Apparatus and method for automatically adjusting parameters of a

Details Apparatus and method for automatically adjusting parameters of a Apparatus and method for automatically adjusting parameters of a

1992-10-05

1994-11-29

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 14, H03H 740

Patent

active

053696670

ABSTRACT:
It is intended to converge parameters stably in a short time upon automatic adjustment of parameters of a bit identifier by which a signal reproduced from a magnetic recording medium and equalized by the Nyquist standard is compared with a threshold value and converted into a binary signal. An estimation value H(j) of an equalization error is cleared in step 1. Such estimation values H(j) are added in step 2 without being limited in the number of occurrences of addition. A result of the addition is compared with a converging coefficient M in step 3. As long as the result of the addition does not exceed the converging coefficient M, addition is repeated. When the result of the addition reaches the predetermined value, a fixed step .DELTA. is added to or subtracted from a parameter in response to the estimation value H(j). Therefore, parameter renewal interval is variable in response to the amount of equalization errors.

REFERENCES:
patent: 3611149 (1971-10-01), Kimball
patent: 4343041 (1982-08-01), Forney, Jr.
patent: 4608703 (1986-08-01), Kaga et al.
patent: 4759036 (1988-07-01), Meyers
patent: 5313472 (1994-05-01), Hara
Record of Supercomm/ICC '90 vol. 2, No. 305, 15 Apr. 1990, Atlanta, Ga., US pp. 397-403.
Electronics Letters vol. 26, No. 1, 4 Jan. 1990, Stevenage, Herts., GB pp. 13-15.

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