JPH0210501B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects an unrecorded area for a certain period of time or more formed on a magnetic recording medium such as a magnetic tape with an audio signal recording/playback head, and counts the detected output. An automatic song selection function that makes it possible to locate the beginning of a predetermined recording section recorded on the magnetic recording medium, and the unrecorded section recorded by a head provided independently of the recording/playback head in the unrecorded section. A control signal representing an absolute address of the magnetic recording medium is reproduced by the head, and an automatic music selection function is provided, which makes it possible to locate the beginning of a predetermined recording section recorded on the magnetic recording medium corresponding to the reproduced output. The present invention relates to a magnetic recording and reproducing device.

Conventionally, in magnetic recording and reproducing devices such as tape recorders, a method for automatically detecting a predetermined recorded portion recorded on a magnetic recording medium such as a magnetic tape is to detect a non-recorded portion formed on the magnetic recording medium for a certain period of time or more. A method of detecting a recording part by detecting a recording part, or a method of recording a control signal such as an address signal that specifies a recording part on the same track as a predetermined recording part recorded on a magnetic recording medium on the same track as that recording part. There are known methods of detecting these signals and detecting a desired recording area.

By the way, the above-mentioned detection methods are all methods of detecting unrecorded parts using an audio signal recording/playback head or detecting a control signal, so it is difficult to use a device equipped with an unrecorded part detection method. Magnetic recording media whose recording parts are automatically detected are:
Devices equipped with a control signal detection method do not automatically detect the recording section, while devices using a control signal detection method that can automatically detect the recording section detect the area where the control signal is recorded. The same magnetic recording medium can be used interchangeably between both methods, as it acts as a recording section similar to the recording section for audio signals, so devices using the unrecorded section detection method cannot automatically detect it. Not available.

Therefore, the present invention makes it possible to perform automatic song selection using either the unrecorded portion detection method or the control signal detection method, and also makes it possible to perform automatic song selection using either the unrecorded portion detection method or the control signal detection method. The control signal representing the absolute address of the unrecorded area is recorded in such a way that it can hardly be reproduced by an audio signal recording/reproducing head, and this magnetic recording medium is equipped with only an unrecorded area detection method. When it is attached to a device that has been installed to perform an automatic song selection operation, the portion where the control signal is recorded can function as a non-recorded portion, making it possible to function as a non-recorded portion detection method for devices that are equipped with only a non-recorded portion detection method, which was previously impossible. It is designed to be used interchangeably.

Furthermore, the present invention combines the erasing head with a head for recording and reproducing a control signal representing the absolute address of a non-recorded area formed on a magnetic recording medium, and the head for recording and reproducing the control signal is used for recording and reproducing an audio signal. - This prevents the installation space from increasing due to being provided independently from the reproducing head, and also increases the erasing efficiency of the erasing head.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block circuit diagram showing an embodiment of a recording and reproducing system for audio signals and control signals in a magnetic recording and reproducing apparatus according to the present invention. In this figure, 1 is a tape supply reel, 2 is a tape take-up reel, and these reels 1 and 2 are
is rotationally driven by a reel motor 4 whose rotation speed and rotation direction are controlled according to the control output of a motor control circuit 3. A magnetic tape 5, which is a magnetic recording medium, is mounted on a rack between the reels 1 and 2, and is configured to run between the reels 1 and 2.

An audio signal recording/reproducing head 6 is provided in the tape running path along which the magnetic tape 5 runs so as to be in sliding contact with the magnetic tape 5, and on the tape supply reel 1 side which is upstream of the recording/reproducing head 6. Similarly, a composite head 7 having control signal recording and reproducing functions is provided so as to be in sliding contact with the magnetic tape 5.

As the composite head 7 used here, for example, one constructed as shown in FIG. 2 is used. This composite head 7 has first and second cores 9, 10 abutted against each other on both sides of a center core 8, and a plurality of mutually parallel first and second magnetic gaps _G1 ,
An erasing coil ₁ is attached to a center core 8 forming a substantially E-shaped core block 11 forming a magnetic gap _G2 , and forming a magnetic path corresponding to the first magnetic gap G1.
2 and the second magnetic gap.
It is constructed by winding a control signal recording/reproducing coil 13 around a second core 10 forming a magnetic path corresponding to _G2 . Note that the first and second magnetic gaps G ₁ and G ₂ formed in the composite head 7 are as follows:
At least the gap W ₂ of the second magnetic gap G ₂ is made smaller than the gap W 1 of the first magnetic gap G ₁ , for example _, the gap W ₁ of the first magnetic gap G ₁
When is 100 μ, the gap W ₂ of the second magnetic gap G ₂
is formed to a thickness of about 50μ.

