KR100353441B1 - Radio receiving device and method of wireless terminal - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to a wireless terminal, and more particularly, to an apparatus and a method capable of receiving a radio at a terminal.

I. The technical problem to be solved by the invention

An existing wireless terminal can detect and listen to a radio signal.

All. Summary of Solution of the Invention

A radio receiving apparatus of a wireless terminal capable of demodulating an APS signal, the radio receiving apparatus comprising: an antenna for receiving a radio signal, an RF unit connected to the antenna for providing a received signal to a baseband analog chip, and a predetermined signal; A tuning unit for outputting a predetermined voltage to the baseband analog chip by the tuning control signal of the control unit and converting the signal to the FM mode by a predetermined mode conversion control signal, A baseband analog chip for detecting and outputting a specific frequency component oscillated by the clock voltage provided by the tuning unit, and generating the tuning control signal and the mode conversion control signal according to a user's request, A pulse is received by receiving the specific frequency component detected by generating a clock voltage. It is characterized by having an MS for converting into a modulated signal.

la. Important uses of the invention

The radio terminal is used to detect and listen to radio signals.

Description

Radio receiver device and method of wireless terminal

The present invention relates to a wireless terminal, and more particularly, to an apparatus and method for demodulating and listening to a radio signal.

Typically, the wireless terminal refers to a PCS (PERSONAL COMMUNICATION SYSTEM), a cellular terminal and the like. Such a terminal has a number of additional functions such as an electronic organizer or a phone book. However, such a terminal did not have a function to listen to the radio. Therefore, in order for a terminal user to listen to the radio, there is a problem in that the user must purchase and carry the radio separately from the terminal.

Accordingly, an object of the present invention is to provide an apparatus and method for listening to a radio in a wireless terminal.

Another object of the present invention is to provide an apparatus and method for listening to a radio without a special additional device in a wireless terminal using a BBA chip.

According to an aspect of the present invention, there is provided a radio receiving apparatus of a wireless terminal capable of demodulating an APS signal, comprising: an antenna for receiving a radio signal, and a baseband for receiving a signal connected to the antenna; RF part for providing to an analog chip, a tuning part for outputting a predetermined voltage to a baseband analog chip by a predetermined tuning control signal, and converting to an FM mode by a predetermined mode conversion control signal A baseband analog chip for detecting and outputting a specific frequency component oscillated by the clock voltage provided by the tuning unit from the signal provided by the RF unit, and the tuning control signal and mode conversion according to a user's request Generating a control signal and generating the clock voltage through the tuning unit. And an MS for converting the specific frequency component detected by the input into a pulse modulated signal.

1 is a schematic block diagram of a terminal for listening to a radio according to an embodiment of the present invention;

2 is a detailed configuration diagram of a BBA chip according to an embodiment of the present invention.

3 is a block diagram of a tuning unit for detecting a radio signal according to an embodiment of the present invention.

4 is another resonant circuit diagram added for detecting a radio signal in accordance with an embodiment of the present invention.

5 is a control flow diagram for listening to a radio in accordance with an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details appear in the following description, which is provided to aid a more general understanding of the present invention, and it should be understood by those skilled in the art that the present invention may be practiced without these specific details. It will be self explanatory. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a schematic block diagram of a terminal for listening to a radio according to an embodiment of the present invention.

The RF unit 310 is a path for transmitting a radio signal to a BBA (BASE BAND ANALOG 100) received from the antenna. The RF unit 310 switches the signal received from the antenna by the switching control signal to a low noise amplifier (LNA: LOW NOISE AMPLIFIER 140) or a duplexer (DUPLEXER 180). The AMP / BUFFER 130 amplifies, buffers, and outputs the signal output from the LNA 140. The second switch 120 switches the signal output from the AMP / BUFFER 130 or the second filter 184 to the automatic gain control 110 (AGC) by the switching control signal.

The transceiver 330 shows a block configuration of a transceiver for a general terminal, and a detailed description thereof will be omitted.

The tuning unit 320 is operated by a tuning control signal, and is a device for detecting an FM signal in a frequency band desired by a user, and includes a PLL (PHASE LOCKED LOOP 191). The RX_IF_TC 192 is a resonance circuit added to a BBA chip of a general terminal. On the other hand, in general, the output terminal of the PLL 191 has an LPF for passing the low frequency, but not shown in FIG.

The BBA 100 may process an APS signal and may be converted to a radio reception mode according to a user's request to demodulate the radio signal. The BBA 100 is capable of processing FM modulation type AMPS signals and CDMA type signals. In the present invention, a block used to demodulate an AMPS signal is used.

The MSM (MOBILE STATION MODEM 160) processes the control role of the terminal and the signal output from the BBA (100) and converts it into a PCM signal (PULSE CODE MODULATED SIGNAL). The codec 170 demodulates the PCM signal and outputs the voice signal. If the key input unit 162 has a plurality of function keys and numeric keys, the user is used for radio reception mode and tuning. The memory 163 stores a channel selection table including a plurality of channels and names corresponding to the channels. An example of such a stored table is shown below.

TABLE 1

MBC 88.9 MHz KBS 93.1 MHz ..... ..... SBS 103.7 MHz

The display unit 161 is a display device such as a liquid crystal display (LCD). The display unit 161 displays the state of the wireless terminal, the progress of the program, an alarm message, etc. under the control of the MSM 160.

2 is a detailed configuration diagram of a BBA chip according to an embodiment of the present invention.

2 shows a detailed block diagram of the BBA chip. MODE_CNTL (MODE CONTROLLER 119) selects the FM mode by the mode change control signal output from the MSM 160. That is, the MSM 160 gives a control signal to the FMB 79 to convert to the FM mode. The VCO (VOLTAGE CONTROLED OSCILLATOR Voltage Controlled Oscillator) 111 generates a specific frequency depending on the control voltages supplied through RXVCOT1 and RXVCOT2. In normal call mode, it generates a frequency of about 85.38 * 2MHz. The half divider 112 divides the frequency signal output from the VCO 111 into half to output (85.38 MHz). The mixers 113 and 114 amplify and output only the signal output from the divider 112 from the signals received by the antenna and input through the RXIFB 6 and the RXIF 7. FM_Q_RX_LPF 115 and FM_I_RX_LPF 116 are low pass filters. The FMQ_ADC 117 and the FMI_ADC 118 convert the input signals into digital signals, output them to the RXQFMDT 63 and the RXIFMDT 64, and input them to the MSM 160.

Since the frequency band of the FM radio in the country is 88 ~ 108MHz in the present invention, the signal input to the antenna directly input to the BBA (100) is used without using the filters 182, 184 of the transceiver. At this time, the station outputs a specific DC voltage through the tuning unit 320, and accordingly generates a frequency for the VCO 111 to select the desired frequency band. Of course, at this time, the frequency output from the VCO 111 is twice the frequency desired by the actual user.

3 is a block diagram of a tuning unit for detecting a radio signal according to an embodiment of the present invention.

3 shows a configuration diagram in which a tuning unit and a resonance circuit for smoothing tuning are added. As described above, the VCO 111 should be an oscillator capable of covering a specific frequency band (for example, 88 to 108 MHz) in order to demodulate a desired FM signal. However, if the performance of the oscillator does not reach this, the resonance circuit 302 can be added to improve the performance. The PLL 191 outputs a corresponding DC voltage by the tuning control signal and is filtered by the LPF 301 and provided to the resonant circuit 302.

The resonant circuit 302 includes a first resistor R1 and a second resistor R2 having one end connected to an output terminal of the low pass filter 301, the other end of the first resistor R1 and the second resistor R2. Two varactor diodes D1 and D2 having one end connected to the other end and the other end connected to the ground, and two capacitors C1 and C2 connected to one end of the varactor diodes D1 and D2, respectively. The inductance L1 is connected between the other ends of the two capacitors C1 and C2, and both ends thereof are connected to the baseband analog 100.

4 is another resonant circuit diagram added for detecting a radio signal according to an embodiment of the present invention.

The resonant circuit of FIG. 4 includes a first capacitor C1 having one end connected to an output terminal of the low pass filter 301, a first diode D1 connected to one end of the other end of the capacitor C1, and one end of the first capacitor C1. The second capacitor C2 connected to the other end of the diode D1, one end of which is connected to the other end of the second capacitor C2, and the second end of the second diode D2 connected to one end of the first capacitor C1. And a third capacitor C3, a fourth capacitor C4 having one end connected to one end of the first capacitor C1, the other end of the fourth capacitor C4 and the other end of the second capacitor C2. It is connected, and both ends are made of inductance (L1) connected to the baseband analog (100).

At this time, when a predetermined voltage is applied to both ends of the diode D1 (S1, S2), the diode is turned on / off to show a change in the capacitor capacity of the resonant circuit and a change in the resonant frequency.

[Equation 1]

5 is a control flow diagram for listening to a radio according to an embodiment of the present invention.

In step 500, if the radio receiving mode is selected, the MSM 160 forms an RF path in step 510. That is, the RF switch is formed by controlling the first switch 150 and the second switch 120. In FIG. 1, the first switch is connected to the antenna, but in order to share the LNA 181, a switch may be connected between the LNA 181 and the first filter 182 and an output terminal may be connected to the AMP / BUFFER 130. . In this case, the RF path is formed of an antenna, a duplexer 180, an LNA 181, a first switch 150, an AMP / BUFFER 130, a second switch 120, an AGC 110, and a BBA 100. do. In step 520, the MSM 160 selects the FMB 79 terminal according to the mode conversion control signal and converts the mode of the BBA 100 to the FM mode. In step 530, the MSM 160 checks whether frequency selection data is input.

That is, when the radio reception mode is selected, the channel selection table including a plurality of channels and names corresponding to the respective channels is read from the memory 163, and the channel of the channel selection table and the name of the channel are displayed on the display unit 161. . The user then selects one of the displayed channels. In step 540, the MSM 160 provides the PLL 191 with a data signal for selecting a corresponding frequency. The PLL 191 then outputs the corresponding DC voltage. The signal output from the PLL 191 is provided to the RXVCOT1 and RXVCOT2 via the low pass filter 301 and the resonant circuit 302. The VCO 111 generates and outputs a frequency that is twice the frequency according to the input DC voltage. The frequency is again distributed by the 1/2 divider and provided to the mixers 113 and 114, and the frequency components are amplified and output by the mixers 113 and 114. In step 550, the ADC 117, 118 converts the detected signal into a digital signal and inputs it to the MSM 160. Subsequent processing is the same as a general AMPS demodulation process, and further description thereof will be omitted. In the present embodiment, it can be seen that the PLL 191, the LPF 301, and the AGC 110 minimize the addition of the device to the part used in the conventional transmitting and receiving terminal 330.

Briefly, the present invention uses the FM demodulation routine used in the conventional AMPS system, and includes an RF unit 310 and a tuning unit 320 to demodulate a radio signal without the addition of a special device. It was.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention includes the RF unit 310, the tuning unit 320, and the like, and by using the FM demodulation routine used in the conventional AMPS system, there is an advantage that the radio can be listened to without additional equipment. .

Claims (10)

In the radio receiver of the radio terminal capable of demodulating the signal of the Amp system, An antenna for receiving a radio signal, An RF unit connected to the antenna for providing a received signal to a baseband analog chip; A tuning unit for outputting a predetermined voltage to a baseband analog chip by outputting a predetermined voltage according to a predetermined tuning control signal; A baseband analog chip which is converted to an FM mode by a predetermined mode conversion control signal and detects and outputs a specific frequency component oscillated by the clock voltage provided by the tuning unit from the signal provided by the RF unit; Generating the tuning control signal and the mode conversion control signal according to a user's request, and receiving the specific frequency component detected by generating the clock voltage through the tuning unit and converting the signal into a pulse modulation signal. Characterized in that the device. According to claim 1, wherein the RF portion, A first switch connected to the antenna for switching a received signal to a duplexer or a low noise amplifier; A low noise amplifier for low noise amplifying the signal switched by the first switch; An amplification / buffer for amplifying and buffering a signal output from the low noise amplifier; A second switch for switching one end of the amplification / buffer to a second filter of an output terminal or a transmission / reception terminal; And an age connected to the other end of the second switch to provide an output signal to the baseband analog chip. According to claim 1, wherein the RF portion, A first switch connected to the low noise amplifier of the transmitting and receiving end for switching to an amplification / buffer or a first filter; An amplification / buffer for amplifying and buffering a signal output from the first switch; A second switch, one end of which switches to a second filter of an output terminal or a receiving terminal of the amplification / buffer; And an age connected to the other end of the second switch to provide an output signal to the baseband analog chip. 2. The apparatus of claim 1, wherein the tuning unit comprises: a phase locked loop for generating the clock voltage according to the tuning control signal; And a low pass filter for filtering the signal at the output end of the phase locked loop to provide the baseband analog signal. The method of claim 4, wherein the tuning unit, And a resonant circuit between the output of the low pass filter and the baseband analog. The method of claim 5, wherein the resonant circuit, A first resistor and a second resistor having one end connected to an output terminal of the low pass filter, Two varactor diodes each having one end connected to the other end of the first resistor and the other end of the second resistor, and the other end connected to the ground; Two capacitors each having one end connected to one end of the varactor diode, And an inductance connected between the other ends of the two capacitors and both ends connected to the baseband analog. The method of claim 5, wherein the resonant circuit, A first capacitor having one end connected to an output terminal of the low pass filter; A first diode having one end connected to the other end of the capacitor and turned on / off by a predetermined voltage applied to both ends; A second capacitor having one end connected to the other end of the first diode, A second diode and a third capacitor having one end connected to the other end of the second capacitor and the other end connected to one end of the first capacitor; A fourth capacitor having one end connected to one end of the first capacitor, And an inductance connected to the other end of the fourth capacitor and the other end of the second capacitor, and both ends connected to the baseband analog chip. The method of claim 1, wherein the phase-locked loop, the low pass filter, and the age time, Apparatus characterized in that the phase-locked loop, low-pass filter and the age of the transmitting and receiving stage. An antenna for receiving a radio signal, an RF unit for providing a signal connected to the antenna to a baseband analog chip, and outputting a predetermined voltage by a predetermined tuning control signal to the baseband analog chip. And a specific frequency component oscillated by the clock voltage provided by the tuning unit, which is converted into the FM mode by a mode switching control signal and a predetermined mode conversion control signal. In the baseband analog chip for receiving, and receiving the specific frequency components of the MS to convert the pulse modulation signal, and a radio receiving method of a radio terminal capable of demodulating the signal of the APS system, Inputting a signal received from the antenna to the baseband analog chip by forming an RF path through the RF unit when data for selecting a radio reception mode is input; Generating an mode conversion control signal and selecting an FM mode through an FM terminal of the baseband analog chip; Checking whether the frequency selection data is input; And when the frequency selection data is input, generating the tuning control signal, detecting a corresponding frequency according to the input data, and demodulating a voice signal. The method of claim 9, wherein the checking whether the frequency selection data is input comprises: When the radio reception mode is selected, reading a tuning table comprising a plurality of channels and names corresponding to the respective channels from the memory; Displaying a channel of the read channel selection table and a name of the corresponding channel; And checking whether data for selecting one of the displayed channels is input.