JPH11213482A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an A/D conversion circuit for digitizing pilot signals. SOLUTION: Reproducing signals from a recording and reproducing head 1 are supplied through a reproducing amplifier 2 to a low-pass filter 3 for extracting the band of the pilot signals and low band converted chroma signals. Then, extracted signals are supplied to the A/D conversion circuit 5 and digitized signals are supplied through the low-pass filter 6 of digital constitution for extracting the band of the pilot signals to an ATF process circuit 7. Also, the signals digitized in the A/D conversion circuit 5 are supplied through the high-pass filter 9 of the digital constitution for extracting the band of the low band converted chroma signals to a chroma process circuit 10. Further, the reproducing signals from the reproducing amplifier 2 are supplied through the high-pass filter 11 for extracting the band of luminance signals to the A/D conversion circuit 13 and the digitized signals are supplied to a luminance process circuit 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VC which performs tracking servo using a so-called four-frequency pilot signal.
The present invention relates to a recording / reproducing device applied to an R device or the like.

[0002]

2. Description of the Related Art So-called four frequencies (f1, f2, f3, f
4) In a VCR device that performs tracking servo using the pilot signal, for example, an 8 mm video device, the frequency of each pilot signal is, for example, f1
= 6.5fH, f2 = 7.5fH, f3 = 10.5fH, f4 =
9.5fH (fH is the horizontal frequency). Thus, the frequency difference from the pilot signal of the adjacent track is always fH or 3fH.

Therefore, at the time of reproduction, the frequency of the pilot signal of the track to be tracked is multiplied by the reproduction signal, so that the components of the pilot signal from the adjacent track are low-frequency converted to fH and 3fH, respectively. Then, the components of fH and 3fH are extracted from these low-frequency-converted signals using a band-pass filter, and the above-mentioned low-frequency-converted pilot signal components are detected. Further, these extracted signals are subjected to envelope detection, and a tracking servo error signal is obtained from the difference signal.

Here, the above-mentioned pilot signal component is represented by f
H and 3fH are converted to 1f at the original frequency.
This is because, when trying to directly detect each frequency of the pilot signal of 00 kHz to 166 kHz, a band-pass filter or the like having an extremely high Q value and a sharp characteristic is required.
That is, by performing low-frequency conversion on the signal as described above, a detector can be configured even with a band-pass filter having a relatively low Q value.

However, in the method of detecting a pilot signal by the above-described low-frequency conversion, signals of ± fH and ± 3fH of the pilot signal frequency are detected during the low-frequency conversion. = 6.5fH pilot signal -fH noise, frequency
Even though there is no 5.5 fH pilot signal, there is a risk that this noise component will be erroneously detected as a pilot signal.

That is, in the method of detecting a pilot signal by the above-described low-frequency conversion, for example, f1 at the original frequency is used.
-3fH, f2 -3fH, f1 -fH, f2 + fH, f
Noise components such as 4-fH, f3 + fH, f4 + 3fH, and f3 + 3fH may be erroneously detected as pilot signals even though such pilot signals do not originally exist.

Further, the above-described method using the low-frequency conversion causes a disadvantage when, for example, the above-described tracking servo error signal is automatically gain-controlled. That is, in this method, the signal detected at a time is essentially only one of | f1 |-| f3 | or | f2 |-| f4 |
These all correspond to the pilot signal of the adjacent track. Therefore, for example, automatic gain control using the signal level of the pilot signal of the track being reproduced cannot be performed.

On the other hand, in the conventional apparatus, for example, when performing automatic gain control during reproduction of the track of the pilot signal of the frequency f1, the above-mentioned tracking servo error signal | f2 |-| f4 | is detected. At a point different from the point, the signal of | f1 |-| f3 | is detected by switching the frequency of the signal used for the above multiplication. Means for obtaining the signal level for automatic gain control by regarding the level of this detection signal as the signal level of the frequency f1 has been taken.