The composite head 7 has the magnetic gap _G3 of the audio signal recording/reproducing head 6, which is arranged so that the magnetic gap _G3 is perpendicular to the width direction of the magnetic tape 5, as shown in FIG. On the other hand, first and second magnetic gap G ₁ and G ₂ which are parallel to each other are arranged so as to be shifted by a predetermined azimuth angle Θ.

By the way, a recording equalizer circuit 15 is connected to the audio signal recording/reproducing head 6 via the switching operator 14a of the first switching switch 14 and the recording side contact 14R. A recording/reproducing equalizer amplifier 17 is connected via the switching operator 14a and the reproducing side contact 14P, and the reproducing side contact 16P of the second changeover switch 16 and the switching operator 16a. On the input side of this recording/playback equalizer amplifier 17, there is a microphone 19 selected by an input signal selection switch 18 or a line input terminal 2.
0 is the recording side contact 16 of the second changeover switch 16
It is connected to R via a switching operator 16a. Furthermore, the recording/reproducing equalizer amplifier 17 has a third
The recording equalizer circuit 15 is connected via the switching operator 21a of the switching switch 21 and the recording side contact 21R.
It is connected to the. Further, a level meter 22 is connected to the output side of the recording/playback equalizer amplifier 17, as well as a volume adjuster 23 and a sound quality adjuster 24.
A speaker 26 is connected via a reproduction output amplifier 25.

A high frequency oscillator 28 is connected to the erase coil 12 side of the composite head 7 for supplying an erase current to the composite head 7 via the contact 27R of the fourth changeover switch 27 and the changeover operator 27a. When an erasing current is supplied from the high frequency oscillation circuit 28 during erasing operation mode for erasing the recorded signal recorded on the magnetic tape 5, the first
A magnetic field is generated by the erase current in the second magnetic gaps G ₁ and G ₂ , and the composite head 7 functions as a so-called double gap erase head.

Further, this high frequency oscillator 28 is connected via the recording side contact 14R of the first changeover switch 14 and the changeover operator 14a so that a bias current can be supplied to the audio signal recording/reproducing head 6 during recording of the audio signal. It is connected to the recording/playback head 6.

In addition, the control signal recording of the composite head 7
On the playback coil 13 side, a control signal oscillator 30 that outputs a control signal representing the absolute address of the non-recording area formed in advance on the magnetic tape 5 is connected to a switching operator of the first control signal recording switch 31. 31a, the first contact 31b, the gate circuit 32, the delay circuit 33, and the second
The control signal recording switch 34 is connected to the first contact 34b of the control signal recording switch 34 via a switching operator 34a.

It should be noted that the control signal representing the absolute address of the unrecorded section outputted from the control signal oscillator 30 is outputted by the one designated in accordance with the desired selection button of the address designation operating device 35.
Further, a data comparator 36 is connected to the output side of the control signal oscillator 30, and the specified control signal is input to this comparator 36.

Further, on the side of the control signal recording/reproducing coil 13 of the composite head 7, this composite head 7
The data comparator 36 amplifies the playback output of a control signal representing the absolute address of the non-recorded part recorded on the non-recorded part of the magnetic tape 5 being played back.
An amplifier 37 is connected via the switching operator 34a of the second control signal recording switch 34 and the second contact 34c so that the absolute address signal is detected and recorded on the magnetic tape. A selection switch between an automatic music selection (hereinafter referred to as RMS) operation for locating the beginning of a predetermined recording section and an automatic music selection (hereinafter referred to as AMS) operation for locating the beginning of a predetermined recording section recorded on a magnetic tape by counting unrecorded sections. The data comparator 36 is connected through 38 first contacts 38b, a switching operator 38a, and a second contact 38c.

This data comparator 36 is connected to a first connection terminal 39 of the motor control circuit 3.

