Patent Publication Number: US-2007105513-A1

Title: Radio reception device for receiving both terrestrial and satellite digital broadcasting

Description:
CROSS-REFERENCE TO RELATED APPLICATION  
      This application claims priority from Korean Patent Application No. 10-2005-0107130 filed on Nov. 9, 2005 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.  
     BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      Apparatuses consistent with the present invention relate to a radio reception device and, more particularly, to a radio reception device for receiving both terrestrial and satellite digital broadcasting.  
      2. Description of the Related Art  
      As digital broadcasting technology and mobile communication technology are developed, interest in digital broadcasting service, which enables digital broadcasts to be watched even while moving, is increasing. There is particular interest in Digital Multimedia Broadcasting (DMB) service using mobile communication terminals. DMB refers to a broadcasting service that enables a user to watch various multimedia broadcast programs even while moving, using a personal mobile receiver or a vehicle receiver, with an installed omnidirectional reception antenna. A DMB communication method may be defined as a kind of digital radio communication service that enables the reception of high-quality images through a very high frequency band, currently used for analog TV broadcasting, even while moving. In this case, DMB is classified as Terrestrial DMB (T-DMB) or Satellite DMB (S-DMB) according to the method of transmitting and receiving radio waves.  
      T-DMB uses Eureka-147, that is, the standard for Europe digital audio broadcasting, as a fundamental specification standard,.and has characteristics in that three blocks are created through the division of one channel, and a plurality of video and audio channels is created for each block. S-DMB broadcasts radio waves from a satellite, which is outside the atmosphere, towards the intended area. In this case, when a terrestrial broadcasting center sends various pieces of multimedia content to the satellite through a satellite frequency band (a Ku-band of 12 to 13 GHz), the satellite spreads the content to terrestrial DMB reception terminals through an S-band (2.630 to 2.655 GHz) allocated to use for DMB. In the case where it is not easy to directly receive satellite signals, signals can be transmitted through the downward frequencies of the Ku-band from the satellite to a terrestrial relay, which is called a gap filler, and then further relayed from the gap filler to a subscriber&#39;s reception terminal through the S-band. In this case, a frequency of a 200 MHz band is used, and radio waves have a diffraction characteristic appropriate for long distance transmission.  
       FIG. 1  is a block diagram showing the construction of a related art T-DMB reception device. Referring to  FIG. 1 , when a Band III frequency signal in a frequency band from 174 to 240 MHz is input, the signal is received through an antenna and amplified by a first Low-Noise (LNA) amplifier  11 , the magnitude of the signal is amplified by a first Automatic Gain Control (AGC) amplifier  12 , the signal is passed through a first Band-Pass Filter (BPF)  13  and the specific resulting frequency is then input to a first mixer  14 . Meanwhile, a Local Oscillation (LO) frequency signal, generated by a first Phase Locked Loop (PLL) synthesizer  15  and a first Voltage Controlled Oscillator (VCO)  16 , is also input to the first mixer  14 . The first mixer  14  then down-converts the frequency of the received signal in proportion to the difference between two frequencies by mixing the first signal, which has passed through the BPF  13 , with the second signal, which is output by the first VCO  16 , resulting in a locked Intermediate Frequency (IF) signal. The IF signal is passed through a second BPF  23  and then input into a second mixer  24 . Next, the input signal is mixed with an LO frequency signal, generated by a second PLL synthesizer  27  and a second VCO  28 , with the result being a down-converted signal. The down-converted signal is output via a third AGC amplifier  25  and a third BPF  26 . Furthermore, when an L-Band frequency signal, in a band from 1450 to 1492 MHz, is input to another reception antenna, the input frequency signal passes through a second LNA  21 , a second AGC amplifier  22  and the second BPF  23 , and is input to the second mixer  24 . The signal input to the second mixer  24  is output via the same path as the signal that is output from the first mixer  14 .  
