JPH11196019A - Radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio equipment capable of can performing the transmission or reception of the same time via plural channels. SOLUTION: Input signal control parts 3 divides a receiving frequency band before and after a wide-band receiving part to cut the signal of a specific frequency band and to transmit the signals of other frequency bands respectively. The part 3 consist of (n) sets of individual input signal controllers 31 to 3n, where the band selection switches are connected in series to the band-pass filters. For (n) pieces of band-pass filters, each enter frequency and pass band are set at W1, W2... Wn to cover all frequency bonds W. The band selection switch connected to each band filter is turned on at all times. When a radio equipment performs transmission, a pressing switch 13 is pressed and also a control part 9 starts its control. thus, the band selection switch that is connected to the band-pass filter having relevant transmitting frequency in its pass-band is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio apparatus of a press-talk type, and more particularly to a radio apparatus capable of simultaneously communicating on a plurality of channels.

[0002]

2. Description of the Related Art Conventionally, a radio apparatus of the press-talk system has been widely used in business radio, amateur radio, low power radio, and the like. Machine. FIG. 3 is a schematic diagram showing an example of a conventional press-talk type wireless device. As shown in the figure, a wireless device is an antenna 10 for transmitting and receiving radio waves.
1. RF that removes out-of-band unwanted waves of transmission signal and reception signal
A filter 102, a transmission / reception switch 103 for switching the connection of the RF filter 102 between a receiving unit side and a transmitting unit side, amplifying a high frequency signal with low noise and converting it to an intermediate frequency signal,
A demodulated signal includes a receiving unit 104 that performs demodulation processing, a transmitting unit 105 that frequency-converts a modulated wave of a signal-processed audio signal into a high-frequency signal, amplifies power, and outputs the amplified signal to an antenna circuit, an audio amplifier, a CPU, and the like. Control unit 10 for amplifying the audio and audio signals or controlling the signals and the entire radio device
6. A microphone 107 for converting a sound into a sound signal, an operation display unit 108 for setting a transmission / reception frequency, a speaker 109 for converting a sound signal to a sound, and the transmission / reception switch 103 which is always connected to the reception unit 104 side. Transmission unit 10
It is composed of a press switch 110 which is switched to the 5 side to enable transmission.

[0003] When communication is performed by the wireless device having the above configuration, first, an arbitrary frequency is selected from a frequency range assigned by a radio communication method with a communication partner, and the frequency is set by the operation display unit 108. Do. When sending,
By pressing the press switch 110, the transmission / reception switch 103 is switched to the transmission unit 105 side to enable transmission. The telephone conversation is performed with the press switch 110 pressed, and the audio signal from the microphone 107 is amplified by the control unit 106, modulated by the transmission unit 105 and converted to a high-frequency signal, and transmitted and received by the transmission / reception switch 103 and the RF filter 102. And is output from the antenna 101 through. To end the transmission, the press of the press switch 110 is released. As a result, the connection of the transmission / reception switch 103 returns to the receiving unit 104 side, and the wireless device enters a receiving state. Further, the reception signal received by the antenna 101 passes through the RF filter 102 and the transmission / reception switch 103 and is received by the reception unit 104.
The signal is converted into an intermediate frequency signal by the receiving unit 104, demodulated, and output to the control unit 106. The demodulated signal is amplified in the control unit 106, and the
9 is output as audio.

[0004]

However, the conventional radio has the following problems. That is,
Since one radio can communicate only with one channel at a time, for example, when communicating with several groups of radios at a central control station or the like, the number of radios having the above configuration is equal to the number of channels to be used. It is necessary to set up a communication device or switch the frequency with one radio to communicate. However, if a plurality of wireless devices are installed, the configuration of the entire device becomes large, and the equipment cost becomes high. Also, 1
When communication is performed by switching the frequency between two wireless devices, communication cannot be performed simultaneously on a plurality of channels. SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the wireless device described above, and is a wireless device capable of simultaneously communicating on a plurality of channels with a single wireless device having a simple configuration. The purpose is to provide.

