JPH02216647A - Remote controller for acoustic device - Google Patents

Abstract

PURPOSE:To prevent the malfunction for insertion of the plug of a headphone having no remote controllers by using the state change of the grounding operation of two control terminals provided in a headphone jack to control a power source supply operation to a switching element provided for remote control operation. CONSTITUTION:When a headphone plug 44 is inserted to a headphone jack 5, a first control terminal 9, namely, the emitter of a control transistor TR 12 and a second control terminal 10, namely, the cathode of a diode 15 are grounded through a ground plug terminal 47 and a ground terminal 8. A diode having a threshold voltage lower than that of the control TR 12 is used as the diode 15 to prevent inversion of the control TR 12 to the conductive state. Consequently, a power supply TR 11 is in the non-conductive state and power is not supplied to a remote control switching circuit. The malfunction of a remote control circuit does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to audio equipment such as tape recorders, and particularly to remote control devices.

(b) Prior Art Recently, audio equipment called a headphone stereo, in which signals such as music played from a tape recorder are played back and listened to through headphones, has become popular. Such audio equipment is generally used with the main unit stored in a bag, etc., so when switching the tape recorder, it is necessary to remove it from the main unit from the bag, which is extremely inconvenient. It is something. As a technique that improves this point, there is a technique in which a remote control device for switching the operation of a tape recorder is incorporated into headphones, and such a technique is disclosed, for example, in Japanese Utility Model Application Publication No. 59693/1983.

(c) Problems to be Solved by the Invention The plug of headphones used in audio equipment configured to listen to reproduced signals through headphones with a remote control has a special structure, and the headphones into which the plug is inserted The jack also has a special structure. If you insert the plug of an ordinary headphone, that is, a headphone that does not have a remote control device, into an audio amplifier configured in this way, it will malfunction, so conventional audio equipment has been divided into headphones with a remote control and headphones without a remote control. A selection switch was included to select between. When such a selection switch is incorporated into a small-sized audio device, there are restrictions on its mounting position, and there are problems in that the user may forget to operate the selection switch. The present invention aims to provide a remote control device that is improved in this respect.

(d) Means for Solving the Problems The remote control device of the present invention is connected to a signal terminal to which a signal amplified by an amplifier circuit is applied, a ground terminal, and a ground terminal when a headphone plug is inserted. The headphone jack has a second control terminal that is connected to the ground terminal when the first control terminal and no remote control headphone plug is inserted, and the remote control operation switch provided on the remote control device headphone is pressed and closed. a switching element that performs an inverted operation and outputs a signal for switching the operation when the first control terminal and the second control terminal are grounded; It is composed of circuits.

(E) Function The present invention utilizes changes in the grounding state of two control terminals provided in the headphone jack to control the power supply operation to the switching element provided for remote control operation. This is what I did.

