JPH0822655A - Magnetic reproducing device - Google Patents

Abstract

PURPOSE:To inexpensively provide the constitution for changing the characteristic of a reproduced signal system complied with the change of the output level of a reproducing signal due to the performance of a tape, the recording condition and the past reproducing condition in a magnetic reproducing device for a VTR, etc. CONSTITUTION:A detecting circuit 14 for detecting the level of a reproducing signal used for tracking adjustment is also used as the detection of the level of a reproducing signal for changing e.g. the characteristics of a deemphsis circuit 46 and a noise suppressing circuit 48 of the reproducing signal system according to the performance of a tape T, etc. When the reproducing signal level is changed more to some extent, an updating means for changing a signal for controlling the characteristic of the reproducing signal system is provided and a means for performing the tracking adjustment over again is similarly provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic reproducing apparatus, and more particularly, to a characteristic of a signal processing circuit of a reproducing signal system, which is a VTR (including a reproducing-only device) for reproducing a video tape, according to a reproducing signal output level. Etc. relating to those having a function of controlling such.

[0002]

2. Description of the Related Art Recording and recording video and audio signals
Household VTRs for reproduction have been widely spread, centering on the VHS (registered trademark) system. Video tapes (hereinafter also simply referred to as tapes) as magnetic recording media used for such VTRs have been improved in performance in recent years, and even tapes used for VTRs of the same format are inexpensive and meet minimum performance. There is a large difference (for example, 2.5 to 6 dB) in the output level of the reproduction signal between the tape and the high-performance tape.
There is a degree). The difference between the reproduction signal output levels is the S / N
Although it appears as a difference in the margin of the ratio, it is usually designed to obtain a reproduced image of a predetermined S / N ratio or more even with a tape having the minimum performance in the reproduction signal system, so a high performance tape is used. Even though the S / N ratio is further improved, there is a problem that the image is not different from the image when an essentially inexpensive tape is used. In order to improve this, for example, JP-A-2-
As disclosed in Japanese Patent No. 18755, the reproduction output level is detected, and the characteristics of several signal processing circuits of the reproduction system are controlled according to the result, and the tape is adjusted in terms of S / N ratio, sharpness, detail reproducibility, etc. A technique for making full use of the ability of the tape by obtaining a well-balanced reproduced image has been proposed.

[0003]

However, in order to automatically change the characteristics of the reproduction signal system according to the performance of the tape, it is necessary to add a reproduction signal level detection circuit. This is against the demand that the increase in the number of components and circuits should be suppressed as the price of VTR has been further reduced in recent years, resulting in an increase in cost.

Therefore, according to the present invention, the characteristics of the reproduction signal system are adjusted in accordance with the performance of the tape and the change of the reproduction signal output level depending on the recording or past reproduction mode by suppressing the increase of the circuit which causes the cost increase as much as possible. An object of the present invention is to provide a magnetic reproducing device having a configuration for changing.

[0005]

In order to achieve the above object, according to the present invention, a reproduction signal level detecting circuit conventionally used for tracking adjustment is provided in a reproduction signal system according to the performance of a tape. The configuration is also used for detecting the reproduction signal level for changing the characteristics. Further, it is possible to provide updating means for changing the signal for controlling the characteristics of the reproduction signal system when the reproduction signal level changes to some extent or more. Further, it is possible to provide a means for performing control so that the tracking adjustment is performed again when the reproduction signal level further changes.

That is, according to the present invention, a reproducing head means for reading and reproducing the information signal recorded on the magnetic recording medium, and a reproducing signal level detecting circuit for detecting the level of the information signal reproduced by the reproducing head means, Magnetic reproduction having automatic tracking means for automatically performing tracking adjustment according to the output signal of the reproduction signal level detection circuit and a reproduction signal system signal processing circuit for processing the information signal reproduced by the reproduction head means. In the apparatus, there is provided control signal generating means for obtaining a control signal for controlling the signal processing circuit of the reproduction signal system according to the level of the detected reproduction signal by using the output signal of the reproduction signal level detection circuit. There is provided a magnetic reproducing device characterized by the above.

