JPS5922313B2 - Multi-channel magnetic recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-channel magnetic recording device that can easily switch from a recording state to a recording state.

After making a predetermined recording on a magnetic tape using a tape recorder, there are cases where it is desired to modify a part of the recording. In such cases, even if a playback head is provided, do not use it, use the recording head for playback to accurately find the part you want to correct, and immediately switch to recording mode when you find the part you want to correct. Now make a correction recording using the recording head you were currently using for playback. This allows you to accurately correct only the part you want to correct. Devices with this type of function have already been developed, but when making correction recordings with conventional devices, it requires an operation to switch the recording head used for playback to a recording circuit, and an operation to set the recording state. had to be performed at the same time, making the operations cumbersome.

In addition, in a multi-channel recording/playback device, in order to facilitate operation, if the recording head of any one channel is connected to the recording circuit, that channel will be in the recording state and the remaining channels will be in the recording state. Taking advantage of the standby state, we sacrificed one channel and set the remaining channels to recording standby state, obtained playback output from the recording head for the remaining channels, searched for the correction position, and found the correction position. In that case, the recording head was connected to the recording circuit and a corrected recording was made.

As a result, at least one channel was sacrificed. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a multi-channel magnetic recording device that can easily perform correction recording.

The present invention for achieving the above object will be described with reference to the reference numerals in the drawings showing the embodiments for easy understanding.
A plurality of recording heads 3 are provided corresponding to a plurality of channels, and the plurality of recording heads 3 are connected to respective recording circuits 2.
a plurality of recording/playback changeover switch circuits 4 for selectively connecting to the respective playback circuits 14, and a plurality of channel selection/recording/playback switching controls for controlling the plurality of recording/playback changeover switch circuits 4, respectively; circuits 26a and 26b; a recording switch 23 for recording or recording standby when turned on; and a recording switch 23 for recording or recording standby for all of the plurality of channels in response to turning on the recording switch 23; The recording or recording standby setting circuit 24 enters an operating state in which the recording or recording standby setting circuit 24 can be set to the operating state, and the channel selection and recording playback switching is performed by turning on the recording or recording standby setting circuit 24 in the energized state. The control circuits 26a and 26b are energized, but when the recording or recording standby setting circuit 24 is turned on in the non-energized state, the channel selection/recording/playback switching control circuit 26a,
26b cannot be energized and the recording or recording standby setting circuit 24 is energized in a state where it has been turned on in advance. The plurality of channel selection/recording/playback switching control circuits 26a, 26b are energized.
and a plurality of channel selection and recording playback control switches 29a and 29b respectively associated with the recording or recording standby setting circuit 24, and the channel selection and recording playback control switches 29a and 29b respectively associated with the recording or recording standby setting circuit 24; The display blinks in response to turning on the recording/playback switching control switches 29a, 29b, indicating that the recording or recording standby setting circuit 24 is in the energized state and the channel selection/recording/playback switching control switches 29a, 29b are turned on. The present invention relates to a multi-channel magnetic recording device that includes a plurality of channel status display devices 31a and 31b that turn on continuously in response to an operating state.

According to the above invention, switching from the playback state to the recording state by the recording head 3 is performed by operating the recording switch 23 or by the channel selection/recording/playback switching control switches 29a, 29b.
This can be done by operating the .

Therefore, it becomes possible to switch to corrected recording easily and quickly. Furthermore, when the channel selection/recording/playback switching control switches 29a, 29b are turned on while the recording or recording standby setting circuit 24 is in the de-energized state, the channel status display devices 31a, 31b flash, so it is difficult to determine which channel is to be modified. It is possible to easily determine whether an item has been selected for recording. When the recording or recording standby setting circuit 24 is energized in this blinking state, the channel status display devices 31a and 31b become continuously lit. Therefore, it is possible to easily determine which channel has been corrected and recorded. Therefore, corrected recording can be performed accurately and quickly. Additionally, channel status can be displayed with a simple configuration. Next, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory diagram of a part of the electrical circuit of a multi-channel tape recorder.

In this circuit, a recording circuit 2 comprising a recording equalizer amplifier and the like is connected to an input terminal 1 for supplying a recording signal. The recording head 3 is not directly connected to the recording circuit 2, but is connected via a recording/playback switch circuit 4. Reference numeral 5 denotes an oscillator which supplies an AC bias current to the recording head 3 and an AC erase current to the erase head 6.

