KR200196900Y1 - Wireless video receiver for portable video frame - Google Patents

Abstract

The present invention relates to a wireless transmission and reception device of a portable image flexible half-cycle, frequency oscillator 210 for generating a reference frequency; A PEL unit 220 for dividing the oscillation frequency of the frequency oscillator 210 at a predetermined period according to a user's channel selection, comparing the frequency with the feedback frequency and outputting a voltage according thereto; A voltage controller 230 for controlling and outputting the output voltage of the PEL unit 220 to minimize the influence of the surroundings; A voltage controlled oscillator 240 for outputting a frequency according to the output signal of the voltage controller 230; A radio frequency amplifier 250 for amplifying the output signal of the voltage controlled oscillator 240 and feeding it back to the PEL 220; An FM voice transmitter 200 including a transmission output unit 260 which modulates an image signal, a song accompaniment music signal, and an audio signal by the oscillation frequency of the voltage controlled oscillator 240 and transmits it through the voice transmission / reception antenna 130; A frequency oscillator 310 generating a reference frequency; A PEL unit 320 for comparing the oscillation frequency of the frequency oscillator 310 with the feedback frequency and outputting a voltage according thereto; A voltage controller 330 for controlling and outputting the output voltage of the PEL unit 320 to minimize the influence of the surroundings; A local oscillator 340 for outputting a predetermined high frequency signal according to the output signal of the voltage controller 330; A first radio frequency amplifier (350) for amplifying the output signal of the local oscillator (340) and applying it to the PEL (320); A second radio frequency amplifier 360 for amplifying and outputting a voice signal from the wireless microphone 140 to increase sensitivity when the voice signal from the wireless microphone 140 is received; A mixing unit 370 for mixing and detecting an output signal of the second radio frequency amplifier 360 and the local oscillator 340 to output an audio intermediate frequency signal; An intermediate frequency amplifier 380 for amplifying and outputting the output signal of the mixer 370; The voice FM receiver demodulator 300 includes a detector 390 for demodulating and outputting the output signal of the intermediate frequency amplifier 380. The FM voice transmitter 200 is also installed in the wireless microphone 140. In this way, the radio frequency between the main body and the external audio device, and the wireless microphone and the main body during the radio transmission and reception to make a stable frequency using the PLL method, and to a plurality of channels as needed By converting, when crosstalk occurs due to different broadcast signals or ambient noise, the signal can be converted to another channel, thereby preventing crosstalk.

Description

Portable video half-cycle wireless transceiver

The present invention relates to a half-cycle of portable video, particularly in a half-cycle of a portable video using a video compact disc, the transmission and reception frequency of wireless transmission between the main body and an external audio device and wireless transmission and reception of the wireless microphone and the main body The present invention relates to a portable video flexible half-cycle wireless transceiver having a stable frequency using the LPL and suitable for converting into a plurality of channels as necessary.

In general, the portable video song half-cycle allows users to sing through wired / wireless microphones according to the accompaniment music output from the speaker while watching video and subtitles appearing on the screen. It is used to practice singing or to relieve stress. .

And such a portable image flexible half cycle can be well explained by the "application of a portable image flexible half cycle using a video compact disc" patent application No. 96-17343 filed by the applicant to the Korean Intellectual Property Office. Briefly, it is as follows.

1 is a block diagram of a portable image flexible half-cycle using a conventional video compact disc, and as illustrated therein, a system control unit 20 for collectively controlling the functions of the system; A voice detector 30 for detecting a voice signal according to a switching control action of the system controller 20; A VCD control unit 40 for reproducing an image signal according to the output control signal of the system control unit 20; PLC / FPGA controller 50 for outputting the corresponding video and subtitle signals stored in the video semiconductor memory according to the output control signal of the system control unit 20, and outputs the accompaniment signal and the user's audio signal stored in the voice semiconductor memory. )Wow; A video selector 60 for selecting one of an external video signal line and a video signal of the VCD controller 40 and the PLC / FPGA controller 50 according to the selection switching signal of the system controller 20 and mixing the subtitles with the subtitles and outputting them; An audio selector for selecting one of an external audio signal line and an accompaniment music signal of the VCD controller 40 and the PLC / FPGA controller 50 according to the selection switching signal of the system controller 20 and mixing the audio signal with the user's voice signal to output the audio selector ( 70); A TV RF modulator (90) for modulating and outputting video, subtitles, accompaniment music, and a user's audio signal of the video selector (60) and the audio selector (70) into a television channel signal; A TV wireless transmitter (100) for modulating and outputting the output signals of the video selector (60) and the audio selector (70); An FM voice transmitter 120 for modulating and outputting a voice signal connected to an output terminal of the audio selector 70 into an FM signal; A voice FM reception demodulator 150 which receives and processes the voice signal and transmits the voice signal to the voice detector 30 when the voice signal of the user is input via the wireless microphone 140; The control signal detection and demodulation unit 160 is applied to the system controller 20 to receive and process the control signals of the wireless microphone 140.

