Automatic tracking frequency servo demodulation technique for DV

Details Automatic tracking frequency servo demodulation technique for DV Automatic tracking frequency servo demodulation technique for DV

1997-10-17

1999-11-09

Klimowicz, William J.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7715, G11B 5584

Patent

active

059825740

ABSTRACT:
An apparatus for demodulating two pilot tones for use by a servo control for a magnetic read head is disclosed. The apparatus provides positioning information to position the read head adjacent to a desired information track of a magnetic storage medium. The apparatus comprises a first and a second pilot tone demodulation unit. Each pilot tone demodulation unit comprises a band pass filter for providing a first filtered output signal having an amplitude and a phase representative of the first and the second frequency pilot tones, respectively. A delay lock loop receives the first filtered out of the band pass filter and determines a phase of the frequency pilot tone. A multiplier is connected to the output of the band pass filter and the output of the delay lock loop for multiplying the frequency pilot tone with the output signal of the delay lock loop. A low pass filter is connected to the output of the multiplier for filtering out undesired signals and for passing a DC signal. A comparator is used for comparing the first DC signal to the second DC signal and for determining a position of the magnetic read head with respect to a track of a magnetic storage medium.

REFERENCES:
patent: 4172265 (1979-10-01), Sakamoto et al.
patent: 4300020 (1981-11-01), Toyomaki
patent: 4694326 (1987-09-01), Demmer
patent: 5588025 (1996-12-01), Strolle et al.
patent: 5621478 (1997-04-01), Demmer
patent: 5854714 (1998-12-01), Reed et al.

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