JPH01208702A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a magnetic recording and reproducing device which is free from inversion on its black-and-white screen by detecting a component which is different from the frequency component of the reproduced signals reproduced by its own device from reproduced signals and correcting the frequency and phase characteristics of the reproduced signals in accordance with the detected frequency component. CONSTITUTION:A frequency component detector 9 which detects a frequency component peculiar in the reproduced signals reproduced by another device from reproduced signals extracts frequency components f1-f3 which appear in accordance with the equalizer characteristic at the time of recording. By actuating frequency characteristic correcting amplifiers 31-33 and phase correctors 40-43 respectively corresponding to switches, the equalizer characteristic of the equalizer circuit 3 at the time of reproduction by another device is caused by compensate the equalizer characteristic at the time of recording. Therefore, at the time of reproduction by its own device only an equalizer amplifier 30 and phase corrector 40 are actuated to compensate the equalizer characteristic at the time of recording by its own device and, at the time of reproduction by another device, the equalizer characteristic of the reproduced signals are switched by discriminating the equalizer characteristic at the time of recording and the equalizer characteristic is compensated. Therefore, high-quality reproduced video signals which are free from white-black inversion are obtained in the case of not only the reproduction by its own device, but also the reproduction by another device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reproduced video signal processing circuit for a magnetic recording/reproducing device.

[Prior Art] Figure 2 is a block circuit of a reproduced signal processing circuit of a conventional magnetic recording/reproducing device.In Figure 0, (1) is a reproduction head, (2) is a head preamplifier circuit, and (3) is an equalizer circuit. , (4) is a limiter circuit, (5) is an FM demodulation circuit,
(8) is a luminance signal processing circuit, (7) is a band pass filter (hereinafter referred to as rBPFJ) for extracting a low frequency converted color signal, and (8) is a color signal processing circuit.

Next, the operation will be explained. A video signal recorded on a magnetic tape (10) is detected by a reproducing head (1) and amplified by a head preamplifier circuit (2). This reproduced signal is branched into two, and one of the reproduced signals is divided into two by an equalizer circuit (
In step 3), the frequency characteristics and phase characteristics are corrected, and the signal is manually inputted to the luminance signal processing circuit (6) via the next-stage limiter circuit (4) and FM demodulation circuit (5), and a luminance signal is output.

A low frequency converted color signal is extracted from the other reproduced signal by a BPF (7), and is input to a color signal processing circuit (8), where the color signal is output.

[Problems to be Solved by the Invention] Since the reproduction signal processing circuit of a conventional magnetic recording and reproducing device is configured as shown in E, when reproducing a magnetic tape (10) recorded with another magnetic recording device, Since the equalizer characteristics during recording (hereinafter referred to as "other self-recording/playback") are different from those during self-recording/playback, there may be cases where the recording characteristics and playback characteristics do not match, resulting in black and white inversion phenomena, etc. There was a problem that high-quality video playback was not possible.

This invention was made in order to eliminate the above-mentioned problems, and provides a magnetic recording and reproducing apparatus equipped with a reproduction signal processing circuit that can change the equalizer characteristics during reproduction according to the equalizer characteristics during recording. The purpose is to obtain.

[Means for Solving the Problems] A magnetic recording and reproducing apparatus according to the present invention includes means for detecting a frequency component different from that in self-recording and reproducing that appears in the reproducing signal in the case of self-recording and reproducing during reproduction; The present invention is characterized in that it includes equalizer characteristic correction means for correcting the frequency characteristics and phase of the reproduced signal according to the detection signal.

[Operation] The frequency component detecting means in the present invention detects a unique frequency component generated by the equalizer characteristics at the time of recording in the case of self-recording/playback. The equalizer characteristic correction means corrects the frequency characteristics and phase characteristics of the reproduced signal in accordance with the detected signal so that they approach the characteristics in the case of self-recording/playback.

[Embodiment of the invention] Fig. 1 is a block circuit diagram of an embodiment of the invention.
The same reference numerals as those in the figures indicate the same or corresponding parts.

In the figure, the equalizer circuit (3) is an equalizer amplifier (30) that determines the equalizer characteristics in the case of self-recording and playback.
and a phase corrector (4θ) and an equalizer amplifier (30
), switches (51), (52) and (
first to third frequency characteristic correction amplifiers (3t), (32) and (3t) connected in parallel via
33) and the 1-phase corrector (40), respectively.
1), (62) and (63), the first to third phase correctors (41), (
42) and (43). (9) is a frequency component detector that detects a unique frequency component that appears in the case of self-recording and playback from a reproduced signal; 1 to 3rd band pass filter (
(hereinafter referred to as "rBPF") (11), (12) and (13), and each B P F (11), (12)
and (13), which outputs operation command signals (91), (92), and (93).
or a third comparator (21), (22) and (23), and an operation command signal (91)
, (92) and (83) are the corresponding switches (51) and (61), (52) and (62), respectively.
, (53) and (63), and operate the frequency characteristic correction amplifier and phase corrector corresponding to the respective switches to adjust the frequency characteristics of the equalizer amplifier (30) and the phase correction type of the phase corrector (40). Supplement the
In addition, the equalizer characteristics of the equalizer circuit (3) during self-recording and reproduction are configured to compensate for the equalizer characteristics during recording.

Therefore, in this embodiment, in the case of self-recording and reproducing, only the equalizer amplifier (30) and the phase corrector (40) operate to compensate for the equalizer characteristics during self-recording, and in the case of self-recording and reproducing, At least one operation command signal is output by discriminating the equalizer characteristics during recording, and the equalizer characteristics of the playback signal are cut to compensate, so both black and white can be obtained not only in the case of self-recording and playback, but also in the case of self-recording and playback. A high-quality reproduced video signal without occurrence of inversion etc. can be obtained.

In the above embodiment, three systems of equalizer characteristic correction circuits are provided, but more systems may be provided.

Conversely, a simple configuration with one or two systems may be used.

[Effects of the Invention] As described above, according to the present invention, even in the case of self-recording and reproduction, the reproduced signal can be corrected using equalizer characteristics that match the equalizer characteristics at the time of recording.

This has the effect of providing a magnetic recording/reproducing device that does not cause black-and-white screen inversion.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block circuit diagram of a reproduction signal processing circuit of a conventional video recording/reproducing apparatus. (1)...Playback head, (2)...Head preamplifier circuit, (3)...Equalizer circuit, (8)...Frequency component detector, (11), (12), (13)
)...Band pass filter, (21), (22)
, (23)...Comparator, (30)...Equalizer amplifier, (31), (32), (33
)...Frequency characteristic correction amplifier, (40), (4
1), (42), (43)...phase correction amplifier, (51), (52), (53), (6
1), (62), (63)...switch. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] (1) Means for detecting a frequency component different from the frequency component of the reproduced signal for self-recording and playback from the reproduced signal, and equalizer characteristic correction for correcting the frequency characteristics and phase characteristics of the reproduced signal according to the frequency component detected by this means. A magnetic recording and reproducing device comprising means.