JPS6340920Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a display device for a multi-call wireless communication device that allows a new device to communicate with each handset. (b) Background Art In a multi-call wireless communication device that performs simultaneous calls between a base unit having a number of channels with different transmission and reception frequencies, and a slave unit corresponding to the frequency of one channel of the base unit, The high frequency circuit, intermediate frequency circuit, and detection circuit for each channel of the parent device are provided independently, but the audio amplification circuit and speaker at the final stage are also used. As a result, it is not possible to identify which handset is generating the sound generated by the speaker, and therefore it may not be possible to issue appropriate commands in response to inquiries from the handset. (c) Means for solving the problem The present invention makes the operation indicator lamp provided for each channel blink when a signal from the handset is received, so that it is obvious at a glance which channel is receiving the signal. The present invention provides a display device for a multi-station wireless communication device that can be identified. (d) Embodiment The display device for a multi-station wireless communication device of the present invention will be explained with reference to the drawings. 1 is an antenna, 2a , 2b ... are a plurality of channels connected to the antenna 1, and each slave unit ( High frequency circuits 3a and 3b having a tuner tuned to the frequency of the transmitted signal (not shown)
...Intermediate frequency circuits 4a, 4b... and detection circuit 5a,
5b... 6 is the channel 2a , 2b
An audio amplification circuit 7 commonly connected to the output side of the audio amplification circuit 6 is a speaker driven by the output signal of the audio amplification circuit 6. 8a , 8b ... are display circuits provided in each of the channels 2a, 2b ..., and they all have the same configuration. Therefore, only the display circuit 8a connected to the channel 2a will be described in detail.
12 is a first transistor whose base is connected to the connection point of bleeder resistors 10 and 11 connected to the power supply circuit of the channel 2a . 13 is a light emitting diode connected between the collector of the first transistor 12 and the power supply circuit; 14 is a second transistor, the base of which is connected to the detection circuit 5a via a capacitor 15 and rectifying diodes 16, 16; It is connected to the base of the first transistor 12. Note that the base of the second transistor 14 may be connected to the intermediate frequency circuit 4a via a capacitor and a diode. Next, the operation of the multi-call radio communication device of the present invention will be explained. If you turn on the power switch 9a now, the channel 2 will pass through the power switch 9a.
A power supply voltage is supplied to each of the high frequency circuit 3a, intermediate frequency circuit 4a, and detection circuit 5a of channel 2a, thereby putting the channel 2a into an operating state. At this time, resistors 10, 11
Since the first transistor 12 is forward biased and turned on, the light emitting diode 13 emits light to indicate that the channel 2a is activated. The same goes for the other channels; when the power switch is turned on to put them into operation, the light emitting diodes of each channel emit light, indicating that the channel is in operation. By the way, for example, if a telephone call signal with the same frequency as the tuned frequency of channel 2a is generated from the handset,
After the call signal is received by the antenna 1, it enters the high frequency circuit 3a of the channel 2a and is amplified and frequency converted to form an intermediate frequency signal. The intermediate frequency signal is amplified by the intermediate frequency circuit 4a and then supplied to the detection circuit 6. There, it is converted into an audio signal, which is further amplified by an audio amplification circuit 6, and finally a speaker 7 is sounded. Therefore, the owner can listen to calls from the handset. On the other hand, a part of the detected audio signal is passed through a capacitor 15 to a rectifying diode 1.
6 and 16, and after being rectified, it is applied to the base of the second transistor 14, turning on the second transistor 14. When the second transistor 14 is turned on, the base voltage of the first transistor 12 decreases, turning off the first transistor 12 and extinguishing the light emitting diode 13 that was lit up until then.
Since the audio signal is a discontinuous signal, the bias voltage of the second transistor 14 disappears immediately, the second transistor 14 is turned off again, and the first transistor 12 is turned on. Therefore, the first transistor 1
Since channel 2 is turned on and off as long as there is a voice signal, the light emitting diode 13 blinks to notify channel 2a that a call signal from the handset is being received. Therefore, if the owner receives an inquiry from the handset,
If a transmitting circuit (not shown) of the channel 2a transmits a transmission signal having the same frequency as that of the receiving channel of the slave, communication with the slave is possible. (E) Effect As mentioned above, when the display device of the multi-call communication device of the present invention is turned on and put into operation,
The display element emits light to indicate that the channel is in operation, and when a signal from a slave unit is received, the display element blinks, allowing the owner of the base unit to know which slave unit to communicate with. It is possible to identify at a glance whether the device is connected to a designated handset, and to communicate accurately with a designated handset.

[Brief explanation of the drawing]

The figure is a circuit diagram of a display device of a multi-station wireless communication device of the present invention. 2a , 2b ... Channels, 3a, 3b ... High frequency circuits, 4a, 4b ... Intermediate frequency circuits, 5a, 5b ...
Detector circuit, 6... audio amplifier circuit, 8a , 8b ... display circuit, 9a, 9b... power switch, 12... first transistor, 13... light emitting diode, 14... second
Transistor.

Claims (1)

[Scope of utility model registration request] A high frequency circuit tuned to the frequency of a transmission signal transmitted from one of the many slave units, an intermediate frequency circuit connected to these high frequency circuits, and a detection circuit that detects the signal from the intermediate frequency circuit. a common audio amplification circuit connected to each channel; a power switch supplying power supply voltage to each circuit of each channel; and a resistor connected to the base of the power supply circuit of each channel. a first transistor to which a bias voltage is supplied through; a display element connected to the collector of the first transistor and a power supply circuit; a base connected to each channel circuit via a rectifier circuit; and a collector connected to the base of the first transistor. When the power switch is turned on, the first transistor is turned on by the bias voltage supplied through the resistor, and the display element is turned on. rectifying the signal taken out from the rectifier circuit, applying the rectified voltage to the base of a second transistor, turning on the second transistor and turning off the first transistor, and turning off the display element during that time; A display device for a multi-station wireless communication device, characterized by: