JPH08116564A - Radio equipment - Google Patents

Abstract

PURPOSE: To receive two selective calling codes or over through a single channel by identifying either code among two selective calling codes or over through the single channel and providing an output of a voice signal from a voice signal path only when the identified code is coincident with a set code. CONSTITUTION: An output signal of a mixer 3 in a reception section of the radio equipment is given to an intermediate frequency circuit 4, in which the signal is converted into an intermediate frequency signal, a demodulator 8 demodulates a voice signal and a selective calling code and an LPF 9 and an HPF 10 divide the demodulated signal into the voice signal and the selective calling code. The selective calling code from the LPF 9 is given to a plural selective calling code identification circuit 16 identifying two selective calling codes or over through a single channel, in which the codes are coincident with any code set as channel data 15 resulting from setting two selective calling codes or over through the single channel in advance. As the result of identification, a mute circuit 12 is operated only when they are coincident and the voice signal passing through the HPF 10 is outputted from a speaker 14 via a voice frequency amplifier 13 and received through the single channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device.

[0002]

2. Description of the Related Art An example of a conventional radio device will be described below with reference to FIG. In the receiving section of the wireless device shown in FIG. 2, the input signal from the antenna 1 passes through the high frequency filter 2,
It is given to one input of the mixer 3. To the other input of this mixer 3, the output signal of the synthesizer 5 which operates by the single selection call code setting channel data 6 having channel data is added. The output signal of the mixer 3 is input to the intermediate frequency circuit 4 and an intermediate frequency signal is obtained. The intermediate frequency signal is demodulated by the demodulator 8 into a voice signal and a selective call code, and divided into a voice signal and a selective call code by the LPF 9 and the HPF 10.

The selective call code extracted by the LPF 9 is a singular number in which one selective call code is set in advance for each channel by a singular selective call code identifying circuit 11 which can identify only one selective call code for each channel. It is identified whether the code matches the code set in the selective call code setting channel data 6. As a result of this identification, the mute circuit 12 that controls the opening and closing of the audio signal path operates only when they match, and the audio signal that has passed through the HPF 10 is
It is output from the speaker 14 via the audio frequency amplifier 13. Further, when receiving with two or more selective call codes at the same frequency, the selective call codes are set in each channel and each channel is constantly scanned to check the selective call codes.

[0004]

In the above-mentioned conventional technique, when receiving with two or more selective call codes at the same frequency, it is necessary to scan with two or more channels. Since it is necessary to have a circuit for scanning a channel in a manner in which one or more channels can be set, the circuit becomes complicated, and it takes time to scan when there are many channels. As described above, in the above-mentioned conventional technique, when receiving with two or more selective call codes having the same reception frequency but different ones, it is necessary to perform time-consuming scanning on two or more channels to receive. It is an object of the present invention to eliminate these drawbacks and to provide a radio capable of receiving more than one selective call code on a single channel.

[0005]

According to the present invention, in order to achieve the above object, two or more selective call codes are set in advance in the selective call code setting channel data in a single channel, and a selective call code identification circuit is provided. It is possible to identify two or more selective call codes in a single channel.

[0006]

As a result, it is possible to realize a radio device capable of receiving two or more selective call codes in a single channel.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 15 is a multi-select call code setting channel data, and 16 is a multi-select call code identifying circuit. Further, the respective units 1 to 5, 8 to 10 and 12 to 14 are the same as the conventional wireless device shown in FIG. In the receiver of the wireless device shown in FIG. 1, an input signal from the antenna 1 passes through the high frequency filter 2 and is given to one input of the mixer 3. To the other input of the mixer 3, the output signal of the synthesizer 5 which operates by the multiple selection call code setting channel data 15 having channel data is added. The output signal of the mixer 3 is input to the intermediate frequency circuit 4 and an intermediate frequency signal is obtained. The intermediate frequency signal is demodulated by the demodulator 8 into a voice signal and a selective call code, and divided into a voice signal and a selective call code by the LPF 9 and the HPF 10.

The selective call code extracted by the LPF 9 is detected by the multiple selective call code identifying circuit 16 which identifies two or more selective call codes in a single channel.
Multiple selection call code setting channel data 1 in which two or more multiple selection call codes are set in advance in a single channel
It is identified whether or not it matches with any of the codes set to 5. As a result of this identification, the mute circuit 12 that controls the opening and closing of the audio signal path operates only when they match, and the audio signal that has passed through the HPF 10 is output from the speaker 14 via the audio frequency amplifier 13.

[0009]

According to the present invention, when receiving with two or more selective call codes at the same frequency, it is possible to receive with a single channel without scanning two or more channels. Machine is realized and its effect is remarkable. Further, since the means of the present invention is extremely simple,
It is economical and has a wide range of applications.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional wireless device.

[Explanation of symbols]

 1 Antenna 2 High Frequency Filter 3 Mixer 4 Intermediate Frequency Circuit 5 Synthesizer 6 Single Selection Call Code Setting Channel Data 7 Channel Switching Circuit 8 Demodulator 9 LPF 10 HPF 11 Single Selection Call Code Identification Circuit 12 Mute Circuit 13 Audio Frequency Amplifier 14 Speaker 15 Multiple Selective call code setting channel data 16 Multiple selection call code identification circuit

Claims (1)

[Claims] 1. A wireless device having a receiving section that has an identifying means for identifying a selective call code from a received signal and a means for controlling the output of a voice signal received according to the identification result. A setting means for setting a plurality of selective call codes and an identifying means for identifying the set plurality of selective call codes from a received signal are provided, and at least one selective call code among the plurality of selective call codes is identified. A radio device, which is configured to output a received audio signal when the radio signal is received.