JPH03765Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transmitting/receiving device such as a transceiver.

[Conventional technology]

Generally, in a transceiver, when an earphone unit and a switch are combined, the earphone unit functions as an earphone when receiving data, and when the transceiver is in the transmitting state, the switch causes the earphone unit to function as a microphone. Earphones are suggested. Conventionally, such earphones that also function as a microphone use a special plug/jack or connector to connect to the transceiver due to their special function, and this prevents the user from accidentally inserting other earphones, microphones, etc. This prevents the transceiver from malfunctioning.

[Problem that the invention attempts to solve]

However, the use of such special plug jacks and connectors is undesirable from the standpoints of complicated and expensive structures and standardization of parts. Therefore, it is conceivable to use a stereo three-pole standard plug/jack, which is a common standard component, for this earphone that also functions as a microphone. In this case, using this standard part means
It must be ensured that no problem will occur even if an earphone, headphone, short plug, etc. having a plug of the same diameter is inserted into this three-pole standard jack. In particular, if the transceiver enters the transmitting state inadvertently, the user may unknowingly emit radio waves, and this must be avoided from the perspective of radio law and the operation of the transceiver.

In view of this, the present invention uses a three-prong standard plug/jack to avoid the above-mentioned problems, and also allows it to function as a transmitting/receiving device even when a standard plug for earphones, headphones, etc. is inserted into this jack. The purpose is to make you feel like you.

[Means for solving the problem] The present invention connects a series circuit of a connection switch 2 and a voltage drop element 3 between the first pole 1a and the second pole 1b, and also connects the first pole 1a and the second pole 1b. pole 1 of 3
A three-pole standard type jack 5 is connected to the three-pole standard type plug to which the microphone-cum-earphone unit 4 is connected between c, and the signal from the main body microphone 7 and the signal from the microphone-cum-earphone unit 4 are transmitted. It has a transmission signal switching circuit 9 that switches the transmission signal, and a discrimination circuit 6 that discriminates whether or not the voltage drop element 3 is present when the connection switch 2 of the microphone-cum-earphone is on. This transmitting/receiving device is characterized in that it controls a signal switching circuit 9.

[Effect]

According to the present invention, a voltage drop element 3 is provided in series with the connection switch 2, and this voltage drop element 3
A determination circuit 6 is provided to determine the presence or absence of a 3-pole standard plug, and the output signal of this determination circuit 6 controls whether or not to enter the transmitting state.・There is no inconvenience when using the jack, and even when a standard plug of another earphone, headphone, etc. is inserted into the jack 5, the signal from the microphone 7 of the main body is transmitted as a transmission signal, and the transmitting/receiving device functions. will not cause any harm.

〔Example〕

An embodiment of the transmitting/receiving device of the present invention will be described below with reference to the drawings.

FIGS. 1 and 3 show a microphone-cum-earphone used in this example. 1 and 3, reference numeral 1 indicates a three-pole standard plug, and a connection switch 2 and a resistor are connected between the first pole 1a and the second pole 1b of the three-pole standard plug 1. Connect the series circuit of device 3. In this case, the resistance value of this resistor 3 is, for example, 10KΩ, so that it can be distinguished from the resistance value of several Ω−several 10 Ω of the earphone unit of the headphone.

Further, a microphone/earphone unit 4 is connected between the first pole 1a and the third pole 1c. In this case, when the microphone earphone unit 4 is connected between the first pole 1a and the third pole 1c, the signal system becomes the signal system between the first pole 1a and the third pole 1c. Compatibility comes out.

Further, in FIG. 2, 5 indicates a three-pole standard type jack, and this three-pole standard type jack 5 connects the first, second, and third poles 1a, It has first, second and third poles 5a, 5b and 5c connected to terminals 1b and 1c, respectively, and when the three-pole standard plug 1 is not inserted, the second pole 5b is grounded, and the plug 1
When the plug 1 is not inserted, the output side of the audio amplification circuit 20 is connected to the speaker 10, and when the plug 1 is inserted, the output side of the audio amplification circuit 2 is connected to the speaker 10.
and a contact 5e that connects the output side of 0 to one fixed contact 21b of the changeover switch 21.

