Data demodulation system

Details Data demodulation system Data demodulation system

1988-06-06

1990-11-06

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

341107, 364900, 3649555, H03M 742

Patent

active

049689851

ABSTRACT:
A data demodulator assigns a binary value to the signal recorded in a transition cell based on the amplitude of the signal in the transition cell, the amplitudes of the signal in adjacent transition cells and system experience in categorizing how recording non-linearities and system noise effect the signals. The demodulator samples a selected number of times the recorded signal in the transition cell for which a binary value is to be determined and the recorded signal in a selected number of transition cells adjacent to that cell. It then converts the amplitude of each of the signal samples to a digital symbol. Next, it concatenates portions of the digital symbols to form an interpretation word. It uses this word to enter a stored lookup table which contains binary values, and assigns to the transition cell signal the binary value associated with the word. The table associates a value with a particular word or group of words based on system experience and the demodulation of known signals into interpretation words. The binary values assigned to a number of cells may be combined to form a code word which may be decoded and corrected using soft decoding techniques.

REFERENCES:
patent: 4309772 (1982-01-01), Kloker et al.

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