(f) The drawings of the embodiments are all related to the present invention, and Fig. 1 is a circuit diagram incorporated in the zero body of the audio equipment, Fig. 2 is a circuit diagram showing the connection relationship of headphones with a remote control, and Fig. 3 is a remote control. FIG. 3 is a circuit diagram showing the connection relationship of headphones without headphones. In Figure 1, (1) is the first signal input terminal to which the left channel signal reproduced from the magnetic tape is applied, and (2) is the first signal input terminal to which the signal applied to the first signal input terminal (1) is input. (3) is a second signal input terminal to which the right channel signal reproduced from the magnetic tape is applied; (4) is the second signal input terminal (3); A second amplification circuit receives the applied signal and amplifies the signal. (5) is a headphone jack into which a headphone plug is inserted, and the first amplifier circuit (2)
a first signal terminal (6) connected to the output terminal of the second amplifier circuit (4), a second signal terminal (7) connected to the output terminal of the second amplifier circuit (4), a ground terminal (8) that is grounded; A first control terminal (9) that can be connected to the ground terminal (8) by a companion plug when a headphone plug is inserted, and a first control terminal (9) that can be connected to the ground terminal (8) by the plug when a headphone plug without remote control is inserted. It is equipped with a second control terminal (10) that can be disconnected. (11) is a power supply transistor for controlling power supply to a remote control switching circuit, which will be described later, and its emitter is connected to a power supply. (12) is the power supply transistor (1
a control transistor whose collector is connected to the base via the resistor (13) and whose emitter is connected to the first control terminal (9) of the headphone jack (5) to control the operation of the headphone jack (5); Its base is connected to the power supply via a resistor (14) and to the second control terminal (10) via a diode (15). (16) is a first switching transistor whose emitter is connected to the collector of the power supply transistor (11) and whose collector is grounded via a resistor (17), and whose base is connected to the collector of the power supply transistor (11).
8), (19), (20) and diode (2
1) is connected to the collector of the power supply transistor (11). Further, the connection point (A) between the resistor (19) and the resistor (20) is connected to the first signal terminal (6) of the headphone jack (5), and the resistor (18) is connected to the first signal terminal (6) of the headphone jack (5).
) and the resistor (19〉), a capacitor (z2) is connected between the connection point (B) and the ground.The emitter of (23) is connected to the collector of the power supply transistor (11), and a second switching transistor whose collector is grounded via a resistor (24), and whose base is connected to resistors (25), (26), (2
7) and the collector of the power supply transistor (11) via a diode (21). Further, the connection point (C) between the resistor (26) and the resistor (27) is the second signal terminal (7) of the headphone jack (5).
and the connection point between resistor (25) and resistor (26) (
A capacitor (28) is connected between D) and ground. (29) is a third switching transistor whose emitter is connected to the collector of the power supply transistor (11) and whose collector is grounded via a resistor (30), and whose base is connected to the resistor (31).
via the second control terminal of the headphone jack (5) (
10). (32) is a control circuit that controls operation switching of the tape recorder, including a fast forward switching signal input terminal (33) and a rewind switching signal input terminal (33).
4) and a reproduction switching signal input terminal (35). In such a configuration, the control circuit (32) performs a switching operation when an L (low) level signal is input to each switching signal input terminal, and performs a switching operation for regeneration when in each operating state such as regeneration. It is configured such that when an L level signal is input to the signal input terminal (35), it is switched to the stop state. (36) is a first switching transistor whose collector is connected to the fast-forward switching signal input terminal (33) and whose emitter is grounded, and whose base is connected to the first switch via a resistor (37). It is not connected to the collector of the switching transistor (16). (
38), the collector is connected to the rewinding switching signal input terminal (38).
4) and whose emitter is grounded, and whose base is connected to the resistor (
39) through the second switching transistor (
23). (40) is a third switching transistor whose collector is connected to the reproduction switching signal input terminal (35) and whose emitter is grounded, and whose base is connected to the third switch via a resistor (41). It is connected to the collector of the switching transistor (29). (42) is the diode (21)
) is a capacitor connected between the cathode and ground, and has the effect of bypassing noise from the motor that enters the power supply. (43) is a capacitor connected between the second control terminal (10) of the headphone jack (5) and the ground, and prevents the third switching transistor (29) from being turned into a conductive state due to inductive noise or the like. It has the effect of preventing Further, the capacitors (22) and (28) are connected to the first amplifier circuit by the signals amplified by the first amplifier circuit (2) and the second amplifier circuit (4).
It has the function of preventing the switching transistor (16) and the second switching transistor (23) from being reversed to a conductive state. The circuit built into the main body of the audio device is configured as described above, and next, the configuration of the headphone will be explained.

First, ordinary headphones without a built-in remote control device will be explained with reference to FIG. In the same figure,
(44) is a headphone plug, which includes a first signal plug terminal (45) that contacts the first signal terminal (6) when inserted into the headphone jack (5), and a second signal terminal (7).
), a second signal plug terminal (46) and a ground terminal (8), a first control terminal (9) and a second control terminal (10
) is provided with a grounding plug terminal (47) in contact with the
(48) is a left channel speaker, which is connected between the first signal plug terminal (45) and the ground plug terminal (47). (49) is a right channel speaker, which is connected between the second signal plug terminal (46) and the ground plug terminal (47>).

A normal headphone is constructed as described above.Next, a headphone incorporating a remote control device will be explained with reference to FIG. 2. In the figure, (50) is a headphone plug, which contacts the first signal plug terminal (51) and the second signal terminal (7) when inserted into the headphone jack (5). a second signal plug terminal (52) in contact with the grounding terminal (8) and a grounding plug terminal (53) in contact with the first control terminal (9);
and a control plug terminal (
54). (55) is a fast-forward operation switch that is pressed and closed during fast-forward operation, and together with the resistor (56), the first signal plug terminal (51) and the ground plug terminal (
53>. (57) and (58
) is a capacitor and a first variable resistor connected in series between the first signal plug terminal (51) and the grounding plug terminal (53), and a slider of the first variable resistor (58) A left channel speaker (59) is connected between (58a) and the ground plug terminal (53). (
Reference numeral 60) is a rewind operation switch that is pressed and closed during rewind operation, and is connected together with a resistor (61) between the second signal plug terminal (52) and the ground plug terminal (53). (62) and (63) are a capacitor and a second variable resistor connected in series between the second signal plug terminal (52) and the ground plug terminal (53), and the second variable resistor ( The right channel speaker (63) is connected between the slider (63a) of the
64) is connected. (65) is a regeneration operation switch that is suppressed and opened during regeneration operation and stop operation;
It is connected together with a resistor (66) between the control plug terminal (54) and the ground plug terminal (53).

