Data conversion apparatus

Details Data conversion apparatus Data conversion apparatus

1994-02-09

1996-04-23

Pellinen, A. D.

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

341 59, 341 65, 341102, 360 40, H03M 742

Patent

active

055107885

ABSTRACT:
An apparatus for converting source data into modulation data includes a compressed look-up table based on a conversion correlation, a non-effective data discriminator, a group discriminator, an output flag generator, a flag modulator, a control signal generator and an output compensator. A first address having the source data and a original input flag and a second address having the source data and a modulated input flag are sequentially applied to the look-up table which in turn generates first tentative data and a first tentative flag with respect to the first address, generates second tentative data and a second tentative flag with respect to the second address, and produces unique non-effective data when non-effective data is applied. The group discriminator produces a group discrimination signal based on the source data, the non-effective data discriminator produces a non-effective data detection signal when the first tentative data is non-effective data, the output flag generator produces an output flag based on one of the tentative flags and the non-effective data detection signal, and the flag modulator sequentially produces the original input flag and the moduated input flag based on the non-effective data detection signal and output of the output flag generator. The control signal generator produces a control signal based on the non-effective data detection signal and the group discrimination signal. The output compensator produces the modulation data, by modulating the second tentative data in accordance with the control signal.

REFERENCES:
patent: 5025256 (1991-06-01), Stevens
patent: 5142421 (1992-08-01), Kahlman

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