JP3796223B2 - Mobile phone equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a mobile phone device that can be used outdoors.
[0002]
[Prior art]
With the development of communication technology, so-called mobile phone devices that can be carried and used outdoors have become common. By the way, such a cellular phone device performs an intermittent reception operation for detecting the presence or absence of an incoming call except when a call is made or when a call is made. It is not used as. For this reason, it is conceivable to use the mobile phone device as a radio at times other than this call, and is described in, for example, Japanese Patent Application Laid-Open No. 4-134952 (H04M 1/02). The cellular phone device according to the prior art is characterized by integrally including a cassette tape recorder unit and / or a radio unit, and is used as a cassette tape recorder or a radio when the telephone is not used.
[0003]
[Problems to be solved by the invention]
However, the above-described conventional technology includes a circuit block of the telephone device main body and a circuit block that realizes a radio function, for example, and is configured to switch these circuit blocks by a control unit as necessary. . For this reason, there has been a problem that the circuit configuration is large and is not practical as a mobile phone device that is required to be small and light.
[0004]
On the other hand, in the current mobile phone apparatus, as a countermeasure against fading, two receiving circuits are provided, two antennas are provided at spatially separated positions in each of these receiving circuits, and signals received by each receiving circuit at the time of reception A diversity reception system employing any one of the above is employed. When such a conventional technology is adopted in such a cellular phone device, a receiving circuit for radio reception is further required, which is difficult to implement with a small cellular phone device.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a cellular phone device according to a first aspect of the present invention, wherein a first antenna and a second antenna for performing diversity reception of a telephone signal, a telephone signal processing circuit for processing the telephone signal, and A third antenna for receiving a broadcast wave, a broadcast signal processing circuit for processing a broadcast signal, a first IF conversion unit for frequency-converting the reception signal of the first antenna and outputting it to the telephone signal circuit, A second IF converter that converts the frequency of a signal from the second antenna or the third antenna and outputs the converted signal to the telephone signal circuit and the broadcast signal processing circuit; and a received signal from the second antenna and a received signal from the third antenna A switch for switching one of them to be input to the second IF conversion unit, an operation means for accepting an operation for activating broadcast reception, and an entire mobile phone device. A control circuit, and when there is no operation for activating broadcast reception by the operation means, the first IF conversion unit processes a received signal from the first antenna, and the second IF conversion The first IF converter is configured to control the switch so as to perform diversity reception by processing a received signal from the second antenna, and to activate broadcast reception by the operating means. The reception signal from one antenna is processed, and the second IF conversion unit performs control so as to receive the telephone signal and the broadcast wave by switching the switch so as to process the reception signal from the third antenna. To do.
[0006]
According to a second aspect of the present invention, there is provided a mobile phone device according to the first aspect of the present invention, further comprising a call / hook switch for starting a call, wherein the control circuit is activated to receive broadcasts. When the call / hook switch is operated and a call is started, the second IF converter controls the switch so as to perform diversity reception by processing the received signal from the second antenna. It is characterized by starting .
[0007]
[Action]
In the normal standby state, the signal from one IF oscillation circuit is used in common by the two receiving circuits to perform diversity reception, and when receiving radio broadcasts in the standby state based on user settings, One of the two IF transmission circuits for the telephone is supplied to one receiving circuit, and the other for the radio is supplied to the other radio receiver to receive the radio.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the present invention, in which 1 and 2 are diversity receiving antennas arranged at a distance from each other, 3 is an antenna for receiving radio broadcasts, and 4 and 5 are for RF Bandpass filters, 6 and 7 are RF amplifiers, 8 and 9 are RF mixers that frequency-mix the received signal and the RF local signal output from the RF local oscillator 10 and convert them to IF frequencies, and 11 and 12 are IF bands. It is a path filter. Reference numeral 13 denotes a first IF mixer, and reference numeral 14 denotes a second IF mixer. The first IF mixer 13 frequency-mixes the IF local signal output from the IF local oscillator 15 and the received signal to obtain a second IF frequency. Convert. The other second IF mixer 14 outputs either the signal received by the antenna 2 or the radio signal received by the radio antenna 3 and the IF local oscillator 15 or the radio broadcast IF oscillator 16. The IF local signal is frequency mixed and converted to a second IF signal.
[0009]
17 is a first switch for switching received signals, 18 is a second switch for switching IF local signals, 19 and 20 are second IF band-pass filters, 21 and 22 are IF amplifiers, 23 is a telephone signal processing circuit, and 24 is a radio broadcast. A signal processing circuit 25, a third switch for selecting either a telephone signal or a broadcast signal and sending it to the reception speaker 26 and the earphone terminal 27, 28 a ringer speaker for outputting a notification sound indicating an incoming call, 29 A numeric keypad, 30 is a display for displaying various information, 31 is a radio reception operation button, 32 is a call / hook switch, and 33 is a control circuit for controlling the entire apparatus.
[0010]
Next, the operation of the mobile phone device according to the present invention will be described. When operating only the function of the mobile phone device, as shown in FIG. 1, the first switch 17, the second switch 18, and the third switch 25 are set to the contact A side under the control of the control circuit 33. Therefore, in this state, the signals received from the antennas 1 and 2 are band-limited by the RF bandpass filters 4 and 5, amplified by the RF amplifiers 6 and 7, and then oscillated by the RF local oscillator 10. And RF mixers 8 and 9 are frequency mixed and converted to IF frequencies. Here, 100 to 200 MHz is generally used as the IF frequency. The signal converted to the IF frequency is frequency-mixed by the IF local signal oscillated by the IF local oscillator 15 and the first and second IF mixers 13 and 14 after unnecessary components are removed by the IF bandpass filters 11 and 12. Converted to the second IF frequency. Generally, 450 to 455 KHz is used as the second IF frequency. The signal converted to the second IF frequency is subjected to removal of unnecessary components by the second IF bandpass filters 19, 20, limiter amplification by the IF amplifiers 21, 22, and input to the telephone signal processing circuit 23. The telephone signal processing circuit 23 performs necessary signal processing on the signal having the higher intensity among the signals received by the antenna 1 or 2, and sends the signal to the reception speaker 26 and the earphone terminal 27 via the third switch 25. The This is the operation in the diversity reception mode.
[0011]
Next, the operation in the standby state will be described. When the user operates the radio reception operation button 31 to receive a radio broadcast during standby, the control circuit 33 causes the first switch 17, the second switch 18, and the third switch to be operated. 25 is switched to the contact B side. Thereby, the IF local signal of the IF local oscillator 15 is supplied only to the first IF mixer 13, and the second IF mixer 14 receives the signal received from the radio receiving antenna 3 and the radio broadcast IF oscillator 16. IF local signal is input. The received radio signal is converted to the second IF frequency by the second IF mixer 14, and then input to the broadcast wave signal processing circuit 24 through the second IF bandpass filter 20 and the IF amplifier 22, and the contact point of the third switch 25. The signal is output from the speaker 26 and the earphone terminal 27 through B.
[0012]
At this time, since the signal for the telephone device input from the antenna 1 is input to the telephone signal processing circuit 23, the standby operation necessary for the telephone device can be continued even during the broadcast wave reception. When the telephone signal processing circuit 23 detects its own telephone call during this standby operation, it notifies the control circuit 33 to that effect. Based on this, the control circuit 33 sounds the ringer speaker 28 to notify the user of the incoming call. When the call / hook switch 32 is operated by the user to start a call, the control circuit 33 switches the first, second and third switches 17, 18, 25 to the contact A side. As a result, reception of the radio broadcast is interrupted and diversity reception operation is performed by the signals received by the antennas 1 and 2, and the signal from the telephone signal processing circuit 23 is output to the speaker 26 and the earphone terminal 27, A call is made.
[0013]
【The invention's effect】
As described above, according to the mobile phone device of the present invention, it is possible to perform a standby operation during reception of a radio broadcast with a simple configuration, and to quickly switch to a call operation even when listening to the radio broadcast. Can do.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a mobile phone device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st antenna 2 2nd antenna 3 3rd antenna 13 1st IF mixer 14 2nd IF mixer 15 IF local oscillator 16 Broadcasting IF local oscillator 17 1st switch 18 2nd switch

