KR20000046206A - Cdma type personal communication terminal containing public wave receiver - Google Patents

Abstract

PURPOSE: A CDMA(Code Division Multiple Access) type personal communication terminal containing a public wave receiver is provided so as to obtain desired broadcasting information and to receive a public wave in the event of emergency. CONSTITUTION: A demultiplexer(20) connected to an antenna divides a mobile communication signal and a public wave signal. An amplifier(22) amplifies the public wave signal. A band pass filter part(23) passes the band of the amplified public wave signal through. A frequency tuning part(24) tunes the frequency of the band-passed public wave signal. An FM/AM tuning part(25) demodulates the tuned frequency into AM broadcasting and FM broadcasting. An audio amplification part(26) amplifies the demodulated audio signals.

Description

Code Division Multi-Access Personal Handheld Device with Built-in Air Receiver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal digital assistant of a code division multiple access (hereinafter referred to as CDMA) scheme, and more particularly to a personal digital assistant of a code division multiple access scheme incorporating an air receiver.

In general, a CDMA type personal mobile terminal is a device for a personal mobile communication service using a frequency band of 1.8 GHz, and an air wave receiver receives an AM broadcast using 535 to 1605 GHz and an FM broadcast using 88 to 108 MHz. In order to achieve this, technology for combining these two devices into one device is emerging.

1 is a block diagram showing a conventional CDMA personal portable terminal.

Referring to FIG. 1, a conventional CDMA personal portable terminal includes a duplexer 2 that designates a transmission / reception path of radio waves, a low noise amplifier 3, a bandpass filter 4, and a mixer 5. A radio frequency receiver comprising a band pass filter (6) and an automatic gain controller (7), a radio frequency transmitter comprising a power amplifier (9) connected inversely to the radio frequency receiver and connected to a final stage, the radio A base band unit 10 for up / down converting a radio frequency signal of a frequency transmitting / receiving unit and converting the signal into an analog or digital signal corresponding to an intermediate frequency, and modulating the analog or digital signal of the base band unit 10 by CDMA protocol or A mobile station modulator / demodulator 11 for demodulating and outputting, a D / A converter 12 for converting analog signals so that the digital signal demodulated through the mobile station modulator / demodulator 11 can be output to the speaker 13, a microphone ( 15) A / D converter 14 for converting the analog audio signal input through the digital signal, the key input unit 16 for inputting the user's key signal, the LCD driver 17 for driving the LCD, the data necessary for the mobile communication service And a microprocessor 18 for reading out and performing CDMA layer control, and a memory unit 19 storing the data.

The conventional CDMA personal portable terminal configured as described above processes the transmit / receive data by modulating or demodulating the transmit / receive signal using the CDMA protocol.

The antenna 1 performs a radiation or reception operation of a transmit / receive signal, and the duplexer 2 separates a transmission signal and a reception signal, and a transmission frequency signal is a radio frequency transmitter and a reception frequency signal is a radio frequency receiver. send.

At this time, the low noise amplifier 3 amplifies the RF signal of the receiver, and the RF signal is suppressed to the reception band through the band pass filter 4. The mixer unit 5 converts and outputs the RF signal restored to the reception band into an intermediate frequency signal according to the local oscillation frequency signal of the oscillator 8, and the intermediate frequency signal is set again by the band pass filter unit 16. After the band is suppressed, the gain is adjusted to a predetermined level by the automatic gain controller 7 and applied to the base band unit 10. The intermediate frequency signal applied to the base band unit 10 is separated and down-converted into I / Q channels for offset quadrature phase shift keying (QPSK) modulation. The down-converted frequency signal is restored to the original digital signal through the mobile station modulator / demodulator 11 and converted into an analog signal through the D / A converter 12 and then output to the speaker 13.

On the contrary, the voice signal input through the microphone 15 is converted into a digital signal by the A / D converter 14 and then applied to the mobile station modulator / demodulator 11. The frequency signal applied to the mobile station modulator / demodulator 11 is QPSK modulated with a transmit frequency signal, up-converted to an IF signal in baseband 10, and then output to the radio frequency transmitter. The radio frequency transmitter converts the IF signal into an RF signal, and the RF signal is amplified to a predetermined level by the power amplifier 9 and then radiated in the space through the duplexer 2 and the antenna 1.

