JPH0697909A - Spread spectrum communication equipment - Google Patents

Abstract

PURPOSE:To miniaturize a connecting device and to reduce the cost, in the spectrum radio communication equipment provided with a controller, plural slave machines and plural connecting devices. CONSTITUTION:In plural connecting devices 12, a frequency converting part 13 is provided, a wide band transmission line 14 for allowing the high frequency of an optical fiber, etc., to pass through is used as a wire transmission line, and in a controller 15, an SS modulating part 3 and an SS demodulating part 4 of the same number as plural slave machines are provided. In such a manner, since the simultaneous communication of plural slave machines can be subjected to centralized processing by one set of controller 15, the connecting device can be miniaturized and the cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spread spectrum communication device having a control device, a plurality of slave units, and a plurality of connection devices.

[0002]

2. Description of the Related Art In recent years, spread spectrum communication devices have been used not only for military communication but also for public communication and personal communication because they use a communication method that is excellent in multiple access, confidentiality and interference resistance. It started to come.

A conventional spread spectrum communication device will be described below with reference to the drawings.

FIG. 2 is a block diagram showing the structure of a conventional spread spectrum communication apparatus. In FIG. 2, 1 is a slave unit, 2 is a slave unit antenna, and 3 is a spread spectrum (SS) for spread spectrum modulating a voice signal. ) Modulator, 4
Is a spread spectrum (SS) demodulation unit for obtaining a voice signal by spread spectrum demodulation, 5 is a connection device, 6 is a connection device antenna, 8 is a control device, 7 is a voice signal between the control device 8 and the connection device 5. Is a wire transmission line for transmitting the signal, 9 is a control unit for switching control so as to transmit and receive voice signals to and from the plurality of connection devices 5 and the telephone 11, and 10 is a line connecting the telephone 11 and the control device 8.

The operation of the conventional spread spectrum communication device configured as described above will be described below. First, the slave unit 1 spread-spectrum-modulates an audio signal input by a microphone or the like by the SS modulator 3, converts the voice signal into a radio frequency band by the slave unit antenna 2, and transmits a radio wave.
The connection device 5 receives the radio wave from the cordless handset 1 by the connection device antenna 6, then converts it to the frequency band modulated by the SS modulator 3 of the cordless handset 1, performs spread spectrum demodulation by the SS demodulator 4, and outputs a voice signal. Is output to the control device 8 via a wired transmission path 7 capable of transmitting. In the control device 8, the control unit 9 switches to the wired transmission path 7 connected to the connection device 5 capable of communicating with another slave device 1 specified when transmitting the slave device in response to the audio signal input from the connection device 5. Output. Alternatively, when the telephone 11 connected by wire is designated at the time of transmitting the cordless handset, the voice signal is switched to the line 10 and output.

Next, in the connection device 5 to which the audio signal from the control device 8 is input via the wired transmission line 7, the audio signal is spread-spectrum-modulated by the SS modulator 3 as in the case of the slave unit 1. , The connection device antenna 6 converts to a radio frequency band and transmits a radio wave. The designated slave 1 receives the radio wave from the connection device 5 by the slave antenna 2, then converts the frequency band in the same manner as when the connection device receives the signal, and performs the spread spectrum demodulation by the SS demodulator 4. It demodulates to an audio signal and outputs it to a speaker or the like. With the above operation, voice communication between a plurality of slaves 1 or between a slave 1 and the telephone 11 becomes possible.

Here, since the reaching distance of the radio wave transmitted and received by the handset 1 and the connecting device 5 is usually within a range of 100 m to 300 m, the connecting device 5 is connected to the handset 1 which is carried by a person. Is installed on the ceiling or wall of the building at intervals of about 100 m, expanding the voice communication range of the handset. In addition, the SS modulator 3 and the SS demodulator 4 in the connection device 5 are
Although it is not shown in FIG. 2 in a system that enables simultaneous communication with a plurality of slave units because a group can communicate with one slave unit, a plurality of sets of SS modulators 3 are provided in the connection device 5. The SS demodulation unit 4 and the wired transmission line 7 are required.

[0008]

However, in the above-described conventional spread spectrum communication device, as described above, one set of the SS modulation section and the SS demodulation section in the connection device is required for each slave unit, and the same unit is used. In order to simultaneously communicate with a plurality of cordless handsets by using the connection device of No. 3, it is necessary to prepare a plurality of SS modulation units and SS demodulation units in the connection device. An SS modulation section, an SS demodulation section and a wired transmission line are required.

That is, when N slave units try to communicate by using M connection devices, N sets of SS modulation units and SS demodulation units are required for each connection device, and the SS system as a whole is required.
Since N × M sets of the modulation unit and the SS demodulation unit are required, there is a problem that the connection device installed on the ceiling or wall of the building is large and the cost of the spread spectrum communication device is high.

An object of the present invention is to solve the above problems and to provide a low cost spread spectrum communication device in which the circuit scale of the connection device is small.

[0011]

In order to achieve the above-mentioned object, the present invention controls the frequency through a transmission / reception with a slave unit and a wired transmission line instead of an SS modulation unit and an SS demodulation unit in a connection device. A frequency conversion unit for performing frequency conversion between the device and a frequency for transmission / reception is provided, a broadband transmission line that allows passage to high frequencies such as optical fibers is used as a wired transmission line, and an SS modulation unit and an SS demodulation unit are provided in the control device. It is provided.

