Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Control of information signal processing channel
Reexamination Certificate
2009-07-27
2011-10-25
Criado, Jorge Ortiz (Department: 2627)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Control of information signal processing channel
C369S047170, C369S124120
Reexamination Certificate
active
08045431
ABSTRACT:
In the multi-tone demodulation (MTD) technique, even if an input bandwidth is widened to obtain a larger SNR gain, an increase in the signal to noise ration (SNR) gain cannot always be obtained due to clock jitter that increases clock noise. Also, noise is sometimes superimposed on the clock supplied to an analog to digital converter circuit (ADS) and the noise lowers the performance. Accordingly, the optical disc apparatus loosely regulates the bandwidth of a pulsed read signal; boosts the high-frequency components of a waveform of a driving signal of a laser diode; and synchronizes autonomously a driving clock of the ADC and a digital to analog converter circuit (DAC) with a clock of the pulsed read signal.
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patent: 2008/0219132 (2008-09-01), Kikugawa
patent: 2009/0103418 (2009-04-01), Kikugawa
patent: 06004810 (1994-01-01), None
patent: 2007-73147 (2007-03-01), None
A. Arimoto et al., Noise Reduction of Diode Laser Video Disc Players with High Frequency Current Superposition, Optics, vol. 14, No. 5, Apr. 24, 1985, pp. 377-384.
F. Op'T Eynde et al., Analog Interfaces for Digital Signal Processing Systems, Kluwer Academic Publishers, 1993, pp. 91-92.
A. Kikukawa et al., Novel HF-pulse read signal converter for increasing read signal SNR, Digest of International Symposium on Optical Memory 2007, pp. 302-303.
Criado Jorge Ortiz
Hitachi Consumer Electronics Co., Ltd.
Mattingly & Malur, PC
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