JP3004362U - Wireless communication device - Google Patents

Abstract

(57) [Summary] [Purpose] Sharing most of the receiving units for each band,
The purpose is to receive radio waves of multiple bands and change the frequency. [Configuration] Data for frequency conversion corresponding to various bands is switched by a band selection switch, or is input from a CPU to a local oscillation unit in a time-sharing manner and input to the mixer, so that the mixer or the IF and thereafter is input. The shared receiving unit can receive a plurality of bands having different frequency bands, and can set frequencies according to various bands.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wireless communication device capable of receiving a plurality of bands.

[0002]

[Prior art]

 Conventionally, a wireless communication device capable of receiving a plurality of bands needs as many receiving units as the number of bands, and for example, as shown in FIG. 5, in a wireless communication device receiving a VHF band and a UHF band, a local oscillator 59 is required. Data is sent from the CPU 58 in the wireless communication device to the PLL circuit 57, and after changing the frequency division ratio of the frequency divider in the PLL circuit 57, the oscillation frequency output is input from the VCO to the mixer and the high frequency output is converted to the intermediate frequency. In this case, one reference oscillator 56 is used and a plurality of receiving circuits are used while being shared by other receiving bands.

[0003]

[Problems to be solved by the device]

 However, in such a conventional one, it is necessary to prepare as many receivers as the number of bands, and when producing a wireless communication device capable of receiving a plurality of bands, the number of parts is large, The problem is that it is expensive. In order to solve these problems, the present invention changes the frequency corresponding to each band by changing the frequency corresponding to each band by using one mixer or a receiving unit after the IF, and localizing the data from the CPU. It is an object to provide a wireless communication device that sends to the oscillating unit and changes various frequencies in the frequency band with a mixer.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention inputs the data for frequency conversion corresponding to each band from the CPU to the local oscillator and inputs the frequency signal from the VCO to the mixer. Since the frequency of each band can be received, the data from the CPU is input to the PLL circuit, the frequency division ratio according to each band is changed and set, and the data for changing the band is sent from the CPU. It is supported by sending to the local oscillator in time division.

[0005]

[Action]

 When the various band selection keys of the wireless communication device are operated or the reception status of the wireless device is set to the simultaneous reception mode for multiple bands, data for each band is sent from the CPU to the local oscillator, or time division is performed. When the data of various bands are transmitted and the oscillation frequency is input to the mixer, the high frequency is converted into the intermediate frequency corresponding to each band.

[0006]

【Example】

As shown in FIG. 1, the outline of the present invention is that a received signal frequency fr induced in an antenna 20 is amplified by high frequency amplifiers (RF) 11 and (RF) 11 'and given to a mixer (MIX) 12. Here, it is mixed with the oscillation frequency fo of the local oscillator 13 controlled by the CPU 14, and the output of the mixer (MIX) 12 has a frequency component fi = fr + fo of the sum of fr and fo and a frequency component of the difference. An output of fi = fr-fo is obtained. The output (intermediate frequency) obtained by this frequency conversion is input to the intermediate frequency amplification unit (IF) 15, and further, a mixer (MIX) 16 is provided in the subsequent stage to output the output of the beat oscillator (BFO) 17. Is input, the signal is dropped to a low frequency, amplified by the low frequency amplifier (AF) 18, and transmitted as an audible sound from the speaker 19.

The local oscillator 13 is mainly composed of a PLL circuit, and the CPU 14 sends data corresponding to various bands to the PLL circuit 21 to enable reception of various bands. It is a thing. Also, by sending data of various bands to the local oscillator 13 in a time division manner from this CPU, it becomes possible to receive a plurality of different radio waves in a pseudo manner at the same time. Further, as shown in FIG. 2, the present invention can be carried out by receiving the respective oscillation frequencies from the local oscillator 13 'to the mixer (MIX) 12' of each band.

FIG. 3 is an example of a flow chart showing the operation of the CPU when the local oscillator 13 of the present invention shown in FIG. 1 is controlled and the band is selected by the band selection switch. (For a wireless communication device using VHF or UHF) When the power is turned on in step 31, the band selection switch selects UHF or VHF in step 32, and VHF is selected in step 33. Then, the frequency data to be changed is sent from the CPU 14 to the input terminal of the PLL programmable divider or the PLLIC of the local oscillator 13. Thereafter, in step 35, the frequency in the display portion on the panel surface is changed, and in step 36, the LCD lamp for band identification of VHF and UHF on the panel surface is turned on.

FIG. 4 is an example of a flowchart (VHF) showing the operation of the CPU when controlling the local oscillator 13 ′ of the present invention shown in FIG. 2 and changing the reception band in a time division manner. , UHF radio communication equipment), but in step 41, identify whether the band switch is VHF or UHF, and if it is VHF, change the frequency value in step 42. Determine if When the frequency is changed, the data is sent to the local oscillator in step 43, the frequency is displayed on the display in step 44, and the identification lamp is turned on in step 45. If the frequency is not changed, or after changing the frequency, if it is determined in step 46 that Asec or more (A is an arbitrary value) has elapsed, the CPU time division processing causes the UHF band to be changed in step 47. Is checked, and if Asec has not yet elapsed, the process returns to step 42 and it is determined whether or not the frequency should be changed. In step 48, the power is turned off and the operation of the wireless communication device is stopped, or it is determined whether or not the wireless communication device continues to operate. However, when continuing the operation, move to step 49 and move to the UHF band. Transition to frequency change operation. When changing the frequency, the CPU sends data for changing the frequency to the local oscillator in step 50, changes the frequency of the display in step 51, and displays the identification lamp in step 52. When it is determined in step 53 that the reception of the UHF band has continued for Asec or more, this time, the VHF band is watched in step 54, and the time division processing of VHF and UHF is repeated unless the power is turned off in step 55.

[0011]

[Effect of device]

 Since the present invention can receive radio waves in a plurality of frequency bands by a mixer or a receiving circuit sharing an IF and thereafter, it is possible to reduce the size and weight of the radio and further increase the function of the radio. it can. Then, since each band is watched by the band selection switch or time division, the frequency display of each band appears on the display immediately, you can easily understand the band currently used, and actually Is receiving a single band, but can create a state where it is receiving multiple bands at the same time, which is extremely effective in operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of the present invention when one mixer is used.

FIG. 2 is a block diagram showing an outline of the present invention when two mixers are used.

FIG. 3 is a flow chart showing the operation of a CPU controlling a local oscillator of the present invention.

FIG. 4 is a CPU for controlling the local oscillator of the present invention in a time division manner.
The flowchart which showed operation | movement.

FIG. 5 is a block diagram showing a configuration of a receiver of a conventional wireless communication device capable of receiving a plurality of bands.

[Explanation of symbols]

 11 high frequency amplifier 11 'high frequency amplifier 12 mixer 12' mixer 13 local oscillator 13 'local oscillator 14 CPU 15 intermediate frequency amplifier

Claims (2)

[Scope of utility model registration request] 1. A radio communication device having a receiving circuit for receiving a plurality of bands, wherein a mixer or a reception unit after an IF is shared, and a C is provided in the radio communication device.
A radio communication device, wherein data for converting frequencies of various plural bands is transmitted from a PU to a local oscillating unit, and plural bands can be received by operating a band selection switch. 2. In a wireless communication device having a receiving circuit for receiving a plurality of bands, a CP provided in the wireless communication device, sharing a mixer or a receiving part after the IF.
A radio communication device capable of receiving a plurality of bands by changing various bands in a time division manner from U and sending data for changing the frequency to a local oscillator.