JPH0110652Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an interface circuit for a sequential access type auxiliary storage device such as an audio cassette tape recorder in a computer device.

[Purpose of invention]

An object of the present invention is to provide a program for a computer device when one sequential access type auxiliary storage device is used as a peripheral device of a computer device and when two sequential access type auxiliary storage devices are used. A sequential method for computer equipment that can be realized without any changes and has the effect of eliminating the risk of internal short circuits even when two sequential access type auxiliary storage devices with different specifications are used. The present invention provides an interface circuit for an access type auxiliary storage device.

[Summary of the idea]

The present invention is a system for remotely controlling the driving and stopping of two sequential access type auxiliary storage devices based on the output of a computer device.
first and second remotes each having a switching circuit of the circuit and a signal input terminal for receiving an information signal from the auxiliary storage device, each having a switching element that is opened when the auxiliary storage device is plugged; By using a control jack, when only one of the auxiliary storage devices is connected, these switching circuits are configured to be connected in parallel to the auxiliary storage device, and the signal input It is characterized by the provision of a shielding element that cuts off the DC component of the input to the terminal.

[Example of idea]

An embodiment of the present invention will be described below with reference to the drawings.

1 is a personal computer which is a computer device; 2 is an interface circuit for connecting the personal computer 1 and an audio cassette tape recorder (hereinafter simply referred to as tape recorder) which is a sequential access type auxiliary storage device; This will be discussed below. That is, 3 is an input jack serving as a signal input terminal, and 4 is an output jack, into which a plug led out from the earphone terminal of the tape recorder and a plug led out from the microphone terminal are respectively inserted. Further, 5 is a load interface for shaping the waveform of the input signal from the input jack 3 and inputting it to the personal computer 1. In this load interface 5, 6 includes resistors 7, 8, 9, and a capacitor 10,
12 is a reference voltage generating circuit consisting of resistors 13 and 14, and 15 is a comparator circuit which receives the reference voltage from the reference voltage generating circuit 12 at its inverting input terminal (-) via a resistor 16. The non-inverting input terminal (+) of the comparison circuit 15 is biased by the reference voltage via the resistor 17 and is connected to receive the signal passed through the filter 6. Further, in the load interface 5, the input jack 3 and the filter 6 are connected via a capacitor 18 which is a disconnector. On the other hand, 19 is a save interface for supplying the output signal from the personal computer 1 to the output jack 4, which includes resistors 20, 21, 22 and capacitors 23, 24.
It is configured as a filter consisting of. 25 and 26 are remote control jacks into which plugs led out from the remote control terminal of the tape recorder are inserted. The above-mentioned remote control terminals are of a well-known configuration for controlling the drive and stop of the tape recorder, and each remote control jack 25 and 26 has a terminal 25 connected to the plug when the plug is inserted.
a, 25b and 26a, 26b are connected, respectively, and the terminals 25c and 26c are opened according to the movement of the movable tongues 25d and 26d, which are switch elements, respectively, and when the plug is unplugged, the movable tongues 25d and 26d are connected. terminal 2 according to the return movement of
5b and 25c and between 26b and 26c are respectively connected. 27 is a transistor that is turned on by the personal computer 11 when the load interface 5 is activated, and 28 is a relay having an excitation coil 28a that is energized from the plug power terminal +Vcc when the transistor 27 is turned on, and its switching circuit is Terminals a and b of the normally open relay switch 28b are connected to terminals 25a and 2 of the remote control jack 25, respectively.
5b. 29 is the personal computer 1 when the save interface 19 is activated.
The transistor 30 is turned on by the plug power terminal + when this transistor 29 is turned on.
This relay has an excitation coil 30a that is energized from Vcc, and the terminals a and b of a normally open relay switch 30b, which is a switching circuit, are connected to the terminals 26a and 26b of the remote control jack 26, respectively.
It is connected to the. The terminals 25a and 26a of the remote control jacks 25 and 26 are connected to each other, and the terminals 25c and 26a are connected to each other.
b, 25b and 26c are also connected to each other. Therefore, when a plug is inserted into only one of the remote control jacks 25 or 26, the relay switches 28b and 30b are connected in parallel to the plug. be done.