[0005]

In order to achieve the above object, according to the present invention, a digital signal processing means performs channel separation of a received broadband reception frequency signal and performs demodulation processing. A radio apparatus for modulating a signal to be transmitted to a desired channel by the digital signal processing means and transmitting the modulated signal, wherein a signal of a predetermined frequency band is cut off from the wideband reception frequency signal, And an input signal control means for supplying the digital signal processing means to the digital signal processing means. According to a second aspect of the present invention, the input signal control means is configured to block a frequency band corresponding to a transmission channel from a reception frequency signal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIG. 1 is a schematic diagram showing an embodiment of a press-talk type radio device according to the present invention. As shown in the figure, the wireless device includes an antenna 1 for transmitting and receiving radio waves, an RF filter 2 for removing unnecessary waves other than the frequency band of the communication system, a broadband receiving frequency band, and An input signal control unit 3 for blocking signals of other frequency bands and passing signals of other frequency bands, a wide band receiving unit 4 for amplifying a received high frequency signal in a wide band and converting it to an intermediate frequency signal, and an analog intermediate frequency signal in a wide band A / D converter 5 for digitizing, broadband transmitter 6 for converting a wideband modulated wave into a desired high-frequency signal and amplifying power, D for converting a wideband digital signal into an analog signal
A / A converter 7, a DSP (Digital Signal) for performing digital signal processing on signals of a transmission system and a reception system while keeping a wide band
A control unit 9 for converting the demodulated digital signal into an analog signal or an audio signal into a digital signal, and controlling the operation of each unit of the wireless device; a microphone 10 for converting audio into an electric signal; It comprises an operation display unit 11 for setting a frequency and the like, a speaker 12 for converting an audio signal into an audio signal, and a press switch 13 for setting a wireless device to a transmittable state.

The DSP 8 has a channel separation function for separating a plurality of reception channels into individual channels and a fast Fourier transform (FFT:
It has a FastFourier Transform function, and the transmission system has a waveform shaping function and a modulation processing function of an input signal. In the above-described waveform shaping and modulation operation, when the input signal is a plurality of channels, the signal of each channel is identified, the waveform is shaped, and modulation processing is performed on each channel. The operations in these DSPs are processed by software. As shown in FIG. 1, the input signal control unit 3 includes n sets of individual input signal controllers 31 to 3n. For example, the input signal controller 3n is configured as shown in FIG. It is composed of a band selection switch SWn and a band filter FLn. Thus, the input signal controllers 31 to 3n
Are each composed of a combination of a band selection switch and a band filter. The n band filters FL1 to FL1
FLn sets a center frequency and respective passbands to W1, W2,... Wn so as to cover the entire frequency band W of the system, as shown in FIG.

In the radio having the above configuration, each of the
Band selection connected to band filters FL1 to FLn
The switch is always ON, but the radio transmits
When pressing, press the press switch 13 at the same time
Under the control of the control unit 9, the transmission frequency is within the pass band.
The band selection switch connected to the band filter
When the signal is turned off, the transmission signal
The receiving unit 4 is prevented from being destroyed. For example, radio
Is transmitting at the frequency f1, the operation of the control unit 9 causes
Connected to a bandpass filter FL1 that includes f1 in its pass band.
The connected band selection switch SW1 is turned off, and the band W
The signal of 1 is cut off. At this time, the other band selection switch
Since switches SW2 to SWn remain ON, W2 to Wn
The received signal in the band of passes through the input signal control unit 3 and is
Output to the receiving unit 4. Receiving output from input signal control unit 3
The received signal is amplified in the wide band receiving section 4 while keeping the wide band.
Is converted to an intermediate frequency signal and input to the A / D converter 5.
It is. In the A / D converter 5, the intermediate frequency signal is
It is digitized as it is in a wide band.
Channel separation is performed and demodulation processing is performed. Restored by DSP8
The adjusted signal is converted into an analog signal by the controller 9 and then increased.
It is output as voice by the speaker 13 after being widened.
In the DSP 8, the input wideband digital
FFT processing of the received signal to reduce the frequency spectrum component
Analyze and monitor frequency usage in the above reception bands
I do.

The audio signal from the microphone 10 is converted into a digital signal by the control unit 9, subjected to waveform shaping by the DSP 8, and then subjected to a modulation process. The modulated intermediate frequency digital signal is analog-converted by a D / A converter 7, converted into a desired high-frequency signal by a broadband transmitter 6, output via a RF filter 2, and transmitted as a transmission radio wave via an antenna 1.