On the other hand, the reproduction output of the audio signal recording/reproducing head 6 is controlled by the switching operator 14a of the first switching switch 14 and the reproduction side contact 14, as described above.
P, regeneration side contact 16 of the second changeover switch 16
It is input to the audio reproduction system via the switching operator 16a and the recording/reproduction equalizer amplifier 17, and is also input to the output side of the equalizer amplifier 17.
The third contact 38d of the RMS/AMS selection switch 38, the switching operator 38a, and the fourth contact 3
The signal is input to an UP/DOWN counter 40 which counts the unrecorded portions formed on the magnetic tape 5 connected via the magnetic tape 8e. Further, an address designation operating device 35 is connected to this counter 40, and this operating device 35
The designated number specified by the user is inputted.

Further, the counter output of the counter 40 is connected to the output side of the counter 40, and is also inputted to the gate circuit 32 and the motor control circuit 3 through a third control signal recording switch 41. It is connected to the motor control circuit 3. Incidentally, when recording a control signal, the counter output is transmitted via the switching operator 41a and the first contact 41b of the third control signal recording switch 41 and the second connection terminal 42 of the motor control circuit 3. is input to the motor control circuit 3, and in operation modes such as RMS or AMS automatic song selection operations other than when recording the control signal, the switching operator 41a of the third control signal recording switch 41 and the second contact point 41c and the first connection terminal 39 of the motor control circuit 3.

Next, the operation and operation of recording a control signal representing the absolute address of the unrecorded part on the unrecorded part of the magnetic tape 5 using the apparatus of the present invention constructed as described above will be explained.

First, a magnetic tape 5 is prepared, on which a non-recorded area for a certain period of time or longer is formed in advance so that a control signal can be recorded at the starting end of each recording area where a desired audio signal is recorded, and this magnetic tape 5 is inserted into the apparatus of the present invention. Installing.

Here, the first, second, and third control signal recording switches 31, 34, and 41 are in the ON state, that is, the switching operators 31a and 34 of each switch are turned on.
a, 41a to the first contacts 31b, 34, respectively.
b, connect to 41b. At this time, a first
Second, third and fourth changeover switches 14,1
6, 21, 27 switching operators 14a, 16
a, 21a, and 27a are the playback side contacts 14, respectively.
It is connected to P, 16P, 21P, and 27P and placed in a playback operation mode. Therefore, the audio signal recording/reproducing head 6 and the composite head 7 are brought into sliding contact with the magnetic tape 5.

Furthermore, RMS/AMS selection switch 38
Switch to AMS operation mode. In this state, if you operate the address designator 35 and specify a number corresponding to a non-recorded part located in a predetermined order among the non-recorded parts formed on the magnetic tape 5, the number corresponding to this designated number will be displayed. The designated number is UP/
The signal is input to the DOWN counter 40 and the control signal oscillator 30, and the oscillator 30 outputs a control signal representing the absolute address of the non-recording area corresponding to the specified number to the gate circuit 32 via the first control signal changeover switch 31. be placed in a state of

Here, when the operation mode of the magnetic recording/reproducing apparatus is set to fast-forward operation mode and the magnetic tape 5 is fed at high speed from the tape supply reel 1 side to the tape take-up reel 2 side, the magnetic tape 5 is 5 is reproduced, and the reproduced output is inputted to the UP/DOWN counter 40 via the first changeover switch 14, the second changeover switch 16, the recording/reproduction equalizer amplifier 17, and the RMS/AMS selection changeover switch 38. Ru.
Then, this counter 40 counts the number of unrecorded parts where the output level during playback output is approximately 0 or below a certain level for a certain period of time or more, and when this counted number matches the specified number mentioned above, the counter 40
A coincidence output signal is output from the gate circuit 32, and this output signal is input to the gate circuit 32 to operate the gate circuit 32. Then, the address signal designator 3
A control signal output from the control signal oscillator 30 representing the absolute address of the non-recording section corresponding to the specified number specified in step 5 is sent to the delay circuit 33. At the same time, the output signal from the counter 40 is transferred to the switching operator 41a of the third control signal recording switch 41.
and the first contact 41b and the second contact of the motor control circuit 3.
The signal is input to the motor control circuit 3 through the connection terminal 42 of the motor. When this motor control circuit 3 receives an input to the second connection terminal 42, it rotates the reel motor 4 for a predetermined period of time in the opposite direction to the previous rotation direction. In other words, the magnetic tape 5 running from the tape supply reel 1 side to the tape take-up reel 2 side is moved in the opposite direction between the above-mentioned non-recording section and the composite head for at least the time period in which the starting end of the designated non-recording section returns to the composite head 7. Let it run until it touches 7. Thereafter, the reel motor 4 is controlled so that the magnetic tape 5 runs at a constant running speed from the tape supply reel 1 to the tape take-up reel. Then, the control signal whose output has been delayed by the delay circuit 33 by the time the magnetic tape 5 travels in the reverse direction is sent to the control signal recording/reproducing coil 13 of the composite head 7 via the second changeover switch 34. A control signal representing the absolute address of the unrecorded part of the magnetic tape 5 is recorded by the second magnetic gap _G2 of the composite head 7 into the unrecorded part of the magnetic tape 5.