Although only one channel circuit configuration is shown in FIG. 1, in this device one oscillator 5 supplies alternating current for eight channels of recording and erasing. That is, the output of the oscillator 5 is connected to the recording head circuit via an amplifier T, a switch 8, and a bias adjustment capacitor 9, and is also connected to the erasing head 6 via a capacitor 10 and a switch 11. The reproducing head 12 is connected via a switch 13 to a reproducing circuit 14 comprising a reproducing equalizer amplifier and the like.

The playback circuit 14 includes not only the playback head 12 but also the recording head 3 as well as a switch circuit 4 and a corrective playback switch 1.
5. Therefore, output signals from the playback head 12 and the recording head 3 are selectively sent to the output terminal 16. The above-mentioned switch circuit 4 and switches 8 and 11 have an interlocking configuration, and the switch circuit 4 is connected to its contact point b.
switches 8 and 11 when the circuit is in the on state.
The switches 8 and 11 are related to each other so that they are turned on when the switch circuit 4 turns on the circuit of its contact a. Switch 15 is turned on when it is desired to reproduce data using the recording head. The switch 13 is turned on when the playback head performs normal playback. The magnetic heads 3, 6, and 12 are arranged so as to be in sliding contact with a magnetic tape 18 running in the direction of arrow 17. The lower half of FIG. 1 is an explanatory diagram of the circuit of the control unit, which includes a power supply 19, a normally closed stop switch 20, and a play switch 2 for setting the play mode.
A play control circuit 22 is connected via 1.

Furthermore, a recording or recording standby setting circuit 24 is connected via a recording switch 23. The switches 21 and 23 are normally open switches, but are each equipped with a self-holding circuit (not shown). The self-holding circuit of the switch 23 is the switch 21
and 23 are turned on at the same time. The play control circuit 22, which is energized when the switch 21 is turned on, uses this energization to operate the tape running device 25 to put the tape in a running state. That is,
It is used to release the brake, drive the reel motor, connect the pinch roller to the capstan, etc. The recording or recording standby setting circuit 24 turns on the recording or recording standby setting switches 27a and 27b by this energization. Reference numerals 26a and 26b are channel selection/recording/playback switching control circuits provided for each channel in order to control the switch circuit 4 of each channel.

Although only the control circuits 26a and 26b for two channels are shown in FIG. 1, there are actually eight channels, and when the common recording or recording standby setting circuit 24 is energized, the control circuits 26a and 26b for each channel are activated. The switches 27a and 27b are turned on at the same time, and the common recording display device 28 is energized and becomes a blinking display. Channel selection/recording/playback switching control switch 29a connected in series to switches 27a and 27b
, 29b are turned on to energize the channel selection/recording/playback switching control circuits 26a, 26b with the power supplies 30a, 30b during normal recording or when it is desired to perform recording on the recording head from a state where the recording head is playing back. . Since the switches 29a and 29b are provided for each channel,
Only the channel of the switch that is turned on will be in recording mode. Channel selection/recording/playback switching control circuit 26a, 2
Reference numeral 6b is used to switch the recording/reproduction changeover switch circuit 4 to the recording side by this energization, and turn on the switches 8 and 11. Reference numerals 31a and 31b are channel status display devices, which flash when switches 27a and 27b are kept off and switches 29a and 29b are turned on; When turned on, the display lights up continuously.

Therefore, it is possible to clearly determine which channels are on standby for recording and which channels are currently being recorded. The above-mentioned recording display device 28 becomes a flashing display when both the switches 29a and 29b are off and the recording or recording standby setting circuit 24 is energized.
When the switch is turned on and the recording or recording standby setting circuit 24 is energized, the display lights up continuously. next,
The handling method and operation of this device will be described below.

First, when performing normal recording with this device, the recording switch 23 is turned on at the same time as the play switch 21.

