a receiving device for receiving a transmission signal, to a method of transmitting a digital information signal and a representation of the parameter signal via a transmission medium, and to a record carrier obtained by the transmitting device or the method in accordance with the invention.
A transmitting and receiving device of the type defined in the opening paragraphs is known from J. Audio Eng. Soc., Vol. 44, No. 9, pp. 706-719, September 1996 and the AES preprint 4563, “Improved Lossless Coding of 1-Bit Audio Signals” by Fons Bruekers et al, 103rd AES Convention (New York, U.S.). The known transmitting device is intended for efficiently reducing the bit rate for the transmission of a digital information signal. A transmission signal thus obtained comprises an encoded version of the digital information signal and a representation of the parameter signal. The parameter signal contains parameters required in a receiving device in order to decode the encoded versions of the digital information signal into the digital information signal. The transmission signal obtained by means of the known transmitting device now demands less capacity from a transmission medium during the transmission of the digital information signal. The parameter signal can contain the coefficients used in an adaptive prediction filter or a probability table provided in the encoder. These coefficients are transmitted via the transmission medium. In the known receiving device the transmission signal is processed so as to generate a replica of the original digital information signal.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a transmitting and/or a receiving device which reduces the bit rate for the transmission of a digital information signal more efficiently.
To this end, a transmitting device in accordance with the invention is characterized in that the transmitting device includes
a device including a prediction filter for deriving a prediction signal which is an approximation to the parameter signal,
a second signal combination unit for combining the prediction signal and the parameter signal so as to obtain the representation of the parameter signal.
A receiving device in accordance with the invention is characterized in that the receiving device includes:
a signal combination unit for combining the representation of the parameter signal and a prediction signal so as to form the parameter signal,
a prediction filter for deriving the prediction signal which is an approximation to the parameter signal.
A method in accordance with the invention is characterized in that the method further includes the steps of:
deriving a prediction signal which is an approximation to the parameter signal,
combining the prediction signal and the parameter signal so as to obtain the representation of the parameter signal.
The invention is based on the recognition of the fact that the number of bits required for transmitting a signal can be reduced by the use of a prediction filter. For this purpose the known transmitting device uses a prediction filter for the efficient compression of the digital information signal. Surprisingly, it has now also been found that the use of prediction on the parameter signal reduces the number of bits necessary for the transmission of the parameters.


REFERENCES:
patent: 4075655 (1978-02-01), Iijima et al.
patent: 4918729 (1990-04-01), Kudoh
patent: 5249200 (1993-09-01), Chen et al.
patent: 5424733 (1995-06-01), Fimoff et al.
patent: 5434948 (1995-07-01), Holt et al.
patent: 5533052 (1996-07-01), Bhaskar
patent: 5602602 (1997-02-01), Hulyalkar

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