Device for determining pick-up head tracking error in a digital tape player
AssigneeYamaha Corporation
InventorMasao Noro
Life of this patent
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Abstract
An analog-to-digital converter suitable for digitalizing signals used in an automatic track finding mechanism of a digital audio tape-recorder. The A/D converter comprises a sampling clock generation circuit for generating a sample clock in synchronism with an input signal and an analog-to-digital conversion circuit for analog-to-digital converting an amplitude peak value of the input signal at a timing of the sampling clock. The A/D converter is samplified in structure, for the sampling clock for sample holding does not have to be quartz oscillated but only needs to be a signal synchronous to the input signals.
Claims6
A device for determining pick-up head tracking error in a digital tape player which uses tape having plural parallel tracks recorded diagonally across the tape comprising:
- a pick-up head for reading from the tape a pilot signal of multiple cycles;
- conversion means for sampling the pilot signal during each cycle thereof to obtain a single analog signal proportional to the peak value of each cycle of the pilot signal and for converting each analog signal to a digital signal representative of each peak value;
- sampling clock generation means for generating a sampling clock in synchronism with the pilot signal to control the timing of the sampling of the pilot signal by the conversion means;
- and
- means of determining pick-up head tracking error based on the digital signal.
A device for determining pick-up head tracking error in a digital tape player which uses tape having plural parallel tracks recorded thereon comprising:
- a pick-up head for reading pilot signals, each having multiple cycles, from adjacent tracks;
- conversion means for sampling the pilot signals during each cycle thereof to convert selectively the peak value of each cycle from analog to digital form;
- timing means for synchronizing with the pilot signal the sampling of the pilot signal by the conversion means;
- and
- means for determining pick-up head tracking error based on the digital form of the peak values corresponding to pilot signals read from the adjacent tracks.
A device for determining pick-up head tracking error in a digital tape player which uses tape having plural parallel tracks recorded thereon comprising:
- a pick-up head for reading a pilot signal from a track;
- conversion means for sampling the pilot signal to identify the peak value of each cycle of the pilot signal and for converting only the peak value of the pilot signal from analog to digital form;
- timing means for synchronizing the sampling of the pilot signal by the conversion means with the pilot signal;
- and
- means for determining pick-up head tracking error based on the digital form of the peak value.
Dependencies are inferred from the claim text.