This forms a self-holding circuit for each switch 21, 23, and maintains the on state. As a result, the play control circuit 22 is energized, the tape running device 25 is activated, and the magnetic tape 18 is placed in a running state. Further, the recording or recording standby setting circuit 24 is energized, and the respective recording or recording standby setting switches 27a and 27b are turned on. Now, which channel selection/recording/playback switching control switch 29a,
If 29b is also off, the recording display device 28 is turned on and off by the recording or recording standby setting circuit 24, notifying the user that it is in the recording standby state. Therefore, the user knows that recording can be started at any time. When the recording standby state is reached, the channel selection/recording/playback switching control switches 29a and 29b are turned on to start recording. now,
If you want to record on all channels, turn on the switches 29a and 29b for all channels. As a result, the display devices 31a and 31b of all channels turn on continuously, indicating that recording has started. switch 29a
, 29b are turned on, the channel selection/recording/playback switching control circuits 26a, 26b are energized, the contact a side of the recording/playback switching circuit 4 is turned on, and the switch 8 is turned on.
, 11 are turned on. As a result, the recording signal applied to the input terminal 1 is amplified by the recording circuit 2 and then sent to the recording head 3 via the switch circuit 4, so that a prescribed recording is made on a prescribed channel of the magnetic tape 18. At this time, an erase current is passed from the oscillator 5 to the erase head 6, and an alternating current bias is applied to the recording head 3. During this recording, the switch 15 is turned off, the switch 13 is turned on, and the reproduction head 12 monitors and reproduces the recording. Recording using this device can also be performed by methods other than those described above. In this other method, the channel selection/recording/playback switching control switches 29a and 29b to be recorded are turned on in advance. As a result, the display device 3 of the selected channel
1a and 31b become blinking displays. As a result, it becomes clear which channel is to be recorded from now on, and it is also known that that channel is in a recording standby state. Next, the play switch 21 and the recording switch 23 are turned on at the same time. This causes the tape to run as described above, and the switches 27a and 27b are turned on. Since the switches 29a and 29b of the selected channel have already been turned on, the channel selection/recording/playback switching control circuits 26a and 26b of the selected channel are immediately energized, and the selected channel enters the recording state. At this time, the recording display device 28 becomes a continuous lighting display, and the channel status display devices 31a and 31b of the selected channel are changed from a blinking display to a continuous lighting display state. In the latter recording method described above, the switches 29a and 29b function as recording standby switches. To cancel the above-mentioned recording state, either the stop switch 20 is turned off, or the channel selection/recording/playback switching control switches 29a and 29b are turned off.

To obtain a reproduction signal from a recorded magnetic tape under normal conditions, the play switch 21 is turned on with the switch 15 turned off and the switch 13 turned on. As a result, the tape 18 runs, and the signal reproduced by the reproduction head 12 is obtained from the output terminal 16. Next, we will discuss the case of corrected recording.

Each channel 32a of the magnetic tape 18 as shown in FIG.
, 32b, 32c, and as a result of playing back this, if you want to correct and record only part 33, you can store the playback information of that channel immediately before the corrected part 33 or the playback information of another channel. put. If playback information immediately before the modified portion 33 of a channel having the modified portion 33 is stored, the switch 15 for that channel is turned on and the switch 13 is turned off. As a result, a reproduction system is formed by the recording head, which includes the recording head 3, the switch circuit 4, the switch 15, the reproduction circuit 14, and the reproduction output terminal 16. At this time, the switches 29a and 29b are turned off, so the recording head 3 is connected to the reproduction circuit via the switch circuit 4. In the above-mentioned state, first, in order to find the corrected portion 33, the play switch 21 and the recording switch 23 are turned on at the same time. When the play switch 21 is turned on, tape running starts,
A playback output is obtained from the recording head 3. Recording switch 2
3 does not have to be turned on at the same time as the start of playback as described above, but it must be turned on some time before the correction portion 33. When the recording switch 23 is turned on,
As described above, the recording or recording standby setting circuit 24 is energized and the switches 27a and 27b are turned on. Also, the recording display device 28 flashes to notify that it is in a recording standby state. When the recording head 3 continues to play back and reaches t1 just before the modified portion 33, the channel selection/recording/playback switching control switch 29a corresponding to the channel to be modified, for example, the channel 32a, is turned on.

At the same time, the signal to be corrected and recorded is also input to the input terminal 1. When switch 29a is turned on, switch 27
Since the control circuit 26a is already turned on, the control circuit 26a is immediately energized, and the recording head is connected to the recording circuit side by the switch circuit 4. At the same time, switches 8 and 11 are turned on, a recording bias is applied, and an erase current is supplied to the erase head. During the period in which the above-mentioned correction recording is being performed, the display device 31a of the channel on which the correction recording is being performed is lit continuously. When stopping corrective recording, the switch 29a is turned off or the stop switch 20 is turned off. Corrected recording can also be done in the following way.

First, switch 29a72 for the channel you want to record the correction to.
9b is turned on in advance, and in this state, the play switch 21 is turned on. As a result, the tape runs, and a reproduction output is obtained by a reproduction system consisting of the recording head 3, switch circuit 4, switch 15, reproduction circuit 14, and output terminal 16. When a portion to be corrected and recorded is found based on the playback output, the recording switch 23 and the play switch 21 are turned on at the same time. As a result, the recording switch 23 is kept on, and the switches 27a and 27b are turned on, and the control circuits 26a and 27b of only the selected channel are turned on.
26b is energized, the selected recording head 3 is connected to the recording circuit side by the switch circuit 4, and enters a modified recording state. As described above, with this device, the playback status of the recording head 3 can be changed by simply operating the channel selection/recording/playback switching control switches 29a and 29b of the channel to be corrected or by operating the recording switch 23 at the start of correction recording. Since it is released and enters the correction recording state, it can be operated with one hand, making it easy to operate.

Further, according to this device, it is possible to enter the recording standby state only with the recording switch 23, so there is no need to sacrifice one channel in a multi-channel device.

In addition, the recording or recording standby setting circuit 24 is kept de-energized,
Channel selection/recording/playback switching control switch 29a, 2
If 9b is selectively turned on, the channel status display devices 31a and 31b corresponding to the selected channel will be in a blinking display state, making it possible to clearly know which channel is in the recording standby state.

Furthermore, when the recording or recording standby setting circuit 24 is energized in this state, the selected one of the channel status display devices 31a and 31b becomes lit continuously, making it possible to clearly determine which channel is in the recording status. . or,
When the recording or recording standby setting circuit 24 is energized and all channel selection/recording/playback switching control switches 29a and 29b are kept off, the recording display device 28 enters a blinking display state and is in recording standby mode. Something turns out to be true.

Therefore, it is understood that corrective recording can be started immediately by turning on the switches 29a and 29b. If either of the switches 29a and 29b is turned on, the recording display device 28 is turned on continuously, indicating that recording is in progress. Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be further modified.

For example, in the drawings of the embodiment, the switch circuit 4 and the switches 8, 11, 13, 15, 20, 21, 23, 27a, 2
Although 7b, 29a, and 29b are shown in the form of mechanical switches, they may also be configured as electronic switches.

[Brief explanation of the drawing]

FIG. 1 is an explanatory block diagram of a multi-channel recording/reproducing apparatus to which the present invention is applied, and FIG. 2 is a plan view explanatory of the state of a magnetic tape.

Claims (1)

[Claims] 1. A plurality of recording heads 3 provided corresponding to a plurality of channels, and a plurality of recording/playback devices for selectively connecting the plurality of recording heads 3 to respective recording circuits 2 and respective reproduction circuits 14. a changeover switch circuit 4; and a plurality of channel selection/recording/playback switching control circuits 26a, 26 for controlling the plurality of recording/playback switch circuits 4, respectively.
b, a recording switch 23 for recording or entering a recording standby state by turning on the recording switch 2;
a recording or recording standby setting circuit 24 that is in an operating state in which all of the plurality of channels can be set to a recording or recording standby state in response to the ON operation of step 3; By turning on the channel selection/recording/playback switching control circuits 26a and 26b in the energized state, the channel selection/recording/playback switching control circuits 26a and 26b are turned on. In operation, the channel selection/recording/playback switching control circuit 26
a, 26b cannot be energized, and when the recording or recording standby setting circuit 24 is energized in a state where it has been turned on in advance, the channel selection/recording/playback switching control circuit 26a, 26b The plurality of channel selection/recording/playback switching control circuits 26a, 26b are energized.
and a plurality of channel selection and recording/playback switching control switches 29a and 29b respectively associated with the recording or recording standby setting circuit 24, and the recording or recording standby setting circuit 2.
4 in the non-energized state, the display blinks in response to turning on the channel selection/recording/playback switching control switches 29a, 29b, and the recording or recording standby setting circuit 24 is in the energized state and the A multi-channel magnetic recording device comprising a plurality of channel status display devices 31a and 31b that display continuous lighting in response to channel selection/recording/playback switching control switches 29a and 29b being turned on.