JP2009188783A - Receiving system, receiver, and relay cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiving system, a receiver and a relay cable wherein, for example, a digital radio broadcasting, etc. is applied to a receivable cellphone to effectively evade an increase in size of the device, an increase of its weight and a reduction of a receiving sensitivity without using electronic parts having a low versatility, thereby receiving a plurality of broadcasting waves. <P>SOLUTION: The relay cable 12 is composed of a coaxial line using a multiconductor coaxial cable 20, and cable cores LG, LL, LR are individually connected to antenna input ends of tuners 28, 29, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a receiving system, a receiving device, and a relay cable, and can be applied to, for example, a mobile phone capable of receiving digital radio broadcasts. The present invention configures a relay cable by a coaxial line using a multi-core coaxial cable, and connects the core cables individually to the antenna input end of the tuner, thereby eliminating the need for using electronic components with low versatility. It is possible to effectively avoid the increase in size, increase in weight, and decrease in reception sensitivity so that a plurality of broadcast waves can be received.

  Conventionally, mobile phones that can receive television broadcasts or the like receive broadcast waves with a built-in antenna or an external antenna. Here, the built-in antenna has an advantage that the design of the mobile phone is not impaired. However, the built-in antenna has disadvantages such as inferior sensitivity to an external antenna and being easily affected by internal noise.

  In contrast, external antennas include a rod antenna, an earphone antenna, and the like. Here, the rod antenna has an advantage that sensitivity and the like are superior to those of the built-in antenna. However, the rod antenna has a drawback in that the design of the mobile phone is damaged and the antenna protrudes. On the other hand, the earphone antenna uses an earphone cable as an antenna as disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-104591. The earphone antenna can prevent the deterioration of sensitivity and the influence of internal noise without impairing the design of the mobile phone.

  By the way, some mobile phones of this type have a plurality of tuners and receive a plurality of broadcast waves. In the case of having a plurality of tuners as described above, ideally, it is desirable to provide an antenna for each tuner.

  However, if an antenna is provided for each tuner, the shape of the mobile phone becomes larger and the weight may increase. Therefore, in the conventional cellular phone, as shown in FIG. 35, the connection of the antenna 2 is switched by the switch circuit 1 and the plurality of tuners 3 and 4 share one antenna 2. Here, the tuners 3 and 4 are, for example, television tuners and digital radio broadcast tuners. Further, the switch circuit 1 is constituted by a semiconductor switch having excellent high frequency characteristics, for example.

  However, when the antenna connection is switched by the switch circuit and one antenna is commonly used by a plurality of tuners, loss of the high frequency signal by the switch circuit is inevitable. Therefore, there is a problem that the reception sensitivity is degraded. A method of compensating for the loss caused by the switch circuit by providing an amplifier circuit is also conceivable, but this method complicates the overall configuration.

In addition, when switching antenna connections with a switch circuit and using one antenna with a plurality of tuners, it is necessary to configure the switch circuit using a semiconductor having excellent high-frequency characteristics, and the versatility is low. There are also problems that require the use of electronic components.
Japanese Patent Laid-Open No. 2007-104591

  The present invention has been made in consideration of the above points, and effectively avoids the increase in size, weight, and reduction in reception sensitivity of a plurality of broadcast waves without using electronic components with low versatility. It is intended to propose a receiving system, a receiving apparatus, and a relay cable that can receive the signal.

  In order to solve the above-mentioned problem, the invention of claim 1 is a reception device that receives a desired broadcast wave by a plurality of built-in tuners, and a transmission cable that transmits a signal and / or power of the reception device via a relay cable. The transmission cable is a plurality of cables, and the relay cable is a multi-core coaxial cable in which a plurality of core wire cables are surrounded by a covering wire, and the transmission cable side of the covering wire An end is an open end, the transmission cable side end of the core cable is connected to one of the corresponding cables, and the reception device is connected to the reception device side end of the covered wire, Grounding is performed, and the receiving device side end of the core cable is connected to the antenna input ends of the corresponding tuners.

