Method and apparatus for sampled-data partial-response signal ti

Details Method and apparatus for sampled-data partial-response signal ti Method and apparatus for sampled-data partial-response signal ti

1996-02-16

1998-09-08

Baker, Stephen M.

Excavating

360 51, 375376, H04L 25497, G11B 2719

Patent

active

058056190

ABSTRACT:
Apparatus and method for sampling a partial response input signal including a signal sampler for generating a sampled digital signal representation of a sampled analog signal in response to a sample-time control signal, and a timing error detector having an input port receiving the digital signal and generating a timing error control signal at an output port. The timing error control signal is a function of the non-return to zero (NRZ) sequence which was originally recorded or otherwise transmitted or communicated, the synchronous sampled data value, the estimated ideal partial response sample value, and the timing error estimate. A voltage controlled oscillator (VCO) receives the timing error control signal and generates the sample time control signal. Several multi-level data estimators are described. Capability to perform digital signal processing at the incoming data rate is provided so that the approach can be used in a real-time hardware testing environment suitable for data reception over a communication channel, and finds particular utility for magnetic disk data read channel testing. The timing error detector also estimates a binary data value based on the non-return to zero (NRZ) sequence, rather than on an amplitude sequence as are some conventional partial response signal detection algorithms.

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