Further, according to the present invention, reproducing head means for reading and reproducing the information signal recorded on the magnetic recording medium,
A reproduction signal level detection circuit for detecting the level of the information signal reproduced by the reproduction head means, an auto tracking means for automatically performing tracking adjustment according to an output signal of the reproduction signal level detection circuit, and the reproduction head In a magnetic reproducing device having a reproduction signal system signal processing circuit for processing the information signal reproduced by the means, using an output signal of the reproduction signal level detecting circuit,
Control signal generating means for obtaining a control signal for controlling the signal processing circuit of the reproduction signal system according to the level of the detected reproduction signal; and a tracking adjustment amount to be adjusted by the auto-tracking means. Level change detection means for detecting that the level of the reproduction signal detected by the reproduction signal level detection circuit has changed to a predetermined value or more or a predetermined rate or more after the control signal generation means has generated the control signal; A magnetic reproducing apparatus comprising: an updating unit that changes the control signal when the level of the reproduction signal changes to the predetermined value or more or a predetermined rate or more in response to the output signal of the level change detecting unit. Provided.

[0008]

Therefore, according to the magnetic reproducing apparatus of the first aspect, the reproducing signal level detecting circuit is also used as the control signal generating means for producing the control signal to be supplied to the signal processing circuit of the reproducing signal system and the auto tracking means. Therefore, the circuit configuration is simple, and it is possible to obtain an appropriate reproduction state according to the performance of the tape while suppressing the cost increase.

According to another aspect of the magnetic reproducing apparatus of the present invention, there are a plurality of programs recorded in different VTRs on one tape, for example, and these are continuously reproduced, or one program contains one program. Since only a specific part was repeatedly reproduced in the past, if the reproduction signal output level of that part is lower than before and after that, the signal controlling the characteristics of the reproduction signal system is updated according to the reproduction signal output level. Therefore, the quality of the reproduced image does not change significantly, and the user can view the image of the reproduced program without feeling uncomfortable. Further, according to the magnetic reproducing apparatus of the third aspect, when the change of the reproduction output level is large, the tracking adjustment is performed again, so that the stable reproduction can be performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of essential parts of a preferred embodiment of a magnetic reproducing apparatus of the present invention. A circuit diagram of a VTR to which the present invention is applied is shown in FIG. 3 described later. The switch SW has contacts connected to the input terminal 10 for the reproduced FM luminance signal and the input terminal 12 for the reproduced FM audio signal, respectively, and a switch control signal from the microcomputer 16 causes the switch SW to switch between these two input signals. One of them is selected and supplied to the reproduction signal level detection circuit 14. The reproduction signal level detection circuit 14 has an envelope detection circuit and detects the envelope of the input signal and outputs a DC level signal corresponding to the signal amplitude.
The DC level signal is input to the microcomputer 16 and the microcomputer 1
It is converted into a digital signal by an A / D converter (not shown) in 6 and stored in a memory (not shown).

The microcomputer 16 outputs two flag signals, a control signal given to the servo circuit 18 and an A rank flag and a C rank flag given to the logic circuit 26. The servo circuit 18 is for performing tracking control of a known rotary scan rotary magnetic head. On the other hand, the logic circuit 26 produces a control signal for controlling a signal processing circuit of a reproduction signal system which will be described later.
6 and 6 to operate as control signal generating means. The SP flag given to the logic circuit 26 is a flag indicating that the tape is reproduced at the standard tape traveling speed in the standard reproduction, that is, the normal reproduction mode.

In FIG. 1, four control signals X, Y, U, and V are output from the logic circuit 26, and these are used in the signal processing circuit of the reproduction signal system described below. Before describing the signal processing circuit of the reproduction signal system, the entire reproduction system will be described with reference to FIG. 3 showing a block diagram of the reproduction system of a typical VTR. The magnetic head 30 reproduces the recorded video signal from the magnetic tape T, and the preamplifier 32
Supply to. The output signal of the preamplifier 32 is the HPF 34,
The signal is supplied to the FM demodulator 42 through the AGC circuit 36, the equalizer 38, and the limiter 40 in order, and the FM demodulation is performed. The output signal of the FM demodulator 42 is given to the adder 52 via the LPF 44, the de-emphasis circuit 46, and the noise suppression circuit 48. On the other hand, the output signal of the preamplifier 32 is given to the adder 52 via the color signal reproduction processing circuit 50, and with such a configuration, the reproduction FM luminance signal (Y signal) and the color signal reproduction processing circuit 50 which are the output signals of the noise suppression circuit 48. The chroma signal (C signal), which is the output signal of, is added and output from the output terminal 54 as a reproduced composite video signal.