The present invention is constructed as described above, and its operation will be explained next. When the headphone plug is not inserted into the headphone jack (5), the first control terminal (
9> is not grounded, the control transistor (12
) is in a non-conducting state, and the control transistor (12)
A power supply transistor whose operation is controlled by
11) is in a non-conducting state. Hence the switching transistor (16).

(23), <29), etc. In such a state, when the plug (50) of the headphone with remote control shown in Fig. 2 is
) into the headphone jack (5), the first signal plug terminal (51), second signal plug terminal (52), grounding plug terminal (53) and control plug terminal (54) are connected to the first signal terminal (6), respectively. , a second signal terminal (7), a ground terminal (8), a first control terminal (9) and a second control terminal (10).
be in contact with. In such a state, the first control terminal (9), ie the emitter of the control transistor (12), is connected to the ground plug terminal (53) of the headphone plug (50).
) and ground through the ground terminal (8) so that the control transistor (12) is biased into a conductive state. When the control transistor (12) becomes conductive, the power supply transistor (11) is connected so that its operation is controlled by the control transistor (12).
) is biased and becomes conductive. When the power supply transistor (11) becomes conductive, power is supplied to the emitters of the first switching transistor (16), the second switching transistor (23), and the third switching transistor (29). A diode (21) is installed at the base of the first switching transistor (16) and the second switching transistor (23).
Because a high voltage is incorrectly applied through the third switching transistor (29), and because a bias circuit is not formed at the base of the third switching transistor (29), each switching transistor (16)
, (23), and (29) are in a non-conducting state. When the playback operation switch (65) provided on the headphones is pressed and closed in such a state, a resistance (
31), second control terminal (10), control plug terminal (54)
), the resistor (66), the playback operation switch (65), the grounding plug terminal (53), and the grounding terminal (8) so that the base current of the third switching transistor (29) flows through the third switching transistor (29). ) is reversed to conductive state. The third switching transistor (
29) is reversed to a conductive state, the third switching transistor (40>) is biased and reversed to a conductive state, thereby grounding the reproduction switching signal input terminal (35) provided in the control circuit (32). As a result, the control circuit (32)
A switching operation is performed, and the tape recorder is switched to the playback operation state. The left and right channel signals recorded on the magnetic tape are reproduced by a magnetic head (not shown) and then applied to a first signal input terminal (1) and a second signal input terminal (3). 1 signal input terminal (1>
The left channel signal applied to the first amplifier circuit (2
) and is amplified, the first signal terminal (6), the first signal plug terminal (51), the capacitor (57), the first variable resistor (58), the grounding plug terminal (53) and the grounding terminal. (through the left channel speaker (59)
), and the sound is emitted by the left channel speaker (59). Further, the right channel signal applied to the second signal input terminal (3) is sent to the second amplifier circuit (4).
After being input to and amplified by the second signal terminal (7), the second
Signal plug terminal (52), capacitor (62), 2nd
Right channel speaker (64) through variable resistor (63), ground plug terminal (53) and ground terminal (8)
and the sound is emitted by the right channel speaker (8φ). In this way, the operation of listening to the signal reproduced from the magnetic tape is performed, but the first variable resistor (
58) and the slider (58a) of the second variable resistor (63)
, (63a), the volume can be adjusted. When the regeneration operation switch (65) is pressed and closed in such a regeneration operation state, the third switching transistor (29) is activated as described above.
) and the third switching transistor (40) are inverted to conductive states, thereby grounding the reproduction switching signal input terminal (35) provided in the control circuit (32). As a result, a switching operation is performed by the control circuit (32) and the tape recorder is switched to a stopped state.

Although the switching operation to the playback operation state is performed as described above,
Next, the fast forward operation will be explained. When the user presses and closes the fast-forward operation switch (55) provided on the headphones, the resistors (18), (19), the first signal terminal (6), the first signal plug terminal (51), and the resistor ( 5
6) The base current of the first switching transistor (16) flows through the fast-forward operation switch (55), the ground plug terminal (53), and the ground terminal (8), and the first switching transistor (16) is in a conductive state. to be reversed. When the first switching transistor (16) is turned into a conductive state, the first switching transistor (36)
is biased and reversed to a conductive state, and the control circuit (32)
The fast-forward switching signal input terminal (33) provided in the terminal is grounded. As a result, a switching operation is performed by the control circuit (32) and the tape recorder is switched to the fast forward operating state. When the regeneration operation switch (65) is pressed to close in such a fast-forward operation state, as described above, the third switching transistor (40) is inverted to the conductive state, and the control circuit (32) is switched on. The playback switching signal input terminal (35) connected to the playback signal input terminal (35) is grounded. As a result, the control circuit (32) performs a switching operation and the tape recorder is switched to a stopped state.