In addition, a switching switch (SW) for switching each voice signal according to a switching control signal of the system control unit 20 is connected to one end of the voice detection unit 30, the wired microphone, and the voice FM reception demodulation unit 150. One end of the system control unit 20 is connected to a key input unit 10 for inputting a function setting signal of the user, and an earphone amplifier 80 is connected to an output terminal of the audio selector 70. In addition, a transmission antenna 110 is connected to the output terminal of the TV wireless transmitter 100, and an audio transmission / reception antenna 130 is connected to one end of the FM voice transmitter 120, and the system controller 20 The output terminal of the VCD controller 40 and the PLC / FPGA controller 50 is connected to a display unit 170 for displaying the operation state inside the system to the outside.

Here, the voice FM reception demodulation unit 150 and the control signal detection demodulation unit 160 receive the signal of the wireless microphone 140 wirelessly via the antennas 110 and 130, the wireless microphone 140. Some of the body is provided with a plurality of control buttons to wirelessly control the system.

In addition, a separate wired microphone may be connected to support two people singing, and the display unit 170 is formed of a liquid crystal display (LCD), for example, the operation of the VCD control unit 40. It is divided into a part for indicating a state and a part for indicating an operation state of the PLC / FPGA control unit 50.

On the other hand, the VCD control unit 40 may be installed to be detachable to one end of the main body, and can play not only the VCD but also the DVD.

Hereinafter, look at the operation as follows.

First, the user is mounted in the compact disc mode, that is, the VCD control unit 40 by using a control button installed in the key input unit 10 or the wireless microphone 140 installed on the front panel (not shown) of the main body. The user can set the mode in which the background image signal is supported from the VCD or the DVD, or select one of the computer modes, that is, the mode supported from the image signals stored in the image / caption memory in the PLC / FPGA controller 50 in a package form.

If the user sets the compact disc mode or the computer mode, for example, the compact disc mode is set, the system control unit 20 selects the VCD control unit 40 to display the reproduced VCD or DVD signal. It will be used as wallpaper.

At this time, the system control unit 20 controls the path of the switching switch SW at the same time as the driving operation of the VCD control unit 40, so that the audio signal input from the wired microphone is transferred to the switching switch SW and the voice detecting unit ( 30 to be applied to the audio selector 70 through the VCD control unit 40.

On the other hand, when the user's voice signal is input from the wireless microphone 140, it is demodulated via the voice transmission / reception antenna 130 and the voice FM reception demodulation unit 150 and then through a switching switch (SW) and a voice detection unit (30). It is applied to the audio selector 70 through the VCD control unit 40.

Then, the video selector 60 switches the video signal and the caption signal input from the VCD controller 40 according to the control command of the system controller 20, and the TV RF modulator 90 and the TV wireless transmitter 100 and the line. Outputs the selected line among the image output signal lines. The audio selector 70 also switches the external audio signal and the accompaniment music signal input from the audio filter in the VCD controller 40 according to the control command of the system controller 20. The TV RF modulator 90 and the TV wireless transmitter 100 ) And the FM voice transmitter 120, the earphone amplifier 80, and the line voice output signal line is selected to output respectively.

At this time, if the user wants to view the background screen by the television receiver using a wired TV RF modulator 90 is selected. The TV RF modulator 90 modulates the video and subtitle signals input from the video selector 60 and the accompaniment music and audio signals input from the audio selector 70 to the 3, 4, and channels of the television and outputs the wires. This allows accompaniment music and song voices to be output along with images and subtitles from a television (not shown).

On the other hand, if the user wants to view the background screen with a wireless television receiver using the TV radio transmitter 100 is selected, the TV radio transmitter 100 is a video and subtitle input from the video selector 60 The signal and the accompaniment music and audio signal input from the audio selector 70 are modulated into a high frequency signal and air-propagated through the transmission antenna 110 so that a specific channel (not 3 or 4 channels) of the television (not shown) is transmitted. Accompanied music and song voices are to be output along with video and subtitles.

In addition, if the user wants to transmit the embodiment of the present invention as an FM signal, the FM voice transmitter 120 is selected, wherein the FM voice transmitter 120 is accompaniment music, voice input from the audio selector 70 The signal is modulated into an FM high frequency signal to be air propagated through the voice transmission / reception antenna 130 to output accompaniment music and song sound from a specific frequency band of the FM radio receiver (not shown).

Here, the video selector 60 and the audio selector 70 may also support an external video signal or an external audio signal. In this case, the external video signal may be an external video device such as a laser disk player, a video tape recorder, a CCD camera, or the like. The signal input from the camera may be included. In particular, when the CCD camera is connected as an external video device, the user's appearance is displayed on the screen.

In this case, when the control signal is input using the wireless microphone 140, the control buttons installed on the body of the wireless microphone 140 may be used. When the control button is pressed, the control command signal is the wireless microphone 140. The control command signal is received by the voice transmission and reception antenna 130 wirelessly through the. Then, the control command signal received by the voice transmission / reception antenna 130 is demodulated through the control signal detection demodulation unit 160 and then input to the system control unit 20 to be executed. At this time, the system control unit 20 generates and outputs data such that a main command among the control commands input from the key input unit 10 or the wireless microphone 140 can be displayed on the screen (On Screen Display, OSD). do

On the other hand, when the computer mode is set by the user during the execution of the compact disc mode, the system controller 20 applies the cutoff control signal to the VCD controller 40 to stop the operation of the VCD controller 40 and the PLC / FPGA controller ( 50 to apply an operation control signal.

Then, the PLC / FPGA controller 52 reads out the corresponding video and subtitle data set from the control buttons of the key input unit 10 or the wireless microphone 140 from the internal memory and outputs these signals to the video selector 60 and the audio selector ( To 70).

Then, the video selector 60 switches the video signal and the subtitle signal inputted from the video encoder 57 of the PLC / FPGA unit 50 according to the control command of the system control unit 20, and the TV RF modulator 90 The wireless transmitter 100 outputs the selected line among the line image output signal line.

Similarly, the audio selector 70 switches the external audio signal and the accompaniment music signal input from the buffer filter 5D of the PLC / FPGA unit 40 according to the control command of the system controller 20. The WTV transmitter 100, the FM voice transmitter 120, the earphone amplifier 80, and the line voice output signal lines are respectively output to the selected line.

Here, the earphone amplifier 80 connected to the audio selector 70 amplifies and outputs accompaniment music and a voice signal input from the audio selector 70 so that the accompaniment music and song voice are output to the earphone (not shown). do. In addition, the display unit 170 displays the control signal and data signal processing status input from the system controller 160, the VCD controller 40, and the PLC / FPGA controller 50 to the outside.

As described above, since only one fixed frequency is used when transmitting / receiving the microphone and the main body and when transmitting and receiving the main body and the audio device, the transmission / reception frequency becomes unstable when crosstalk with other broadcasting frequencies occurs depending on the region. There was a problem of becoming uncomfortable.

The purpose of the present invention is to solve the above problems by stabilizing the frequency by using the PEL method for wireless transmission and reception between the wireless microphone and the main body and the main body and the audio device, and at the same time to separate into a plurality of channels as necessary The present invention provides a portable video flexible half-cycle wireless transceiver capable of preventing crosstalk.

1 is a block diagram of a portable image flexible half-cycle using a conventional compact disk.

2 is a block diagram of an FM voice transmitter in the present invention.

3 is a block diagram of a voice FM receiver demodulation unit according to the present invention;

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

200: FM voice transmitter 210,310: frequency oscillator

220,320 PEL part 230: voltage control unit

240: voltage controlled oscillator 250: radio frequency amplifier

260: transmission output unit 221, 321: first divider

222,322: second divider 223,323: comparison output

224,324: Voltage output part 300: Voice FM reception demodulation part

310: frequency oscillator 330: voltage controller

340: local oscillation unit 350: the first radio frequency amplifier

360: second radio frequency amplifier 370: mixing unit

380: intermediate frequency amplifier 390: detector

Portable video flexible half-cycle wireless transceiver for achieving the object of the present invention is to mix the audio signal of the user via wired and wireless microphones with the video signal and the accompaniment music signal from the VCD or DVD or memory and the In the portable song half-cycle configured to output through, divide the reference frequency into a predetermined period according to the user's channel selection, stabilize it using the PEL method, and then input the video signal, the song accompaniment music signal, and An FM voice transmitter for modulating and transmitting an audio signal at its stable frequency; The apparatus further includes a voice FM receiving demodulator for dividing the reference frequency into predetermined periods according to a user's channel selection, stabilizing the frequency using the PEL method, and then mixing and demodulating it with a radio signal received through an antenna. To configure.