  The invention of claim 3 is applied to a receiving device that receives a desired broadcast wave by a plurality of built-in tuners, and sends a signal and / or power to a transmission cable via a relay cable, or via a relay cable. Electric power is input from a transmission cable, the transmission cable is a plurality of cables, the relay cable is a multi-core coaxial cable in which a plurality of core cables are surrounded by a covered wire, and the end of the covered wire on the transmission cable side Is an open end, the transmission cable side end of the core cable is connected to one of the corresponding cables, and the reception device grounds the reception device side end of the covered wire. Then, the receiving device side end of the core cable is connected to the antenna input ends of the corresponding tuners.

  Further, the invention according to claim 7 is a relay cable in which one end is connected to a receiving device having a plurality of tuners via a connector, and the signal and / or power of the receiving device is relayed to a transmission cable connected to the other end. The transmission cable is a plurality of cables, a multi-core coaxial cable in which a plurality of core cables are surrounded by a coated wire, the other end of the coated wire is an open end, and the core cable The other end of each of the plurality of cables is connected to one of the corresponding plurality of cables, the one end of the covered wire and the one end of the core cable are respectively connected to terminals of the corresponding connector, The one end of the covered wire is grounded by the receiving device, and the one end of the core cable is respectively connected to the antenna input end of the plurality of tuners It is connected.

  According to the configuration of claim 1, claim 3, or claim 7, the relay cable functions as a coaxial transmission line, and a high frequency signal received by each transmission cable is provided to a corresponding tuner without providing a switch circuit or the like. Each can be entered. Therefore, high-frequency signals received by individual transmission cables can be input to individual tuners without using parts with low versatility, effectively avoiding increase in size, weight, and reduction in reception sensitivity. Multiple broadcast waves can be received.

  According to the present invention, it is possible to receive a plurality of broadcast waves while effectively avoiding an increase in size, an increase in weight, and a decrease in reception sensitivity without using electronic components with low versatility.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

(1) Configuration of Embodiment FIG. 2 is a perspective view showing a mobile phone system according to Embodiment 1 of the present invention. The mobile phone system 11 receives a plurality of broadcast waves by an earphone antenna. For this reason, in the mobile phone system 11, the earphone 13 is connected to the mobile phone 14 via the relay cable 12.

  Here, in the earphone 13, a plug 17 is connected to one end of a cable 16, and right and left channel speakers 18 </ b> R and 18 </ b> L are connected to the other end of the cable 16. The relay cable 12 is provided with a jack 21 for connecting the plug 17 of the earphone 13 at one end of the cable 20 and a plug 22 at the other end of the cable 20. The mobile phone 14 is provided with a jack 23 for connecting the plug 22.

  Here, as shown in FIG. 1, the earphone 13 has a parallel two-wire cable extending from the right channel and left channel speakers 18R and 18L, respectively, so that the right and left channel audio signals share a common ground. The three-wire flat cable is connected to the terminals 17G, 17L, and 17R of the plug 17. The earphone 13 is formed so that the cable on the left channel side is longer than the cable on the right channel side.

  The cable 20 of the relay cable 12 is a multi-core coaxial cable, and is formed by surrounding the three core wire cables LL, LR, and LG with a covered wire SS made of a network wire. In the cable 20, the three core cables LL, LR, and LG are connected to corresponding terminals 21L, 21R, and 21G of the jack 21, respectively. The three core cables are connected to the hot side and the right side of the left channel audio signal, respectively. The hot side of the channel audio signal is assigned to the common ground for the right channel audio signal and the left channel audio signal. The covered wire SS is not connected to the earphone 13 and the jack 21 side end is an open end.

  The cable 20 is connected to the plug 22 via the wiring board 24 disposed on the back surface of the plug 22, and the core cables LL, LR, LG and the covered wire SS are individually connected to the mobile phone 14. For this reason, the plug 22 is provided with a plurality of terminals so that the core cables LL, LR, LG and the covered wire SS can be individually connected to the mobile phone 14. More specifically, in this embodiment, the plug 22 is provided with a 10-pin terminal. In FIG. 1, the 10-pin terminals are indicated by numerals 1 to 10.

