JPH03707B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has an operating mode in which a teacher's voice recorded on one track of a tape can be heard while recording one's own voice on the other track, for example, during language practice. The present invention relates to a magnetic recording/reproducing device.

Conventionally, this type of magnetic recording/playback device has two modes: a normal operating state (hereinafter referred to as normal state) in which recording or playback is performed simultaneously on both tracks of a tape, and a language practice state (hereinafter referred to as normal state) in which recording is performed on one track while playing back on the other track. It is now possible to adopt two operating states (hereinafter referred to as the LL state). However, if you remove the tape that was used in the LL state and try to use it in the normal state by attaching another tape, if you forget to switch from the LL state to the normal state, the cassette's accidental erasure prevention piece will be folded and recorded in the LL state. Since recording can be performed on one track of the tape even if the recording is prohibited, there is a drawback that a malfunction may occur in which an important tape may be erased by mistake.

In order to overcome these drawbacks, some devices have linked the switch to the LL state with a piece to prevent accidental erasure or a cassette eject button, but this makes the structure complicated and increases costs. It was something like that.

The present invention is characterized in that it is realized using a simple electric circuit in order to prevent the above-mentioned malfunctions. An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram showing the main parts of this embodiment. 1 is a recording switch circuit equipped with a recording button 1a and its detection circuit 1b; when the recording button 1a is closed, its output becomes H level;
It is input to one of a and 6b. AND circuit 6a,
The other input of 6b is controlled by a control circuit described below, and in order to permit recording only when an H level signal is input to both inputs, a first track recording switching device 7a and a second track recording switching device 7b are operated. A driving signal is output.

2 is a cassette accidental erasure prevention piece detection switch 2a
This is an accidental erasure prevention piece detection circuit equipped with a detection circuit 2b and a detection circuit 2b, which outputs an H level signal when the accidental erasure prevention piece of the cassette is folded (recording prohibited state). If not (recording enabled state), an L level signal is output.

Reference numeral 3 denotes an LL changeover switch circuit including a changeover switch 3a to the LL state and its detection circuit 3b, and numeral 4 denotes a normal changeover switch circuit equipped with a changeover switch 4a to the normal state and its detection circuit 4b.
These changeover switch circuits 3 and 4 output H level signals only while their respective switches are closed.

Reference numeral 5 designates an eject detection circuit which includes a micro switch 5a and a detection circuit 5b for detecting whether the cassette is loaded or removed, and outputs an H level signal when the cassette is removed. do.

When the changeover switch 3a of the LL changeover switch circuit 3 is closed, the output of the LL changeover switch circuit 3 becomes H level, setting the flip-flop 8, and its output Q becomes H level. This results in
Through the OR circuit 9, recording is enabled on the second track of the tape, and through the NOR circuit 10, recording is prohibited on the first track of the tape. Therefore, when the recording button 1a is closed, only the second track is in the recording state.

When the changeover switch 4a of the normal changeover switch circuit 4 is closed, the output of the normal changeover switch circuit 4 becomes H level, resets the flip-flop 8 through the OR circuit 11, and its output Q becomes L level. As a result, the output of the NOR circuit 10 is set to the H level only when the erase prevention piece of the cassette is not broken through the NOR circuit 10, that is, when the output of the accidental erase prevention piece detection circuit 2 is at the L level, and the output of the NOR circuit 10 is set to the H level. Recording permission status is given to both tracks 1 and 2.

When the cassette is removed, the output of the eject detection circuit 5 becomes H level, this signal is input to the OR circuit 11, and the subsequent operation is the same as when the changeover switch 4a of the normal changeover switch circuit 4 is closed. be.

Next, the above logic circuit can be constructed by a microcomputer. An example of its configuration and an example of a program are shown in FIGS. 2 and 3, respectively.

Record button detection circuit 1b, accidental erasure prevention piece detection circuit 2
b, the LL switch detection circuit 3b, the normal switch detection circuit 4b, and the eject detection circuit 5b are connected to the input side of the microcomputer 12.
The recording switching devices 7a and 7b for the first track and the second track of the tape are respectively connected to the output side of a microcomputer 12, and are controlled by the microcomputer 12.

Next, the operation will be explained along the flowchart of FIG.

First, when the changeover switch 4a of the normal changeover switch circuit 4 is closed when the cassette is not ejected, information indicating the normal state (for example, "0") is set in the internal register or memory of the microcomputer 12.

On the other hand, when the changeover switch 3a of the LL changeover switch circuit 3 is closed, the microcomputer 1
2 is set to information indicating that it is in the LL state (for example, "1"). Then, the processing of this routine ends.

When the cassette is ejected, it follows the same path as when the changeover switch 4a was closed, and information indicating that it is in the normal state is set.

Also, if the recording button 1a is closed, the current LL
If it is in the recording state, a signal is output to the second track recording switching device 7b of the tape, and only the second track is placed in the recording state.

If the current state is normal, it is further determined whether or not there is an accidental erasure prevention piece on the cassette, and if it is not folded, a signal is output to the recording switching devices 7a and 7b of both the first and second tracks, and both tracks are switched. Both are in recording mode. Note that if the erroneous erasure prevention piece is folded, no processing is performed and the processing of this routine ends.

With this configuration, the same operations as in the previous example can be performed using a microcomputer. Further, if the microcomputer 12 is used in common with a microcomputer for controlling the mechanism, etc., it can be realized without increasing the number of parts.

As is clear from the above embodiments, according to the present invention, even if the tape is used in the LL state, when the cassette is removed, the tape automatically returns to the normal state. By keeping it in place, you will avoid accidentally deleting it.

Furthermore, the configuration that automatically returns to the normal state when the cassette is removed is equipped with an eject detection circuit.
Since it can be constructed with only an OR circuit, there is no need to provide a mechanically complex interlocking device between the LL selector switch, eject button, and accidental erasure prevention piece as in the past, which is extremely advantageous in terms of cost. .

[Brief explanation of drawings]

Fig. 1 is a block circuit diagram showing the main parts of a magnetic recording/reproducing device according to an embodiment of the present invention, Fig. 2 is a block circuit diagram of an embodiment using a microcomputer, and Fig. 3 is a block circuit diagram of an embodiment using the same microcomputer. This is an example of a program flowchart. 6a, 6b...AND circuit, 8...Flip-flop, 9...OR circuit, 10...NOR circuit, 1
1...OR circuit.

Claims (1)

[Claims] 1. A first state in which recording or playback can be simultaneously performed on the first and second tracks of the tape in the cassette, and a first state in which it is possible to record on the other track while playing back one track. a switching means for switching the second state; a detecting means for detecting the cassette ejecting operation or the cassette ejecting state; a detecting means for detecting whether the accidental erasure prevention piece of the cassette is folded; a memory circuit for storing information as to whether the device is in the first or second state, and when the switching means is operated to the first state or when the cassette ejecting operation is performed, the memory circuit storing information that the circuit is in the first state, and when the switching means is operated to the second state, storing information that the circuit is in the second state; If the information that the circuit is in the first state is stored and the accidental erasure prevention piece is not folded, the recording instruction signal causes the first state to be set.
If both the track and the second track are in the recording state and the memory circuit stores information indicating that the track is in the second state, regardless of whether the accidental erasure prevention piece is folded or not. First, a magnetic recording/reproducing device characterized in that only one track is put into a recording state by a recording instruction signal.