JPH04107957U - Intercom device using electric light line carrier communication system - Google Patents

Abstract

(57) [Summary] [Purpose] In an intercom device using electric light line,
To accurately transmit ringing signals and response signals at the start of a call to prevent malfunctions. [Structure] An FM transmitting/receiving means 30 and a spread spectrum (SS) communication type transmitting/receiving means 40 are connected to the electric light line 27 via a coupling transformer T. The FM transmitting/receiving means 30 modulates and demodulates the telephone voice signal. SS communication type transmitting/receiving means 40
uses a frequency band other than the modulation frequency of the audio signal to perform SS modulation on a calling signal, etc., sends it to the electric light line 27, and demodulates the SS-modulated calling signal from the electric light line 27. A control circuit 37 connected to the FM transmitting/receiving means 30 and the SS communication type transmitting/receiving means 40 causes the SS communication type transmitting/receiving means 40 to transmit a calling signal at the start of a call, and also causes the FM transmitting/receiving means 30 to send a calling signal when a calling signal addressed to the self is received. Control the start.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an intercom system using electric light line carrier communication method that uses electric light line as a transmission path. For example, it is used to control the control device of electrical equipment connected to the electric light line. This intercom is an electric light line carrier communication system that can be used in home bus systems. Concerning improvements to equipment.

0002

[Conventional technology]

Currently, electric light lines are installed in most homes, and these are connected to intercom equipment. If used as an information transmission path, will there be a need to install a new information transmission path inside the house? It is not only economical but also easy to change connections and has excellent flexibility and expandability. There is. However, the electric light line is originally a power supply line that supplies power to electrical equipment; Noise generated from electrical equipment that has been damaged, a decrease in the line impedance of the electric light line itself, etc. For example, the influence on the transmitted signal due to It is under very poor conditions.

0003 Therefore, intercom devices that use electric light lines are equipped with audio signals for calls and Amplitude modulation (AM) is a method for modulating transmission signals such as control signals for starting a call. There are many frequency modulation (FM) methods that have better communication quality than conventional methods and can also transmit audio signals. It is used. Conventionally, as this type of electric light line carrier communication system intercom device, for example, The configuration shown in the figure is known. That is, the microphone 1 is connected to the FM modulation circuit 5 via the amplifier circuit 3, and the The FM modulation circuit is connected to the primary side T1 of the coupling transformer T whose secondary side T2 is connected to the electric light line 7. 5 is connected, and the FM demodulation circuit 9 is connected to the primary side T1 of the coupling transformer T, and the amplification A speaker 13 is connected to the FM demodulation circuit 9 via the circuit 11, and the speaker 13 is connected to the FM demodulation circuit 9 through the circuit 11. The output control signal and the response control signal are FM modulated by the FM modulation circuit 5 and sent to the electric light line 7. At the same time, the FM demodulation circuit also receives response control signals and call control signals from the other party. When FM demodulation is performed in 9, the amplifier circuits 3, 11, FM modulation circuit 5 and FM modulation circuit The configuration includes a control circuit 15 that controls the telephone 9 to be in a talking state.

0004 This intercom device sends a ring control signal to the other party at the beginning of a call. After receiving the call, the caller enters the call state by receiving a response control signal from the other party. When a call control signal is received from the other party, a response control signal is sent to the other party. control and enter the call state. In addition, the reference numeral 17 in Fig. 3 is used to input call operation instructions etc. of the intercom device itself. The reference numeral 19 is a display circuit.

[0005]

[Problem that the idea aims to solve]

However, the electric light line 7 is in a very poor environment as an information transmission line, and In some cases, line filters are installed on electrical equipment to suppress the noise generated. In many cases, this line filter and light line 7 create a line impedance for a specific frequency. – In extreme cases, the transmission signal is greatly attenuated and In some cases, the number of transmission signals is lost. Therefore, although the call quality may deteriorate, it is easy to secure a call, but it is difficult to initiate a call. Control signals such as the initial ring signal and response signal are not transmitted properly, and the other party is called. or the call may malfunction even though it is not being called. There was a problem.