  That is, the cable 20 is connected to the fourth and fifth terminals 4 and 5 of the plug 22 by the core cables LL and LR to which the hot side of the left channel audio signal and the hot side of the right channel audio signal are respectively assigned. Further, the cable 20 is connected to the first terminal 1 of the plug 22 by the core wire LG assigned to the ground. Further, the cable 20 has a covered wire SS connected to the tenth terminal 10. In the cable 20, the covered wire SS is further connected to the third and sixth terminals 3 and 6. Here, the third and sixth terminals 3 and 6 are connection detection terminals for detecting the connection of the relay cable 12 by the mobile phone 14. In the mobile phone 14, the third and sixth terminals 3 and 6 are connected. The connection of the relay cable 12 is detected by determining whether or not the terminal of the corresponding jack 23 is connected to the ground.

  The cable 20 is connected to a core wire cable LG and a covered wire SS assigned to the ground by a high-frequency cutoff circuit 25 disposed on the wiring board 24, whereby the core wire cable LG and the covered wire SS are insulated in terms of high frequency. In this state, the core cable LG and the covered wire SS are set to the same potential in terms of DC. Here, the high-frequency cutoff circuit 25 is constituted by a chip inductor, for example. In this embodiment, the core cables LL, LR and LG are held in the relay cable 12 in a state where they are insulated from each other in both direct current and alternating current, but as the earphone antenna, the frequency band of each broadcast wave is used. When sufficient characteristics can be ensured with the above, or when the characteristics as an earphone antenna are insufficient, the plug 22 side ends may be connected by capacitors C1 and C2, as shown by the broken line in FIG. .

  The mobile phone 14 is a mobile phone having a function of receiving FM broadcasts and television broadcasts. The cellular phone 14 is provided with a low band tuner 28 and a high band tuner 29, and right and left channel audio signals SAR and SAL are output from the low band tuner 28 and the high band tuner 29. Here, the low band tuner 28 is a tuner that receives a low band of FM broadcast and television broadcast. The high band tuner 29 is a tuner that receives a high band of television broadcasting. The cellular phone 14 amplifies the right channel and left channel audio signals SAR and SAL by the amplification circuits 30R and 30L, respectively, and then inputs the amplified signals to the built-in speaker 32 via the switching circuit 31.

  In addition, when the relay cable 12 is connected, the mobile phone 14 switches the operation of the switching circuit 31 by the controller 33, stops outputting the audio signals SAR and SAL to the built-in speaker 32, and outputs the audio signals SAR and SAL. Output to the relay cable 12.

  Here, for the left channel audio signal SAL, the mobile phone 14 converts the audio signal SAL output from the switching circuit 31 to the jack 23 via the high-frequency cutoff circuit 35L that prevents the high-frequency signal from entering the relay cable 12. Output to the corresponding terminal. On the other hand, for the right-channel audio signal SAR, the audio signal output from the switching circuit 31 is output to the corresponding terminal of the jack 23 via the same high-frequency cutoff circuit 35R and band-pass filter 36. Here, the high frequency cutoff circuits 35L and 35R are chip inductors, respectively. Thereby, when the relay cable 12 is connected, the mobile phone 14 provides the audio signals SAL and SAR to the user through the earphone 13 instead of the built-in speaker 32.

  In the cellular phone 14, the end of the high-frequency cutoff circuit 35 </ b> R on the side of the bandpass filter 36 is connected to the antenna input end of the low-band tuner 28 via the matching circuit (M) 37. Here, the bandpass filter 36 is a parallel resonant circuit of a chip inductor and a chip capacitor. The band pass filter 36 cuts off the high frequency signal in the reception frequency band of the high band tuner 29 and cuts off the connection to the jack 23 of the low band tuner 28 in this reception frequency band. Accordingly, in the band pass filter 36, the resonance frequency is set to be approximately the center frequency of the reception frequency band of the high band tuner 29 and the sharpness Q is set to a desired value so that the high frequency cutoff characteristic can be sufficiently secured. Is done. If the antenna input to the low-band tuner 28 can be suppressed by the reception frequency of the high-band tuner 29, the band-pass filter 36 may be omitted.

  The matching circuit 37 includes a chip inductor L1 that grounds the side end of the bandpass filter 36, and a chip capacitor C3 that connects the side end of the bandpass filter 36 to the antenna input end of the lowband tuner 28. The matching circuit 37 includes an earphone antenna and a lowband tuner. Matching with 28 antenna input ends is aimed at. Accordingly, the mobile phone 14 connects the core cable LR assigned to the hot side of the right channel audio signal and the cable of the earphone 13 connected to the core cable LR to the antenna input terminal of the low band tuner 28.

