PRML


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PRML

PRML

(Partial Response Maximum Likelihood) A technique used to differentiate a valid signal from noise by measuring the rate of change at various intervals of the rising waveform. Bits generated by a modem or by reading a hard disk have uniform characteristics, whereas random noise does not. PRML uses digital signal processing (DSP) to reconstruct the data.

On magnetic disks, PRML increases the number of bits that can be recorded over earlier methods. It uses an RLL encoding sequence of 0,4,4 and provides an 8:9 ratio of user data to recorded data. See RLL.
References in periodicals archive ?
Early actions signaled that Deby, in fact, would be accountable to the few rather than the many, as he manipulated the PRML to the advantage of northern and eastern Muslims and particularly his own Zaghawa clan.
Advanced PRML enables greater capacity and performance through high encoding efficiency recording densities to significantly increase transfer rates.
On the other hand, Oak has licensed Samsung Electronics' PRML (Partial Response Maximum Likelihood) read channel and RF-Amp technology, which the Korean chipmaker has already implemented for internal use.
1990 First HDD with PRML encoding IBM 0681 "Redwing"