JP2010232757A - Intercom system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intercom system that adjusts an intercom to a suitable speech communication switching level according to the environment wherein the intercom is installed. <P>SOLUTION: The intercom system enters a speech communication switching adjustment mode wherein suitable speech communication switching is performed without reference to an ambient noise level and an installation place state, and transmits a frequency spread signal whose audio band frequency is spread from a master unit CPU of a master unit to an automatic alternate speech communication circuit when entering the speech communication switching adjustment mode. The intercom system inputs a speech signal from a master unit microphone to the automatic alternate speech communication circuit, compares the frequency spread signal with the speech signal to transmits a state signal from the automatic alternate speech communication circuit to the master unit CPU, and varies through a fist electronic variable resistor the speech level input from the master unit microphone so as to vary a level of switching in response to the state signal. Then, the speech level from the master unit microphone which has been adjusted through the first electronic variable resistor is varied through a second electronic variable resistor to be equal to a speech level to a predetermined slave unit, thereby achieving suitable automatic alternate speech communication. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an automatic intercom intercom system, and more particularly to an intercom system that can automatically adjust the switching of calls to an appropriate level.

Conventionally, interphone systems that use a handset (handset) have been the mainstream, but in recent years, hands-free type intercom systems that can be operated even when the hands are full have been used. Many. Usually, the hands-free intercom system is an automatic alternating communication system, and the level of the voice from the slave unit and the voice from the master unit are compared, and the higher one is made effective.

JP-A-11-239344

However, when making a hands-free call, there are cases where the noise level varies due to reasons such as construction around the slave unit, and transmission / reception may not be switched appropriately depending on the installation location.

The present invention has been made to solve the above-mentioned problems, and transmits a frequency spread signal in which a frequency of a voice band is spread to the automatic alternating communication circuit when the master CPU of the master unit shifts to a call switching adjustment mode. Another object of the present invention is to provide an intercom system that can automatically adjust the switching of calls to an appropriate level by inputting and comparing a voice signal from a base unit microphone to the automatic alternate call circuit.

The intercom system according to the present invention includes a slave unit for a visitor to call a resident and make a call, and a parent for a resident who has confirmed the call from the slave unit to make a call with the visitor. The intercom system is an intercom system that has an automatic alternate call circuit that switches the voice from the slave unit and the voice spoken by the occupant to the louder one by comparing the voice from the slave unit and the voice spoken by the resident. Regardless of the mode, the system switches to a call switching adjustment mode for performing appropriate call switching, and when the main unit CPU shifts to the call switching adjustment mode, a frequency spread signal obtained by spreading the frequency of the voice band is transmitted to the automatic alternating call circuit. The voice signal is input from the master microphone to the automatic alternating communication circuit, the frequency spread signal and the voice signal are compared, and the status signal is transmitted from the automatic alternating communication circuit to the master CPU. In order to change the switching level based on the sound level, the sound level input from the base unit microphone is changed by the first electronic volume, and the sound level from the base unit microphone adjusted by the first electronic volume is predetermined. In order to make it the same as the voice level to the slave unit, an appropriate automatic alternate call is realized by changing the second electronic volume.

In addition, the intercom system according to the present invention allows a visitor to call a resident and make a call, and a resident who has confirmed the call from the slave makes a call between the visitor and the visitor. Of the external device and the adapter installed between the slave unit and the external device, the adapter compares the voice from the slave unit with the voice spoken by the resident in the external device and switches to the higher volume automatically. An intercom system with a call circuit that switches to a call switching adjustment mode for appropriate call switching regardless of the ambient noise level and installation location, and then switches from the external device CPU of the external device to the call switching adjustment mode. When this happens, a frequency spread signal that spreads the frequency of the voice band is transmitted to the automatic alternate call circuit, and the audio signal is input from the external device microphone to the automatic alternate call circuit. The scattered signal and the audio signal are compared, a state signal is transmitted from the automatic alternating communication circuit to the external device CPU, and the first audio level input from the external device microphone is used to change the switching level based on the state signal. By changing the second electronic volume in order to make the audio level from the external device microphone adjusted by the first electronic volume the same as the predetermined audio level to the slave unit Intercom system that realizes automatic and alternate calls.

According to the first and second aspects of the invention, the call switching level can be adjusted to an appropriate level according to the installed environment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments to which an intercom system of the invention is applied will be described with reference to the drawings. FIG. 1 is a block diagram of an intercom system according to the present invention. The handset 1 is a call button 11 for a visitor to call a resident, a handset microphone 12 for a visitor to talk to a resident, a handset speaker 13, and a call signal for sending a call signal by operating the call button. The call circuit 14 is composed of a 2-wire 4-wire conversion circuit 15 and a bridge circuit 16 for connection to a parent device 2 to be described later.

The master unit 2 includes a power source circuit 21 for supplying power to each circuit, a master unit microphone 22 for a resident to talk to a visitor, a master unit speaker 23, and a slave unit for supplying power to the slave unit. Depending on the power supply circuit 24, the two-wire four-wire conversion circuit 25 for connection to the child device 1, the call detection circuit 26 for detecting the call signal transmitted from the child device 1, the ambient noise level and the installation location status The first and second electronic volumes 27 and 28 for performing appropriate call switching, the automatic alternating call circuit 29 for realizing hands-free calling, and the CPU 30 for controlling each circuit of the master unit 2 are configured. ing. The automatic alternate call circuit includes a signal level comparison circuit 291 for comparing the signal levels of transmission and reception, a transmission state switching unit 292, and a reception state switching unit 293.