Claims (2)

A first antenna and a second antenna for diversity reception of telephone signals;
A telephone signal processing circuit for processing telephone signals;
A third antenna for receiving broadcast waves;
A broadcast signal processing circuit for processing the broadcast signal;
A first IF converter that converts the frequency of the received signal of the first antenna and outputs the converted signal to the telephone signal circuit;
A second IF converter that converts the frequency of a signal from the second antenna or the third antenna and outputs the converted signal to the telephone signal circuit and the broadcast signal processing circuit;
A switch for switching so that either the reception signal of the second antenna or the reception signal of the third antenna is input to the second IF conversion unit;
Operation means for accepting an operation for activating broadcast reception;
A control circuit for controlling the entire mobile phone device,
The control circuit processes a received signal from the first antenna in the first IF converter when the operation means does not activate broadcast reception, and the second IF converter from the second antenna. To control the switch to perform diversity reception by processing the received signal of
When there is an operation to activate broadcast reception by the operation means, the first IF converter processes the received signal from the first antenna, and the second IF converter processes the received signal from the third antenna. A mobile phone device characterized by switching the switch to receive a telephone signal and a broadcast wave . The mobile phone device according to claim 1, wherein
It has a call / hook switch to start a call,
When the call / hook switch is operated and a call is started when broadcast reception is activated , the control circuit processes a received signal from the second antenna in the second IF conversion unit to process diversity. A cellular phone device which controls the switch so as to start reception and starts a call .

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