Time-discrete stereo decoder

Details Time-discrete stereo decoder Time-discrete stereo decoder

1992-04-23

1993-10-26

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 7, 381 13, H04H 500

Patent

active

052573125

ABSTRACT:
A receiver having a signal path incorporating a tuner, a demodulator circuit for supplying a stereo multiplex signal having a baseband stereo sum signal (L+R), a 19 kHz stereo pilot and a stereo difference signal (L-R) which is double sideband amplitude-modulated on a suppressed 38 kHz subcarrier, a sampler for converting an analog signal into a time-discrete signal and a stereo decoder for time-division multiplex decoding of a time-discrete stereo multiplex signal into time-discrete left and right stereo signals. In order to realize an effective selection of the stereo multiplex signal by an easily integrable low-pass filter, the stereo decoder includes a time-discrete halfband low-pass filter circuit having a finite impulse response, with a transition band which is substantially located in the frequency range of said modulated stereo difference signal and with a half-value transfer which is located at the frequency of said 38 kHz stereo subcarrier. The filter circuit has a substantially linear amplitude transfer characteristic as well as a linear phase transfer characteristic in the transition band. The receiver also includes an interpolation circuit which is coupled to an output of the filter circuit for converting time-sequential even and odd sampling values of the output signal of the filter circuit into time-sequential pairs of simultaneously occurring sampling values, and a dematrixing circuit coupled to the interpolation circuit for a linear combination of said pairs of sampling values and a compensation of the crosstalk between the left and right stereo signals caused by the filter circuit.

REFERENCES:
patent: 4630299 (1986-12-01), Welles, II et al.
patent: 4827515 (1989-05-01), Reich
patent: 5054070 (1991-10-01), Eckstein et al.

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