Next, an example of a circuit for changing the characteristics of the reproduction signal system, particularly the reproduction luminance signal system according to the reproduction signal level from the tape T will be described. The FM instantaneous frequency at the sync tip level is 3.4 MHz,
FM instantaneous frequency at 100% white level is 4.
It is assumed that the information signal recorded on the tape T is reproduced by FM modulation such as 4 MHz. The luminance signal system in the reproduction system of FIG. 3 is considered to be divided into two before and after the FM demodulator 42.

FIG. 4 is a circuit diagram showing a specific example of the equalizer 38 shown in FIG. 3 as an example of switching the circuit characteristics in front of the FM demodulator 42 according to the performance of the tape T and the like. In FIG. 4, the transistors Trx and Try are transistor elements having a built-in base resistance (for example, a product name “digital transistor” manufactured by ROHM Co., Ltd.).

Now, the performance of the video tape is divided into three ranks according to the reproduction output level of the FM luminance signal by a method which will be described later, and the reproduction output levels are A, B, and C in descending order. In the equalizer 38 of FIG. 4, the control signals X, Y
Are set as shown in Table 1 (H indicates a high level and L indicates a low level).

[0016]

[Table 1]

First, in the case of the C rank, the transistors Trx and Try are both turned off. At this time, for example, in a parallel resonance circuit including a coil L12 and a capacitor C12,
If a constant is determined so that peaking around 4.5 MHz and peaking around 5 MHz with a series resonance circuit composed of a coil L13 and a capacitor C13, the frequency of the equalizer 38 as a whole will be combined with the high-pass characteristics of the resistor R11 and the coil L11. The characteristics are as shown by the curve F in FIG. Next, in the case of A rank and B rank, the transistor T
The rx is turned on, and the coil L1x is connected in parallel with the coil L12. As a result, the peaking frequency of the parallel resonant circuit formed by the combined inductance and the capacitor C12 moves to a high range and becomes, for example, 5.3 MHz. For the B rank, the transistor Try remains off, so the change in the characteristics with respect to the C rank is only due to this.
It becomes like a curve E in FIG. Curves E and F in Figure 5
Comparing the characteristics of, the curve F has a peak at 4 to 4.5 MHz and is attenuated at 5 MHz or more. Therefore, for example, in the gray flat portion where the FM carrier frequency is 4 MHz, the noise components in the bands on both sides of the flat portion are attenuated, and the image has a good S / N ratio. Immediately after the rising edge from black to white, a waveform with a beard extending to the high level side appears at the input of the recording FM modulator due to the emphasis during recording (waveform diagram in the lower part of FIG. 5). The instantaneous frequency is 5.3 MH, for example.
It becomes a high frequency such as z. As a result, in the characteristic of the curve F, the carrier component (5.3 MHz) at this point
On the other hand, since the level of the noise component around 4.5 MHz becomes relatively large, the edge S / N becomes worse. On the other hand, the characteristic of the curve E in FIG. 5 is 4.0 to 5.5 MHz.
A smooth peak is formed in the vicinity, and the noise in the bands on both sides of the flat part of the gray is not greatly attenuated as in the case of the characteristic of the curve F, but the above-mentioned immediately after the edge from black to white The deterioration of the S / N ratio is also reduced. That is, the reproduction output is small and the flat part S
For tapes with a poor N / N ratio, even if the S / N ratio of the edge is sacrificed to some extent, the characteristics are such that the S / N ratio of the flat part is improved so that an image that is easy to see as a whole is obtained, and the reproduction output is not so great. For tapes that are not small, the flat part S
Since there is some margin in the / N ratio, it is possible to obtain a reproduced image with higher image quality by setting the characteristics in the direction of improving the S / N ratio of the edge.

Further, in the case of a tape having a high reproduction output, it is judged to be A rank, and the transistor Tr1y is turned on in addition to the transistor Trx. At this time, the coil L11
A series circuit of a capacitor C1y and a resistor R1y is added in parallel with the resonance frequency 1 / of the coil L11 and the capacitor C1y.
By selecting the constant so that 2π (L11C1y) ^1/2 is around 2 MHz, for example, the resonance is largely damped by the resistor R1y, but the curve D in FIG. Characterized. In this way, by increasing the level of the frequency component corresponding to the sideband of the luminance signal FM signal relatively to the level of the FM carrier, a high sharpness image in which many high frequency components after demodulation are reproduced Can be obtained.