Therefore, in this means, it is desirable that the time difference between the point where the tracking servo error signal is detected and the point where the signal level for automatic gain control is obtained is as small as possible. However, in reality, | f1 |
The time constant for detecting the signal-| f3 | or | f2 |-| f4 | is about 300 Hz to 1 kHz, and the sampling interval cannot be shortened beyond this time constant.

When a so-called standard mode and a low-speed mode are provided for a track pattern of a tape, for example, | f
1 |-| f3 | or | f2 |-| f4 | must be detected continuously. In the above-described method using the low-frequency conversion, such detection is performed, for example, by detecting an error signal of a tracking servo. It was difficult to do at the same points as you did.

By matching the detection points, it is possible to improve the lock performance of the reproduction servo, for example, when the tape path is shifted during variable speed reproduction.

[0012]

SUMMARY OF THE INVENTION Accordingly, the applicant of the present application
First, a reproduction apparatus capable of continuously detecting all pilot signals by performing signal processing by digital processing has been proposed (Japanese Patent Application No. 9-357442).

That is, in FIG.
Is reproduced through a recording / reproducing head (for example, a helical scan type rotary head) 102. The reproduced RF signal is supplied through a reproduction amplifier 103 to a low-pass filter (LPF) 104 that limits a band to a half or less of a sampling frequency in order to avoid aliasing distortion or the like in a subsequent circuit. The signal whose band has been limited by the low-pass filter 104 is A
/ D conversion circuit 105.

Further, a signal sampled and digitized by the A / D conversion circuit 105 is converted into a band-pass filter (BPF) + envelope detection circuit + corresponding to the above four frequencies (f1, f2, f3, f4). Low-pass filter (LPF) signal processing circuits 106 and 107;
The signals are supplied to 108 and 109 for detection and detection of each pilot signal.

Although the filters in the processing circuits 106 to 109 are difficult to configure with conventional analog circuits, they can be realized with a relatively simple configuration by performing digital signal processing in the present application. It is.

Further, these processing circuits 106, 107,
The four frequencies detected at 108 and 109 (f1, f2,
f3, f4), the information on the signal level of each ATF reproduced pilot signal is stored in the data latch circuits 110, 11 respectively.
1, 112, and 113. A latch timing signal from the ATF pilot data latch signal generator 114 is supplied to these latch circuits 110 to 113.

These latch circuits 110-113
Is supplied to an arithmetic circuit 115 which calculates a tracking servo phase error (ATF error) described later + calculates a tracking servo phase error signal automatic gain control (AGC) + determines a track pattern. Is done. Note that such an arithmetic circuit 115 is formed by software or the like on a so-called microcomputer (μ-com).

For example, a signal from the FG detecting element 116 for detecting the rotation speed of the capstan of the tape transfer mechanism is supplied to a capstan FG (CFG) signal detection (waveform shaping) circuit 117 to capture a rectangular wave cap. Stan FG
A signal is detected. The detected capstan FG signal is supplied to the CFG cycle detection circuit 118. The signal from the CFG cycle detection circuit 118 is supplied to an arithmetic circuit 119 for calculating a capstan speed error.

Further, a discrimination signal of the track pattern from the arithmetic circuit 115 is supplied to the arithmetic circuit 119.
As a result, the arithmetic circuit 119 calculates a capstan speed error according to the discriminated standard mode and low speed mode track patterns, and outputs a necessary speed error signal. The output of the speed error signal and the output of the phase error signal from the arithmetic circuit 115 are added and supplied to the D / A conversion circuit 120.

The signal converted into an analog signal by the D / A conversion circuit 120 is supplied to a power amplification circuit 121. Further, the power-amplified signal is supplied to the motor driver circuit 12.
2, the capstan drive motor 123 of the tape transfer mechanism is driven.

