JPS6325744B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intercom with a radio.

These days, many housewives listen to the radio while doing housework, so even if the intercom rings while the radio is playing, you may not be able to hear it.

Also, it was difficult to hear what was said over the intercom when the radio was on, so each time the intercom rang, the radio had to be turned down or turned off, which was extremely annoying.

Therefore, the present invention provides an intercom with a radio that automatically lowers or turns off the volume of the radio while the intercom is in use.

An embodiment of the present invention will be described below based on the drawings. In Fig. 1, 1 is the main unit of the intercom;
2 is a child organ. The master device 1 is provided with a handset 3, a radio 4, and a clock 5. The speaker 4a of the radio 4 generates radio broadcasts, intercom chime sounds, and clock alarm sounds.

The clock 5 also includes a time switch circuit, which connects other electrical equipment to the outlet 5a and turns it on or off at a desired time.

FIG. 2 shows the circuit configuration of the master unit 1, and the 6
7 is an intercom circuit, and 7 is a chime circuit. Two types of chime sounds are prepared: an intercom chime sound and a chime sound as a clock alarm sound. 8 is a clock circuit, 9 is a time switch circuit, 10 is a radio circuit, 11 is a control circuit to be described later, and 12 is an amplifier circuit. Reference numeral 13 denotes a manual changeover switch for selecting whether to sound a chime or a radio as an alarm.

FIG. 3 shows an example of the control circuit 11.
14 is a flip-flop circuit, 15 is a level conversion circuit, 16 is a chattering removal circuit, 17 to 19
2 is a switching circuit, 20 is a resistor, and 21 is a gate circuit.

Next, the operation will be explained. When a visitor comes and the switch 2b of the intercom slave device 2 is pressed while the radio is currently playing, a chime signal is generated from the chime circuit 7. This chime signal is the third
The signal is supplied to the terminal 7a in the figure, the level is converted, and the flip-flop circuit 14 is set. Now terminal 8
It is assumed that a is held at "0" and the gate circuit 21 is open. Therefore, the switching circuits 18 and 19 are turned on and off, respectively, and the output from the radio circuit 10 is cut off, and a chime sound is generated from the speaker 4a. Therefore, the chime sound is not drowned out by the radio broadcast, and the user can immediately pick up the handset 3 and respond. This conversation is also uninterrupted by radio broadcasts. After answering, turn off the handset 3
When the flip-flop circuit 14 is returned, the hook signal is supplied to the terminal 3a in FIG. 3, and the flip-flop circuit 14 is reset. This returns the speaker 4a to its original state.
The radio broadcast will be played again.

Note that in the above example, radio broadcasting is cut off while the intercom is in use, but the volume is not limited to this, and the volume may be lowered.

Next, the functions of the clock 5 will be explained. The output terminal 8a of the clock circuit 8 shown in FIG. 2 is set to generate an output at night, for example from 7:00 pm to 7:00 am. This output turns on the switching circuit 17 in FIG. 3 and also turns on the gate circuit 2.
An output of 1 keeps switching circuit 18 off. Therefore, the chime signal from the terminal 7a passes through the resistor 20, and the volume of the chime sound at night becomes low.

Further, an alarm output is generated from the terminal 8b of the clock circuit 8 at a preset time. This alarm output causes a chime sound or a radio to sound, and the selection is made by the switch 13.

Further, the time switch circuit 9 supplies or cuts off power to the outlet 5a at a set time based on the output from the clock circuit 8, and turns on or off external electrical equipment. Generally, the intercom base unit 1 is often installed in the kitchen, so by providing the above-mentioned time switch function, it is possible to control the time of electrical equipment used in the kitchen.

As described above, according to the present invention, a radio is added to the intercom, and when the call switch is operated, the audio signal from the radio circuit is cut off or the volume is lowered, and the audio signal from the intercom circuit is supplied to the sound generation device. However, since the audio signal from the radio circuit is supplied to the sound generating device again by the hook signal when the handset is turned on, there is no need to perform special operations even if a visitor arrives while listening to the radio broadcast. The user can answer the call without being disturbed by the radio broadcast, and when the call is over and the handset is returned, the radio broadcast automatically switches, eliminating the need for special operations to switch. It is something.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a block diagram showing an example of the circuit configuration, and FIG.
The figure is an electric circuit diagram showing in detail the main parts of FIG. 1...Interphone main device, 2...Interphone slave device, 4...Radio, 11...Control circuit.

Claims (1)

[Claims] 1. A slave unit with an intercom call switch, a master unit with a handset and radio circuit,
A sounding device that emits an audio signal from a radio circuit and an audio signal from an intercom circuit, and becomes one operating state when a call switch of the intercom is operated, and enters another operating state when an on-hook signal from the handset is received. a memory circuit; and an output of the above-mentioned one operating state of the memory circuit to cut off or reduce the volume of the audio signal from the radio circuit, select the audio signal from the intercom circuit, and output the above-mentioned other operating state. and a selection circuit for selecting an audio signal from the radio circuit and supplying the selected audio signal to the sound generation device.