The operation of the intercom system configured as described above will be described below. In a normal state, when a visitor operates the call button 11 of the handset 1, the call circuit 14 generates a call signal and calls the base unit 2 via the bridge circuit 16. When the detection signal is detected by the detection circuit 26, the CPU 30 reports a ringing tone from the main unit speaker 23 based on the calling signal, and the resident who has confirmed the ringing tone operates a response button (not shown). Since it is the same as that of the prior art that a communication path is formed between the parent device microphone 22 and the parent device speaker 23 of the parent device 2 and the child device microphone 12 and the child device speaker 13 of the child device 1, it is the same as in the prior art. In this section, we will explain in detail the operation to realize appropriate automatic alternate call without being affected by the surrounding noise level or installation location when making a hands-free call. To.

First, the base unit 2 is shifted to a call switching adjustment mode for performing appropriate call switching regardless of the ambient noise level and the installation location. The transition to the call switching adjustment mode is performed by operating an operation unit of the parent device 2 (not shown). In this state, base unit CPU 30 transmits frequency spread signal S1 obtained by spreading the frequency of the voice band to automatic alternating call circuit 29. At the same time, the resident inputs a voice from the main unit microphone 22 and transmits it to the automatic alternate call circuit 29 as a voice signal S2.

In the automatic alternating call circuit 14, the signal level comparison circuit 291 compares the levels of the frequency spread signal S1 and the voice signal S2. The signal level comparison circuit 291 transmits a status notification signal S3 to the parent CPU 30 as a comparison result between the frequency spread signal S1 and the audio signal S2. The master CPU 30 controls the first electronic volume 27 in order to change the sound level input from the master microphone 22 in order to change the switching level based on the state signal. Further, the second electronic volume 28 is controlled so that the audio level from the parent microphone 22 output from the changed first electronic volume 27 is the same as the audio level to the slave unit 1 set in advance.

Thereby, since the first electronic volume 27 and the second electronic volume 28 are changed to appropriate volumes, it is possible to realize an appropriate automatic alternate call regardless of the surrounding noise level or installation location. . When the volume adjustment is completed, base unit CPU 30 shifts from the call switching adjustment mode to the normal mode and enters a standby state.

Next, another embodiment will be described with reference to FIG. FIG. 2 is a block diagram of an intercom system showing another embodiment of the present invention. The same reference numerals are used for the same parts as in FIG. An external device connection circuit 30 is provided instead of the parent device microphone 22 and the parent device speaker 23, and the external device 3 is connected thereto. As in the first embodiment, the base unit 2 is shifted to the call switching adjustment mode, and voice is input from the external device 3 instead of the voice input from the base unit microphone 22. The operation after comparing the levels of the frequency spread signal S1 and the voice signal S2 by the signal level comparison circuit 291 of the automatic alternating communication circuit 14 is the same as that of the first embodiment. As a result, the same effect can be obtained even in a system configuration in which the system is connected to an external device via the parent device 2. Here, the main unit 2 may be an adapter connected to an external device, and the external device may be any device as long as it is a device such as a personal computer equipped with a microphone and a speaker.

It is a block diagram of the intercom system in the 1st example of the present invention. It is a block diagram of the intercom system in the 2nd example of the present invention.

1 ... handset 11 ... camera 12 ... call button 13 ... handset microphone 14 ... handset speaker 15 ... handset control unit 2 ... base unit 22 ... parent Microphone 23... Master speaker 27... First electronic volume 28... Second electronic volume 29... Automatic alternating call circuit 30.
3. External equipment

Claims (2)

It is composed of a slave unit for a visitor to call a resident and make a call, and a master unit for a resident who confirms the call from the slave unit to make a call with the visitor in response, The master unit is an intercom system having an automatic alternating communication circuit that compares the voice from the slave unit with the voice spoken by a resident and switches to a louder one, regardless of the ambient noise level or the installation location Transition to call switching adjustment mode for appropriate call switching, and when the main unit CPU of the base unit shifts to call switching adjustment mode, a frequency spread signal in which the frequency of the voice band is spread is transmitted to the automatic alternating call circuit Then, a voice signal is input from the base unit microphone to the automatic alternating communication circuit, the frequency spread signal and the voice signal are compared, and a status signal is transmitted from the automatic alternating communication circuit to the base unit CPU. In order to change the switching level based on the status signal, the audio level input from the parent microphone is changed by the first electronic volume, and the voice from the parent microphone adjusted by the first electronic volume is changed. An intercom system that realizes an appropriate automatic alternate call by changing the second electronic volume so that the voice level is the same as a predetermined voice level to the slave unit. A child device for a visitor to call a resident to make a call, an external device for a resident who has confirmed a call from the child device to make a call with the visitor, and the child device And an adapter installed between the external device and the adapter, and the adapter compares the voice from the slave unit with the voice spoken by the resident in the external device and switches the voice to a louder one. The intercom system has a transition to a call switching adjustment mode for performing appropriate call switching regardless of the ambient noise level and the installation location, and has shifted from the external device CPU of the external device to a call switching adjustment mode. When the automatic alternating call circuit transmits a frequency spread signal in which a frequency of a voice band is spread, an audio signal is input from an external device microphone to the automatic alternating call circuit, and the frequency The voice signal input from the external device microphone to change the level of switching based on the status signal by comparing the spread signal and the audio signal and transmitting the status signal from the automatic alternating communication circuit to the external device CPU In order to change the level with the first electronic volume and to make the audio level from the external device microphone adjusted with the first electronic volume the same as the predetermined audio level to the slave unit, the second electronic volume Intercom system that realizes appropriate automatic alternating calls by changing the volume.

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