That is, in this device, the processing circuit 10
From 6, 107, 108 and 109, four frequencies (f1, f
2, f3, f4) the level of each reproduced pilot signal is
Each is taken out independently. Using the levels of these reproduced pilot signals, the arithmetic circuit 115 calculates the phase error of the tracking servo, calculates the automatic gain control of the phase error signal, determines the track pattern, and the like.

In this apparatus, the phase error of the tracking servo is calculated, for example, while the tracks of the pilot signals of the frequencies f1 and f3 are being reproduced.
4 is performed by comparing the levels of the reproduced pilot signals. During reproduction of the tracks of the pilot signals of the frequencies f2 and f4, the levels of the reproduced pilot signals of the frequencies f1 and f3 are compared.

That is, for example, while the track of the pilot signal of the frequency f1 is being reproduced, the levels of the reproduced pilot signals of the frequencies f2 and f4 are compared. For example, when the reproduction level of the frequency f2 is higher, the tape advances. Therefore, a phase error signal is output so as to delay the tape. When the reproduction level of the frequency f4 is higher, the phase error signal is output so that the tape is advanced because the tape is delayed.

Similarly, during reproduction of the track of the pilot signal of the frequency f2, the levels of the reproduced pilot signals of the frequencies f1 and f3 are compared. For example, when the reproduction level of the frequency f3 is higher, the tape advances. Output a phase error signal to delay the tape. When the reproduction level of the frequency f1 is higher, the tape is delayed, so that a phase error signal is output so as to advance the tape.

Further, during reproduction of the track of the pilot signal of the frequency f3, the levels of the reproduced pilot signals of the frequencies f2 and f4 are compared. For example, when the reproduction level of the frequency f4 is higher, the tape advances. Outputs a phase error signal to delay the tape. When the reproduction level of the frequency f2 is higher, the tape is delayed, so that a phase error signal is output so as to advance the tape.

During reproduction of the track of the pilot signal of the frequency f4, the levels of the reproduced pilot signals of the frequencies f1 and f3 are compared. For example, when the reproduction level of the frequency f1 is higher, the tape advances. Outputs a phase error signal to delay the tape. When the reproduction level of the frequency f3 is higher, the phase error signal is output so as to advance the tape because the tape is delayed. Thus, the phase error signal of the tracking servo can be obtained.

Further, the calculation of the automatic gain control of the phase error signal can be performed by detecting the reproduction level of the pilot signal of each track being reproduced. That is, in this apparatus, since the levels of the reproduced pilot signals are independently extracted, the pilot signals of the track being reproduced can be detected independently and simultaneously. Then, by detecting the level of the pilot signal, the automatic gain control of the phase error signal can be performed.

Also, when determining the track pattern of whether the recorded track is in the so-called standard mode or low-speed mode, for example, the envelope of an arbitrary pilot signal among the pilot signals of four frequencies is detected. Can be done. That is, for example, the absolute values of the reproduced pilot signals of the frequencies f1 and f3 are respectively obtained, a difference signal therebetween is formed, and the envelope of the difference signal is detected.

For example, if the envelope fluctuates for each rotation of a helical scan type rotary head during reproduction in the standard mode, for example, it is determined that the track pattern is in the standard mode. Can be. Further, for example, if the envelope is constant regardless of the rotation of the helical scan type rotary head during reproduction in the standard mode, it can be determined that the track pattern is in the low speed mode.

On the other hand, if the envelope fluctuates for each rotation of the helical scan type rotary head, for example, during reproduction in the low speed mode, it is determined that the track pattern is in the low speed mode. It can be performed. Also, for example, if the envelope fluctuates every two rotations of a helical scan type rotary head during playback in a low speed mode, the track pattern can be determined to be in the standard mode. It is.

Thus, in this apparatus, calculation of the phase error of the tracking servo, calculation of the automatic gain control of the phase error signal, and determination of the track pattern can be performed. In this case, the processing circuits 106, 1
From 07, 108 and 109, four frequencies (f1, f2, f
Since the levels of the reproduced pilot signals of (3, f4) are independently extracted, for example, the above-mentioned frequency f1-
Even if there is noise at a position such as fH, there is no possibility that this noise component is erroneously detected as a pilot signal.