The switching operation to the fast forward operation state is performed as described above, but the rewinding operation will be explained next. When the rewinding operation switch (60) is suppressed and opened, the resistance (25)
(26), second signal terminal (7), second signal plug terminal (
52), resistor (61), rewind operation switch (60)
The base current of the second switching transistor (23) flows through the ground plug terminal (53) and the ground terminal (8), and the second switching transistor (23) is turned into a conductive state. When the second switching transistor (23) is reversed to a conductive state, the second switching transistor (38) is biased and reversed to a conductive state;
The rewind switching signal input terminal (34) provided in the control circuit (32) is grounded.

As a result, a switching operation is performed by the control circuit (32), and the tape recorder is switched to the rewind operation state.

When the playback operation switch (65) is pressed and closed in such a rewinding state, the third
By inverting the switching transistor (40) to the conductive state, the reproduction switching signal input terminal (35) provided in the control circuit (32) is grounded. As a result, the control circuit (32) performs a switching operation and the tape recorder is switched to a stopped state.

As described above, each operation is performed once when using headphones with a remote control.Next, the operations when using headphones without a remote control shown in FIG. 3 will be explained.

When the headphone plug (44) shown in Figure 3 is inserted into the headphone jack (5), the first signal plug terminal (
45) and the second signal plug terminal (46) are in contact with the first signal terminal (6) and the second signal terminal (7), respectively, and the grounding plug terminal (47) is in contact with the grounding terminal (8) and the first control terminal. 9) and the second control terminal (10). Therefore, in such a state, the first control terminal (9), that is, the emitter of the control transistor (12) and the second control terminal (
10) That is, the cathode of the diode (15) is grounded through the ground plug terminal (47) and the ground terminal (8). If a diode made of germanium or the like having a rising voltage characteristic lower than that of the control transistor (12) is used as the diode (15), the control transistor (12) will not be reversed to a conductive state. Supply transistor 11
) is in a non-conducting state and no power is supplied to the remote control switching circuit, so the remote control circuit will not malfunction.In such a state, if you operate the operation button on the audio equipment, the table recorder will play, etc. can be done.

In this embodiment, fast forwarding, rewinding, and switching to the playback operating state are performed using the remote control, but various switching operations can be performed by a combination of switching signals input to the control circuit (32). You can also do that.

(G) Effects of the Invention The present invention controls the power supply operation to the switching element provided for remote control operation by using changes in the state of the grounding operation of the two control terminals provided in the headphone jack. This prevents malfunctions when the plug of a remote-controlled headphone is inserted.With this arrangement, there is no need to provide an operation switch to prevent malfunctions, and the present invention can be implemented in ultra-small audio equipment. If you do so, it will have a very large effect.

[Brief explanation of the drawing]

The drawings all relate to the remote control device of the present invention, and FIG. 1 is a circuit diagram incorporated in the main body of the audio equipment;
FIG. 2 is a circuit diagram showing the connection relationship of headphones with a remote control, and FIG. 3 is a circuit diagram showing the connection relationship of headphones without a remote control. Explanation of main drawing numbers (5)...headphone jack, (6)...1st
Signal terminal, (7)...Second signal terminal, (8)...
・Grounding terminal, (9)...first control terminal, (10)・
...Second control terminal, (11)...Power supply transistor (12)...Control transistor (1
6)...First switching transistor (23
)...Second switching transistor (29)
...Third switching transistor, (32)
...Control circuit, (36)...First switching transistor (38)...Second switching transistor
(40)...Third switching transistor (44)
(50)... Headphone plug, (45) (51
)...First signal plug terminal, (46)(52)...
・Second signal plug terminal, (47)(53)...Ground plug terminal, (48)(59)...Speaker for left channel (49) (64)...Speaker for right channel (54)・...Control plug terminal, (5
5)... Operation switch for fast forwarding, (60)... Operation switch for rewinding, (65)... Operation switch for playback. 1

Claims (1)

[Claims] (1) In an audio device configured to listen to reproduced signals through headphones, a signal terminal to which a signal amplified by an amplifier circuit is applied, a ground terminal, and a connection to the ground terminal when a headphone plug is inserted. a headphone jack having a first control terminal connected to the ground terminal when the plug of the headphone without remote control is inserted; a switching element that operates in reverse when the remote control operation switch is pressed and closed and outputs a signal for switching the operation;
A remote control device for audio equipment comprising a power supply control circuit whose operation is controlled by grounding operations of the first control terminal and the second control terminal and which controls power supply to the switching element.