The above is an example of circuit switching for the reproduced FM luminance signal before the FM demodulator. An example of switching after FM demodulation will be described below. First, FIG. 6 shows an example of switching frequency characteristics after demodulation. Here, the resistors R1D, R2D and the capacitor C are used.
In the de-emphasis circuit 46 composed of 1D, a parallel resonance circuit composed of a coil L3D, a capacitor C3D and a resistor R3D is added. Here, when a high-level voltage is applied as the control signal U and the transistor Tru (similar to the digital transistor described above) is on, this parallel resonance circuit is short-circuited and can be ignored, so that the conventional de-emphasis characteristic is used. It becomes the characteristic only. When the voltage of the control signal U is at low level, the transistor Tru is turned off, and a parallel resonance circuit raises a high range (for example, 2 to 3 MHz) near the resonance frequency to obtain a sharp image.

Further, the reproduced signal system after demodulation generally includes a noise suppression circuit as shown in FIG. 7, for example. This circuit extracts a small amplitude component passing through the limiter 60 from the high frequency components extracted by the high frequency filter (HPF) 58, regards this component as noise, and subtracts it from the original signal. Although the S / N ratio is improved by this circuit, there is a problem in that the small amplitude detail originally possessed by the signal is also lost. In this circuit, a circuit including resistors R1N and R2N, a capacitor C1N, and a transistor Trv is added. Here, the capacitor C1N is a capacitor having a large enough capacity for cutting direct current. When the control signal V is low level and the transistor Trv is off, these additional circuits are ignored and the conventional subtraction is performed. When the control signal V is at a high level and the transistor Trv is on, the output signal of the limiter 60 is divided by the resistors R1N and R2N, so the degree to which the high-frequency small amplitude signal is subtracted from the original signal is small, and the S / N ratio is small. Although the effect of improving the ratio is small, it is possible to obtain an image in which fine details are well reproduced.

Here, as the control signals U and V input to the base terminals of the transistors Tru and Trv of FIGS. 6 and 7, for example, when the rank is A, the control signal U
Is at a low level, the control signal V is at a high level, and B and C are
In the case of rank, the control signal U is at high level and the control signal V is at low level. Here, in addition to the standard mode, a VT having a long time mode such as a triple mode with a narrow track width
In the case of R, the control voltages U and V are switched to the above level only in the standard mode in which the S / N ratio has a margin, and in the long time mode, the B and C ranks are also included in the A rank. It may be the same voltage as.
In order to perform such switching, it is necessary to detect the reproduction signal level from the tape T and perform rank classification.

FIG. 2 is a time-series procedure diagram schematically showing control of the magnetic reproducing apparatus in the embodiment of the present invention shown in FIG. Further, FIG. 8 is a flowchart showing a processing procedure of the microcomputer 16 for controlling the magnetic reproducing apparatus. When the VTR is in the reproduction state, the microcomputer 16 A / D converts the output signal of the level detection circuit 14 and controls the servo circuit 18 to automatically adjust the tracking (steps S1 and S2). The output signal of the switch SW is either the reproduction FM luminance signal or the reproduction FM audio signal, but this control is omitted in FIG.

The input terminal 10 for the reproduced FM luminance signal is shown in FIG.
Is connected to the output terminal of the preamplifier 32 or the output terminal of the HPF 34. The input terminal 12 for the reproduced FM audio signal is connected to the FM audio reproduction preamplifier output terminal (not shown). With this configuration, FM can be reproduced at the time of reproduction.
Auto-tracking for automatically adjusting the tracking is performed so that the level of the luminance signal or the FM audio signal is maximized. The reproduced FM luminance signal or reproduced FM audio signal selected by the switch SW is input to the level detection circuit 14 including a known envelope detection circuit, and is output as a DC level according to the amplitude. This is input to the microcomputer 16,
By an A / D converter (not shown) in the microcomputer 16,
It is a digital signal. Therefore, by controlling the servo circuit 18 by the microcomputer 16, the above tracking adjustment is performed to find a point where the amplitude of the reproduced FM luminance signal or the reproduced FM audio signal becomes maximum. Switch SW
Switching with the video head and F
Considering that due to the mounting error of the M audio head, the tracking positions at which the reproduction amplitudes are the same do not always match, and there is a tape on which the FM audio signal itself is not recorded, switching is performed with a predetermined algorithm. The tracking is adjusted. here,
The point regarded as the optimum tracking does not necessarily have to be the point where the amplitude of the reproduced FM luminance signal or the reproduced audio signal becomes the maximum, and the point where the both are well balanced may be the optimum tracking.

