Gray code decoding circuit of a hard disk drive

Details Gray code decoding circuit of a hard disk drive Gray code decoding circuit of a hard disk drive

1997-05-09

1999-07-06

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 49, 360 46, 360 7708, G11B 509

Patent

active

059204400

ABSTRACT:
A gray code decoding circuit of a hard disk drive includes a servo pattern area, a data pick-up device, and a pattern detecting device. The servo pattern area has data recorded as a gray code. The data pick-up device detects the recorded data, converts it into encoded read data, and outputs the encoded read data. The pattern detecting device detects a position of the servo pattern area in response to the encoded read data and outputs a reference pulse. The gray code decoding circuit also contains a gray window generating device, a synchronous signal generating device, a gray code extracting device, and a gray-binary converting device. The gray window generating device divides the encoded read data by a division ratio, converts the divided encoded read data into gray data, outputs the gray data, and generates a first synchronous signal after counting by a system clock to a first value. The synchronous signal generating device outputs first and second window signals in response to a second synchronous signal. The gray code data extracting device outputs the second synchronous signal to the synchronous signal generating device and outputs first and second information data taken from the gray data in response to the first and second window signals, respectively. The gray-binary converting device converts the gray code of the first and second information data to a binary code.

REFERENCES:
patent: 5442499 (1995-08-01), Emori

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