Header detector and associated decoding apparatus

Details Header detector and associated decoding apparatus Header detector and associated decoding apparatus

1994-12-27

1996-10-22

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

H03M 740

Patent

active

055681409

ABSTRACT:
A code sequence includes a header code consisting of a series n 0 bits terminated by a 1 bit. A shifter outputs the code sequence in bit strings. Each bit string is made up of plural bits. A priority encoder performs arithmetic operation to count the number of consecutive 0 bits from the most significant bit of each bit string. An accumulator adds the results found by the priority encoder. A comparator compares the sum found by the accumulator with a set value n. The comparator outputs a coincidence signal if these two values are found equal. The priority encoder outputs a 1-bit-inclusion indication signal if a bit string includes a 1 bit. Upon receipt of the coincidence signal and the 1-bit-inclusion indication signal, a first AND circuit outputs a header detection signal. As a result of such arrangement, the code sequence is processed in units of plural bits, whereupon high-speed header code detection is accomplished without requiring the shifter and the accumulator, both of which are components of a header detector, to operate at high speed.

REFERENCES:
patent: 4899149 (1990-02-01), Kahan
patent: 5245338 (1993-09-01), Sun

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