When the microcomputer 16 determines that the tracking adjustment has been completed (step S3), the mode (steps S4 to S7) for performing the tape performance evaluation shown in FIG. 2 is set. At this time, the switch SW is switched to the reproduction FM luminance signal side, and D output from the level detection circuit 14 is output.
The C level is converted into a digital signal by the A / D converter inside the microcomputer 16 (step S4), and this digital value is stored in a memory not shown (step S5). Next, the microcomputer 16 determines A, B, and C ranks (step S6), and creates, for example, an A rank flag having a high level when the rank is A and a C rank flag having a high level when the rank is C. (Step S6), this is output to the logic circuit 26 (step S7). The logic circuit 26 outputs the above-mentioned control signals X, Y, U and V to be given to the respective circuits of FIGS. 4, 6 and 7 according to these flags and the SP flag input from another terminal. Although the logic circuit 26 is externally attached to the microcomputer 16, the logic circuit 26 is attached to the microcomputer 16.
Of the logic circuit 2 such that the control signals X, Y, U, and V are directly output from the terminals of the microcomputer 16.
It is also possible to omit 6 as well.

When the performance evaluation of the tape T is finished, the control signals X, Y, U and V are held at the levels according to the judgment result, and the microcomputer 16 is in the level monitoring mode (steps S8 and S9) shown in FIG. )to go into. This mode is the playback F
This mode monitors whether the levels of the M luminance signal and the reproduced FM audio signal change significantly from before, and either one or both of the reproduced FM luminance signal and the reproduced FM audio signal are alternated at a predetermined cycle by a switch SW. Then, the microcomputer 16 monitors the level, and when it is determined that the level has changed beyond the predetermined range (step S9), the tape performance evaluation is performed again (steps S4 to S7), and a further large level change is detected. Then (step S8), the tracking adjustment is redone as shown in FIG. 2 (steps S1 to S7). That is, step S
In 8, S9, ΔL indicates the level change amount,
Comparison with two reference values T2 and T1 having a relationship of T2> T1 is sequentially performed. When ΔL> T2, the amount of change is considerably large, and therefore, processing related to tracking adjustment (steps S1 to S3) is performed, and then processing related to tape performance evaluation (steps S4 to S7) is performed. On the other hand, T1 <△
When L <T2, only steps S4 to S7 are performed. When ΔL ≦ T1, steps S8 and S9 are repeatedly executed. Even when playing the same tape continuously, if a new program is recorded after a program recorded in the past, the recorded machine may be different, or one of the programs may be repeatedly reproduced. Therefore, the output level may have dropped in that part,
By providing such a monitoring mode as well, the control signals X, Y, U,
It is effective to update V or redo the tracking adjustment.

In steps S8 and S9, it is detected that the level change is above a predetermined value (range), but it is detected that the level change rate is above a predetermined value. Good. Further, although providing step S8 is a preferable mode, this step can be omitted when the control of the circuit characteristics of the reproducing system is mainly considered.

Although the above embodiment has described the magnetic reproducing apparatus using the tape-shaped storage medium such as VTR, the present invention is a disk-shaped medium such as a magnetic disk (FD, HD, etc.), an optical disk (CD, etc.), or a magneto-optical disk. It can also be applied to a reproducing device such as a disc (MD).

[0028]

As described above, according to the magnetic reproducing apparatus of the first aspect, the optimum setting of the characteristics of the reproducing signal system of the magnetic reproducing apparatus such as the VTR can be realized without a large cost increase, and the tape performance and It is possible to always obtain a reproduced image with a preferable image quality according to the recording state. In addition, by changing the characteristics in several stages, each switching point requires only a simple transistor and several L, C, and R additional circuits. It also has the feature that it can be constructed at a low cost without the need for a variable gain amplifier or the like.

Further, according to the magnetic reproducing apparatus of the second aspect, since the control signal of the signal processing circuit is changed according to the change of the reproduction signal level after the tracking adjustment, in addition to the above effect, for example, the recording state ( For example, in the case of continuous playback of a tape on which multiple different signals in standard mode and long time mode are recorded, even if signals with different recording states are continuously played, each signal is played back in the optimum state. It has the feature that it can be done.

Further, according to the magnetic reproducing apparatus of the third aspect, the tracking adjustment of the tape is performed according to the change of the reproduction signal level. Therefore, in addition to the above-mentioned effects, for example, signals in different recording states are recorded. In the case of reproducing a tape (for example, recorded on another independent VTR), there is a feature that the signal can always be reproduced by performing the optimum tracking adjustment.