  The mobile phone 14 connects the terminal of the jack 23 corresponding to the tenth terminal 10 of the plug 22 to the ground. 3A and 3B, the mobile phone 14 causes the relay cable 12 to function as a coaxial transmission line, and the cable of the earphone 13 connected to the core cable LR is used as the antenna of the low-band tuner 28. Make it work. Therefore, in this case, in the earphone 13, the cable from the plug 17 to the right speaker 18R assigned to the hot side of the right audio signal functions as an antenna.

  In the mobile phone 14, the terminal of the jack 23 corresponding to the first terminal 1 of the plug 22 is further connected to the antenna input terminal of the high band tuner 29 via the switch circuit 41. Here, the switch circuit 41 is a semiconductor switch that connects the corresponding terminal of the built-in antenna 42 or jack 23 to the antenna input terminal of the high-band tuner 29 under the control of the controller 33. Accordingly, the mobile phone 14 connects, on the high band tuner 29 side, the core cable LG assigned to the ground of the audio signal and the cable of the earphone 13 connected to the core cable LG to the antenna input terminal of the high band tuner 29. To do. Similarly to the low band tuner 28, the relay cable 12 functions as a coaxial transmission line, and the cable of the earphone 13 connected to the core cable LG functions as the antenna of the high band tuner 29.

  Therefore, in this case, in the earphone 13, the cable from the plug 17 to the right speaker 18R and the cable from the plug 17 to the left speaker 18L assigned to the ground of the audio signal function as an antenna.

  Thereby, in the mobile phone 14, as schematically shown in FIG. 4 in comparison with FIG. 1, cables having different lengths in the earphone 13 function as the antennas 13A and 13B. Directly connected to the antenna input terminals of the low band tuner 28 and the high band tuner 29 via the fifth terminals 1 and 5.

  In the mobile phone 14, the jack 23 side end related to the antenna input is grounded in a direct current manner via a high-frequency cutoff circuit 43. The high frequency cutoff circuit 43 is a chip inductor. As with the low-band tuner 28 side, a band-pass filter 44 that cuts off the antenna input of the high-band tuner 29 in the reception frequency band of the low-band tuner 28 at a high frequency and an antenna input end of the high-band tuner 29 may be provided. . A matching circuit may also be provided on the high band tuner 29 side.

  If band-pass filters 36 and 44 are provided for the antenna inputs of the low-band tuner 28 and the high-band tuner 29, respectively, and the antenna input is cut off in the other reception frequency band, as shown in FIG. Even when two antennas are shared by the low-band tuner 28 and the high-band tuner 29, the high-band tuner 29 or the low-band tuner 28 is not connected to this antenna in the reception frequency band of the low-band tuner 28 and the high-band tuner 29. A state can be created.

  Therefore, in this embodiment, the low band tuner 28 and the high band tuner 29 have desired characteristics (reception sensitivity) by high frequency coupling of the cables of the earphones 13 that function as antennas of the low band tuner 28 and the high band tuner 29, respectively. If it cannot be ensured, the bandpass filter 36 or 44 can be provided as appropriate to ensure the characteristics.

  FIG. 6 is a characteristic curve diagram showing reception characteristics of the low-band tuner 28 when the band-pass filters 36 and 44 are provided and one antenna is shared by the low-band tuner 28 and the high-band tuner 29. In FIG. 6, reference numerals LV and LH denote antenna input characteristics of vertical polarization and horizontal polarization, respectively, and FIGS. 7 and 8 are tables showing the characteristics of the vertical polarization and horizontal polarization in detail. . 9 to 11 are characteristic curve diagrams showing the reception characteristics of the high-band tuner 29 under the same conditions by comparison with FIGS. 6 to 8.

  On the other hand, FIGS. 12 to 14 show the reception characteristics of the low-band tuner 28 in which the antenna used for the measurement of the characteristics of FIGS. 6 to 8 is connected only to the low-band tuner 28 by comparison with FIGS. It is a characteristic curve figure. FIGS. 15 to 17 are characteristics showing the reception characteristics of the high-band tuner 29 in which the antenna used for measuring the characteristics of FIGS. 9 to 11 is connected only to the high-band tuner 29 by comparison with FIGS. FIG.