Further, since the levels of the reproduced pilot signals of the four frequencies are always independently taken out, the level of the reproduced pilot signal of the track being reproduced, for example, for performing automatic gain control, can always be obtained. A signal level for good automatic gain control can always be obtained. Further, the discrimination of the track pattern can always be satisfactorily performed, and by performing these detections at the same point, for example, the lock performance of the reproduction servo can be improved.

However, in such a device, it is necessary to additionally provide an A / D conversion circuit 105 in order to digitize the pilot signal. That is, FIG.
1 shows a schematic configuration of a conventional device for performing tracking servo using a pilot signal of four frequencies, for example.

In FIG. 3, the recording / reproducing head 102
Is supplied to a low-pass filter (LPF) 104 that extracts a band of a pilot signal through a reproduction amplifier 103. And this filter 1
The signal extracted in step 04 is supplied to an ATF circuit (ATFIC) 200 which is converted into an analog IC, and a tracking error signal and the like are detected. Further, a microcomputer (μ-
com) 201.

On the other hand, with respect to a video signal, a signal has been conventionally digitized and processed. Therefore, the reproduction RF signal from the reproduction amplifier 103 is supplied to, for example, a band-pass filter (BPF) 202 for extracting a band of a low-frequency-converted chroma signal, and the signal extracted by the filter 202 is converted to an A / D conversion circuit 203. And digitized. The digitized signal is supplied to the chroma signal processing circuit 204.

Further, the reproduced RF signal from the reproducing amplifier 103 is converted into a high-pass filter (H
PF) 205, and the signal extracted by the filter 205 is supplied to an A / D conversion circuit 206 to be digitized. The digitized signal is supplied to the luminance signal process circuit 207.

In order to digitize the pilot signal in such an apparatus, the apparatus is simply configured as shown in FIG. 4, for example. That is, the signal extracted by the above-described filter 104 is converted into an A / D conversion circuit 105.
And digitized signals are supplied to the processing circuit 10 described above.
6 to 109 and so on. Then, the detected tracking error signal and the like are supplied to a microcomputer (μ-com) 201 for control.

Therefore, when the pilot signal is digitized in the above-described device (FIG. 4), an A / D conversion circuit 105 is additionally required as compared with the conventional device (FIG. 3). The addition of such an A / D conversion circuit leads to an increase in manufacturing cost and an increase in power consumption. For example, advantages such as the above-described operation stability by digital processing and elimination of variations in elements are achieved. It will cancel out.

The present application has been made in view of such a point, and the problem to be solved is that in the conventional apparatus, an additional A / D is added to digitize the pilot signal.
Since the conversion circuit is provided, this leads to an increase in manufacturing cost and an increase in power consumption, which may offset advantages such as stability of operation by digital processing and elimination of variations in elements.

[0040]

Therefore, in the present invention, when the reproduced pilot signal is digitized and tracking servo is performed, the pilot signal is digitized together with other signals. According to this, it is not necessary to additionally provide an A / D conversion circuit or the like for digitizing the pilot signal, and it is possible to perform processing such as tracking servo taking advantage of the digital processing.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS That is, the present invention relates to a recording / reproducing apparatus for detecting a four-frequency pilot signal and performing tracking servo. Is performed together with other signals.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of an example of a main part of a recording / reproducing apparatus to which the present invention is applied.

In FIG. 1, a signal recorded on a magnetic tape (not shown) is reproduced through a recording / reproducing head (for example, a helical scan type rotary head) 1, and the reproduced RF signal is reproduced by a reproducing amplifier 2 , And is supplied to a low-pass filter (LPF) 3 that extracts the band of the pilot signal and the low-frequency converted chroma signal. The signal extracted by the filter 3 is supplied to an A / D conversion circuit 5 through a mixing circuit 4 described later.