Furthermore, when the address specifying device 35 is operated to designate a number corresponding to a predetermined unrecorded area formed on the magnetic tape 5, the designated unrecorded area is A control signal representing the absolute address of is recorded in the non-recording section. By repeating similar operations, control signals representing the absolute addresses of the respective unrecorded areas can be recorded in each unrecorded area formed on the magnetic tape 5. If the absolute address of the non-recorded part is recorded in the non-recorded part formed on the magnetic tape 5 in this way, then by specifying the number corresponding to the above-mentioned absolute address using the address specifying operation device 35, the desired absolute address can be set. It is possible to cue the recording section of the audio signal recorded in accordance with the .

By the way, the composite head 7 has a function of recording a control signal representing the absolute address of the non-recording area.
The magnetic gaps G ₁ and G ₁ which are parallel to each other are arranged to be shifted by a predetermined azimuth angle Θ with respect to the magnetic gap G ₃ of the audio signal recording/reproducing head 6 as described above. By arranging the composite head 7 with the azimuth angle θ shifted in this way, the control signal recorded by the composite head 7 on the non-recorded area of the magnetic tape 5 is transferred to the audio signal recording/reproducing head 6. In the end, the azimuth loss becomes large, so it is rarely regenerated. Conversely, the audio signal recorded on the magnetic tape 5 by the audio signal recording/reproducing head 6 suffers a large azimuth loss and is hardly reproduced by the composite head 7.

For example, if the recording wavelength λ, which is the ratio of the frequency of the control signal output from the control signal oscillator 30 to the tape speed V, is 100μ, and the track width W is 1.5m/m, the composite head 7
The azimuth angle Θ of the second magnetic gap G ₂ is the magnetic gap of the audio signal recording/reproducing head 6.
By shifting 5 degrees from G ₃ , the above record/
The reproduction output of the control signal by the reproduction head 6 is -60 dB or more, and this control signal hardly appears as reproduction output depending on the recording/reproduction head. Therefore, the unrecorded area in which the control signal is recorded by the composite head 7 functions as an unrecorded area for the audio signal recording/reproducing head 6 as before.

Next, an explanation will be given of an automatic music selection operation for specifying the above absolute address and locating the beginning of a predetermined audio signal recording section.

When performing automatic song selection through this operation, the magnetic tape 5 on which the control signal representing the absolute address of the unrecorded area is recorded is loaded into the device of the present invention, and the recording/playback circuit of the device is placed in the playback operation mode. . That is, each of the switching operators 14a, 16a, 21a of the first, second, and third switching switches 14, 16, and 21 for selecting the operation mode of recording or reproducing audio signals is connected to the playback side contact 1.
4P, 16P, and 21P, and the switching operator 27a of the fourth switching switch 27 is connected to the reproduction side contact 27P to open it. Further, the switching operator 31a of the first control signal recording switch 31 is connected to the second contact 31c to open it, and the switching operator 3 of the second and third control signal recording switches 34, 41 is opened.
4a, 41a are connected to second contacts 34c, 41c, and the first, second and third control signal recording switches 31, 34, 41 are set to the control signal reproducing state. At the same time RMS/
The switching operator 38a of the AMS selection switch 38 is switched to connect between the first and second contacts 38b and 38c, and the switch 38
is set to RMS automatic song selection operation mode. At this time, the audio signal recording/reproducing head 6 and the composite head 7 are placed in sliding contact with the magnetic tape 5.

