KR0123341Y1 - A radio and interphone - Google Patents

Abstract

The present invention provides a door call check means (7) for detecting a call signal applied from an external door line; Central control means (5) for generating a mute control signal, a switch control signal and a call control signal in accordance with an output of the door call check means or a key input signal; Radio receiving means (ANT, 1, 3, 4) for selectively receiving radio broadcast of a predetermined frequency in accordance with a mute control signal from said central control means; Audio output means (2, SP1, SP2) for selectively outputting the output of the radio receiving means or a call output for a call with an external door circuit part in accordance with a switch control signal from the central control means; And a call control means (8) for controlling transmission and reception of a call signal in accordance with a call control signal from the central control means (5). In this case, the radio broadcast can be paused and the interphone can function to maximize the user's convenience.

Description

Intercom

1 is a block diagram of an example of an intercom radio according to the present invention.

Figure 2a is another exemplary circuit diagram of the door call check unit shown in FIG.

FIG. 2B is another exemplary circuit diagram of the door call check unit shown in FIG.

3 is a diagram of the main internal signal waveforms of FIGS. 2A and 2B.

* Explanation of symbols for main parts of the drawings

1: AM / FM tuner 2: Audio amplifier

3: display part 4: mute control part

5: Central control unit (CPU) 6: Key input unit

7: door call check unit 8: call circuit unit

9: camera microphone

The present invention relates to an intercom combined radio, and more particularly to a radio having a function that can be used together by connecting the door intercom or video door phone.

In general, interphones and radios, such as door intercoms or video door phones, have existed as separate devices.

As such, existing as a separate device, for example, when there is a visitor's call from the entrance while listening to the radio broadcast in the kitchen, there is an inconvenience to move to the place where the interphone to operate the interphone.

Accordingly, the present invention has been made to solve the above problems, and provides an intercom combined radio to stop the radio broadcast for a while and perform the function of the interphone when there is a visitor call from the front door while listening to the radio broadcast. The purpose is.

In order to achieve the above object, the present invention, an intercom radio, door call check means for detecting a call signal applied from an external door line; Central control means for generating a mute control signal, a switch control signal and a call control signal in accordance with the output of the fraud door call check means or a key input signal; Radio reception means for selectively receiving radio broadcast of a predetermined frequency in accordance with a mute control signal from the central control means; Audio output means for selectively outputting the output of the radio receiving means or a call output for a call with an external door circuit part in accordance with a switch control signal from the central control means; And call control means for controlling transmission and reception of a call signal between the audio output means and an external door circuit portion in accordance with a call control signal from the central control means.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 is an example block diagram of an intercom radio according to the present invention. As shown in the drawing, an antenna (ANT), an AM / FM tuner (1), an audio amplifier (2), a display unit (3), Mute control unit 4, central processing unit (CPU), key input unit 6, door call check unit 7, call circuit unit 8, camera microphone 9, speaker ((SP1, SP2) is provided.

Here, the AM / FM tuner 1 detects and synchronizes a desired specific frequency among radio frequencies input through the antenna ANT, and the audio amplifier 2 selectively selects the signal according to a switch control signal from the CPU 5. The output of the AM / FM tuner 1 is amplified and input to the speakers SP1 and SP2.

The display section 3 indicates the selected frequency of the AM / FM tuner 1, or indicates the current time or operating state in accordance with the display control signal from the CPU 5, and the mute control section 4 displays the CPU 5 The AM / FM tuner 1 is disabled in response to the mute control signal from the radio broadcast to be listened to through the audio amplifier 2.

The call circuit section 8 controls the call between the door circuit section including the camera microphone 9 and the audio amplifier 2 according to the call control signal from the CPU 5. This call circuit section 8 is a circuit generally used in a conventional apparatus such as a telephone, and a detailed description thereof will be omitted.

The door call check unit 7 detects and transmits a call signal applied through the door line # 1 to the CPU 5. For this purpose, the voltage level is adjusted and the timing is appropriately adjusted according to the CPU 5.

The CPU 5 generates a display control signal, a mute control signal, a switch control signal, and a call control signal in accordance with the input signal from the key input unit 6 and the output signal of the door call check unit 7 to display the display unit 3. Control of the mute control unit 4, the audio amplifier 2, the call circuit unit 8, and the like.