Further, the signal digitized by the A / D conversion circuit 5 is supplied to a digitally configured low-pass filter (LPF) 6 for extracting a pilot signal band, and the extracted signal is processed by the above-described processing circuits 106 to 109. A including
It is supplied to the TF process circuit 7. Then, data such as the detected tracking error signal is supplied to a control microcomputer (μ-com) 8.

The signal digitized by the A / D conversion circuit 5 is supplied to a digitally configured high-pass filter (HPF) 9 for extracting a band of a low-frequency-converted chroma signal. Then, the extracted signal is supplied to a chroma processing circuit 10 that performs digital processing of a known chroma signal.

Further, a high-pass filter (HPF) for extracting the band of the luminance signal from the reproduction RF signal from the reproduction amplifier 2
11 is supplied. The signal extracted by the filter 11 is supplied to an A / D conversion circuit 13 through a changeover switch 12 described later. The signal digitized by the A / D conversion circuit 13 is transmitted to a changeover switch 1 described later.
4, the luminance signal is supplied to a luminance processing circuit 15 that performs digital processing of a known luminance signal.

Also, so-called line input terminals 16 and 17
Is provided. The input terminal 16 is supplied with a chroma signal and the input terminal 17 is supplied with a luminance signal. This input terminal 1
The signal from 6 is supplied to a band-pass filter (BPF) 18 for extracting the band of the chroma signal, and the extracted signal is supplied to the above-described mixing circuit 4 through a switch 19 described later. Further, a signal from the input terminal 17 is supplied to a low-pass filter (LPF) 20 that extracts a band of the luminance signal, and the extracted signal is supplied to the above-described switch 12.

Further, an image pickup device (CCD) 21 is provided. A signal from the image pickup device 21 is, for example, a well-known CCD process circuit 22 for taking out a signal from a CCD or the like.
Supplied to The signal taken out by the process circuit 22 is supplied to the A / D through the switch 12 described above.
It is supplied to the conversion circuit 13. Further, the signal digitized by the A / D conversion circuit 13 is supplied to a camera process circuit 23 for performing a known digital processing of an image pickup signal through the above-described changeover switch 14.

In the subsequent stage of the above-mentioned chroma process circuit 10, luminance process circuit 15, and camera process circuit 23, a well-known video signal recording circuit, a monitor device, an external output means, etc., which are not shown, are provided. .

In this apparatus, during reproduction, a pilot signal in the reproduction signal from the recording / reproduction head 1 and a signal in the band of the low-frequency-converted chroma signal are extracted by the low-pass filter 3, and the extracted signal is A The data is supplied to the / D conversion circuit 5 and digitized. A signal in the band of the luminance signal in the reproduced signal is extracted by the high-pass filter 11, and the extracted signal is selected by the changeover switch 12 and digitized by the A / D conversion circuit 13.

That is, in this device, two A / Ds
The conversion circuits 5 and 13 digitize the pilot signal and the low-frequency-converted chroma signal, and digitize the luminance signal. The pilot signal and the low-frequency-converted chroma signal are separated from the signal digitized by the A / D conversion circuit 5, and the tracking servo and the chroma signal are digitally processed. Further, digital processing of a luminance signal is performed using the signal digitized by the A / D conversion circuit 13.

Further, at the time of recording a line input, the magnetic tape (not shown) is first rewound a little, and the signal recorded on the track slightly before is reproduced. Then, a signal in the band of the pilot signal of the reproduced signal is extracted by the low-pass filter 3. The chroma signal from the line input terminal 16 is extracted by the band-pass filter 18, mixed with the signal of the pilot signal band from the low-pass filter 3 by the mixing circuit 4, and digitized by the A / D conversion means 5.

The luminance signal from the line input terminal 17 is extracted by the low-pass filter 20, and the extracted signal is selected by the changeover switch 12 and the A / D converter 1
Digitized at 3. Then, the pilot signal and the chroma signal are separated from the signal digitized by the A / D conversion circuit 5, and the tracking servo and the chroma signal are digitally processed, respectively. Further, digital processing of the luminance signal is performed using the signal digitized by the A / D conversion means 13.

