KR100714575B1 - Digital television broadcasting receiving module, and mobile communication terminal with the same - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital TV broadcast receiving module capable of precisely adjusting a trap point in a transmission signal such as GSM in a digital TV broadcast receiving module embedded in a mobile communication terminal and a mobile communication terminal having the same.

The present invention is a broadcast signal passing filter connected to a broadcast receiving antenna for receiving a digital TV broadcast signal, passing through the RF signal through the broadcast receiving antenna in a predetermined frequency band; A level detector detecting a level of the RF signal passing through the broadcast signal passing filter; A trap controller for outputting a trap control voltage according to the detection level detected by the level detector; And a variable trap unit configured to vary a trap point according to a trap control voltage from the trap control unit and to trap a frequency corresponding to the trap point among frequency bands that have passed through the broadcast signal pass filter.

The present invention also proposes a mobile communication terminal including the digital TV broadcast receiving module.

Mobile communication terminal, GSM phone, Digital TV broadcasting receiving module, DVB-H receiving module, GSM trap

Description

Digital TV broadcasting reception module and mobile communication terminal having the same {DIGITAL TELEVISION BROADCASTING RECEIVING MODULE, AND MOBILE COMMUNICATION TERMINAL WITH THE SAME}

1 is a block diagram of a GSM telephone having a conventional digital TV broadcast receiving module.

2 is a frequency characteristic diagram of the digital TV broadcast receiving module of FIG. 1;

3 is a block diagram of a mobile communication terminal having a digital TV broadcast receiving module according to the present invention;

4 is a frequency characteristic diagram of the digital TV broadcast receiving module of FIG. 3;

Explanation of symbols on the main parts of the drawings

100: communication transmitting and receiving module 200: digital TV broadcasting receiving module

210: broadcast signal passing filter 220: level detector

230: trap control unit 240: variable trap unit

ANT-B: Broadcast receiving antenna ANT-C: Communication antenna

Vd: Detection level Vref: Reference level

Vtc: Trap Control Voltage VFR: Variable Trap Frequency Range

TP: Trap Point

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to mobile communication terminals such as cellular phones, PDAs, and wireless telephones. In particular, in a digital TV broadcasting reception module embedded in a mobile communication terminal, a trap point is precisely adjusted to a transmission signal such as a global system for mobile communication (GSM). The present invention relates to a digital TV broadcast receiving module capable of accurately trapping high power transmission signals and improving reception sensitivity of digital TV broadcast such as DVB-H, and a mobile communication terminal having the same.

Recently, with the advent of digital TV broadcasting service in Korea and the development of digital broadcasting technology, DMB (Digital Mutimedia Broadcasting) technology, which enables digital TV broadcasting service, has been attracting attention.

These DMBs are classified into satellite DMBs (S-Band: 2.535-2.655GHz) and terrestrial DMBs (Band III: 174-216MHz), which are primarily intended for mobile broadcasting services through portable receivers (mobile phones, PDAs) or vehicle receivers. In addition, the terrestrial DMB is a digital multimedia broadcasting covering all audio, video and data services, and Eureka-147 (EUropean REserch Coordination Agency project), a technical standard of digital audio broadcasting (DAB) currently being implemented in Europe. -147) as its parent.

In such DMB, video transmission and reception are possible in MPEG-4 and MOT protocol (Motion Object Transfer Protocol), and the world's attention is being paid to video receiving technology using MPEG-4 in such terrestrial DMB.

On the other hand, the European service corresponding to the Korean DMB service as described above is Digital Video Broadcasting (DVB-H) (Handheld devices), the module capable of receiving DVB-H is a mobile phone, etc. Is mounted on the mobile communication terminal.

1 is a block diagram of a GSM telephone having a conventional digital TV broadcast receiving module.

The GSM telephone having the digital TV broadcast receiving module shown in FIG. 1 performs GSM communication using a frequency band of approximately 880 MHz to 915 MHz through a communication antenna ANT1, and is connected to the communication antenna ANT1 to transmit a signal. Digital TV broadcasting (DTV) such as DVB-H using a GSM communication module 10 including a power amplifier PA that amplifies the power of the STX, and a frequency band of about 470 MHz to 860 MHz through the broadcast antenna ANT2. TV receiving module 20 for receiving).