  According to the measurement results of FIGS. 6 to 17, it can be seen that by providing the band-pass filters 36 and 44, it is possible to ensure substantially the same characteristics as when the antennas are individually connected. When one antenna is shared by the low-band tuner 28 and the high-band tuner 29, a switch circuit related to switching of antenna connections causes the measurement results of FIGS. [dB] gain degradation occurs.

  In the cellular phone 14 (FIG. 1), the terminals of the jack 23 corresponding to the third and sixth terminals of the plug 22 are connected via the high-frequency cutoff circuits 46 and 47, and then input to the controller 33. Here, the high-frequency cutoff circuits 46 and 47 are circuits that prevent high-frequency signals from entering the mobile phone 14, and are constituted by, for example, chip inductors.

  The controller 33 is a computer that controls the operation of the mobile phone 14, and executes processing such as a telephone call by controlling the operation of each unit in response to a user operation or the like. In this process, when the user instructs to receive a broadcast wave, the operation of the low band tuner 28 or the high band tuner 29 is activated in response to the user's instruction, and the content received via the low band tuner 28 or the high band tuner 29 To users. At this time, the connection of the relay cable 12 is monitored by detecting the connection of the terminal of the jack 23 corresponding to the third and sixth terminals to the ground. When the relay cable 12 is connected, the operation of the switching circuit 31 is switched, and the audio signals SAL and SAR are output from the earphone 13 instead of the built-in speaker 32. When a broadcast wave is received by the high band tuner 29, the operation of the switch circuit 41 is switched by detecting the connection of the relay cable 12, and the antenna input of the high band tuner 29 is switched from the built-in antenna 42 to the earphone antenna. .

(2) Operation of Example In the above configuration, in this cellular phone system 11 (FIGS. 1 and 2), the low band tuner 28 or the high band tuner 29 starts up in response to a user operation, and the low band tuner 28 Alternatively, the audio signals SAL and SAR received by the high band tuner 29 are output from the built-in speaker 32. When the relay cable 12 is connected to the mobile phone 14, the connection of the relay cable 12 is detected by the controller 33, and the audio signals SAL and SAR are output to the relay cable 12 instead of the built-in speaker 32.

  In the cellular phone system 11, the audio signals SAL and SAR are supplied to the cable of the earphone 13 via the core cables LL and LR of the relay cable 12, whereby the speakers 18 L and 18 R of the earphone 13 are transmitted by the audio signals SAL and SAR. Driven. In the cellular phone system 11, the audio signals SAL and SAR are thereby transmitted to the earphone 13 via the relay cable 12, and the sound of the broadcast wave received by the low band tuner 28 or the high band tuner 29 is provided to the user by the earphone 13. .

  In the cellular phone system 11, various high-frequency signals are induced in the cable of the earphone 13 in a state where the audio signals SAL and SAR are transmitted to the earphone 13 through the relay cable 12 in this way.

  Here, in the mobile phone system 11, the core cables LL and LR of the relay cable 12 for transmitting the audio signals SAL and SAR and the corresponding ground core cable LG are made into a multi-core coaxial cable surrounded by the covered wire SS, Since this covered wire SS is open-ended on the earphone 13 side and this covered wire SS is grounded on the mobile phone 14 side, the relay cable 12 is coaxial with respect to the high-frequency signal induced in the cable of the earphone 13. It will function as a transmission line.

  In the cellular phone system 11, the core cable of the relay cable 12 is thereby connected to the antenna input terminals of the low band tuner 28 and the high band tuner 29 provided in the cellular phone 14, and the cable of the earphone 13 functions as an antenna to broadcast waves. Can be received. At this time, since the relay cable 12 functions as a simple coaxial transmission line, the mobile phone 14 can receive a broadcast wave by a high-frequency signal received at a location away from the mobile phone 14, thereby affecting the influence of internal noise. Can be effectively avoided. Further, since the earphone 13 can function as an earphone antenna, an increase in size and weight of the device can be effectively avoided.

  However, if the core cable of the relay cable 12 is simply input in common to the antenna input terminals of the low band tuner 28 and the high band tuner 29, it is difficult to secure desired reception sensitivity and the like with the low band tuner 28 and the high band tuner 29. Therefore, it is necessary to switch the antenna input by a switch circuit or the like (see FIG. 35). However, if this is done, the configuration becomes complicated, and it is necessary to use electronic components with low versatility.

