Digital transmission system using subband coding of a digital si

Details Digital transmission system using subband coding of a digital si Digital transmission system using subband coding of a digital si

1990-05-31

1993-05-25

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

381 31, H04B 166

Patent

active

052146782

ABSTRACT:
A digital transmission system is disclosed having a transmitter (3,6,9) and a receiver (13,16,19) for transmitting a digital signal, such as a digital audio signal, having a given sampling rate F.sub.S. The digital signal is subband coded into M subbands with sampling rate reduction. To that purpose the transmitter includes a first unit (3) for splitting up the digital signal into M signals having a sampling rate F.sub.S /M. These signals are available at the outputs (4.1 to 4.M) of the first unit (3), and are applied to M analysis filters (6.1 to 6.M), each filter (6.m) having one input (5.m) and two outputs (7.ma and 7.mb). The 2M filter outputs are coupled to 2M inputs (8.1 to 8.2M) of a signal processing unit 9 which has M outputs (10.1 to 10M) for supplying the M subband signals (S.sub.1 to S.sub.M). Each filter (6.m) is adapted to apply two different filterings on the signal applied to its input and to supply the two different filtered versions of the input signal to its two outputs. The signal processing unit 9 is adapted to supply output signals on each of the M outputs, an output signal being a combination of at least a number of input signals applied to its 2M inputs. On the receiver side a signal processing is carried out which is largely inverse to the signal processing on the transmitter side, in order to realize a signal at the output (21) that is a nearly perfect reconstruction of the input signal.

REFERENCES:
patent: 4569075 (1986-02-01), Nussbaumer
patent: 4799179 (1989-01-01), Masson et al.
patent: 4896362 (1990-01-01), Voldhuis et al.
patent: 4956871 (1990-09-01), Swaminathan
"The critical band coder--Digital Encoding of Speech Signals based on the perceptual requirement of the auditory system", Michael A. Krasner, IEEE, pp. 327-331 1980.
Stall et al, "Law bite rate coding of high-quality audio signals introduction to the Mascam System" EBU Review Technical No. 230, pp. 71-94 Aug. 1988.

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