Since the GSM phone has a broadcast frequency and a communication frequency adjacent to each other, and the power of the transmission signal STX is very high among the communication signals, when such a high power transmission signal STX is input to the TV receiving module 20, the Since the interference between the high power transmission signal STX and the broadcast signal SB is generated and the broadcast reception sensitivity is significantly reduced, the TV reception module 20 should remove the GSM communication signal, especially the transmission signal.

The TV broadcast receiving module 20 includes a filter 21 for passing a TV broadcast signal using a frequency band of about 470 MHz to 860 MHz, and a trap unit for blocking a GSM communication signal included in a frequency band of about 880 MHz to 915 MHz ( 22). The frequency characteristics of the TV filter 21 and the trap unit 22 will be described with reference to FIG. 2.

FIG. 2 is a frequency characteristic diagram of the TV broadcast receiving module of FIG. 1.

FIG. 2A is a frequency characteristic diagram of the filter 21. Ideally, the filter 21 passes 470 to 860 MHz, which is a frequency band of a TV broadcast. However, the filter 21 implemented as the module is shown in FIG. Since the selectivity is not excellent because of its characteristic, it is impossible to steeply remove more than 860 MHz, so that the GSM communication frequency component of about 880 MHz to 915 MHz is also passed by the filter 21 at a constant level.

FIG. 2B is a frequency characteristic diagram of the trap unit 22, in which the trap unit 22 removes approximately 880 MHz to 915 MHz GSM transmission frequency in the frequency band passed through the filter 21. FIG. A trap point is formed at a frequency of 880 MHz to 915 MHz to prevent the GSM broadcast signal from being input to the TV broadcast receiving module 20.

However, as shown in FIG. 2 (c), due to various reasons such as component variation, temperature influence, and practical difficulty of optimum design, the trap 22 does not accurately form a trap point at the GSM transmission frequency. In this case, a GSM transmission frequency having a very high power is input to the TV broadcast receiving module, thereby adversely affecting the TV broadcast signal, such as causing interference with the TV signal, thereby degrading TV reception performance. have.

The present invention has been proposed to solve the above problems, the object of which is in a mobile communication terminal such as a mobile phone, PDA, wireless telephone, in a digital TV broadcast receiving module embedded in the mobile communication terminal, GSM (Global System for Mobile Communication) Digital TV broadcast receiving module and mobile communication having the same to improve the reception sensitivity of digital TV broadcast such as DVB-H by trapping high power transmission signal accurately In providing a terminal.

In order to achieve the above object of the present invention, the digital TV broadcast receiving module of the present invention is connected to a broadcast receiving antenna for receiving a digital TV broadcast signal, and converts an RF signal through the broadcast receiving antenna into a preset frequency band. A broadcast signal passing filter passing through; A level detector detecting a level of the RF signal passing through the broadcast signal passing filter; A trap controller for outputting a trap control voltage according to the detection level detected by the level detector; And a variable trap unit configured to vary a trap point according to a trap control voltage from the trap control unit and to trap a frequency corresponding to the trap point among frequency bands that have passed through the broadcast signal pass filter.

The digital TV broadcast receiving module is a DVB-H receiving module for receiving a DVB-H signal using a frequency band of approximately 470 MHz to 702 MHz.

The digital TV broadcast receiving module is applied to a GSM telephone using a frequency band of approximately 880 MHz to 915 MHz.

The trap control unit compares the detection level detected by the level detection unit with a preset reference level, and controls the variation of the trap point within a preset variable trap frequency range when the detection level is greater than the reference level. It is characterized in that to provide a trap control voltage to the variable trap unit.

When the detection level is not greater than the reference level, the trap control unit may provide a trap control voltage to the variable trap unit for fixed control to a current trap point.

The trap control unit is characterized in that the variable trap frequency range is set to approximately 880MHz ~ 915MHz frequency band.

The variable trap unit is characterized in that the trap point is tuned to the frequency of the GSM transmission signal in accordance with the trap control voltage.