[0010] In the above-mentioned radio, when the audio signal is transmitted on a plurality of channels at the same time, the waveform shaping signal is modulated by a plurality of local oscillation frequencies by software of the DSP 8 to obtain a plurality of obtained modulation signals. The wave signal is analog-converted by the D / A converter 7. The analog signal is converted into a desired transmission frequency by the broadband transmitter 6, power-amplified, and transmitted from the antenna 1 via the RF filter 2. At this time, it goes without saying that the band selection switch connected to the band filter that covers the band corresponding to all of the plurality of channels used for transmission should be turned off. This enables broadcast communication, such as sending an emergency alert to all channels. When the audio signals from the plurality of microphones 10 are transmitted on different channels, the control unit 9 digitizes each audio signal, identifies each microphone output signal at the time of the waveform shaping operation in the DSP 8, and performs identification. In response to the signal, the signals can be transmitted on different channels by the same operation as described above. As a result, a wireless conference or the like between distant offices can be realized. Further, when a plurality of channels are simultaneously received, the intermediate frequency signals of the plurality of reception channels from the wideband receiving section 4 are directly used as A / D signals.
The data is digitized by the converter 5, separated into respective channels by software of the DSP 8, and demodulated for each channel. The demodulated signal of each channel can be converted into an analog signal by the control unit 9 and output as sound from a plurality of speakers 12 installed for each channel.

As described above, when a predetermined frequency band is cut off by the input signal control unit 3, the cutoff is performed by turning off a band selection switch combined with a band filter corresponding to the band. It is also possible to cut off by using a variable resistance attenuator instead of this band selection switch. That is, each of the n band selection switches is replaced with a variable resistance attenuator, the attenuation of the variable resistance attenuator is always set to 0, and the circuit is cut off. By configuring the variable resistance attenuator so as to set the degree of attenuation to sufficiently attenuate the input signal, it is possible to perform the same operation as that of the band selection switch.

[0012]

As described above, in order to perform communication using a plurality of channels, in the conventional system, communication is performed by switching the frequency with a single radio, or communication is performed by installing a radio for each channel. Compared with the prior art, the radio of the present invention is configured to receive or transmit a signal in a wide band, so that it is possible to simultaneously communicate with a plurality of channels with a single radio and with a simple configuration. It has a remarkable effect. Furthermore, the use of the frequency allocated to the communication system can be monitored by the FFT function, so that it is possible to select and use an optimal channel according to the surrounding conditions, and to always perform communication without interference. There is a big effect that.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an example of an embodiment of a wireless device according to the present invention.

2A is a circuit configuration diagram of an individual input signal controller of the input signal control unit of FIG. 1, and FIG. 2B is a diagram illustrating frequency characteristics of a bandpass filter group of the input signal control unit of FIG. .

FIG. 3 is a schematic configuration diagram illustrating an example of a conventional wireless device.

[Explanation of symbols]

(Radio equipment according to the present invention) 1. Antenna, 2. RF filter, 3.
Input signal control unit, 4 ··· Wide band receiving unit, 5 ··· A / D
Converter, 6 ··· broadband transmitter, 7 ··· D / A converter,
8. DSP, 9 control unit, 10 microphone, 11 operation display unit, 12 speaker
13. Press switches, 31 to 3n. Individual input signal controllers, FL1 to FLn .. Band filters constituting input signal controllers, Sn .. Band selection switches connected to band filters FLn. All frequency bands W1 to Wn... Each frequency band divided by n band filters (conventional radio equipment) 101... Antenna, 102... RF filter, 103... Input signal control unit, 104. , 105... Transmission unit, 106... Control unit, 1
07 · · · microphone · 108 · · · operation display unit, 109 · · · speaker, 110 · · · press switch

Claims (2)

[Claims] 1. A digital signal processing means for channel separation of a received broadband reception frequency signal and demodulation processing, and a signal to be transmitted is subjected to modulation processing for a desired channel by said digital signal processing means. A radio device for transmitting, comprising an input signal control unit for cutting off a signal of a predetermined frequency band from the broadband reception frequency signal and supplying a signal of another band to the digital signal processing unit. Features radio equipment. 2. The radio equipment according to claim 1, wherein said input signal control means is configured to cut off a frequency band corresponding to a transmission channel from a reception frequency signal.