US 5,400,149 A · Magnetic recording apparatus having improved detail emphasis circuit

Abstract

A magnetic recording/reproducing apparatus, which includes: a reproduced level detector for detecting the level of a reproduced signal and a memory for storing the reproduced level detected by the detector; and when recording a video signal, the signal is recorded and reproduced in advance, and this reproduced level is stored in the memory, so that an amount of emphasis of a detail emphasis circuit in a reproducing system and an amount of equalization of an FM equalizer in the recording system can be controlled in accordance with the stored reproduced level; while when reproducing the video signal, the level of a reproduced FM luminance signal is detected by the reproduced level detector, so that an amount of equalization of an FM equalizer, an amount of cancellation of a line noise canceler, and an amount of cancellation of a noise canceler in a reproducing system can respectively be controlled in accordance with the detected reproduced level; whereby the characteristic of a video tape can be controlled in accordance with the type thereof on an apparatus-wide and integrated basis.

Claims20

Dependent claims

A magnetic recording apparatus in which a luminance signal of a video signal to be recorded on a recording medium is subjected to frequency modulation and then to single side-band recording, said apparatus comprising:

means for recording said video signal on said recording medium and for reproducing said video signal from said recording medium;
a detail emphasis circuit for receiving a luminance signal of the video signal to be recorded and for providing an output signal in which a small-amplitude component of a high frequency component of the luminance signal is emphasized;
and
means for detecting an amplitude of a first portion of said video signal reproduced from the recording medium and for generating and storing in a memory a detection value indicating said amplitude of said first portion, said detection value being provided to said detail emphasis circuit to control a mode of emphasis of said detail emphasis circuit, wherein said detection value is maintained in said memory at least until said recording medium is removed from said apparatus.

1 more element

means for recording said video signal on said recording medium and for reproducing said video signal from said recording medium;
means for detecting an amplitude of a first portion of said video signal reproduced from the recording medium, for generating and storing in a memory a detection value indicating said amplitude of said first portion, and for outputting said detection value, wherein said detection value is maintained in said memory at least until said recording medium is ejected from said apparatus;
and
a detail emphasis circuit for receiving said detection value and a luminance signal of the video signal to be recorded and for providing an output signal in which a small-amplitude component of a high frequency component of the luminance signal is emphasized, said detail emphasis circuit comprising:
means for determining a grade type of said recording medium by comparing said detection value with a predetermined threshold value and generating an output, and
control means for controlling a mode of emphasis of said detail emphasis circuit in accordance with said output of said grade type determining means.

3 more elements

Dependencies are inferred from the claim text.

Magnetic recording apparatus having improved detail emphasis circuit

Life of this patent

Magnetic recording apparatus having improved detail emphasis circuit

Life of this patent

Abstract

Claims20