Hereinafter, the operation and effects of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram of an FM voice transmitter 200 according to the present invention, and a frequency oscillator 210 for generating a reference frequency as shown therein; A PEL unit 220 for dividing the oscillation frequency of the frequency oscillator 210 at a predetermined period according to a user's channel selection, comparing the frequency with the feedback frequency and outputting a voltage according thereto; A voltage controller 230 for controlling and outputting the output voltage of the PEL unit 220 to minimize the influence of the surroundings; A voltage controlled oscillator 240 for outputting a frequency according to the output signal of the voltage controller 230; A radio frequency amplifier 250 for amplifying the output signal of the voltage controlled oscillator 240 and feeding it back to the PEL 220; The video signal, the song accompaniment music signal, and the audio signal are composed of a transmission output unit 260 which modulates the oscillation frequency of the voltage controlled oscillator 240 and transmits it through the voice transmission / reception antenna 130.

3 is a block diagram of the voice FM receiving demodulator 300 according to the present invention, and a frequency oscillator 310 for generating a reference frequency as shown therein; A PEL unit 320 for comparing the oscillation frequency of the frequency oscillator 310 with the feedback frequency and outputting a voltage according thereto; A voltage controller 330 for controlling and outputting the output voltage of the PEL unit 320 to minimize the influence of the surroundings; A local oscillator 340 for outputting a predetermined high frequency signal according to the output signal of the voltage controller 330; A first radio frequency amplifier (350) for amplifying the output signal of the local oscillator (340) and applying it to the PEL (320); A second radio frequency amplifier 360 for amplifying and outputting a voice signal from the wireless microphone 140 to increase sensitivity when the voice signal from the wireless microphone 140 is received; A mixing unit 370 for mixing and detecting an output signal of the second radio frequency amplifier 360 and the local oscillator 340 to output an audio intermediate frequency signal; An intermediate frequency amplifier 380 for amplifying and outputting the output signal of the mixer 370; And a detector 390 for demodulating and outputting the output signal of the intermediate frequency amplifier 380.

In FIG. 2 and FIG. 3, the PEL parts 220 and 320 include: first dividers 221 and 321 for dividing the output frequency of the frequency oscillating parts 210 and 310 at a predetermined period; A second divider (222, 322) for dividing and outputting the output signal of the radio frequency amplifier (250) (350) at a predetermined period; A comparison output unit (223) (323) for comparing the output frequencies of the first divider (221) (321) and the second divider (222) (322) and outputting a corresponding signal; The voltage output unit 224 or 324 outputs a voltage according to the output signal of the comparison output unit 223 or 323.

The FM voice transmitter shown in FIG. 5 is also installed in the wireless microphone 140.

Hereinafter, the operation will be described.

First, the overall operation is the same as that of the conventional apparatus shown in FIG. Therefore, the operation of the FM voice transmitter 200 and the voice FM receiver demodulator 300 will be described.

First, the operation of the FM voice transmitter 200 will be described. The frequency oscillator 210 oscillates and outputs a predetermined reference frequency that is a reference for phase control, that is, for stable frequency control.

When the reference frequency is oscillated by the frequency oscillator 210, the first divider 221 divides the output frequency of the frequency oscillator 210 into a predetermined divided value according to a user's selection and outputs the divided frequency.

Then, the comparison output unit 223 uses the output signal of the first divider 221 as a reference value and compares it with the signal fed back through the second divider 222 and outputs a control signal accordingly. If the value is smaller than the reference value, the control signal is output to increase the voltage toward the '+' side by the difference signal. If the feedback signal value is larger than the reference value, the control signal is to increase the voltage toward the '-' side as the difference signal. Outputs

When the comparison value is output by the comparison output unit 223 as described above, the voltage output unit 224 outputs a voltage according to the control signal of the comparison output unit 223, and the voltage control unit 230 outputs the voltage. The output signal of the unit 224 is input to the voltage controlled oscillator 240 by controlling it to have the least influence on the surroundings.