Further, according to the magnetic reproducing apparatus of the fourth aspect, the switch means for selectively supplying the reproduced FM luminance signal and the reproduced FM audio signal to the reproduced signal level detecting circuit is provided in front of the reproducing signal level detecting circuit. Since it is possible to control the signal processing circuit based on the reproduced FM luminance signal after performing tracking adjustment based on the reproduced FM audio signal, the reproduced image having a preferable image quality can always be provided with high accuracy. There is a feature that can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part of a preferred embodiment of a magnetic reproducing apparatus of the present invention.

FIG. 2 is a procedure diagram showing an operation of the magnetic reproducing apparatus of FIG.

FIG. 3 is a block diagram showing an example of a VTR reproduction system to which the present invention is applied.

FIG. 4 is a circuit diagram showing an example of the equalizer in FIG.

5A and 5B are graphs and waveform diagrams for explaining the operation of the equalizer in FIG.

6 is a circuit diagram showing an example of a de-emphasis circuit in FIG.

7 is a circuit diagram showing an example of a noise suppression circuit in FIG.

8 is a flowchart showing a processing procedure of a microcomputer in FIG.

[Explanation of symbols]

10 and 12 signal input terminals 14 reproduction signal level detection circuit 16 microcomputer (acts as a means for controlling the level change detection means, the updating means and the auto tracking means, as well as the auto tracking means and the control signal generation together with other circuits as described below. 18 Servo circuit (constituting automatic tracking means together with the microcomputer 16) 26 Logic circuit (constituting control signal generating means together with the microcomputer 16) 28 SP flag input terminal 30 Magnetic head (reproducing head means) 32 Preamplifier 36 AGC (Automatic Gain Control) circuit 38 Equalizer 40, 60 Limiter 42 FM demodulator 44 LPF 46 De-emphasis circuit 48 Noise suppression circuit 50 Color signal reproduction processing circuit 52 Adder 54 Output terminal 58 HPF SW switch (switch) Pitch means) T tape

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04N 5/93

Claims (4)

[Claims] 1. A reproducing head means for reading and reproducing an information signal recorded on a magnetic recording medium, a reproducing signal level detecting circuit for detecting a level of the information signal reproduced by the reproducing head means, and the reproducing signal level. A magnetic reproducing apparatus having an auto-tracking means for automatically performing tracking adjustment according to an output signal of a detection circuit and a reproduction signal system signal processing circuit for processing the information signal reproduced by the reproducing head means, Control signal generating means for obtaining a control signal for controlling the signal processing circuit of the reproduction signal system according to the level of the detected reproduction signal using the output signal of the reproduction signal level detection circuit. Magnetic reproducing device. 2. A reproducing head means for reading and reproducing an information signal recorded on a magnetic recording medium, a reproducing signal level detecting circuit for detecting a level of the information signal reproduced by the reproducing head means, and the reproducing signal level. A magnetic reproducing apparatus having an auto-tracking means for automatically performing tracking adjustment according to an output signal of a detection circuit and a reproduction signal system signal processing circuit for processing the information signal reproduced by the reproducing head means, Control signal generating means for obtaining a control signal for controlling the signal processing circuit of the reproduction signal system according to the level of the detected reproduction signal by using the output signal of the reproduction signal level detection circuit; and the auto tracking means. Tracking adjustment is performed, and the reproduction signal level is detected after the control signal generating means generates the control signal. Level change detection means for detecting that the level of the reproduction signal detected by the path has changed to a predetermined value or more or a predetermined rate or more, and the level of the reproduction signal is responsive to the output signal of the level change detection means. A magnetic reproducing apparatus comprising: an updating unit that changes the control signal when the value changes by a value or more or a predetermined rate or more. 3. The tracking adjustment is performed again when the level of the reproduction signal changes by more than the predetermined value or more than the predetermined rate in response to the output signal of the level change detecting means. 3. The magnetic reproducing apparatus according to claim 2, further comprising means for controlling the auto-tracking means. 4. A reproduced FM as the reproduced information signal.
In order to switch and use one or both of the luminance signal and the reproduced FM audio signal, switch means for selectively supplying one of the reproduced FM luminance signal and the reproduced FM audio signal to the reproduced signal level detection circuit is provided as the reproduced signal. The magnetic reproducing apparatus according to claim 1, wherein the magnetic reproducing apparatus is provided in a stage before the level detecting circuit.