       FIG. 2  is a block diagram showing the construction of a related art S-DMB reception device. Referring to  FIG. 2 , when an input frequency signal in a band from  2605  to 2655 MHz is input, the input frequency signal is amplified through an LNA  31 , the magnitude of the signal is automatically controlled by a Radio Frequency (RF) AGC amplifier  32  and then the signal is input to a mixer  33 . An LO frequency signal, which is generated by a PLL synthesizer  36  and a VCO  37 , is input to the mixer  33 . The mixer  33  down-converts the frequency of the two input signals in proportion to a difference between two frequencies by mixing a signal, which has passed through the RF AGC  32 , with a signal, which is output from the VCO  37 , therefore outputting a down-converted signal. The signal output by the mixer  33  is output via an analog processing unit, made up of the Baseband (BB) AGC amplifier  34  and a low pass filter (LPF)  35 .  
      However, in accordance with the conventional technology described above, the S-DMB reception device and the T-DMB reception device are separately used as devices for each type of communication, so that a problem occurs because both types of broadcasting services cannot be simultaneously received using a single reception device Integrated Circuit (IC). If two reception ICs corresponding to the respective communication methods must be provided in a single reception device to solve the problem, the cost and size of a product increase, therefore a problem occurs in that applicability to mobile communication devices is limited.  
     SUMMARY OF THE INVENTION  
      Exemplary embodiments of the present invention overcome the above disadvantages and other disadvantages not described above. Also, the present invention is not required to overcome the disadvantages described above, and an exemplary embodiment of the present invention may not overcome any of the problems described above.  
      The present invention provides a radio reception device, which integrates radio communication schemes, having different bands, particularly, RF reception devices based on T-DMB and S-DMB standards, into a single chip, thus enabling reception of both terrestrial and satellite digital broadcasting.  
      According to an aspect of the present invention, there is provided a radio reception device for receiving both a first input frequency signal based on a first radio communication method and a second input frequency signal based on a second radio communication method. The radio reception device includes: a reception device for a first radio communication method, the reception device having a first reception unit receiving and amplifying the first input frequency signal; a Local Oscillation (LO) signal generation unit generating an LO frequency signal locked to a single frequency value; a first mixing unit outputting a frequency down-converted signal by mixing the first input frequency signal, which is amplified by the first reception unit, with the LO frequency signal, which is generated by the LO signal generation unit; and a signal processing unit receiving the signal output from the first mixing unit and performing signal processing. The radio reception device further includes a reception device for a second radio communication method, the reception device having a second reception unit receiving and amplifying the second input frequency signal; a frequency divider dividing the signal, which is generated by the LO signal generation unit, at a predetermined division ratio; and a second mixing unit outputting a frequency down-converted signal by mixing the second input frequency signal, which is amplified by the second reception unit, with a signal resulting from the division of the frequency divider, and inputting the frequency down-converted signal to the signal processing unit. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The above and other aspects of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:  
       FIG. 1  is a block diagram showing the construction of a related art T-DMB reception device;  
       FIG. 2  is a block diagram showing the construction of a related art S-DMB reception device;  
       FIG. 3  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a first exemplary embodiment of the present invention;  
       FIG. 4  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a second exemplary embodiment of the present invention;  
       FIG. 5  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a third exemplary embodiment of the present invention;  
       FIG. 6  is a block diagram showing the construction of a radio reception device for receiving terrestrial and satellite digital broadcasting according to a fourth exemplary embodiment of the present invention;  
       FIG. 7  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a fifth exemplary embodiment of the present invention;  
       FIG. 8  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a sixth exemplary embodiment of the present invention; and  
       FIG. 9  is a diagram showing the comparisons of the schemes according to the first to sixth exemplary embodiments of the present invention. 
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE INVENTION  
      The advantages and characteristics of the present invention, and the method of achieving them, will be apparent with reference to exemplary embodiments described in detail later in conjunction with the accompanying drawings. However, the present invention is not limited to the exemplary embodiments disclosed below, but may be implemented in various ways. Furthermore, the exemplary embodiments are provided to complete the disclosure of the present invention, and to fully notify those skilled in the art of the scope of the present invention. The present invention is defined only by the appended claims. The same reference numerals are used throughout the different drawings to designate the same or similar components.  
      Exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings below.  
       FIG. 3  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a first exemplary embodiment of the present invention.  
      Referring to  FIG. 3 , the radio reception device is implemented in such a manner that a reception device for a first radio communication method and a reception device for a second radio communication method are integrated in a single chip. The reception device for a first radio communication method includes a first reception unit  100  which receives and amplifies a first input frequency signal, an LO signal generation unit  120  which generates an LO frequency signal locked to a single magnitude frequency, a first mixing unit  105  which outputs a frequency down-converted signal by mixing the first input frequency signal, which is amplified by the first reception unit  100 , with the LO frequency signal, which is generated by the LO signal generation unit  120 , and a signal processing unit  110  which receives the signal output from the first mixing unit  105  and performs signal processing.  
      The reception device for a second radio communication method includes a second reception unit  200  which receives and amplifies a second input frequency signal, a frequency divider  204  which divides the signal generated by the LO signal generation unit  120 , at a predetermined division ratio, and a second mixing unit  205  which outputs a frequency down-converted signal by mixing the second input frequency signal, which is amplified by the second reception unit  200 , with a signal which results from the division by the frequency divider  204 , and inputs the frequency down-converted signal to the signal processing unit  110 .  
      Although in the exemplary embodiment of the present invention, a description of the case where the first radio communication method is an S-DMB communication method and the second radio communication method is a T-DMB communication method is given by way of example, the scope of the present invention is not limited only thereto.  
      The reception device for an S-DMB communication method, which is indicated by gray blocks in the lower portion of  FIG. 3 , is described below. The reception device for an S-DMB communication method includes the first reception unit  100 , the LO signal generation unit  120 , the first mixing unit  105 , and the signal processing unit  110 . The first reception unit  100  includes a first LNA  101 , which amplifies the first input frequency signal received in a frequency band from 2605 to 2655 MHz, and a first AGC amplifier  102 , which automatically controls the magnitude of a signal that is amplified and output by the first LNA  101  and outputs the controlled signal to the first mixing unit  105 . The LO signal generation unit  120  generates the LO frequency signal, and includes a VCO  104  and a PLL synthesizer  103 . The VCO  104  generates the LO frequency signal and output the generated LO frequency signal to the first mixing unit  105 . The VCO could also output the generated LO frequency signal to a ½ or 1/14 divider  204 A or  204 B, that is, a frequency divider provided in the Reception device for a T-DMB method, which will be described later. The PLL synthesizer  103  provides the control voltage for controlling the VCO  104 . Generally, a PLL is a circuit that makes the phase of an input signal the same as that of an output signal by detecting the phase difference between the input signal and the output signal and controlling the phase of an output signal generator using voltage in proportion to the phase difference, and a PLL synthesizer includes a phase comparator, a low-pass filter, an error amplifier, and a VCO. In the present embodiment, the VCO  104  is illustrated as being separate from the PLL synthesizer  103 .  
      The first mixing unit  105  outputs the frequency down-converted signal by mixing the first input frequency signal (2605˜2655 MHz), which is amplified by the first AGC amplifier  102 , with the LO frequency signal, which is generated by the VCO  104 . The resulting down-converted signal is input to the signal processing unit  110  and undergoes analog signal processing. The signal processing unit  110  includes a Base band (BB) AGC amplifier  111  and a first BPF  112 . In this case, the BB AGC amplifier  111  functions to receive a signal, which is output from the first mixing unit  105  or from a second-first mixing unit  205 A or a second-second mixing unit  205 B the second mixing unit  205 , and automatically adjust the magnitude of the received signal within a BB frequency range. The first BPF  112  filters the signal controlled by the BB AGC amplifier  111  and, thereby, output a signal in a specific band. Furthermore, as shown in  FIG. 3 , the first BPF  112  may selectively use an LPF or a BPF according to the frequency range of the signal output from the mixing unit.  
      The reception device for a T-DMB method, which is indicated by white blocks in the upper portion of  FIG. 3 , is described below. The second reception unit  200  is divided into a second-first reception unit  200 A, which receives an L-band frequency signal and a second-second reception unit  200 B, which receives a band-III frequency signal. The second-first reception unit  200 A and the second-second reception unit  200 B are controlled so as to respectively receive the L-band frequency signal and the band-III frequency signal. In this case, the L-band frequency signal occupies a band from 1450 to 1492 MHz, and the band-III frequency signal occupies a band from 174 to 240 MHz.  
      A description of the detailed construction of the second-first reception unit  200 A is given below. The second-first reception unit  200 A includes a second-first LNA  201 A, a second-first AGC amplifier  202 A, and a second-first BPF  203 A. The second-first LNA  201 A amplifies the received L-band frequency signal. The second-first AGC amplifier  202 A automatically controls the magnitude of the signal amplified and output by the second-first LNA  201 A, and outputs the controlled signal. The second-first BPF  203 A extracts a signal within a specific frequency band by filtering the signal output from the second-first AGC amplifier  202 A, and outputs the extracted signal to a second-first mixing unit  205 A, which will be described later.  
      A detailed description of the second-second reception unit  200 B is given below. The second-second reception unit  200 B includes a second-second LNA  201 B, a second-second AGC amplifier  202 B, and a second-second BPF  203 B. The second-second LNA  201 B functions to amplify the received band-III frequency signal. The second-second AGC amplifier  202 B automatically controls the magnitude of the signal amplified and output by the second-second LNA  201 B, and outputs two controlled signal. The second-second BPF  203 B extracts a signal within a specific frequency band by filtering the signal output from the second-second AGC amplifier  202 B, and then outputs the extracted signal to a second-second mixing unit  205 B, which will be described later.  
      The second mixing unit  205  includes the second-first mixing unit  205 A and the second-second mixing unit  205 B perform up-conversion or down-conversion by mixing two types of signals. In order to input signals to the mixers, frequency dividers are used. When an L-band frequency signal (1450˜1492 MHz) is input to the second-first mixing unit  205 A through the second-first reception unit  200 A, the signal output from the ½ divider  204 A is input to the second-first mixing unit  205 A. When the frequency signal of the band-III (174˜240 MHz) is input to the second-second mixing unit  205 B through the second-second reception unit  200 B, a signal output from the 1/14 divider  204 B is input to the second-second mixing unit  205 B.  
      The frequency signal output from the VCO  104  falls within a band from 2436 to 3360 MHz, so that a frequency signal that falls within a band broader than the L-band from 1450 to 1492 MHZ must be supplied to the second-first mixing unit  205 A to cover L-band frequency signals (1450˜1492 MHz). For this reason, a ½ divider  204 A is used. When the ½ divider  204 A is used, a frequency signal in a band from 2436 to 3360 MHz is divided in half and, therefore, is converted into a signal in a band from 1218 to 1680 MHz band. In the same manner, in order to cover a band-III frequency signal (174˜240 MHz), a frequency signal that falls within a band broader than a band from 174 to 240 MHz must be supplied to the second-second mixing unit  205 B. Accordingly, when the 1/14 divider  204 B, which divides a frequency signal in a band from 2436 to 3360 MHz by 14, is used, the frequency signal is converted into a signal in a band from 174 to 240 MHz and is then supplied to the second-second mixing unit  205 B.  
      A description of the second-first mixing unit  205 A and the second-second mixing unit  205 B constituting the second mixing unit  205  is given below. The second-first mixing unit  205 A functions to perform down-conversion by mixing a signal obtained by filtering the second-first BPF  203 A of the second-first reception unit  200 A with a signal resulting from division by the ½ divider  204 A and to output a down-converted signal to the BB AGC amplifier  111  of the signal processing unit  110  of the reception device for an S-DMB method. In the same manner, the second-second mixing unit  205 B functions to perform down-conversion by mixing a signal obtained by the filtering of the second-second BPF  203 B of the second-second reception unit  200 B with a signal obtained by the division of the 1/14 divider  204 B and to output a down-converted signal to the BB AGC amplifier  111  of the reception device for an S-DMB method.  
      As described above, the frequency signal obtained by the T-DMB reception device of the upper portion of  FIG. 3  can be processed by the S-DMB signal processing unit  110  of the lower portion of  FIG. 3 , thus the two types of DMB methods can be used.  
      Hereinafter, schemes for receiving both T-DMB and S-DMB signals according to other exemplary embodiments of the present invention are described.  
       FIG. 4  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a second exemplary embodiment of the present invention. From  FIG. 4 , it can be seen that the second exemplary embodiment of  FIG. 4  uses the same components as those of the first exemplary embodiment of  FIG. 3 , except that frequency dividers  204 A and  204 B are provided as part of the PLL synthesizer  103  of the Reception device for an S-DMB method. That is, with reference to  FIG. 4 , the ½ divider  204 A and the 1/14 divider  204 B are provided in the PLL synthesizer  103  of the reception device for an S-DMB method. Respective signals obtained by the division of the ½ divider  204 A and the 1/14 divider  204 B are buffered and then input to the second-first mixing unit  205 A and the second-second mixing unit  205 B, respectively. The buffers  210 A and  210 B pump the respective signals, which are obtained by the division, into the second-first mixing unit  205 A and the second-second mixing unit  205 B, and are responsible for buffering to adjust input velocity.  
       FIG. 5  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a third exemplary embodiment of the present invention. The third exemplary embodiment of  FIG. 5  differs from the first exemplary embodiment of  FIG. 3  in that a second-second reception unit  200 B can receive a band-I frequency signal (47˜68 MHz) and a band-II frequency signal (70˜108 MHz) as well as a band-II frequency signal (174˜240 MHz). That is, the second-second LNA  201 B of the reception device for a T-DMB method can receive and amplify both the band-I and band-II frequency signals. In the case where the band-I and band-II signals are received, even though the band-III frequency signal (174˜240 MHz) is processed and output through the same path as that of the first embodiment, the band-I and band-II signals are amplified by the second-second LNA  201 B, are input to a second-first AGC amplifier  202 A via a second-third mixing unit  205   c,  and are then processed therein. Band-I frequencies (47˜68 MHz) and band-II frequencies (70˜108 MHz) are low such that it is necessary to perform up-conversion thereon by inputting the signals to the second-third mixing unit  205 C. That is, the second-third mixing unit  205 C up-converts the input signals by mixing the signal from the second-second LNA  201 B, with an LO frequency signal, which is generated by a second VCO  220 . Next, the second-third mixing unit  205 C inputs the up-converted signal to the second-first AGC  202 A. From  FIG. 5 , it can be seen that, as a result of the up-conversion performed by the second-third mixing unit  205 C, the band-I frequency signal (47˜68 MHz) is up-converted by 1000 MHz to become a frequency signal falling within a band from 1447 to 1468 MHz, and the band-II frequency signal (70˜108 MHz) is up-converted by 1000 MHz to become a frequency signal falling within a band from 1470 to 1508 MHz. Furthermore, the frequency signals are up-converted as described above, so that the resonant rate (bandwidth/central frequency) can be reduced, thereby improving the performance of the VCOs used for frequency selection. Meanwhile, subsequent processes are the same as described in the first embodiment.  
       FIG. 6  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a fourth exemplary embodiment of the present invention. From  FIG. 6 , it can be seen that the fourth exemplary embodiment uses the sane components as those of the third exemplary embodiment of  FIG. 5 , except that frequency dividers  204 A and  204 B are provided in the PLL synthesizer  103  of a reception device for an S-DMB method. That is, with reference to  FIG. 6 , the ½ and 1/14 dividers  204 A and  204 B, respectively, are provided as part of the PLL synthesizer  103  of the reception device for the S-DMB method. Signals obtained the ½ and 1/14 dividers  204 A and  204 B are buffered and then input to a second-first mixing unit  205 A and a second-second mixing unit  205 B, respectively. Similar to the second exemplary embodiment, the buffers  210 A and  210 B pump the respective signals obtained by the division, into the second-first mixing unit  205 A and the second-second mixing unit  205 B, and are responsible for buffering to adjust input velocity.  
      In the third and fourth exemplary embodiments, the VCO  104 , which already exists in the reception device for an S-DMB method, is designated as, for the purpose of convenience, a first VCO  104  so as to differentiate it from the second VCO  220  of the reception device for a T-DMB method that generates the LO frequency signal and inputs the generated signal to the second-third mixing unit  205 C.  
       FIG. 7  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a fifth exemplary embodiment of the present invention. The fifth exemplary embodiment of  FIG. 7  is similar to the third or fourth exemplary embodiment in that a second-second LNA  201 B can receive both the band-I and band-II frequency signals (47˜68 MHz, 70˜108 MHz) as well as the band-III frequency signal (174˜240 MHz), but differs in that the band-III frequency signals (174˜240 MHz) are transferred to a second-first reception unit  200 A that processes L-band signals, are up-converted, and are then processed therein. Furthermore, it can be seen that a ½ divider  204 A, which performs division by 2, is used as a single frequency divider.  
      In the fifth exemplary embodiment, the second reception unit  200  is also divided into a second-first reception unit  200 A, which can receive the L-band signals, and a second-second reception unit  200 B, which can receive all of the band-I, II and III frequency signals. The second-first reception unit  200 A includes a second-first LNA  201  A which amplifies the received L-band frequency signal, a second-first AGC amplifier  202 A which automatically controls the magnitude of a signal amplified and output by the second-first LNA  201 A and outputs a controlled signal, and a second-first BPF  203 A which extracts a signal within a specific frequency band by filtering the signal output from the second-first AGC amplifier  203 A, and inputs the extracted signal to a second-first mixing unit  205 A.  
      The second-second reception unit  200 B includes a second-second LNA  201 B, which receives and amplifies the band-I, band-II or band-III frequency signal, a second VCO  220 , which generates the LO frequency signal, a second-second mixing unit  205 B, which inputs an up-converted signal to the second-first AGC  202 A by mixing the signal, which is amplified by the second-second LNA  201 B, with the LO frequency signal, which is generated by the second VCO  220 . In this case, it can be seen that band-I, band-II and band-III frequency signals are up-converted by 1260 MHz by the second-second mixing unit  205 B. Furthermore, it can be seen that the resonant rate (bandwidth/central frequency) decreases as the frequency signals are up-converted as described above.  
      Furthermore, the frequency divider of the fifth exemplary embodiment employs a ½ divider  204 A that divides in half the frequency magnitude of the signal generated by the LO signal generation unit  120 , and inputs the signal obtained by the division to the second-first mixing unit  205 A. Similar to the exemplary embodiment shown in  FIG. 5 , the LO signal generation unit  120  includes a first VCO  104 , which generates an LO frequency signal and outputs the generated signal to a first mixing unit  105  or the ½ divider  204 A, and a PLL synthesizer  103 , which outputs control voltage for controlling the first VCO  104 .  
       FIG. 8  is a block diagram showing the construction of a radio reception device for receiving both terrestrial and satellite digital broadcasting according to a sixth exemplary embodiment of the present invention. From  FIG. 8 , it can be seen that the sixth exemplary embodiment of  FIG. 8  uses the same components as those of the fifth exemplary embodiment of  FIG. 7 , except that a frequency divider  204 A is provided in the PLL synthesizer  103  of a reception device for an S-DMB method. The signal obtained by the division of the ½ divider  204 A is buffered and then input to a second-first mixing unit  205 A. Subsequent processes are the same as described above.  
      Meanwhile,  FIG. 9  is a diagram showing the comparisons of the schemes according to the first to sixth exemplary embodiments of the present invention. From  FIG. 9 , it can be seen that in the first and second exemplary embodiments the reception device for a T-DMB method receives and processes only band-III and L-band frequency signals, and a single oscillator is used, and in the third to sixth exemplary embodiments the reception device for a T-DMB method receives and processes all band signals, including band-I and band-II frequency signals, and a total of two oscillators are used, as an additional oscillator is used for the T-DMB method reception device. Furthermore, frequency selectivity increases in proportion to the decrease in the resonant rate, that is, the value obtained by dividing bandwidth by a central frequency. Accordingly, it can be seen that the first to fourth embodiments have a resonant rate of 31.8%, and the fifth and sixth exemplary embodiments have a resonant rate of 14%, which is lower than that of the first to fourth exemplary embodiments.  
      The term “unit,” as used herein, includes, but is not limited to, a software or hardware component, such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), which performs certain tasks. A module may advantageously be configured to reside on the addressable storage medium and be configured to be executed on one or more processors. Thus, a module may include, by way of example, components, such as software components, object-oriented software components, class components and task components, processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables, among others. The functionality provided for in the components and modules may be combined into fewer components and modules or may be further separated into additional components and modules. Furthermore, the components and modules may be implemented to operate on one or more Central Processing Units (CPUs) residing in a device or a security multimedia card.  
      In accordance with the exemplary embodiments of the present invention for a radio reception device for both terrestrial and satellite digital broadcasting, broadcasting services based on terrestrial DMB and satellite DMB standards can both be received using a single reception device.  
      Effects of the present invention are not limited to the above-described effects, and other effects that are not described may be understood by those skilled in the art from the accompanying claims.  
      Although the exemplary embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.