The voltage controlled oscillator 240 is a circuit for oscillating a frequency, and outputs an oscillation frequency according to an output signal of the voltage controller 230 and applies it to the transmission output unit 260 and the radio frequency amplifier 250.

Then, the RF amplifier 250 amplifies and outputs the oscillation frequency of the voltage controlled oscillator 240, and the second divider 222 divides the output signal of the RF amplifier 250 by a predetermined period. The comparison output unit 223 is applied.

In other words, the PEL unit 220, that is, the first divider 221, the second divider 222, the comparison output unit 223, and the voltage output unit 224 are the reference frequencies input from the frequency oscillator 210. And the oscillation frequencies of the voltage controlled oscillator 240 are compared with each other, and stable without being affected by resistors and capacitors (R, C; not shown) mounted on a printed circuit board on which a circuit is constituted by electronic components. To control the frequency.

When the stable frequency is output through the voltage controlled oscillator 230 as described above, the transmission output unit 260 modulates the audio signal from the audio selector 70 of FIG. 1 to the FM frequency from the voltage controlled oscillator 230. It transmits through the voice transmission and reception antenna 130.

The radio signal (airwaves) transmitted through the voice transmission / reception antenna 130 is output through an external audio device located at a predetermined distance.

At this time, the audio device is generally tuned to the FM frequency of 98.3MHz band, the radio broadcasting frequency and cross-talk may occur depending on the region.

When using the portable video flexible half cycle through the other audio device as described above, if crosstalk with other broadcasting frequencies occurs, the frequency channel may be increased or decreased using the key input unit 10 of the main body.

In more detail, the transmission frequency on the basis of 98.3 Hz is increased or decreased through the key input unit 10 of the main body to convert up to 16 channels. When the channel is changed in this way, the system controller 20 outputs a channel selection signal according to the selected channel.

The channel selection signal output from the system control unit 20 is applied to the first divider 221 of the PEL unit 220. Accordingly, the first divider 221 sets the reference frequency of the frequency oscillator 210. Dividing the frequency so that it is appropriate for the changed channel.

In this way, by switching channels to select the frequency that transmits and receives the best, you can use the song cycle without any confusion with other broadcasting frequencies.

The FM voice transmitter 200 as described above is also installed in the wireless microphone 140. Since the wireless microphone 140 generally uses a frequency of 219.3 MHz, interference or noise may be caused by other broadcasting frequencies or other surrounding environments. When it occurs, it is possible to transmit cleanly by converting up to 16 channels based on 219.3MHz using the dip switch attached to the external panel.

On the other hand, the output signal from the wireless microphone 140 is received through the voice transmission and reception antenna 130 is applied to the voice FM reception demodulation unit 300, the PEL unit 320 in the voice FM reception demodulation unit 300 The frequency is stabilized through the same operation as the PEL 220 in the FM voice transmitter 200.

That is, when the reference frequency is output from the frequency oscillator 310, the first divider 321 divides the reference frequency into a divided value according to the user's selection and outputs the divided frequency. Then, the comparison output unit 323 compares the signal from the first divider 321 with the feedback signal from the second divider 322 and outputs a corresponding comparison signal. The voltage corresponding to the comparison signal from the comparison output unit 323 is output.

When a predetermined voltage is output from the voltage output unit 324 as described above, the voltage control unit 330 applies it to the local oscillation unit 340 while controlling it to have the least influence on the surroundings.

Then, the local oscillator 340 generates and outputs a high frequency signal according to the input voltage, and the high frequency signal is amplified by the first radio frequency amplifier 350 and then divided by the second divider 322. The comparison output unit 323 is applied. As a result, a stable local oscillation frequency is output.

When the voice signal from the wireless microphone 140 is received through the voice transmission / reception antenna 130 in a state where the stable local oscillation frequency is generated as described above, the second radio frequency amplifier 360 amplifies the signal to increase sensitivity. The mixer 370 mixes the output signal of the second radio frequency amplifier 360 and the output signal of the local oscillator 340 to output an amplification frequency signal.

The intermediate frequency signal output by the mixing unit 370 is amplified by the intermediate frequency amplifier 380, demodulated by the detector 390 into the original signal, and the voice detection unit 30 through the switching switch SW. Is applied.