In addition, in order to achieve the object of the present invention, a mobile communication terminal of the present invention, a communication transmitting and receiving module for transmitting and receiving a mobile communication signal through the communication antenna; And a broadcast signal passing filter connected to a broadcast receiving antenna and configured to pass the RF signal through the broadcast receiving antenna in a predetermined band, and a level detector detecting the level of the RF signal passing through the broadcast signal passing filter. A trap control unit for outputting a trap control voltage according to the detection level detected by the level detection unit, and a trap point variable according to the trap control voltage, and corresponding to the trap point in a frequency band passing through the broadcast signal pass filter. And a digital TV broadcast receiving module including a variable trap unit for trapping frequencies.

The digital TV broadcast receiving module is a DVB-H receiving module for receiving a DVB-H signal using a frequency band of approximately 470 MHz to 702 MHz.

The mobile communication terminal is a GSM telephone using a frequency band of approximately 880 MHz to 915 MHz.

The trap control unit compares the detection level detected by the level detection unit with a preset reference level, and controls the variation of the trap point within a preset variable trap frequency range when the detection level is greater than the reference level. It is characterized in that to provide a trap control voltage to the variable trap unit.

When the detection level is not greater than the reference level, the trap control unit may provide a trap control voltage to the variable trap unit for fixed control to a current trap point.

The trap control unit is characterized in that the variable trap frequency range is set to approximately 880MHz ~ 915MHz frequency band.

The variable trap unit is characterized in that the trap point is tuned to the frequency of the GSM transmission signal in accordance with the trap control voltage.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

3 is a block diagram of a mobile communication terminal having a digital TV broadcast receiving module according to the present invention.

Referring to FIG. 3, the mobile communication terminal of the present invention includes a communication transmission / reception module 100 for transmitting and receiving a mobile communication signal for a telephone call, and a digital TV broadcast reception module for receiving a digital TV broadcast signal ( 200).

The communication transmission / reception module 100 is connected to a communication antenna (ANT-C), transmits and receives a mobile communication signal through the communication antenna (ANT-C), and a power amplifier for amplifying a transmission signal with sufficient power for transmission ( PA).

The digital TV broadcast receiving module 200 is connected to a broadcast receiving antenna (ANT-B), and the broadcast signal passing filter 210 for passing an RF signal through the broadcast receiving antenna ANT-B into a predetermined band. ), A level detection unit 220 for detecting a level of the RF signal passing through the broadcast signal passing filter 210, and a trap control voltage Vtc according to the detection level Vd detected by the level detection unit 220. Trap point TP is varied according to the trap control unit 230 and the trap control voltage Vtc, and the trap point TP is among the frequency bands that have passed through the broadcast signal pass filter 210. Variable trap unit 240 for trapping the frequency corresponding to the.

In addition, the digital TV broadcast receiving module 200 may be configured as a DVB-H receiving module for receiving a DVB-H signal using a frequency band of approximately 470 MHz to 702 MHz, and the mobile communication terminal is approximately 880 MHz to 915 MHz. It can consist of a GSM telephone using a frequency band.

The broadcast signal pass filter 210 passes a frequency band of approximately 470 MHz to 702 MHz, which is a UHF band among TV frequency bands, and includes a band pass filter (BPF) or a low pass filter (LPF) capable of passing such a frequency band. Can be implemented.

The level detection unit 220 is a well-known circuit unit for detecting the magnitude of the analog signal, and a detailed description thereof will be omitted.

The trap controller 230 compares the detection level Vd detected by the level detector 220 with a preset reference level Vref, and the detection level Vd is greater than the reference level Vref. In this case, a trap control voltage Vtc is provided to the variable trap unit 240 to control the variation of the trap point TP within a preset variable trap frequency range VFR, and the detection level Vd is provided. If it is not greater than the reference level Vref, the variable trap unit 240 is provided with a trap control voltage Vtc for fixed control to the current trap point TP. In addition, the trap control unit 230 may set the variable trap frequency range (VFR) to approximately 880MHz to 915MHz frequency band.

The level detector 220 and the trap controller 230 may be included in an RF circuit unit or an IF circuit unit implemented as an IC.

The variable trap unit 240 is configured to tune the trap point to the frequency of the GSM transmission signal in accordance with the trap control voltage Vtc.

4 is a frequency characteristic diagram of the digital TV broadcast receiving module of FIG.