FIG. 2A is a detailed circuit diagram of an example of the door call check unit 7 shown in FIG. 1, and FIG. 2B is another exemplary detailed circuit diagram of the door call check unit 7, which is the same as that of FIGS. 2A and 2B. As shown in FIG. 3 showing the waveform of the main internal signal (signal applied to each node A, B, C), the visitor's call signal is too short for the CPU 5 to recognize (10 ms in this embodiment). ), The CPU 5 has a function of delaying (30 ms in this embodiment) and converting the output appropriately so as to be recognized by the CPU 5.

In one embodiment of the door call check unit 7, as shown in FIG. 2A, the PNP transistor 11 is turned on and off in response to a signal applied to the door line, and is selectively supplied according to the operation of the PNP transistor 11. The delay unit 12 delays the power supply voltage Vcc for a predetermined time, the NPN transistor 13 turned on and off according to the signal delayed by the delay unit 12, and the operation of the NPN transistor 13. The resistor R is configured to divide the power supply voltage Vcc into a voltage suitable for the operation of the CPU 5 and output the divided voltage.

Another embodiment of the door call check unit 7 is a delay unit 21 for delaying a signal applied to the door line for a predetermined time as shown in FIG. 2B, and a signal delayed by the delay unit 21 is applied. A receiving buffer unit 22 is provided. Here, in another embodiment of the present invention, a two-input AND gate receiving the same signal into the buffer unit 22 is used.

The operation of the present invention configured as described above will be described.

When the signal applied to the door line transitions from the high level to the low level, the CPU 5 recognizes this, and the CPU 5 that recognizes the signal is an AM / FM tuner 1, A mute control signal for about 4 seconds is supplied to a radio receiver including the audio amplifier 2 and the mute control unit 4 to form a mute state. Subsequently, the call signal is received through the door line and the call sound is emitted to the speakers SP1 and SP2 through the call circuit unit 8.

After 4 seconds, the mute state is canceled and the radio is switched again. At this time, when the user presses the interphone function button on the key input unit 6, the mute state is switched to the mute state for about 60 seconds. To control.

The present invention made as described above has a peculiar effect of maximizing the user's convenience by stopping the radio broadcast and performing the function of the interphone when there is a visitor call while listening to the radio broadcast.

Claims (7)

An intercom radio, comprising: door call check means (7) for detecting a call signal applied from an external door line; Central control means (5) for generating a mute control signal, a switch control signal and a call control signal in accordance with an output of the door call tech means or a key input signal; Radio receiving means (ANT, 1, 3, 4) for selectively receiving radio broadcast of a predetermined frequency according to a mute control signal from the central control means; Audio output means (2, SP1, SP2) for selectively outputting the output of the radio reception means or a call output for a call with an external door circuit part in accordance with a switch control signal from the central control means; And call control means (8) for controlling transmission and reception of a call signal between the audio output means and the outer door circuit portion in accordance with a call control signal from the central control means (5). The radio receiver of claim 1, wherein the radio receiving means (ANT, 2, 3, 4) comprises: an antenna (ANT); An AM / FM tuner (1) for detecting and synchronizing a desired specific frequency among radio frequencies input through the antenna (ANT); And a mute control unit (4) for disabling the AM / FM tuner (1) in accordance with the mute control signal from the central control unit (5). The display unit according to claim 2, wherein the radio receiving means (ANT, 1, 3, 4) visually displays predetermined information including the selected frequency of the AM / FM tuner 1 under the control of the central control means. 3) intercom combined radio characterized in that it further comprises. The intercom combiner according to any one of claims 1 to 3, wherein the door call check means is configured to convert a call signal from the door line to be appropriately recognized by the central control means. radio. 5. The method of claim 4, wherein the door call check means comprises: a PNP transistor (11) for turning on and off according to a signal applied to a door line to selectively supply a power supply voltage (Vcc); operation of the PNP transistor (11) The first delay unit 12 for delaying the power supply voltage (Vcc) selectively supplied according to the predetermined time, and the NPN transistor 13 is turned on, off in accordance with the signal delayed by the first delay unit 12 Intercom combined use radio characterized in that. 6. The intercom radio according to claim 5, wherein the door call check means further comprises a resistor (R) configured to divide and output a power supply voltage (Vcc) according to the operation of the NPN transistor (13). The method of claim 4, wherein the door call check means comprises a second delay unit (21) for delaying a signal applied to the door line for a predetermined time; And a buffer unit (22) for receiving a signal delayed by the second delay unit (21).