Since the conventional CDMA personal mobile terminal is provided with a mobile communication service through a mobile public telephone network, basically, an air wave service having a different frequency band and a signal processing routine cannot be provided. There is a problem in that when receiving the service to receive the airwaves only need to pay a separate reception cost to the carrier.

Accordingly, the present invention has been made to solve the above-mentioned disadvantages of the conventional personal portable terminal, and an object of the present invention is to provide a mobile communication service as well as a mobile communication service free of charge to a mobile subscriber by embedding an aerial receiver in the personal portable terminal. The present invention provides a code division multiple-access personal portable terminal having a built-in over-the-air receiver.

1 is a block diagram showing a conventional portable terminal of the code division multiple-access method

2 is a block diagram illustrating a personal portable terminal of a code division multiple access method incorporating an air wave receiver according to the present invention;

* Description of the symbols for the main parts of the drawings *

1 antenna 2 duplexer

3: low noise amplification part 4, 6, 23: band pass filter part

5 mixer unit 7 automatic gain controller

8: oscillator 9: power amplifier

10: base band section 11: mobile station modulation / demodulation section

13 speaker 14 A / D conversion unit

15 microphone 16 keypad portion

17 display unit 18 control unit

19: data storage unit 20: demux unit

21: duplexer 22: low noise amplifier

24: air wave reception frequency tuning unit 25: AM / FM demodulation unit

26: audio amplifier 27: data storage unit

28: hierarchical control CPU 29: switching unit

In order to achieve the above objects, a feature of a code division multiple-access personal portable terminal incorporating an airwave receiver according to the present invention is characterized in that a CDMA personal portable terminal has a duplexer for designating a transmission / reception path for radio waves, and low noise. A radio wave receiver including an amplifier, a band pass filter, a mixer, a band pass filter, and an automatic gain controller, a radio frequency transmitter comprising a power amplifier connected to the final stage in reverse with the radio frequency receiver; Base band unit for up / down converting radio frequency signals of radio frequency transmitter / receiver and converting them into analog or digital signals corresponding to intermediate frequencies, and mobile station modulation for modulating or demodulating and outputting analog or digital signals of base band unit by CDMA protocol / Demodulation unit, digital scene demodulated through the mobile station modulation / demodulation unit D / A converter for converting analog output to speaker, A / D converter for converting analog voice signal input through microphone into digital signal, Key input unit for inputting user's key signal, LCD driver for driving LCD A personal processor including a microprocessor configured to read data required for a mobile communication service and an over-the-air service, and to perform CDMA layer control; And a demux unit connected to the antenna and separating a mobile communication signal and an airwave signal, an amplifier for amplifying the airwave signal, a bandpass filter unit for passing a band of the amplified airwave signal, and a frequency of the bandpass airwave signal. And an air wave receiver including a frequency tuner for tuning the signal, an FM / AM tuner for demodulating the tuned frequency AM and an FM broadcast, and an audio amplifier for amplifying the demodulated audio signal.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a personal portable terminal of a code division multiple access method incorporating an airwave receiver according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a personal portable terminal of a code division multiple access method incorporating an air wave receiver according to the present invention.

Referring to FIG. 2, a code division multi-access personal portable terminal having a built-in air receiver according to the present invention is connected to a CDMA personal portable terminal having the same configuration as that of the related art, and an antenna to separate a mobile communication signal and an aerial signal. A demux unit 20, an amplifier 22 for amplifying the airwave signal, a bandpass filter unit 23 for passing a band of the amplified airwave signal, and a frequency tuning for tuning the frequencies of the bandpassed airwave signal And an air wave receiver including an FM / AM tuner 25 for demodulating the AM frequency and the FM broadcast of the tuned frequency, and an audio amplifier 26 for amplifying the demodulated audio signal. It is.