[0006] Even under these circumstances, electric light line 7 has the advantages mentioned above, so it is difficult to abandon it. Therefore, it is desired to ensure accurate communication initiation on the electric light line 7. This invention was developed under these circumstances, and it An electric light line carrier communication method that ensures accurate communication and prevents malfunctions at the start of a call. The purpose is to provide intercom equipment.

[0007]

[Means to solve the problem] In order to solve these problems, the present invention has developed an FM transmitting/receiving means and spectrum expansion. It is configured to include a sending/receiving means and a control means using a scatter communication method. In other words, the FM transmitting/receiving means FM modulates the voice signal for telephone calls and directs it to the electric light line. It performs FM demodulation of the FM modulated signal transmitted over the electric light line. The transmitting/receiving means of the spectrum spread communication method uses frequencies other than the FM modulation frequency of the audio signal. Spread spectrum modulation of control signals for telephone calls using wavenumber bands and directing them to the light line control signal from the spread spectrum modulated signal transmitted over the electric light line. It demodulates the signal.

[0008] The control means outputs a paging control signal to the transmission/reception means of the spread spectrum communication system. The self-addressed response control signal transmitted on the light line in response to the paging control signal is It is demodulated by the transmitting/receiving means of the tram spread communication method, or the self-addressed call control signal is streamed. When demodulating using the transmitting/receiving means of the spread spectrum communication method, a response control signal is sent under prescribed instructions. The signal is modulated and output using a spread spectrum communication transmitting/receiving means, and the call is ready. When this happens, the FM transmitter/receiver is controlled to start a call.

[0009] Furthermore, the present invention has a display means, and the control means is connected to an electric light line. through transmission and reception means of spread spectrum communication method to the control device of electrical equipment. In addition to controlling the sending of operation control signals, monitor signals from the control device are When received via a transmitting/receiving means of tractram diffusion communication method, it is displayed on the display means. It is also possible to configure the display to be controlled.

0010

[Effect]

In the present invention equipped with such a means, the control means transmits the paging control signal into a spectrum. When the signal is output to a transmitting/receiving means using the spectrum spread communication method, it is modulated by spectrum spread and sent to the electric light line. self-addressed responses transmitted down the light wire in response to the call control signal while When the control signal is demodulated by the spread spectrum communication method transmitting/receiving means, the call starts state. is in place, and the self-directed paging control signal is sent and received using the spread spectrum communication method. Once demodulated, the control means sends a response control signal under predetermined instructions to spread spectrum communication. When the output is sent to the transmitting/receiving means of the system, the call start state is established, and in either case, the control means controls the FM transmitting/receiving means to start a call, and the FM transmitting/receiving means becomes ready for talking. Ru. It also has a display means, and the control means allows the control device to control other electrical equipment. In a configuration in which the spread spectrum modulated monitor signal is displayed and controlled by the display means, A spread spectrum modulated monitor signal is displayed.

[0011]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows an embodiment of the electric light line carrier communication type intercom device according to the present invention. FIG. A telephone microphone 21 is connected to an FM modulation circuit 25 via an amplifier circuit 23. The FM modulation circuit 25 converts the audio signal from the microphone 21 into a FM carrier of any of the 6 carrier wave frequencies for calls (6 channels) in Figure 2 Selective FM modulation is performed by transmitting waves, and the secondary side T2 is connected to the electric light line 27. It is connected to the primary side T1 of the coupling transformer T. The primary side T1 of the coupling transformer T receives the FM modulated signal from the electric light line 27. An FM demodulation circuit 29 is connected to the FM demodulation circuit 29 for FM demodulating the signal. The camera 33 is connected.

0012 These microphones 21, amplifier circuits 23, 31, FM modulation circuit 25, The FM demodulation circuit 29 and the speaker 33 are conventionally known, and these An FM transmitting/receiving means 30 for telephone calls is formed, but the main body of the FM transmitting/receiving means 30 is FM modulation circuit 25 and FM demodulation circuit 29. A spread spectrum modulation circuit (abbreviated as SS modulation circuit) 35 is connected to a control circuit 37. A call control signal, a response control signal, etc., which will be described later, are transmitted at a frequency different from the FM carrier wave described above. Spectrum is transmitted using several bands, for example, a frequency band lower than the FM carrier as shown in Figure 2. It performs tram spread modulation and is connected to the primary side T1 of the coupling transformer T.

