JP2010278940A - High frequency receiving part and mobile device employing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a transmission loss caused by pulling around an antenna and a tuner part, or a transmission loss caused by pulling around the tuner part and a demodulating part. <P>SOLUTION: A high frequency receiving part includes: a first tuner module 46 integrating a tuner part 43 to which an antenna 39 which can receive a television signal is connected and which selects a desired signal, and a demodulating part 45 for demodulating an output signal from the tuner part 43; and a second tuner module 60 for integrating at least a tuner part 57 to which an antenna 53 which can receive a television signal is connected and which selects a desired signal, and a demodulating part 59 for demodulating an output signal from the tuner part 57. The tuner parts 43 and 57 are respectively disposed in proximity to the antennas 39 and 53. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-frequency receiving unit that enables diversity reception and a portable device using the same.

  Hereinafter, the conventional high frequency receiver 1 will be described with reference to FIG. In FIG. 3, the high frequency receiving apparatus 1 includes tuner units 5 and 7 connected to antennas 3 and 4, demodulating units 8 and 13 to which outputs of the tuner units 5 and 7 are respectively connected, and the demodulating unit 8. , 13 to which the outputs of the diversity unit 9 are connected, error correction units 11 and 13 to which the outputs of the diversity unit 9 are respectively connected, and output terminals 15 to which the outputs of the error correction units 11 and 13 are connected. 17.

  The demodulated signal processing unit 19 includes demodulating units 8 and 13, a diversity unit 9, and error correcting units 11 and 13.

  About the high frequency receiver 1 comprised as mentioned above, the operation | movement is demonstrated below. Television broadcast signals input from the antennas 3 and 4 are supplied to the respective tuner units 5 and 7 to be controlled to a constant signal level and converted to a predetermined frequency. These converted signals are input to the demodulation units 8 and 13 and demodulated. The demodulated signals output from the demodulating units 8 and 13 are separately input to the diversity unit 9.

  In the diversity unit 9, a subcarrier signal constituting the digital signal is detected, and this subcarrier detection signal is supplied to the diversity control unit 21. When the subcarrier detection signal is good, the diversity control unit 21 performs single reception with one of the tuner units 5 and 7 operating, and when the subcarrier detection signal is bad, the tuner unit Both 5 and 7 are set to the operating state, and diversity reception is performed. Thereby, reception quality is ensured.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2001-156738 A

  In such a conventional high frequency receiving apparatus, the frequency at the tuner units 5 and 7 is much higher than the frequency of the demodulated signal processing unit 19. For this reason, the tuner units 5 and 7 use, for example, a bipolar process with a high processing speed, and the demodulated signal processing unit 19 uses, for example, a CMOS process with low current consumption.

  When these antennas 3 and 4, the tuner units 5 and 7, and the demodulated signal processing unit 19 are mounted on a miniaturized portable device, they are disposed apart from each other.

  For example, when the antenna 3 and the tuner unit 5 and the antenna 4 and the tuner unit 7 are arranged close to each other to reduce transmission loss due to routing, the tuner unit 5 and the demodulation unit 8 or the tuner unit 7 and the demodulation unit 13 are arranged. The connection part with the terminal becomes longer and the transmission loss due to routing increases.

  Further, for example, a signal having a frequency of about 560 KHz in one segment is transmitted from the tuner units 5 and 7 to the demodulation units 8 and 13. Or it jumped into the routing part of the tuner part 7 and the demodulation part 13, and became obstruction. For this reason, degradation of reception quality occurred.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to reduce transmission loss due to routing between an antenna and a tuner unit and transmission loss due to routing between a tuner unit and a demodulation unit.

  In order to achieve this object, the high-frequency receiving unit of the present invention includes at least a first tuner unit and a first tuner module that integrates the first demodulation unit, and at least a second tuner unit; A second tuner module for integrating the second demodulation unit is provided, and the first and second tuner units are arranged close to the first and second antennas, respectively.

  Thereby, the intended purpose can be achieved.

  As described above, the high-frequency receiving unit of the present invention includes at least the first tuner unit and the first tuner module that integrates the first demodulation unit, and at least the second tuner unit and the second tuner unit. A second tuner module for integrating the demodulation units is provided, and the first and second tuner units are arranged close to the first and second antennas, respectively.

  As a result, the transmission loss due to routing between the antenna and the tuner unit and the transmission loss due to routing between the tuner unit and the demodulation unit can be reduced, so that reception quality can be improved.

Block diagram of the high-frequency receiving device according to Embodiment 1 of the present invention Perspective view of portable equipment using high-frequency receiver Block diagram of a conventional high frequency receiver

(Embodiment 1)
FIG. 1 is a block diagram of a high-frequency receiving device 31 according to Embodiment 1 of the present invention. In FIG. 1, the high-frequency receiving device 31 includes a first high-frequency receiving unit 33 and a second high-frequency receiving unit 35. In addition, the high-frequency receiving device 31 can switch between single reception and diversity reception by the diversity control unit 37.

  A tuner unit 43 to which an antenna 39 is connected via an input terminal 41, a demodulator 45 to which the output of the tuner unit 43 is connected, and an output of the demodulator 45 are connected to the first high frequency receiver 33. A diversity unit 47 to be connected, an error correction unit 49 to which an output of the diversity unit 47 is connected, and an output terminal 51 to which an output of the error correction unit 49 is connected.

  The second high-frequency receiving unit 35 includes a tuner unit 57 to which an antenna 53 is connected via an input terminal 55, a demodulation unit 59 to which an output of the tuner unit 57 is connected, and an output of the demodulation unit 59. Are connected to each other, an error correction unit 63 to which the output of the diversity unit 61 is connected, and an output terminal 65 to which the output of the error correction unit 63 is connected.

  One tuner unit 43 is provided with a high frequency amplifier 71, a mixer 73, and an intermediate frequency filter 75 in order from the input terminal 67 to the output terminal 69. The output of the oscillator 74 is connected to the other input of the mixer 73.

  Further, the demodulator 45 is provided with an A / D converter 83, a demodulator 85, and an FFT (Fast Fourier Transform) 87 in order from the input terminal 79 to the output terminal 81.

  Further, the diversity unit 47 includes a subcarrier synthesizer 93 having an input terminal 89 connected to the input 93a and an output connected to the output terminal 91, and an input terminal 89 connected to the input 95b and an output 95d. A subcarrier detector 95 connected to the input 93b of the carrier synthesizer 93 is provided.

  A BER determination unit 99 is provided between the other output 49 a of the error correction unit 49 and the output terminal 97.

  The other tuner unit 57 is provided with a high frequency amplifier 105, a mixer 107, and an intermediate frequency filter 109 in order from the input terminal 101 to the output terminal 103. The output of the oscillator 108 is connected to the other input of the mixer 107.

  The demodulator 59 includes an A / D converter 117, a demodulator 119, and an FFT 121 in order from the input terminal 113 to the output terminal 115.

  Furthermore, the diversity unit 61 is provided with a subcarrier selector 127 in which the input terminal 123 is connected to the input 127 a and the output 127 b is connected to the output terminal 125.

  Further, a BER determination unit 131 is provided between the output 63 a of the error correction unit 63 and the output terminal 129.

  Further, the input terminal 123 is connected to the input 95 c of the subcarrier detector 95, and the output 95 e of the subcarrier detector 95 is connected to the input 37 a of the diversity controller 37.

  The output 37b of the diversity controller 37 is connected to the input 127c of the subcarrier selector 127, and the output 127d of the subcarrier selector 127 is connected to the input 93c of the subcarrier combiner 93.

  The operation of the high-frequency receiving device 31 configured as described above will be described with reference to FIG.

  Recently introduced digital broadcast signals have a reduced transmission output so as not to affect existing analog broadcast signals. For this reason, the reception sensitivity of the high frequency receiver 31 is important in the weak electric field area.

  Here, diversity reception means that the first high-frequency receiving unit 33 and the second high-frequency receiving unit 35 are operated, and the demodulated signals output from the demodulating units 45 and 59 are subcarrier combiners 93 of the diversity unit 47. Are combined and received.

  In the single reception, the first high-frequency receiving unit 33 is operated, the second high-frequency receiving unit 35 is deactivated, and the subcarrier synthesizer 93 uses only the demodulated signal from the demodulating unit 45. .

  The switching of signal processing according to diversity reception and single reception is performed when the BER (bit error rate) in the BER determiners 99 and 131 is equal to or higher than a certain standard, and when the BER (bit error rate) is equal to or smaller than a certain standard. You can choose to receive.

  Instead of the determination by BER, reception quality may be detected using the subcarrier detection signal C / N output from the output 95e of the diversity unit 47.

  First, diversity reception will be described. The power supply voltage from the output terminal 38 of the diversity controller 37 is supplied to the first high frequency receiver 33 and the second high frequency receiver 35. Then, the same channel selection data is transmitted to the tuner units 43 and 57, and the reception operation is started.

  Then, the television broadcast signal input from the antenna 39 is amplified by the high frequency amplifier 71 of the tuner unit 43 and supplied to one input of the mixer 73.

  An oscillation signal from an oscillator 74 is supplied to the other input of the mixer 73, and an intermediate frequency signal is output from the mixer 73. The intermediate frequency signal is suppressed by the intermediate frequency filter 75.

  This intermediate frequency signal is converted from an analog signal to a digital signal by the A / D converter 83. This digital signal is digitally demodulated by the demodulator 85. This digital demodulated signal is converted into a signal subjected to fast Fourier transform by the FFT 87 and output from the output terminal 81.

  Similarly, the television broadcast signal input from the antenna 53 is amplified by the high frequency amplifier 105 of the tuner unit 57 and supplied to one input of the mixer 107.

  An oscillation signal from an oscillator 108 is supplied to the other input of the mixer 107, and an intermediate frequency signal is output from the mixer 107. The intermediate frequency signal is suppressed by the intermediate frequency filter 109.

  This intermediate frequency signal is converted from an analog signal to a digital signal by the A / D converter 117. This digital signal is digitally demodulated by a demodulator 119. The digital demodulated signal is converted into a demodulated signal that has been subjected to fast Fourier transform by the FFT 121, and is output from the output terminal 115.

  The demodulated signals output from these output terminals 81 and 115 are input to input terminals 89 and 123 of diversity units 47 and 61, respectively.

  In the diversity unit 47, the subcarrier detector 95 detects the signal quality of subcarriers included in the two demodulated signals output from the demodulation units 45 and 59. Based on the detected signal quality information, a weighting coefficient for each subcarrier is calculated. This weighting coefficient is input from the output 95 d of the subcarrier detector 95 to the input 93 b of the subcarrier synthesizer 93.

  In this subcarrier synthesizer 93, a subcarrier synthesized signal synthesized by multiplying by the weighting coefficient is output from the output terminal 91. The signal synthesized in this way is improved C / N by a maximum of 2 times by the weighting coefficient.

  This subcarrier composite signal is input to the error correction unit 49. The error-corrected TS (transport stream) signal output from the error correction unit 49 is output from the output terminal 51.

  Since the TS signal can be an error-corrected signal with C / N improved by a maximum of 2 times, the reception quality is improved.

  Next, a case where diversity reception is changed to single reception under the control of the diversity control unit 37 will be described.

  In this single reception, for example, the first high-frequency receiving unit 33 will be described as operating and the second high-frequency receiving unit 35 will be described as non-operating.

  As a result, the demodulated signal from the demodulator 45 is input to the input terminal 89 of the diversity unit 47, and the demodulated signal from the demodulator 59 is not input to the input terminal 123 of the diversity unit 61.

  The demodulated signal output from the output terminal 91 of the diversity unit 47 is input to the error correction unit 49, and the error-corrected TS signal is output from the output terminal 51.

  In this way, the reception quality is determined using the BER (bit error rate) in the BER determiners 99 and 131 or the subcarrier detection signal C / N output from the subcarrier detector 95. Single reception is possible when the reception quality determination is above a certain standard, and diversity reception can be selected when the reception quality is below a certain standard.

  Although the first high-frequency receiving unit 33 is used at the time of single reception, when the diversity carrier 61 includes a subcarrier detector 62 (not shown), the second high-frequency receiving unit 35 is used at the time of single reception. May be.

  Here, what is important is that in the high-frequency receiving device 31 capable of diversity reception, the exchange of signals between the antennas 39 and 53, the tuner units 43 and 57, the demodulation units 45 and 59, the diversity units 47 and 61, and the mutual It is an arrangement relationship.

  FIG. 2 is a perspective view of the portable device 201 on which the high-frequency receiving device 31 is mounted. In FIG. 2, the portable device 201 includes a case 203 and a case 205 that can be opened and closed via an end face 202.

  A display unit 207 is provided on the open / close surface of the case 203, and the antennas 39 and 53, the first high frequency receiving unit 33, the second high frequency receiving unit 35, and the cellular phone antenna 209 are arranged in the case 205. ing.

  The antennas 39 and 53 are arranged apart from each other on the end face in the longitudinal direction of the case 205. This can improve the reception sensitivity at the time of diversity reception by arranging the antennas 39 and 53 as far apart as possible.

  Further, the first high-frequency receiving unit 33 is disposed in the vicinity of the feeding point 39 a of the antenna 39. Thereby, since the connection part of the feeding point 39a of the antenna 39 and the tuner part 43 can be shortened, the deterioration of the transmission loss by routing can be prevented.

  Similarly, the second high-frequency receiving unit 35 is disposed in the vicinity of the feeding point 53 a of the antenna 53. Thereby, since the connection part of the feeding point 53a of the antenna 53 and the tuner part 57 can be shortened, deterioration of transmission loss due to routing can be prevented.

  In particular, high-frequency signals from the antennas 39 and 53 have high frequencies, so transmission loss due to routing tends to increase. However, transmission loss due to routing between the antenna 39 and the tuner unit 43 or transmission due to routing between the antenna 53 and the tuner unit 57. Since loss can be reduced, it is possible to prevent deterioration of reception sensitivity.

  In addition, although the cellular phone antenna 209 is disposed in the vicinity of the antenna 53, the reception quality of the TV signal may deteriorate when the cellular phone is used. In order to prevent this, it is preferable to dispose the antenna 39 and the first high-frequency receiving unit 33 used for single reception away from the cellular phone antenna 209.

  Furthermore, since the intermediate frequency signal output from the tuner units 43 and 57 has a frequency of about 560 KHz for 1 segment reception and about 6 MHz for full segment reception, it is between the tuner unit 43 and the A / D converter 83 or the tuner unit. Between 57 and the A / D converter 117, transmission loss is likely to deteriorate due to routing.

  It is important that the A / D converters 83 and 117 have an upper limit voltage and a lower limit voltage that can be generally input in order to obtain good reception characteristics, and supply an optimum voltage.

  For this purpose, a tuner module 46 in which the tuner unit 43 and the demodulation unit 45 are integrated, a tuner module 60 in which the tuner unit 57 and the demodulation unit 59 are integrated, and a tuner instead of the first high-frequency receiving unit 33 in FIG. A module 46 may be provided, and a tuner module 60 may be provided in place of the second high-frequency receiving unit 35.

  As a result, the tuner unit 43 can be disposed close to the feeding point 39a of the antenna 39. Furthermore, the length of the connection part between the tuner part 43 and the demodulation part 45 can be made constant.

  Similarly, the tuner unit 57 can be disposed in the vicinity of the feeding point 53 a of the antenna 53. Furthermore, the length of the connection part between the tuner part 57 and the demodulation part 59 can be made constant.

  In the present embodiment, the portable device 201 has been described as having a shape that can be freely opened and closed. For example, the first case and the second case may be movable with respect to each other and may have shapes facing each other. It is the same.

  As described above, the first tuner module that integrates at least the first tuner section and the first demodulation section is provided, and at least the second tuner section and the second demodulation section are integrated. Two tuner modules can be provided, and the first and second tuner sections can be arranged close to the first and second antennas, respectively.

  As a result, the transmission loss due to routing between the antenna and the tuner unit and the transmission loss due to routing between the tuner unit and the demodulation unit can be reduced, so that reception quality can be improved.

  The main part of the first tuner unit and the main part of the first demodulation unit may be integrated, and at least the main part of the second tuner unit and the main part of the second demodulation unit may be integrated. . Thereby, transmission loss due to routing between the first tuner unit and the first demodulator unit, and between the second tuner unit and the second demodulator unit can be reduced.

  The main parts of the first and second tuner sections include at least a mixer and an oscillator, and the main sections of the first and second demodulation sections include at least an A / D converter, a demodulator, and an FFT. .

  The high-frequency receiving unit of the present invention can reduce transmission loss due to routing between the antenna and the tuner unit and transmission loss due to routing between the tuner unit and the demodulation unit, and thus can be applied to a portable device having a reduced size. .

33 High Frequency Receiver 35 High Frequency Receiver 41 Input Terminal 43 Tuner 45 Demodulator 46 Tuner Module 47 Diversity 49 Error Corrector 51 Output Terminal 55 Input Terminal
57 Tuner 59 Demodulator 60 Tuner Module 61 Diversity 63 Error Correction 65 Output Terminal

Claims (5)

First and second input terminals to which first and second antennas capable of receiving a TV signal are connected, and first and second input terminals to which the first and second input terminals are connected and a desired signal are selected, respectively. 2 tuner units, first and second demodulator units for demodulating the output signals of the first and second tuner units, and output signals of the first and second demodulator units are connected to each other, and diversity is provided. First and second error corrections that perform error correction while the outputs of the first and second diversity units that perform signal processing according to reception and single reception are connected to the outputs of the first and second diversity units, respectively. And first and second output terminals to which outputs of the first and second error correction units are connected, and at least the first tuner unit and the first demodulation unit are integrated. Providing a first tuner module, at least A second tuner module that integrates the second tuner section and the second demodulation section is provided, and the first and second tuner sections are arranged close to the first and second antennas, respectively. High frequency receiver. At least a first high-frequency receiving unit that integrates the first tuner unit, the first demodulation unit, and the first diversity unit is provided, and at least the second tuner unit and the second tuner unit are provided. And a second high-frequency receiving unit that integrates the second diversity unit, and the first diversity unit determines the quality of the first subcarrier input from the first demodulating unit. The high-frequency receiving unit according to claim 1, further comprising: a subcarrier detector for detecting; and a subcarrier synthesizer that synthesizes a subcarrier signal output from the second diversity unit based on a detection signal of the subcarrier detector. . At least the main part of the first tuner unit and the main part of the first demodulation unit are integrated, and at least the main part of the second tuner unit and the main part of the second demodulation unit are integrated. The high frequency receiver according to claim 1, which is integrated. 2. A portable device on which the high-frequency receiving unit according to claim 1 is mounted, wherein the first and second antennas are arranged apart from each other at a longitudinal end portion of a case constituting the portable device. A portable device in which the first and second input terminals of the first and second tuner units are arranged close to the feeding points of the first and second antennas, respectively. The portable device according to claim 4, wherein the portable phone antenna of the portable device is provided close to the second antenna.

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