In FIG. 4, PB is a pass band by the broadcast signal pass filter 210, VFR is a variable trap frequency range, TP is a trap point formed by the variable trap unit 240, and TP1, TP2 and TP3 are Corresponds to a plurality of trap points that are variable by the variable trap unit 240.

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

3 and 4, a mobile communication terminal of the present invention is a mobile phone such as a GSM phone, and the mobile communication terminal includes a communication transmission / reception module 100, using the communication transmission / reception module 100, and the like. Carry out telephony. In addition, such a mobile communication terminal includes a digital TV broadcast receiving module 200 and receives a digital TV broadcast such as DVB-H by using the digital TV broadcast receiving module 200.

Meanwhile, the mobile communication terminal of the present invention is a GSM phone using a frequency band of approximately 880 MHz to 915 MHz, and the digital TV broadcast receiving module 200 receives a DVB-H signal receiving a DVB-H signal using a frequency band of approximately 470 MHz to 702 MHz. The case of the H receiving module will be described.

The communication transmitting and receiving module 100 transmits and receives a phone call using a frequency band of approximately 880 MHz to 915 MHz. In this case, the communication transmitting and receiving module 100 transmits through an internal power amplifier PA. The signal (STX) is amplified to a fairly high power of approximately +33 dBm and transmitted through the communication antenna (ANT-C).

At this time, since the frequency (880 MHz to 915 MHz) of the transmission signal STX for the telephone call is close to the frequency band of the digital TV broadcast, and the transmission power of the transmission signal STX is considerably high, such transmission signal When (STX) is introduced into the digital TV broadcast receiving module 200, since the high power transmission signal STX interferes with the digital TV broadcast signal, the reception sensitivity of the digital TV broadcast receiving module 200 is achieved. Will fall.

However, even when the high power transmission signal STX is input to the digital TV broadcast receiving module 200, the digital TV broadcast receiving module 200 of the present invention accurately traps the high power transmission signal STX. Can be sufficiently attenuated below the level allowed by the specification of the GSM telephone, so that the high power transmission signal (STX) does not cause interference with the digital TV broadcast signal, and thus the digital TV in the mobile communication terminal of the present invention. The reception sensitivity of the broadcast signal is improved.

Specifically, in the digital TV broadcast receiving module 200 of the present invention, the broadcast signal passing filter 210 passes an RF signal through a broadcast receiving antenna ANT-B in a predetermined band.

At this time, the level detector 220 of the present invention detects the level of the RF signal passing through the broadcast signal passing filter 210, and outputs the detection level (Vd) to the trap controller 230. For example, when the transmission signal STX flows into the digital TV broadcast receiving module 200 and affects the digital broadcast signal SB, the signal level is increased by the high power transmission signal STX. The detection level Vd becomes larger than a certain level. In contrast, when the transmission signal STX does not affect the digital broadcast signal SB, the detection level Vd becomes lower than a predetermined level. Using this point, it is possible to determine the trapping degree of the transmission signal by the magnitude of the detection level.

The trap control unit 230 outputs a trap control voltage Vtc corresponding to the detection level Vd detected by the level detector 220 to the variable trap unit 240.

In detail, the trap control unit 230 compares the detection level Vd detected by the level detector 220 with a preset reference level Vref, and the detection level Vd is a reference value. When the level is greater than the level Vref, a trap control voltage Vtc is provided to the variable trap unit 240 for controlling the variation of the trap point TP within a preset variable trap frequency range VFR.

On the contrary, when the detection level Vd is not greater than the reference level Vref, the trap control unit 230 controls the variable trap trap control voltage Vtc to control the current trap point TP. Provided to the unit 240.

For example, when setting the variable trap frequency range (VFR) to approximately 880 MHz to 915 MHz frequency band, the trap control unit 230 monitors the detection level while varying the frequency in the variable trap frequency range to detect the detection. It is synchronized to the trap point where the level becomes lower than the reference level.

Next, the variable trap unit 240 varies the trap point TP according to the trap control voltage Vtc, and applies the trap point TP to the trap point TP in the frequency band that has passed through the broadcast signal pass filter 210. Trap the corresponding frequency. That is, the variable trap unit 240 tunes the trap point to the frequency of the GSM transmission signal in accordance with the trap control voltage Vtc, and precisely synchronizes the trap point to the incoming transmission signal STX to transmit the signal STX. ) Can be trapped correctly.