The first pole 5a of this three-pole standard type jack 5 is grounded, the third pole 5c is connected to the movable contact 21a of the changeover switch 21, and the second pole 5b is connected to a comparison circuit constituting the discrimination circuit 6. The second pole 5
b is connected to the power supply terminal +B via a resistor 11 having a resistance value of, for example, 12KΩ. In this case, power terminal +B
For example, the voltage supplied to the operational amplifier circuit 6a is set to 5.5V, and when the voltage supplied to the inverting input terminal is higher than the first reference voltage supplied to the non-inverting input terminal, for example 1.5V, this output side is set to low. The level is set to "0", and when the voltage is 1.5V or less, the output side is set to high level "1", and the operational amplifier circuit 6b is connected to the output terminal where the voltage supplied to the non-inverting input terminal is supplied to the inverting input terminal. For example, the reference voltage of 2
When the voltage is 3.7V or higher, this output side is set to high level “1”
When the voltage is below 3.7V, this output side is set to low level "0".

In this case, the operational amplifier circuit 6a is activated when nothing is plugged into the three-pole standard jack 5, or when the first and second poles 5a and 5b are short-circuited (when a normal earphone plug, etc. is inserted). ), this inverting input terminal is 0V, so this operational amplifier circuit 6
The output side of a becomes high level "1", and when a 3-prong standard plug is inserted into this jack 5,
When the first pole 1a and the second pole 1b are open or the resistor 3 is present, this inverting input terminal is
1.5V or more, this output side is low level “0”
becomes. When the 3-pole standard plug 1 of the microphone-cum-earphone shown in FIG. 1 is inserted, the operational amplifier circuit 6
The output side of a is low level "0".

In addition, the operational amplifier circuit 6b has this three-pole standard plug 1 inserted into the jack 5 and the connection switch 2.
When switch 2 is off, the voltage supplied to the non-inverting input terminal is the power supply voltage of 5.5V, and this output side is at high level "1", and when connection switch 2 is on, this non-inverting input terminal The voltage supplied to the power supply voltage is about 2.5V, which is the divided voltage of the resistors 11 and 3, and the output side is at low level “0”.
becomes.

The respective output signals of the operational amplifier circuits 6a and 6b are respectively supplied to the respective input terminals of the NOR gate circuit 6c. In this case, when the 3-pole standard plug 1 is inserted into the jack 5 and the connection switch 2 is turned on, the output sides of the operational amplifier circuits 6a and 6b become low level "0", and the NOR gate circuit 6
A control signal "1" is obtained at the output side of c. The output signal of this NOR gate circuit 6c sets the transmitting state.

In addition, in FIG.
3a, and one fixed contact 13R of this transmission/reception switch 13 is connected to an audio amplification circuit 20 via a front end circuit 14, an intermediate frequency amplification circuit 15, and a detection circuit 16 that constitute a reception system, and this audio amplification The output signal of the circuit 20 is supplied to the contact 5e. In this case, when the three-pole standard plug 1 of the microphone-cum-earphone is inserted into the jack 5, the output signal of the audio amplification circuit 20 is supplied to one fixed contact 21b of the changeover switch 21, and when receiving, this signal is The signal is supplied to the microphone/earphone unit 4.

Also, the other fixed contact 21c of the changeover switch 21
is connected to the other fixed contact 9c of the transmission signal switching circuit 9. Further, an output signal from a main body microphone 7, such as a microphone with a built-in hand microphone, provided in the main body of the transceiver is supplied to one fixed contact 9b of this transmission signal switching circuit 9, and a movable contact 9a of this transmission signal switching circuit 9 is used to transmit a signal. The signal is supplied to the modulation circuit 18 via the microphone amplifier circuit 8 and the low frequency amplifier circuit 17 that make up the system, and the output signal of the modulation circuit 18 is sent to the other fixed contact 13T of the transmit/receive switch 13 via the output amplifier circuit 19. supply Further, in this example, the movable contacts 21a and 1 of the changeover switches 21 and 13 are controlled by the output signal of the discrimination circuit 6, that is, the control signal obtained at the output side of the NOR gate circuit 6c.
3a. That is, when the output side of this NOR gate circuit 6c is at a low level "0", the movable contacts 21 of each of the changeover switches 21 and 13
a and 13a are connected to one of the fixed contacts 21b and 13R, respectively, to enter the reception state, and when the output side of this NOR gate circuit 6c is at high level "1", the movable contacts 21a and 13a are connected to the other fixed contact 21c, respectively. and 13T to enter the transmitting state.

Further, in this example, the variable contact 9a of the transmission signal switching circuit 9 is switched by the output signal of the operational amplifier circuit 6a. That is, this operational amplifier circuit 6a
When the output signal of the three-pole standard plug 1 of the microphone-cum-earphone shown in FIG. 1 is inserted into the jack 5 and the low level is "0", the movable contact 9a is connected to the other fixed contact 9c, and this calculation is performed. Amplification circuit 6a
When the output signal is at a high level "1" when a two-pole standard plug such as an earphone or headphone is inserted into the jack 5, the movable contact 9a is connected to one fixed contact 9b. When it is desired to transmit a signal from the main body microphone 7, a predetermined switching signal is supplied to the transmission switching signal input terminal 13S.