[0012]

According to the present invention, with the above-described configuration, simultaneous communication with a plurality of slave units is possible only by providing a frequency conversion unit in each connection device, and the same number of SS modulator units and SS demodulator units as the slave units that perform simultaneous communication. Since it suffices to prepare only one control device, it is possible to realize a small connection device and cost reduction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the spread spectrum communication apparatus of the present embodiment. In FIG. 1, 12 is a connection device, 13 is a frequency conversion unit, and 14 is between the connection device 12 and the control device 15. It is a wideband transmission line for communicating the high frequency spread spectrum signal of, for example, a line such as an optical fiber. Reference numeral 16 denotes a control unit of the control device 15 that controls switching so as to transmit and receive voice signals to and from the plurality of connection devices 12 and the telephone set 11. In addition, the same reference numerals are given to the blocks having the same functions as those in FIG. 2, and the description thereof is omitted.

The operation of the spread spectrum communication device configured as described above will be described below. Cordless handset 1
Is the same as the conventional example, the audio signal input by the microphone is S
After the spread spectrum modulation is performed by the S modulator 3, the slave antenna 2 converts the spectrum into a radio frequency band and transmits a radio wave. After the connection device 12 receives the radio wave from the cordless handset 1 at the connection device antenna 6, the frequency conversion unit 13 converts the radio wave into a predetermined frequency band lower than the radio frequency band, and the wide band transmission line.
It outputs to the control device 15 via 14. The signal on the wide band transmission line is a wide band high frequency signal subjected to spread spectrum modulation, but wide band high frequency transmission is possible by providing an optical fiber or the like.

Next, in the controller 15, the spread spectrum signal input from the wide band transmission line 14 is spread spectrum demodulated by the SS demodulation section 4 to be a voice signal. The control unit 16 controls the demodulated voice signal to perform spread spectrum modulation with the spread code of another slave unit 1 designated at the time of transmitting the slave unit, and switches to the SS modulator 3 for output. Alternatively, when the telephone 11 connected by wire is designated at the time of transmitting the cordless handset, the voice signal is switched to the line 10 and output. SS
The modulator 3 spread-spectrum modulates the input voice signal with the designated spread code. For the spread spectrum signal that has been spread spectrum modulated, the control unit 16
When the slave unit is transmitted, the output is switched to the broadband transmission line 14 connected to the connection device 12 capable of communicating with another slave unit 1 specified.

Next, in the connection device 12, the spread spectrum signal input from the wide band transmission line 14 is frequency-converted into a radio frequency band by the frequency conversion unit 13, and is wirelessly transmitted via the connection device antenna 6. The designated slave unit 1 operates in exactly the same manner as the conventional example, and after the radio wave from the connection device 12 is received by the slave unit antenna 2, the SS demodulation unit 4 performs spread spectrum demodulation and demodulates it into a voice signal. Output to a speaker. With the above operation, voice communication between the plurality of slaves 1 or between the slave 1 and the telephone 11 becomes possible.

The frequency conversion unit 13 in the connection device 12 is set to 1
It is possible to simultaneously communicate with a plurality of slaves on a stand, and if the same number of SS modulators 3 and SS demodulators 4 as the slaves are provided in the control device 15, simultaneous communication with a plurality of slaves becomes possible.

[0019]

As described above, in the spread spectrum communication device of the present invention, it is possible to simultaneously communicate with a plurality of slave units by providing only one frequency conversion unit in each connecting device, and N slave units can be used. Spread communication device that realizes downsizing of the control device and cost reduction, because only N sets of SS modulation units and SS demodulation units need to be provided in one control device for simultaneous communication with the device. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a spread spectrum communication device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional spread spectrum communication device.

[Explanation of symbols]

1 ... cordless handset, 2 ... cordless handset antenna, 3 ... SS modulator,
4 ... SS demodulation unit, 5, 12 ... Connection device, 6 ... Connection device antenna, 7 ... Wired transmission line, 8, 15 ... Control device,
9, 16 ... Control unit, 10 ... Line, 11 ... Telephone, 13 ... Frequency conversion unit, 14 ... Wideband transmission line.

Claims (1)

[Claims] 1. A cordless handset for transmitting and receiving radio signals using a spread spectrum communication method, a connection device capable of radio communication with the cordless handset, and a broadband transmission line for transmitting a broadband frequency.
A control device connected to the broadband transmission path; an SS modulation unit and an SS demodulation unit in the slave unit for performing spread spectrum modulation and demodulation; and a frequency in the connection device for transmitting and receiving with the slave unit. A frequency conversion unit that performs frequency conversion between a frequency for transmitting and receiving with a control device via the wideband transmission path; an SS modulation unit and an SS demodulation unit that are in the control device and perform spread spectrum modulation and demodulation; A spread spectrum modulation and demodulation in which a signal input from the SS demodulation unit is switched to be output to the SS modulation unit, and the spread spectrum modulation / demodulation is intensively performed in the control device via a wide band transmission line. Communication device.