That is, in this device, two A / Ds
The conversion circuits 5 and 13 digitize the reproduced pilot signal and the input chroma signal, and digitize the input luminance signal. Then, the above-mentioned reproduced pilot signal and chroma signal are separated from the signal digitized by the A / D conversion circuit 5, and the tracking servo and the chroma signal are digitally processed, respectively. Further, digital processing of the luminance signal is performed using the signal digitized by the A / D conversion circuit 13.

At the time of this recording, the magnetic tape (not shown) is first rewound a little, and the signal recorded on the track slightly before is reproduced to perform tracking servo. As a result, recording can be performed from the state where the tracking servo is applied in advance, and continuous recording can be performed without causing tracking servo disturbance during reproduction. After the start of recording, the circuits of the tracking servo processing system such as the reproduction amplifier 2 to the ATF process circuit 7 are put into a power reduction state.

At the time of imaging, the magnetic tape (not shown) is first rewound a little, and the signal recorded on the track slightly before is reproduced. Then, a signal in the band of the pilot signal of the reproduced signal is extracted by the low-pass filter 3 and digitized by the A / D converter 5. Further, digital processing of tracking servo is performed using the signal digitized by the A / D conversion circuit 5.

On the other hand, the image pickup signal taken out from the image pickup device 21 through the CCD process circuit 22 is a signal in which a luminance signal and a chroma signal are mixed in an arbitrary format. Therefore, the image signal is directly selected by the changeover switch 12 and digitized by the A / D conversion means 13, and predetermined digital processing is performed by the camera process circuit 23.

That is, in this device, two A / Ds
Digitization of the pilot signal reproduced using the conversion circuits 5 and 13 and digitization of the imaging signal are performed. Then, digital processing of tracking servo is performed using the reproduced pilot signal digitized by the A / D conversion circuit 5. Further, digital processing of the imaging signal is performed using the signal digitized by the A / D conversion circuit 13.

At the time of this imaging, the magnetic tape (not shown) is first rewound a little, and the signal recorded on the track from a little before is reproduced to perform tracking servo. As a result, recording can be performed from the state where the tracking servo is applied in advance, and continuous recording can be performed without causing tracking servo disturbance during reproduction. Also, after the imaging (recording) starts,
Circuits of the tracking servo processing system such as the reproduction amplifier 2 to the ATF process circuit 7 are put into a power reduction state.

Therefore, in this apparatus, when the reproduced pilot signal is digitized and tracking servo is performed, by digitizing the pilot signal together with other signals, A / D conversion for digitizing the pilot signal is performed. There is no need to additionally provide a circuit or the like, and processing such as tracking servo can be performed by utilizing the merits of digital processing.

As a result, in the conventional device, an additional A / D conversion circuit is provided for digitizing the pilot signal, which leads to an increase in manufacturing cost and power consumption, and a stable operation by digital processing. However, according to the present invention, these problems can be easily eliminated, although there is a possibility that the advantages such as the elimination of the characteristics and the dispersion of the elements are offset.

Further, in the apparatus of the present invention, for example, by forming the A / D conversion circuit 5, the ATF process circuit 7, and the chroma process circuit 10 on the same IC,
For example, the output signal line of the A / D conversion circuit 5 (generally 6 to 1)
(Consisting of zero) on the mounting board is no longer necessary, and the mounting efficiency of the board can be improved and the size of the device can be reduced.

According to the recording / reproducing apparatus described above, 4
In a recording / reproducing apparatus that performs tracking servo by detecting a pilot signal of a frequency, when performing the tracking servo by digitizing the reproduced pilot signal, by digitizing the pilot signal together with other signals, There is no need to additionally provide an A / D conversion circuit or the like for digitization, and it is possible to perform processing such as tracking servo utilizing the merits of digital processing.