[0013] A spread spectrum demodulation circuit (SS demodulation circuit) connected to the primary side T1 of the coupling transformer T. 39 is a call circuit that transmits the light line 27 through spread spectrum modulation. Control signals, response control signals, etc. are spread spectrum demodulated, and the demodulated signals are sent to the control circuit. 37. The SS modulation circuit 35 outputs a paging control signal and a response control signal in binary signal data format. Spread in a wide right-handed number band using an N (pseudo-noise) code, i.e., the spectrum It performs spread modulation, and the SS demodulation circuit 39 converts the PN code used for modulation on the transmitting side. Calling the data format by despreading the signal using spread spectrum modulation The SS modulation circuit 35 and the SS modulation circuit 35 obtain control signals and response control signals. A transmitting/receiving means 40 of the spread spectrum communication system is formed mainly by the S demodulating circuit 39. has been done.

[0014] The control circuit 37 becomes the other party when a call start instruction is input from the operation circuit 41. A call control signal corresponding to the intercom device 43 is output to the SS modulation circuit 35. SS controls this and is a response control signal from the other party's intercom device 43. The demodulation circuit 39 inputs the spread spectrum modulated signal and prepares the call start state. When this occurs, the FM transmitting/receiving means 30 for telephone calls is controlled to start operating. The control circuit 37 also receives a modulated call from the intercom device 43 that is the other party. When the control signal is demodulated by the SS demodulation circuit 39, a call is started from the operation circuit 41. The response control signal is modulated by the SS modulation circuit 35 according to the response instruction input, and transmission is controlled. At the same time, it controls the start of operation of the FM transmitting/receiving means 30 for telephone calls.

[0015] Therefore, the FM transmitting/receiving means 30 is operated by the control circuit 37 except in the call starting state. It is out of operation. Furthermore, the control circuit 37 includes control devices 4 for other electrical devices connected to the electric light line 27. 5, an operation control signal for controlling the operation is outputted to the SS modulation circuit 35. At the same time, the spread spectrum modulated monitor from the control device 45 of the electrical equipment When the target signal is demodulated by the SS demodulation circuit 39, the display circuit 47 controls the display. It is. In this way, the control circuit 37 uses the FM transmitting/receiving means 30 and the spread spectrum communication method. The transmitting/receiving means 40, and furthermore, the control means for the operation circuit 41 and display circuit 47. .

[0016] Next, we will briefly explain the operation of the electric light line carrier communication system intercom device according to the present invention. I will clarify. First, when a call start instruction is input from the operation circuit 41 to the control circuit 37, the control circuit The line 37 sends a call control signal corresponding to the intercom device 43 to be called to the SS. It is output to the modulation circuit 35, is spread spectrum modulated, and is transmitted through the coupling transformer T. It is sent to the light line 27.

[0017] The other party's intercom device 4 receives the modulated call control signal (SS signal) When the modulation response control signal from 3 is sent to the electric light line 27, the SS demodulation circuit 39 The control circuit 37 detects that the call start condition is ready, and the FM transmitting/receiving circuit 30 to start the operation and enter the call start state. After that, communication is carried out using the FM modulation method. The story is maintained. If a modulation response control signal is sent from the other party's intercom device 43 to the electric light line 27, If it is not output, the control circuit 37 will not detect the response control signal, so the FM transmitting/receiving circuit 3 0 is not controlled to start the operation and does not enter the call start state.

[0018] In addition, a modulated call control signal is sent from the intercom device 43 that is the other party. When the signal is demodulated by the SS demodulation circuit 39, the control circuit 37 receives a response from the operation circuit 41. Based on the start instruction input, a response control signal is output to the SS modulation circuit 35, and the communication It is detected that the talk start condition is set, and the FM transmitting/receiving circuit 30 is controlled to start operating. Furthermore, the spread spectrum modulated monitor signal from the control device 45 of other electrical equipment is When the target signal is demodulated by the SS demodulation circuit 39, the control circuit 37 monitors it. - signal is displayed on the display circuit 47.