The demux unit 20 receives the mobile communication signal and the airwave signal at the same time through the antenna and separates the two signals from the personal portable terminal of the code division multiple access system having the above-described airwave receiver. At this time, the demux unit 20 separates the transmission and reception frequencies of the mobile communication signal to the duplexer 21 and simultaneously separates and outputs the airwave signal to the airwave signal processing routine.

The mobile communication signal separated by the demux unit 20 is signal processed through the same process as before, and the airwave signal is output through the following process.

The airwave broadcasting signal separated from the demux unit 20 is low noise amplified by the low noise amplifier 22 and then applied to the band pass filter 23.

Next, the low noise amplified airwave broadcast signal is passed through the band-filt filter 23 in the airwave frequency band and then applied to the frequency tuner 24.

The air frequency signal applied to the frequency tuner 24 is tuned to a frequency band selected by the user according to the local oscillation frequency signal of the oscillator and then applied to the FM / AM demodulator 25.

Here, the frequency tuning unit 24 obtains the data necessary for tuning through the data storage unit 27 and performs tuning under the control of the hierarchical control CPU 28. At this time, the local oscillation frequency required for tuning uses the oscillation frequency of the oscillator used in the personal portable terminal as it is.

The tuned frequency signal applied to the FM / AM demodulator 25 is restored to the original audio signal suitable for FM broadcast and AM broadcast and output to the audio amplifier 26. At this time, the voice signal of the personal portable terminal and the voice signal of the over-the-air receiver are switched and output by the switching unit 29, and according to the switching operation of the switching unit 29 operated by the control of the hierarchical control CPU 28, a speaker or It is output to the earphone.

The audio signal input to the audio amplifier 26 is amplified in an audible frequency band and then output to the speaker or earphone through the switching unit 29.

Here, when the mobile communication reception signal is input during the reception of airwaves, the CPU detects this through the reception path, and preferentially receives the mobile communication signal by controlling the switching unit 29 according to the determination and control of the hierarchical control CPU 28. When the reception operation of the mobile communication signal is completed, the above-described airwave signal processing routine is performed to receive the airwave again.

As described above, the personal portable terminal of the code division multiple access method having the built-in air receiver according to the present invention has the following effects.

First, the present invention can obtain desired broadcast information by receiving airwaves with a personal portable terminal, and has an effect of receiving airwave signals in an emergency or distress.

Second, the present invention is free from the pay access service using the mobile communication service network and can listen to the airwaves free of charge, in particular, there is an effect that can receive and listen to the airwaves in the area where the mobile communication service is not provided.

Third, the present invention has the effect of receiving the mobile communication signal first priority even during the reception of the airwave signal.

Claims (2)

It consists of a duplexer for designating a transmission / reception path of radio waves, a radio noise receiver including a low noise amplifier, a band pass filter, a mixer, a band pass filter, and an automatic gain controller, and a station inverse with the radio frequency receiver. A radio frequency transmitter including a power amplifier connected to a stage, a base band unit for up / down converting a radio frequency signal of the radio frequency transmitter / receiver and converting the signal into an analog or digital signal corresponding to an intermediate frequency, and an analog or A mobile station modulator / demodulator for modulating or demodulating and outputting a digital signal through a CDMA protocol, a D / A converter for converting an analog signal to output a demodulated digital signal through the mobile station modulator / demodulator, and an analog input through a microphone A / D converter that converts audio signal into digital signal, user's key signal It reads the data necessary for driving the input keypad, LCD of LCD drive, a mobile communication service, and over-the-air service that performs CDMA-layer control microprocessor, the portable device including a memory wherein data are stored and; And A demux unit connected to the antenna and separating a mobile communication signal and an airwave signal, an amplifier for amplifying the airwave signal, a bandpass filter unit for passing a band of the amplified airwave signal, and a frequency of the bandpassed airwave signal Built-in air wave receiver comprising a frequency tuner for tuning, an FM / AM tuner for demodulating the tuned frequency AM and FM broadcast, and an audio amplifier for amplifying the demodulated audio signal. One code division multi-access personal mobile terminal. The personal digital assistant of claim 1, wherein the voice signal of the personal portable terminal and the voice signal of the over-the-air receiver are switched by a switching unit and output to a speaker or an earphone. .