[0064]

Therefore, according to the first aspect of the present invention, when the reproduced pilot signal is digitized and tracking servo is performed, the pilot signal is digitized together with other signals, thereby digitizing the pilot signal. It is not necessary to additionally provide an A / D conversion circuit or the like for this purpose, and it is possible to perform processing such as tracking servo taking advantage of the digital processing.

As a result, in the conventional apparatus, an additional A / D conversion circuit is provided for digitizing the pilot signal, which leads to an increase in manufacturing cost and an increase in power consumption, thereby stabilizing the operation by digital processing. However, according to the present invention, these problems can be easily eliminated, although there is a possibility that the advantages such as the elimination of the characteristics and the dispersion of the elements are offset.

Further, for example, by forming an A / D conversion circuit, an ATF process circuit and a chroma process circuit on the same IC, for example, an output signal line of the A / D conversion circuit (generally composed of 6 to 10 lines) ) Does not need to be routed on the mounting board, improving the mounting efficiency of the board,
It is possible to reduce the size of the device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an example of a recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a configuration diagram of an example of a main part of a recording / reproducing apparatus previously proposed by the present applicant.

FIG. 3 is a configuration diagram of a conventional recording / reproducing apparatus.

FIG. 4 is an explanatory diagram in a case where the processing of a pilot signal is simply digitized.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording / reproducing head, 2 ... Reproduction amplifier, 3,20 ... Low-pass filter, 4 ... Mixing circuit, 5,13 ... A / D conversion circuit, 6 ... Digital low-pass filter, 7 ... ATF
Process circuit, 8: microcomputer for control, 9
... Digital high-pass filter, 10 Chroma process circuit, 11 High-pass filter, 12, 14 Changeover switch, 15 Luminance process circuit, 16, 17
Line input terminal, 18: band pass filter, 19: switch, 21: imaging device, 22: CCD process circuit,
23… Camera process circuit

Claims (6)

[Claims] In a recording / reproducing apparatus for detecting a four-frequency pilot signal and performing tracking servo, when the reproduced pilot signal is digitized and the tracking servo is performed, digitization of the pilot signal is performed by another method. A recording / reproducing apparatus characterized in that it is performed together with a signal. 2. The recording / reproducing apparatus according to claim 1, wherein said pilot signal is digitized together with a video signal to be recorded / reproduced. 3. The recording / reproducing apparatus according to claim 1, wherein the pilot signal is digitized together with a low-frequency-converted chroma signal to be recorded / reproduced. 4. The recording / reproducing apparatus according to claim 1, further comprising first and second A / D converters, wherein, during reproduction, a band of the pilot signal and a low-band converted chroma signal in a reproduction signal is provided. Is digitized by the first A / D conversion means, and the signal of the luminance signal band in the reproduced signal is converted to the second A / D signal.
A recording / reproducing apparatus, wherein the tracking servo is performed by separating the pilot signal from the signal digitized by the first A / D converter. 5. The recording / reproducing apparatus according to claim 1, further comprising first and second A / D converters, wherein a recording medium is provided during reproduction tracking servo immediately before recording of a luminance signal and a chroma signal is started. The signal in the band of the pilot signal is reproduced, and the reproduced signal and the chroma signal in the input signal are digitized by the first A / D conversion means. The luminance signal in the input signal is converted into the luminance signal in the input signal. 2. A recording / reproducing apparatus, wherein the tracking servo is performed using the pilot signal digitized by the first A / D conversion means. 6. The recording / reproducing apparatus according to claim 1, further comprising first and second A / D converters, wherein when the imaging signal from the imaging unit is recorded, the bandwidth of the pilot signal on the recording medium is reduced. Reproducing the signal and digitizing the reproduced signal by the first A / D conversion means; digitizing the imaging signal by the second A / D conversion means; A recording / reproducing apparatus for performing the tracking servo using the pilot signal digitized in step (a).