Here, the address designator 35 is used to designate a designation number corresponding to the absolute address of the non-recorded area corresponding to the recording part of the desired audio signal, and the device is set to fast forward operation mode and the magnetic tape 5 is transferred to the tape supply reel 1. The tape is then fed to the take-up reel 2 at high speed. Then, the control signal oscillator 30 outputs a control signal corresponding to the specified number, and this control signal is input to the data comparator 36. On the other hand, composite head 7
is in a state where the magnetic tape 5 is played back by the second magnetic gap _G2 , and the second magnetic gap G2
A playback output is output from the control signal recording/playback coil 13 wound around the magnetic path corresponding to _G2 . By the way, the second magnetic gap _G2 , which constitutes the magnetic path around which the control signal recording/reproducing coil is wound, is installed with an azimuth angle Θ shifted from the recording track, which is the recording section of the audio signal. From the composite head 7 having the magnetic gap _G2 , only the reproduced output of the control signal recorded by the composite head 7 is outputted to the non-recording portion where the azimuth angle Θ is not shifted. The reproduction output of the control signal reproduced by this composite head 7 is transmitted through the switching operator 34a of the second control signal switching switch 34 and the second contact 3.
4c and is input to the amplifier 37 and amplified,
The first contact 38b of the RMS/AMS selection switch 38, the switching operator 38a and the third contact 38
It is input to the comparator 36 via c. The comparator 36 compares the control signal input in advance with the control signal reproduced by the composite head 7, and when the control signals match, the comparator 36 outputs a match signal. . This coincidence signal is input to the first connection terminal 39 of the motor control circuit 3.
When there is an input to this first connection terminal 39, the motor control circuit 3 controls the rotational speed of the reel motor 4 from a high rotational speed to a constant rotational speed, and changes the magnetic tape 5 from a high speed running state to a constant speed running state. do. When the magnetic tape 5 is kept running at a constant speed in this way,
The tape is running between the composite head 7 and the audio signal recording/reproducing head 6 when the recording section in which the audio signal is recorded following the non-recording in which the control signal corresponding to the number designated by the address designation controller 35 is recorded. It will be in a state where it will be rolled out. In other words, the so-called cueing of the magnetic recording section is performed, which is a state in which the recording section can be reproduced by the recording/reproducing head 6. The cue of the recording section performed here is performed by specifying a control signal representing the absolute address of the unrecorded section and by detecting the unrecorded section where the specified control signal is recorded. Therefore, the beginning of a certain recording section following the unrecorded section in which the control signal corresponding to the designated number is recorded is always performed.

As described above, when the selected recording section is cued and the magnetic tape 5 reaches a constant speed running state, the audio signal recorded in the recording section is normally processed by the audio signal recording/reproducing head 6. It is played according to the playback operation mode. The playback output of the audio signal played back by the recording/playback head 6 is transmitted between the switching operator 14a of the first changeover switch 14 and the playback side contact 14.
P and playback side contact 1 of the second changeover switch 16
It is input to the recording/playback equalizer amplifier 17 via 6P and the switching operator 16a, and then the volume 23, the sound quality adjuster 24, and the playback output amplifier 25.
The signal is input to the speaker 26 via the speaker 26, and the sound is reproduced by the speaker 26.

Incidentally, in the above-described embodiment, the audio signal recording/reproducing head 6 and the composite head 7 are arranged at a certain distance apart. Therefore, if the reel motor 4 is rapidly controlled from a high rotation speed to a constant rotation speed as described above when a non-recorded portion in which a control signal corresponding to the number specified by the compound head 7 is recorded is detected, During the time when the starting end of the selected recording section following the above-mentioned non-recording section reaches from the composite head 7 to the audio signal recording/playback head 6, the non-recording state continues or recording continues before the above-mentioned non-recording section. The recorded portion of the unspecified audio signal is reproduced by the audio signal recording/reproducing head 6 and output to the speaker 2.
6 may be output.

In order to prevent such problems from occurring, after the composite head 7 detects an unrecorded area in which a control signal corresponding to a specified number is recorded, the magnetic tape 5 starts recording and reproducing audio signals from the composite head 7. The reel motor 4 may be run at a high speed for the time it takes to reach the head 6, and then the rotational speed of the reel motor 4 may be controlled to maintain a constant speed.

Further, according to the device of the present invention, the third and fourth contacts 38 of the RMS/AMS selection switch 38
The switching operator 38 connects between d and 38e.
By switching the switch 38 to the AMS automatic song selection operation mode, the number of unrecorded parts formed on the magnetic tape 5 for a certain period of time or longer can be counted when the magnetic tape 5 is fed at high speed. This makes it possible to perform an automatic music selection operation for locating the beginning of a predetermined recording section in which the audio signal recorded on the magnetic tape 5 is recorded.