The present invention as described above, in the digital TV broadcast receiving module 200 of the present invention, by applying a variable trap unit to improve the transmission signal trap characteristics in the digital TV broadcast receiving module 200 to improve digital TV reception performance. Can be.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, but is defined by the claims, and the apparatus of the present invention may be substituted, modified, and modified in various ways without departing from the spirit of the present invention. It is apparent to those skilled in the art that modifications are possible.

According to the present invention as described above, in a mobile communication terminal such as a mobile phone, a PDA, a wireless telephone, a digital TV broadcast receiving module embedded in the mobile communication terminal, trap points in a transmission signal such as GSM By accurately adjusting the frequency of the signal, the high power transmission signal can be trapped accurately, thereby improving the reception sensitivity of digital TV broadcasting such as DVB-H.

Claims (14)

A broadcast signal passing filter connected to a broadcast receiving antenna for receiving a digital TV broadcast signal and passing an RF signal through the broadcast receiving antenna in a preset frequency band; A level detector detecting a level of the RF signal passing through the broadcast signal passing filter; A trap controller for outputting a trap control voltage according to the detection level detected by the level detector; And The variable trap part which changes a trap point according to the trap control voltage from the said trap control part, and traps the frequency corresponding to the said trap point among the frequency band which passed the said broadcast signal pass filter. Digital TV broadcast receiving module comprising a. The method of claim 1, wherein the digital TV broadcast receiving module, Digital TV broadcast receiving module characterized in that the DVB-H receiving module for receiving a DVB-H signal using a frequency band of 470MHz ~ 702MHz. The method of claim 1, wherein the digital TV broadcast receiving module, Digital TV broadcast receiving module, characterized in that applied to the GSM phone using a frequency band of 880MHz ~ 915MHz. The method of claim 1, wherein the trap control unit A trap control voltage for comparing the detection level detected by the level detecting unit with a preset reference level and controlling the variation of the trap point within a preset variable trap frequency range when the detection level is greater than the reference level Digital TV broadcasting receiving module, characterized in that for providing to the variable trap unit. The method of claim 4, wherein the trap control unit And if the detection level is not greater than a reference level, providing a trap control voltage to the variable trap unit for fixed control to a current trap point. The method of claim 5, wherein the trap control unit And the variable trap frequency range is set in a 880 MHz to 915 MHz frequency band. The method of claim 5, wherein the variable trap unit And a trap point tuned to a frequency of a GSM transmission signal in accordance with the trap control voltage. A communication transmission / reception module connected to a communication antenna and transmitting and receiving a mobile communication signal through the communication antenna; And A broadcast signal passing filter connected to a broadcast receiving antenna and configured to pass an RF signal through the broadcast receiving antenna in a predetermined band, a level detecting unit detecting a level of the RF signal passing through the broadcast signal passing filter, and the level; A trap control unit for outputting a trap control voltage according to the detection level detected by the detection unit, and a frequency corresponding to the trap point among the frequency bands in which the trap point is varied according to the trap control voltage and passed through the broadcast signal pass filter. Digital TV broadcast receiving module including a variable trap unit for trapping the A mobile communication terminal comprising a. The method of claim 8, wherein the digital TV broadcast receiving module A mobile communication terminal comprising a DVB-H receiving module for receiving a DVB-H signal using a frequency band of 470 MHz to 702 MHz. The method of claim 8, wherein the mobile communication terminal, Mobile communication terminal, characterized in that the GSM phone using a frequency band of 880MHz ~ 915MHz. The method of claim 8, wherein the trap control unit A trap control voltage for comparing the detection level detected by the level detecting unit with a preset reference level and controlling the variation of the trap point within a preset variable trap frequency range when the detection level is greater than the reference level Mobile communication terminal, characterized in that for providing to the variable trap unit. The method of claim 11, wherein the trap control unit And if the detection level is not greater than a reference level, providing a trap control voltage to the variable trap unit for fixed control to a current trap point. The method of claim 12, wherein the trap control unit Mobile variable terminal characterized in that the variable trap frequency range is set to the 880MHz ~ 915MHz frequency band. The method of claim 12, wherein the variable trap unit And a trap point tuned to a frequency of a GSM transmission signal in accordance with the trap control voltage.

Images