Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-07-03
1998-12-08
Swann, Tod R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 32, 369 54, 369 59, G11B 700, H03L 708
Patent
active
058480471
ABSTRACT:
An A/D converter supplies an interpolation circuit with sampled values which are obtained by sampling a playback signal coming from a read-out device in synchronization with a system clock signal. In the interpolation circuit, the value of the playback signal at the time the phase of a PLL clock phase signal P supplied by a PLL clockphase signal generator becomes zero is computed from the sampled values by using a linear interpolation technique. The interpolation value is then supplied to a binary conversion circuit and fed back to a phase error detecting circuit. The binary conversion circuit converts the interpolation value of the playback signal into a binary value which is then supplied to a circuit at the following stage. The phase error detecting circuit detects a zero cross of the interpolation value of the playback signal. The zero cross timing is then used for computing a phase error signal which is then output to the PLL clock phase signal generator by way of a loop filter. The PLL clock phase signal generator generates the PLL clock phase signal P which is supplied to the interpolation circuit as described above.
REFERENCES:
patent: 4672597 (1987-06-01), Yamazaki
patent: 4704711 (1987-11-01), Gerard et al.
patent: 5440532 (1995-08-01), Yokogawa et al.
Chu Kim-Kwok
Sony Corporation
Swann Tod R.
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