  Therefore, in the mobile phone system 11, the relay cable 12 is configured so that the core cables LL, LR, LG can be individually connected to the low band tuner 28 and the high band tuner 29. In the mobile phone 14, the core cables LL, LR, LGs are individually connected to the antenna input terminals of the low band tuner 28 or the high band tuner 29.

  Specifically, in the mobile phone system 11, the core cable LR of the right channel audio signal SAR is input to the antenna input terminal of the low band tuner 28 via the band pass filter 36 and the matching circuit 37. Also, a ground wire core cable LG common to the right channel audio signal SAR and the left channel audio signal SAL is input to the antenna input terminal of the high band tuner 29 via the switch circuit 41.

  As a result, the cellular phone system 11 can ensure a configuration equivalent to the case where dedicated antennas are connected to the tuners 28 and 29 without providing a configuration for switching antenna connections such as a switch circuit (FIG. 4). Thus, it is possible to effectively avoid an increase in size, weight, and decrease in reception sensitivity without using electronic components with low versatility, thereby receiving a plurality of broadcast waves.

  In addition, since a configuration similar to that in which antennas are individually connected can be ensured in this way, in the mobile phone system 11, a matching circuit is provided at the antenna input terminals of the tuners 28 and 29 as necessary to improve characteristics. As a result, the receiving sensitivity and the like can be further improved.

  FIG. 18 is a characteristic curve diagram showing characteristics when only the core cable LG of the relay cable 12 in the mobile phone system 11 is connected to the high-band tuner 29 in comparison with FIG. FIGS. 19 and 20 are tables showing the characteristics of FIG. 18 in detail in comparison with FIGS. FIG. 21 shows connections at the time of measuring the characteristics shown in FIGS.

  On the other hand, FIG. 22 is a characteristic curve diagram showing characteristics when a matching circuit is provided at the antenna input terminal of the high-band tuner 29 in the connection at the time of characteristic measurement of FIG. 18 in comparison with FIG. FIG. 23 and FIG. 24 are charts showing the characteristics of FIG. 22 in detail in comparison with FIG. 19 and FIG. Here, FIG. 25 shows connections at the time of measuring the characteristics shown in FIGS. The matching circuit is a so-called π-type matching circuit.

  On the other hand, FIG. 26 to FIG. 28 are characteristic curve diagrams showing the reception characteristics on the high band tuner 29 side in this embodiment by comparison with FIG. 18 to FIG. 18 to 25, in this embodiment, it can be seen that the high-band tuner 29 can receive a broadcast wave with substantially the same characteristics as when the matching circuit is provided.

  For reference, characteristics in the case where a high band tuner 29 is disposed in place of the low band tuner 28 and the fifth terminal 5 of the plug 22 is connected to the high band tuner 29 by comparison with FIGS. It is shown in FIGS.

(3) Advantages of the embodiment According to the above configuration, the relay cable is configured by the coaxial line using the multi-core coaxial cable, and the core cable is individually connected to the antenna input terminal of the tuner, so that the versatility can be improved. Without using low electronic components, it is possible to effectively avoid an increase in the size of the device, an increase in weight, and a decrease in reception sensitivity, thereby receiving a plurality of broadcast waves.

  More specifically, by connecting an earphone via a relay cable, this earphone cable can be used as an antenna, effectively avoiding an increase in the size, weight, and reception sensitivity of the device. Broadcast waves can be received.

  Further, by providing a matching circuit at at least one antenna input terminal of the plurality of tuners, the characteristics can be further improved.

  In the above-described embodiment, the case where two of the three core cables LL, LR, LG are connected to the antenna input terminals of the high band tuner and the low band tuner, respectively, has been described. However, the present invention is not limited to this, and three tuners may be provided in the mobile phone, and the three core cables LL, LR, LG may be connected to the antenna input terminals of the respective tuners.

  In the above-described embodiment, the case where the antenna input on the high band tuner side is switched between the built-in antenna and the earphone antenna has been described. However, the present invention is not limited to this, and as shown in FIG. 32 in comparison with FIG. When the switching of the antenna input is omitted, as shown in FIG. 33, on the low band tuner side, when the antenna input is switched between the built-in antenna and the earphone antenna, the low band tuner side and the high band tuner side as shown in FIG. In both cases, the present invention can be widely applied to the case where the antenna input is switched between the built-in antenna and the earphone antenna.