Next, the operation of this embodiment having the above configuration will be explained. Now, two tape recorders are used. Personal computer 1 reads the data stored in one tape recorder (hereinafter referred to as the loading tape recorder), and the data stored in the other tape recorder (hereinafter referred to as the loading tape recorder) is read. When storing new data in a road tape recorder (referred to as a road tape recorder), insert the plug led out from the earphone terminal of the load tape recorder into the input jack 3, and also insert the plug led out from the load tape recorder's remote control terminal. into the remote control jack 25, and then insert the plug led out from the microphone terminal of the save tape recorder into the output jack 4, and insert the plug led out from the remote control terminal of the save tape recorder into the remote control jack 26. Insert it into the In this state, the terminals 25c and 26c of the remote control jacks 25 and 26 are opened, so the remote control terminals of the load tape recorder and the save tape recorder are individually controlled by relay switches 28b and 30b, respectively. will be controlled by. Therefore, personal computer 1
When the transistor 27 is turned on and the excitation coil 28a of the relay 28 is energized,
In response to this turning on of the relay switch 28b, the loading tape recorder is driven, and the stored data is read into the personal computer 1 via the loading interface 5. Further, the transistor 29 is controlled by the personal computer 1.
When the excitation coil 30a of the relay 30 is turned on and the excitation coil 30a of the relay 30 is energized, the save tape recorder is driven in response to the relay switch 30b being turned on, and the data from the personal computer 1 is transferred via the save interface 19. The data is written to the save tape recorder. Then, when transistors 27 and 29 are turned off,
In response to this turning off, the loading tape recorder and the saving tape recorder are stopped. As described above, the driving and stopping of the two tape recorders are individually controlled remotely, and data can be written to the save tape recorder while reading data from the load tape recorder.

On the other hand, when only one tape recorder is used as an auxiliary storage device, each plug led out from the earphone terminal and microphone terminal of the tape recorder is inserted into the input jack 3 and the output jack 4, respectively, and the tape A plug led out from the remote control terminal of the recorder is inserted into one of the remote control jacks 25 and 26.
Then, for example, when the plug is inserted only into the remote control jack 25, the terminals 26b and 26c of the remote control jack 26 remain connected, and when the plug is inserted only into the remote control jack 26. Since the terminals 25b and 25c of the remote control jack 25 remain connected in this state, the relay switches 28b and 30b are connected in parallel to the plug (in other words, the tape recorder). Therefore, when the load interface 5 is activated in connection with reading data from the tape recorder and the transistor 27 is turned on, and when the save interface 19 is activated in connection with writing data to the tape recorder, the transistor 27 is turned on. In any case when 29 is turned on, the tape recorder is driven. Therefore, data reading and writing operations using only one tape recorder can be remotely controlled in the same way as in the past.

According to the interface circuit 2 having the above-described configuration, it is possible to use one tape recorder to read data and write data through the tape recorder in the same manner as before, and it is also possible to use two tape recorders. The functionality of the personal computer 1 can be increased by using each tape recorder exclusively for data reading and data writing, and in this case there is no need to change the program of the personal computer 1, making it extremely convenient for the user. . Also,
Since the configuration is such that a capacitor 18 is provided to cut off the DC component of the input to the input jack 3,
When using multiple tape recorders, even if each tape recorder has different specifications and its remote control terminals are configured with different polarities (positive and negative), the two tape recorders The direct current is cut off by the capacitor 18, so there is no possibility of an internal short circuit.

[Effect of idea]

According to the present invention, as is clear from the above explanation, there are cases in which one sequential access type auxiliary storage device is used as a peripheral device of a computer device, and two sequential access type auxiliary storage devices are used as a peripheral device of a computer device. It is possible to increase the functionality of the computer equipment by using it in different cases, and this effect can be achieved without changing the program of the computer equipment. Even when two sequential access type auxiliary storage devices are used, there is no risk of an internal short circuit occurring.

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram showing an embodiment of the present invention. In the figure, 1 is a personal computer (computer device), 2 is an interface circuit, 3 is an input jack (signal input terminal), 18 is a capacitor (shutdown element), 25 and 26 are remote control jacks, 25d, 26d is a movable tongue piece (switch element), 28 and 30 are relays, and 28b and 30b are relay switches (switching circuits).

Claims (1)

[Scope of utility model registration request] a first and a second sequential access type auxiliary storage device for individually remotely controlling driving and stopping of the two sequential access type auxiliary storage devices based on the output of the computer device;
a switching circuit, a signal input terminal for receiving an information signal from the auxiliary storage device and applying it to the computer device, and the auxiliary storage device connected to both the first and second switching circuits. first and second, each having a switch element that opens when the device is plugged;
a remote control jack, wherein a switch element of the first remote control jack is interposed between the first switching circuit and the second remote control jack, and a switch element of the first remote control jack is interposed between the first switching circuit and the second remote control jack. A switch element of the jack is interposed between the second switching circuit and the first remote control jack, and a shielding element is further provided to cut off the DC component of the input to the signal input terminal. An interface circuit for a sequential access type auxiliary storage device in a computer device, characterized by: