JPS6035080Y2 - LL system equipment - Google Patents

Description

[Detailed explanation of the invention] This invention consists of a plurality of language practice terminal devices, etc.
Language Laboratory) −, i
The present invention relates to an improvement of a stem device, particularly a control device thereof.

In order to be able to call out to students (all controls) for each program (teaching material audio) with the conventional LL system device, the same number of control lines as program lines were required.

Furthermore, in order to select the program on the student's side, a switch must be used to synchronously switch between the program line and the control line.

The present invention was devised to improve the problems of the prior art, and involves superimposing and transmitting a DC control signal that utilizes the charging and discharging of a capacitor to each program line to control program changes, etc. It is something.

First, with reference to FIG. 1, an example of a conventional LL system device including a monitor device having multiple functions will be described.

In FIG. 1, 1 (1-1 to 1-n) are each provided on the side of a terminal device operated by an individual student.
2 (2-1 to 2-n) are control circuits provided corresponding to the amplifiers 1-1 to 1-n; 3 is a monitor to which monitoring headphones are connected; a tape recorder audio amplifier to which a microphone is connected; amplifier, 4 is a designated switch circuit, 5 is a designated student scan switch circuit, 6 is an undesignated student scan switch circuit, 7 is a group designation switch circuit, 8 is a program designation switch circuit, 9 is a shift register, 10 is a high-speed oscillator, 11 12 is an oscillator, 12 is a selection circuit, 13 is a scanning switch circuit, and 14 is a manually operated switch circuit.

Of these, the amplifier 1 and the control circuit 2 belong to the terminal equipment on the student side (referred to as a student in the following explanation), and the others belong to the equipment on the teacher side.

In such a configuration, pulses from the oscillator 11 are supplied to the shift register 9 through the selection circuit 12 in response to a forward or reverse operation instruction from the switch circuit.

The outputs 81 to Sn from the shift register 9 are sequentially applied to the control circuits 2-1 to 2-n, and the outputs of the corresponding amplifiers 1-1 to 1-n for each student are sequentially supplied to the monitor amplifier 3.

In this way, the teacher can check all students' amplifiers 1-1 to 1.
-n output can be monitored sequentially.

Next, in order to sequentially monitor the students designated in advance, the output of the designated student scanning switch circuit 5 is used to switch the control circuits 2 other than the control circuits corresponding to the students designated by the designated switch circuit 4 to the corresponding amplifiers. 1 and sequentially supplies only the output of amplifier 1 corresponding to the designated student to monitor amplifier 3.

In addition, when sequentially monitoring students other than those specified in advance,
The output of the non-designated student scanning switch circuit 6 causes the control circuit 2 corresponding to the student designated by the designated switch circuit 4 to
The output of the corresponding amplifier 1 is controlled to be blocked, and the output of the amplifier 1 corresponding to the undesignated student is sequentially supplied to the monitor amplifier 3.

Further, when sequentially monitoring students belonging to a pre-specified group, the output is supplied to the control circuit 2 of the student belonging to a group other than that specified by the group designation switch circuit 7, and the output of the corresponding amplifier 1 is blocked. The output of the amplifier 1 of the student belonging to the designated group is sequentially supplied to the monitor amplifier 3.

When sequentially monitoring students learning the same program, a signal is supplied to the control circuit 2 of the student other than the student learning the program designated by the program designation switch circuit 8, and the corresponding amplifier 1 is , and only the output of the amplifier 1 of the student learning the designated program is sequentially supplied to the monitor amplifier 3.

Further, when the push button of the manual operation switch circuit 14 is momentarily pressed, the output of the oscillator 11 is temporarily stopped, and one forward or reverse scanning signal is supplied to the shift register 9 through the selection circuit 12. The student following the currently monitored student will be monitored.

When the above-mentioned push button is held down, the cycle of the output of the oscillator 11 becomes a predetermined period of time due to the output of the switch circuit 14, and each student can be successively monitored for the same predetermined period of time.

Note that when the output of the amplifier 1 is blocked and the student is being scanned, the high-speed oscillator 10 is driven by the output of the control circuit 2, and a high-speed shift pulse is supplied to the shift register 9 through the selection circuit 12, and the designated The target student is scanned at high speed until it reaches the selected student.

Now, in the LL system device equipped with the above-mentioned monitor device, it is not enough to simply have the above-mentioned sequential monitoring function; It is also necessary to consider the appropriate transmission method.

However, since it is practically desirable to reduce the number of lines and switching circuits as much as possible, it is conceivable to put the control signal as a direct current on the program line itself.

However, in this case, if no measures are taken, a click will occur when the DC control signal is turned on and off, and the click sound will be audible to everyone's ears.

Therefore, the present invention attempts to solve the above-mentioned problems by providing a control signal generating circuit with a special configuration.

An example of a control signal generation circuit according to an embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, 15 (15-1 to 15-m) indicates a control signal generation circuit, which includes a switch SW1, a reverse current blocking diode D1, a click prevention capacitor C1, a voltage dividing resistor R
, R', an emitter follower transistor T, etc., and each output of the control signal generating circuits 15-1 to 15-n is applied to program lines P□ to Pm.

The m program lines P1 to Pm are connected to the student monitor 17 and the control device 16 via a program changeover switch SW0.

The input section of the control device 16 is, for example, a Zener diode,
Resistor R8, Ro', capacitor C8, transistor T.

consisting of a transistor T. The DC control signal SC obtained at the collector of is sent to the program selection device 18 etc.
Used to control program changes, etc.

For example, in the control signal generation circuit 15-1, no distortion occurs at the connection point A between the voltage dividing resistors R and R' even if a high-level audio signal is supplied to this point A from the program amplifier A-1. As shown in FIG. 3, a voltage 9 is applied in advance.

Thus, if the switch SW is now switched to the ON contact a1 or the OFF contact A1, the capacitor C is charged and discharged accordingly, and the voltage VB? VB
' are generated, but since these have waveforms as shown in FIG. 3, the output point E on the emitter side of the transistor T
A control signal that changes with a similar waveform is also output.

Therefore, this control signal is connected to the program line P~Pm.
Clicks will not be superimposed on the audio even if the audio is transmitted using .

Regardless of whether or not a program signal is flowing through the program line, program change control can be performed by operating the switch SW.

For example, even if the program source, such as a tape recorder, is stopped, the student monitor 17 can be switched and connected to another program line by operating the switch SW.

Since the emitter follower transistor T is used to lower the output impedance, the program line P1
Even if the number of student monitors 17 connected to Pm increases or decreases, level fluctuations in the program signal can be prevented.

You can also program the control line as before.
Since there is no need to provide it separately from the line, not only can the number of wire rods be significantly reduced, but the construction work can also be simplified.

Furthermore, the number of selection circuits on the student side is also reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional LL system device equipped with a monitor device, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram of its operation. 15-1 to 15-m: control signal generation circuit, 162 control device, SW: switch, C: click prevention capacitor,
11-1m Nibrogram line.

Claims (1)

[Scope of utility model registration request] In a LL system device configured to transmit a plurality of program signals from a tape recorder or the like via a plurality of program lines, a resistive voltage divider is provided in which a predetermined voltage is applied in advance to each of the program lines. an emitter follower transistor whose base is connected to a voltage division point of the transistor, a switch, and a click prevention capacitor, and the output of the click prevention capacitor that is charged and discharged by the switch is supplied to the base of the transistor. A control signal generation circuit is provided, and a DC control signal generated at the emitter of the transistor by turning on and off the switch is superimposed on the program signal and transmitted via the program line to change the program. The LL system device is configured to perform such control.