The operation of performing this automatic music selection operation will be described below.

When automatic music selection is performed by this operation, the magnetic tape 5 on which a non-recorded portion for a certain period of time or more is formed between recording sections on which audio signals are recorded or on the starting end side of the recording sections is loaded into the apparatus of the present invention. When the magnetic tape 5 is loaded, the recording/reproducing circuit of the apparatus is placed in the reproducing operation mode, similar to the automatic music selection operation by detecting the control signal representing the absolute address described above. At this time, the first control signal recording switch 31 is opened, and the second control signal recording switch 34 is switched to its switching operation 34a.
is connected to the second contact 34c side, but the RMS/
The first and second AMS selection switch 38
Since the contacts 38b and 38c are in an OFF state, the reproduced output from the second magnetic gap _G2 of the composite head 7 is not input to the data comparator 36. Further, the switching operator 41a of the third control signal recording switch 41 is connected to the second contact 41c, and the UP/DOWN counter 4
0 output to the first connection terminal 3 of the motor control circuit 3
9.

Here, the apparatus is set to a fast-forward operation mode, and the magnetic tape 5 is fed at high speed from the tape supply reel 1 to the tape take-up reel 2. Specify the desired order number. Then, the UP/DOWN counter 40 receives a signal corresponding to the number designated by the address designation controller 35, and the reproduction output from the audio signal recording/reproduction head 6 is input to the first and second The signal is input via the switching switches 14 and 16, the recording/reproducing equalizer amplifier 17, and the RMS/AMS selection switch 38. The UP/DOWN counter 40 counts the unrecorded portions on the magnetic tape 5 included in the playback output of the recording/playback head 6. When the number of unrecorded portions counted here matches the reserved count number, which is the specified number, the counter 40 outputs a match output signal. The output signal from this counter 40 is sent to the third control signal recording switch 41.
The signal is input to the first connection terminal 39 of the motor control circuit 39 via the switching operator 41a and the second contact 41c. When there is an input to this first connection terminal 39, the motor control circuit 3 controls the rotational speed of the reel motor 4 from a high rotational speed to a constant rotational speed in the same way as described above, and the magnetic tape 5 which is in a high speed running state is controlled. variably controlled to a constant speed running state. magnetic tape 5
When the vehicle is brought into a constant speed running state in this manner, the recording section following the non-recording counted by the counter 40 becomes in a state where it is played back in the normal playback mode by the audio signal recording/playback head 6. The recording section at the sequential position designated by the address designation operating device 35 is located.

Incidentally, in an automatic song selection operation in which the unrecorded portions are counted and the recorded portion is cued, the aforementioned unrecorded portions are detected by the recording/reproducing head 6 of the audio signal. Therefore, the unrecorded portion formed on the magnetic tape 5 may be one that does not output a reproduction output or only outputs a reproduction output below a certain level depending on the audio signal recording/reproduction head 6.

By the way, as mentioned above, the composite head 7 is arranged at a predetermined azimuth angle Θ with respect to the magnetic gap _G3 of the audio signal recording/reproducing head 6.
The unrecorded area on the magnetic tape 5 on which the control signal was recorded by the second magnetic gap _G2 is not played back by the recording/playback head 6 due to the large azimuth loss, so this control signal is not recorded. The non-recording section functions as a non-recording section for the recording/playback head 6.
Therefore, in the magnetic tape 5, it is possible to cue the recording section even by automatic song selection operation by counting the unrecorded sections. Furthermore, this magnetic tape 5
As is clear from the above-mentioned points, even in a magnetic recording/reproducing apparatus which only has an AMS function by counting unrecorded parts, it is possible to cue the recording part. Therefore, the magnetic tape 5 on which the control signal is recorded in the unrecorded part by the device of the present invention is AMS
Devices with only RMS functions and devices with only RMS functions can be used interchangeably. On the other hand, since the device of the present invention is equipped with the AMS function and the RMS function at the same time, it can be used with any magnetic tape whose recording section can be cued by a device equipped with the AMS function and the RMS function, respectively. You can also perform automatic song selection.

By the way, the composite head 7 used in the device of the present invention has a plurality of mutually parallel magnetic gaps, and a control signal recording/reproducing coil is wound around a magnetic path corresponding to one of the magnetic gaps, and the control signal recording/reproducing coil is wound in a magnetic path corresponding to one of the magnetic gaps. As long as the head is a composite type that has both the function of recording or reproducing control signals using one magnetic gap and the function of erasing, various types as shown below can be used.

The composite head 107 shown in FIG. 4 has first and second cores 9 and 10 abutted against each other on both sides of a center core 8, and a plurality of parallel first and second cores, similar to the one shown in FIG. 2 magnetic gap G ₁ ,
It has an approximately E-shaped core block 11 formed with _G2 .

These magnetic gaps G ₁ and G ₂ are such that at least the gap W ₂ of the second magnetic gap G ₂ is smaller than the gap W 1 of the first magnetic gap G 1 , and the gap W 2 of the second magnetic gap G ₂ is smaller than the gap W ₁ of the first magnetic gap G 1 .
If the gap W ₁ of the magnetic gap G ₁ is 100μ, then the second
The gap W ₂ of the magnetic gap G ₂ is formed to be about 50μ. The erasing coil 12 and the control signal recording/reproducing coil 13 are wound in parts around the center core 8 of the core block 11 to form a winding composite head 107.

Further, the composite head 207 shown in FIG.
The control signal recording/reproducing coil 13 is wound around the second core 10. The first and second magnetic gaps G ₁ and G ₂ in this composite head 207 have _a gap W 1 of the first magnetic gap G ₁ of 100 μm and a gap W ₂ of the second magnetic gap G ₂ of 100 μ or less. It is formed as follows. A first core 9 around which the erasing coil 13 is wound
A spacer 51 is interposed in the first magnetic gap _G1 formed on the side to form the first and second auxiliary gap G1.
g ₁ and g ₂ are configured.

Further, the composite head 307 shown in FIG.
U-shaped main core 5 forming a magnetic gap _G1 of
An auxiliary core 53 formed in a substantially L shape is butted against one side of 2 to form a second magnetic gap _G2 ,
A core block 11 having a plurality of magnetic gaps G ₁ and G ₂ is formed, and an erasing coil 12 is wound around a main core 52 constituting a magnetic path including a first magnetic gap G ₁ , and a second magnetic gap G _{2 is} formed. The control signal recording/reproducing coil 13 is wound around an auxiliary core 53 constituting a magnetic path including the control signal recording/reproducing coil 13. In this composite head 307 as well, first and second auxiliary gaps g 1 and g ₂ are connected through a spacer 51 in the first magnetic gap G 1 formed in the main core 52 around which the erasing coil _{12 is} wound. It consists of

When the composite heads 107, 207, 307 of FIGS. 4, 5, and 6 configured as described above are also used in the apparatus of the present invention, the composite head 7 shown in FIG. Similarly, the erasing coil 12 side is the contact 2 of the fourth changeover switch 27.
7R and a switching operator 27a, the control signal oscillator 30 is connected to the high frequency oscillator 28 on the side of the control signal recording/reproducing coil 13, and is connected to the switching operator 31a of the first control signal recording switch 31 and the first contact 31b. , the gate circuit 32, the delay circuit 33, and the first contact 34b of the second control signal recording switch 34 via the switching operator 34a, and further inputs the reproduced output of the control signal to the comparator 36. The amplifier 37 is connected via the changeover operator 34a and the second contact 34c of the second control signal recording switch 34, and the first contact 38b, the changeover operator 38a and the second contact of the RMS/AMS selection changeover switch 38 are connected. is connected to the comparator 36 via a contact 38c. Each of the composite heads 107, 207, and 307 functions as a composite head or as a control signal recording/reproducing head in accordance with the switching operation between the erasing operation mode or the control recording/reproducing operation mode, as described above. do.

By the way, the composite head 107, 207, 3
07 as a composite head, in the composite head 107 shown in FIG. 4, the first and second magnetic gaps G ₁ ,
A magnetic field is generated in G ₂ by the erasing current supplied from the high frequency oscillator 28, and both the first and second magnetic gaps G ₁ and G ₂ have an erasing function, and the composite head 207 shown in FIGS. 5 and 6 , 307, magnetic fields are generated by the erase current in the first and second auxiliary gaps g ₁ and g ₂ formed in the first magnetic gap G ₁ , respectively. Therefore, each of the above composite heads 1
07, 207, and 307 all serve as double-gap erasing heads, and can significantly enhance the erasing effect. And these composite heads 10
7, 207, 307 and the composite head 7 shown in FIG. 2 are useful when applied to tape recorders that use so-called metal tapes having high residual magnetic flux density and coercive force as magnetic recording media.