[0019] In this way, the electric light line carrier communication system intercom device of the present invention has a wide range of frequencies. It is transmitted spread across the band, so there is less chance of missing signals at specific frequencies, and Spectrum has the advantage of being less affected by constant frequency noise. Call control signals and corresponding signals between intercom devices are provided using the system spread communication method. Since the response control signal is transmitted, a line filter is built into the electric light line 27. Line impedance may become extremely high at a particular frequency due to equipment being installed. Even if the signal drops, the control signal is transmitted normally without being affected by it, and the call can be opened. The starting operation is ensured, and the calling malfunctions even though no calling is performed. Such a situation is unlikely to occur.

[0020] Ordinary calls are made using the FM modulation method, and the carrier frequency is SS Since it is separated from the signal, the same call quality as before can be maintained. Furthermore, the spread spectrum modulated monitor signal from the control device 45 of other electrical equipment is Since it outputs a signal, it is possible to control the control device 45 of other electrical equipment. Spectrum spread modulated monitor signal from the control device 45 of other electrical equipment The number can be displayed accurately.

[0021]

[Effect of the idea]

As explained above, the present invention provides call control signals and response control signals between intercom devices. In addition to transmitting control signals such as control signals using the spread spectrum communication method, Since the configuration transmits voice signals for calls using the conventional FM communication method, it is easy to start a call. Even if the control signal is attenuated by the electric light line at the beginning, the control signal is reliably transmitted, ensuring reliable It ensures the start of a call, prevents call malfunctions, and is compatible with normal call products. The quality can be maintained to some extent. It has a display means, and is connected to a control device of other electrical equipment by means of a control means. In configurations in which control signals are transmitted using spread spectrum communication, remote control and can be monitored and monitored.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an intercom device using an electric light line carrier communication method according to the present invention.

FIG. 2 is a diagram showing an example of frequency allocation in the electric light line carrier communication system.

FIG. 3 is a block diagram showing a conventional electric light line carrier communication type intercom device.

[Explanation of symbols]

1, 21 Microphone 3, 11, 23, 31 Amplifier circuit 5, 25 FM modulation circuit 7, 27 Electric light line 9, 29 FM demodulation circuit 13, 33 Speaker 15, 37 Control means (control circuit) 17, 41 Operation circuit 19, 47 Display circuit (display means) 30 FM transmitting/receiving means 35 SS modulation circuit 39 SS demodulation circuit 40 Spread spectrum communication method transmitting and receiving means 43 Intercom device 45 Control devices for other electrical equipment

Claims (2)

[Scope of utility model registration request] 1. FM transmitting/receiving means for FM modulating an audio signal for a telephone call, transmitting the FM modulated signal to an electric light line, and demodulating the FM modulated signal transmitted via the electric light line, and a frequency band other than the modulation frequency of the audio signal. a transmitting/receiving means of a spread spectrum communication system that spread spectrum modulates a control signal for a telephone call using a spread spectrum modulation signal and sends it to the electric light line, and demodulates a spread spectrum modulated signal transmitted via the electric light line, and the spread spectrum communication When the control signal is output to the transmitting/receiving means of the spread spectrum communication method and the self-addressed control signal transmitted from the other party is demodulated by the transmitting/receiving means of the spread spectrum communication method and the call start condition is set, the F.
1. An intercom device using an electric light line carrier communication system, comprising: a control means for controlling the start of a call by a transmitting/receiving means. 2. The control means includes a display means, and the control means controls the transmission of an operation control signal to a control device of another electrical device connected to the electric light line via the transmission/reception means of the spread spectrum communication system. 2. The electric light line carrier communication intercom device according to claim 1, wherein said display means displays a monitor signal from said control device demodulated by said spread spectrum communication transmitting/receiving means.