Since this example is constructed as described above, the standard three-pole plug 1 of the microphone-cum-earphone as shown in FIGS. 1 and 3 is connected to the standard three-pole jack 5 shown in FIG.
When the switch is inserted as shown in the figure and the connection switch 2 is turned on, the movable contacts 21a and 13a of the changeover switches 21 and 13 are connected to the other fixed contacts 21c and 3T, and the movable contact 9a of the transmission signal switching circuit 9 is connected to the other fixed contacts 21c and 3T. By connecting to the other fixed contact 9c, an audio signal from the microphone/earphone unit 4 can be transmitted. Further, when the connection switch 2 is turned off, the radio waves supplied to the antenna 12 are supplied to the microphone/earphone unit 4 via the reception system and can be received.

Also, when a standard two-pole plug of an ordinary earphone is inserted into this jack 5, the first and second poles 5a and 5b are short-circuited, and the output side of the operational amplifier circuit 6a becomes a high level "1", resulting in a NOR gate. circuit 6
The output side of c never becomes high level "1", and the movable contacts 21a and 13a of the changeover switches 21 and 13 are connected to one fixed contact 21b and 13R, respectively, and the movable contact of the transmission signal switching circuit 9 Contact 9a is connected to one fixed contact 9b. In this case, since the output signal of the main body microphone 7 is supplied to the transmission system, the transmission switching signal input terminal 13
If a switching signal is supplied to S, the transmitting state is set, and if this is not supplied, the receiving state is maintained as shown in FIG. The earphone unit becomes connected and receives sound from the earphone unit, allowing it to function as a transceiver. Furthermore, when a standard three-pole headphone plug is inserted into the jack 5, the resistance of the earphone unit connected between the first and second poles is small, and the output side of the operational amplifier circuit 6a is The high level becomes "1", which is the same as when the earphone with the standard two-pole plug described above is inserted into the jack 5, and the signal from the main body microphone 7 is transmitted and becomes a transceiver that can be received by this headphone.Also, nothing is inserted into the jack 5. If not, the signal from the main body microphone 7 is transmitted by supplying the switching signal supplied to the transmission switching signal input terminal 13S, and when this is not supplied, the signal from the antenna 12 is transmitted to the speaker 1.
0 makes it a regenerating transceiver. Further, even when various other plugs are inserted, unless a specific voltage determined by the resistor 3 connected in series with the connection switch 2 is present, the transmitting state will not occur inadvertently.

In the above embodiment, the resistor 3 was connected in series with the connection switch 2, but it is easily possible to obtain the same effect as described above even if another voltage drop element such as a Zener diode is used instead. I can understand. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations may be adopted without departing from the gist of the present invention.

[Effect of idea]

According to the present invention, a three-pole standard type plug/jack can be used because the transmitting state is not caused inadvertently, and the structure can be simplified and manufactured at low cost. Further, according to the present invention, since the standard type jack 5 can be used, the design of the set is easy to balance with other jacks, and the set does not look strange. Furthermore, according to this example, even when a standard plug for an ordinary earphone, headphone, etc. is inserted into the standard jack 5, a signal from the microphone 7 of the main body is transmitted as a transmission signal, and the earphone, headphone, etc. The transmitting/receiving device has the advantage of being able to perform multiple functions without any unnatural appearance.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the earphone that also functions as a microphone according to the present invention, Fig. 2 is a block diagram showing an embodiment of the transmitting/receiving device of the present invention, and Fig. 3 is a perspective view showing an example of the earphone that also functions as a microphone. , FIG. 4 is a perspective view showing an example of a transmitting/receiving device. 1 is a 3-pole standard plug, 2 is a connection switch, 3
is a resistor, 4 is an earphone unit that also serves as a microphone, 5
is a three-pole standard jack, 6 is a discrimination circuit, 7 is a main body microphone, 8 is a microphone amplifier circuit, and 9 is a transmission signal switching circuit.

Claims (1)

[Claims for Utility Model Registration] A series circuit of a connection switch and a voltage drop element is connected between the first pole and the second pole, and the first
A three-pole standard jack is configured such that a three-pole standard plug with a microphone-cum-earphone unit connected between the two poles and the third pole, and a signal from the main body microphone and a signal from the microphone-cum-earphone unit. A transmission signal switching circuit that switches the transmission of 1. A transmitting/receiving device comprising: a discrimination circuit for discriminating the difference in the level of voltage drop when a plug is inserted, and a discrimination circuit for discriminating a difference in the level of voltage drop when a plug is inserted.