In addition, according to the composite head 307 shown in FIG. 6, the magnetic path including the second magnetic gap _G2 , which has the function of recording and reproducing control signals, can be made small, so that signals with high frequencies of 20 KHz or higher can be made small. It can also be applied when used as a control signal.

Furthermore, the composite head used in the device of the present invention is
Any device may be used as long as the erasing function and the control signal recording/reproducing function can be selected according to the switching operation of the erasing operation mode or the control signal recording/reproducing operation mode, and as shown in FIG. 7, the composite head shown in FIG. Similar to 7, approximately E-shaped core block 1
1, and the first core 9 of this core block 11
The erasing coil 12 may be wound around the second core 10, and the control signal recording/reproducing coil 13 may be wound around the second core 10.

According to the present invention as described above, AMS, which is an automatic music selection method, counts unrecorded portions formed on the magnetic tape for a certain period of time or more and locates the beginning of the recorded portion recorded on the magnetic tape. It is also selectively recorded using RMS, which is an automatic music selection system that locates the beginning of the recording section recorded on the magnetic tape by detecting a control signal representing the absolute address of the non-recording section recorded in the above-mentioned non-recording section. You can cue the section.

Furthermore, since the control signal recorded in the unrecorded area on the magnetic tape by the apparatus of the present invention can hardly be reproduced by the audio signal recording/reproducing head due to azimuth loss,
The non-recording section in which the control signal is recorded functions as a non-recording section for the recording/playback head. Furthermore, the magnetic tape on which control signals are recorded by the apparatus of the present invention can be used to cue the recording section even in conventionally commonly used magnetic recording and reproducing apparatuses equipped only with the AMS function.

Therefore, according to the present invention, it is possible to use a desired recording magnetic tape with compatibility with and in conjunction with a magnetic recording/reproducing apparatus having only an AMS function.

Furthermore, since the present invention uses an integrated head for recording and reproducing control signals and a composite head, there is no need for an increase in installation space.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a recording and reproducing system for audio signals and control signals in a magnetic recording and reproducing apparatus according to the present invention. FIG. 2 is a schematic plan view showing an example of a composite head used in the apparatus of the present invention, and FIG. 3 is a schematic front view showing the arrangement of the composite head and the audio signal recording/reproducing head. FIG. 4 is a schematic plan view showing another example of the composite head used in the device of the present invention, FIG. 5 is a schematic plan view showing still another example of the composite head, and FIG. 6 is a schematic plan view showing still another example of the composite head. FIG. 7 is a schematic plan view showing still another example of the composite head; FIG. 7 is a schematic plan view showing still another example of the composite head. DESCRIPTION OF SYMBOLS 1... Tape supply reel, 2... Tape take-up reel, 3... Motor control circuit, 5... Magnetic tape, 6... Audio signal recording/playback head, 7
...Composite head, 12... Erasing coil, 13...
...Control signal recording. Regeneration coil, 30...
Control signal oscillator, 35...Number specification controller, 36...Comparator, 38...RMS/AMS selection switch, 40...UP/DOWN counter, _G1 , _G2 ...Magnetic gear of composite head , _G3
...magnetic gap of the audio signal recording/playback head.

Claims (1)

[Scope of Claims] 1. Finding the beginning of a predetermined recorded portion recorded on the magnetic recording medium by counting unrecorded portions formed on the magnetic recording medium for a certain period of time or more during high-speed feeding of the magnetic recording medium. A magnetic recording and reproducing device having an automatic song selection function that enables the recording and reproducing of audio signals, comprising: an audio signal recording/reproducing head having a magnetic gap disposed perpendicularly to the longitudinal direction of the magnetic recording medium;
A composite head is provided, which integrally constitutes a recording/reproducing head for control signals and an erasing head, which has a plurality of mutually parallel magnetic gaps arranged at a predetermined azimuth angle with respect to the magnetic gap of the reproducing head, A magnetic recording and reproducing device which uses a composite head to record, reproduce, and erase a control signal corresponding to an absolute address of the unrecorded area on the unrecorded area on the magnetic recording medium.