US 6,480,668 B1 · Signal processing circuit

Abstract

A recording apparatus operates in any one of a standard mode and a high-quality mode. The apparatus records a video signal of a standard format during the standard mode of operation. The apparatus records a video signal of a high-quality format during the high-quality mode of operation. A signal processing circuit for use in the apparatus includes a first device for subjecting a first signal to a nonlinear emphasis process to convert the first signal into a second signal. A second device operates for selecting one of the first signal and the second signal in response to whether the apparatus operates in the standard mode or the high-quality mode, and for outputting the selected signal as a third signal. A third device operates for subjecting the third signal to a nonlinear de-emphasis process to convert the third signal into a fourth signal. A fourth device operates for selecting one of the third signal and the fourth signal in response to whether the apparatus operates in the standard mode or the high-quality mode, and for outputting the selected signal as a fifth signal. A fifth device operates for separating a sync signal from the fifth signal. During the standard mode of operation of the apparatus, the first device selects the first signal, and the fourth device selects the third signal. During the high-quality mode of operation of the apparatus, the first device selects the second signal, and the fourth device selects the fourth signal.

Claims3

Dependent claims

A signal processing circuit for use in a recording apparatus which operates in any one of a standard mode and a high-quality mode, the apparatus recording a video signal of a standard format during the standard mode of operation, the apparatus recording a video signal of a high-quality format during the high-quality mode of operation, wherein the video signal of the high-quality format is wider in frequency band than the video signal of the standard format, the circuit comprising:

first means for subjecting a first signal to a nonlinear emphasis process to convert the first signal into a second signal;
second means for selecting one of the first signal and the second signal in response to whether the apparatus operates in the standard mode or the high-quality mode, and for outputting the selected signal as a third signal;
third means for subjecting the third signal to a nonlinear de-emphasis process to convert the third signal into a fourth signal, the nonlinear de-emphasis process being inverse with respect to the nonlinear emphasis process;
fourth means for selecting one of the third signal and the fourth signal in response to whether the apparatus operates in the standard mode or the high-quality mode, and for outputting the selected signal as a fifth signal;
and
fifth means for separating a sync signal from the fifth signal;
wherein during the standard mode of operation of the apparatus, the first means selects the first signal, and the fourth means selects the third signal;
and
wherein during the high-quality mode of operation of the apparatus, the first means selects the second signal, and the fourth means selects the fourth signal.

6 more elements

Dependencies are inferred from the claim text.

Signal processing circuit

Life of this patent

Signal processing circuit

Life of this patent

Abstract

Claims3