The voice signal applied to the voice detector 30 is output through a TV or an external audio device or earphone through a predetermined path.

In this case, when the frequency channel is converted using the dip switch in the wireless microphone 140 as described above, since the reception operation of the voice FM receiving demodulator 300 of the half-period main body must also be changed, the conversion is performed in the wireless microphone 140. The channel is converted using the key input unit 10 in the same manner as the channel.

Then, the system controller 20 applies the channel selection signal to the first divider 321 in the PL unit 320 to control the frequency division so as to be a frequency suitable for the converted channel.

As described above, the present invention can stabilize the frequency by using the PEL method for wireless transmission between the main body and the audio device and wireless transmission between the microphone and the main body, and crosstalk is caused by other broadcasting signals or ambient noise. If this occurs, it can be switched to another channel, thereby preventing crosstalk.

Such effects of the present disclosure may be modified and used by those skilled in the art without departing from the gist of the present invention in the karaoke apparatus field.

Claims (4)

In order to play back images, subtitles and accompaniment music from a semiconductor memory storing image data, subtitle data and accompaniment music data, and a compact disc storing the image data, the subtitle data and the accompaniment music data, respectively. Control unit, PLC / FPGA control unit, audio selector, video selector, system control unit, key input unit, wireless microphone, control signal detection demodulation unit, audio detection unit, TV wireless transmitter, TV transmission antenna, Claims [1] A portable video flexible half-cycle wireless transceiver comprising an audio transmission / reception antenna, a display unit, and a TV RF modulator; It is connected to the output terminal of the audio selector, divides the reference frequency into a predetermined period according to the user's channel selection, stabilizes the frequency using the PEL method, and then inputs an image signal, a song accompaniment music signal, and a user's voice. An FM audio transmitter for variably modulating the signal into an FM signal of a predetermined transmission frequency separated from surrounding jammers; The voice signal input via the wireless microphone is divided at a predetermined period according to a user's channel selection, and the voice signal is subjected to a variable modulation process using a Piel method to a received signal having a predetermined transmission frequency spaced apart from surrounding jammers. Portable video flexible half-cycle wireless transmitting and receiving device further comprising an FM receiving demodulation unit. The method of claim 1; The FM voice transmitter, A frequency oscillator for generating a reference frequency; A PEL unit which divides the oscillation frequency of the frequency oscillator into a predetermined period according to a channel selection of a user, and outputs the feedback frequency and the voltage according thereto; A voltage control unit for controlling and outputting the output voltage of the PEL unit so that the residual wave influence of the surrounding is minimized; A voltage controller which outputs a frequency corresponding to an output signal of the voltage controller; A radio frequency amplifier for amplifying the output signal of the voltage controlled oscillator and feeding the feedback to the PEL unit; And a transmission output unit which modulates an image signal, a song accompaniment music signal, and an audio signal into an oscillation frequency of the voltage controlled oscillator and transmits the same through an audio transmission / reception antenna. The method of claim 1; The voice variable FM receiving demodulation unit, A frequency oscillator for generating a reference frequency; A PEL unit for dividing the outgoing frequency of the frequency oscillator into a predetermined period according to a user's channel selection, and outputting the feedback frequency and the voltage according thereto; A voltage control unit controlling and outputting the output voltage of the PEL unit to minimize the influence of surrounding radio waves; A local oscillator for outputting a predetermined high frequency signal according to the output signal of the voltage controller; A first radio frequency amplifier for amplifying an output signal of the local oscillation unit and applying it to the PEL unit; A second radio frequency amplifier for amplifying and outputting a voice signal from a wireless microphone through a voice transceiving antenna to increase sensitivity; A mixing unit which mixes and detects an output signal of the second radio frequency amplifier and the local oscillation unit to output an audio intermediate frequency signal; An intermediate frequency amplifier for amplifying and outputting the output signal of the mixer; And a detector for demodulating and outputting the output signal of the intermediate frequency amplifier. According to claim 2 to 3; The PEL part, A first divider for dividing the output frequency of the frequency oscillator at a predetermined period; A second divider for dividing the output signal of the radio frequency amplifier by a predetermined period and outputting the divided signal; A comparison output unit comparing the output frequency of the first divider and the second divider and outputting a different signal; And a voltage output unit for outputting a voltage according to the output signal of the comparison output unit.