  In the above-described embodiment, the case where the relay cable is detachably connected using the connector and the earphone is further connected has been described. However, the present invention is not limited to this, and the so-called built-in relay cable is difficult to attach and detach. And it can apply widely also when connecting an earphone.

  In the above-described embodiments, the case where the earphone cable is used as an antenna has been described. However, the present invention is not limited to this, and audio signals, video signals, etc. can be transmitted to various external devices via a signal transmission cable. The present invention can be widely applied when various signals are transmitted, and further when power is transmitted to an external device via a power transmission cable.

  In the above-described embodiments, the case where the present invention is applied to a mobile phone system has been described. However, the present invention is not limited thereto, and is widely applied to various receiving devices such as a portable music player having a broadcast wave receiving function. Can be applied.

  The present invention relates to a receiving system, a receiving device, and a relay cable, and can be applied to, for example, a mobile phone capable of receiving digital radio broadcasts.

It is a block diagram which shows the mobile telephone system of Example 1 of this invention. It is a perspective view of the mobile phone system of FIG. It is a figure where it uses for description of the earphone antenna of the mobile telephone system of FIG. It is a schematic diagram which shows the connection of the antenna of the mobile telephone system of FIG. FIG. 5 is a connection diagram of FIG. 4. FIG. 6 is a characteristic curve diagram showing reception characteristics on the high-band tuner side when a band-pass filter is provided and an antenna is shared by two tuners. It is a chart which shows the characteristic of the vertical polarization in the characteristic curve figure of FIG. It is a chart which shows the characteristic of horizontal polarization in the characteristic curve figure of FIG. FIG. 6 is a characteristic curve diagram showing reception characteristics on the low-band tuner side when a band-pass filter is provided and an antenna is shared by two tuners. 10 is a chart showing vertical polarization characteristics in the characteristic curve diagram of FIG. 9. 10 is a chart showing horizontal polarization characteristics in the characteristic curve diagram of FIG. 9. FIG. 7 is a characteristic curve diagram showing characteristics in the case of only a low-band tuner by comparison with FIG. 6. 13 is a chart showing the characteristics of vertical polarization in the characteristic curve diagram of FIG. 12. 13 is a chart showing horizontal polarization characteristics in the characteristic curve diagram of FIG. 12. FIG. 13 is a characteristic curve diagram showing characteristics in the case of only a high-band tuner by comparison with FIG. 12. 16 is a chart showing the characteristics of vertical polarization in the characteristic curve diagram of FIG. 15. 16 is a chart showing horizontal polarization characteristics in the characteristic curve diagram of FIG. 15. FIG. 3 is a characteristic curve diagram showing characteristics when only the core cable LG is connected to a high-band tuner in the mobile phone system of FIG. 1. FIG. 19 is a chart showing vertical polarization characteristics in the characteristic curve diagram of FIG. 18. FIG. It is a graph which shows the characteristic of the horizontal polarization in the characteristic curve figure of FIG. It is a connection diagram which shows the connection provided for the measurement of FIG. FIG. 22 is a characteristic curve diagram showing characteristics when a matching circuit is provided in the connection of FIG. 21. It is a graph which shows the characteristic of the vertical polarization in the characteristic curve figure of FIG. It is a chart which shows the characteristic of horizontal polarization in the characteristic curve figure of FIG. It is a connection diagram which shows the connection provided for the measurement of FIG. FIG. 2 is a characteristic curve diagram showing reception characteristics of a high band tuner in the mobile phone system of FIG. 1. 27 is a chart showing the characteristics of vertically polarized waves in the characteristic curve diagram of FIG. 27 is a chart showing horizontal polarization characteristics in the characteristic curve diagram of FIG. FIG. 27 is a characteristic curve diagram showing reception characteristics on the low band side in comparison with FIG. FIG. 30 is a chart showing vertical polarization characteristics in the characteristic curve diagram of FIG. 29. FIG. 30 is a chart showing horizontal polarization characteristics in the characteristic curve diagram of FIG. 29. It is a block diagram which shows the mobile telephone system by the other Example of this invention. FIG. 33 is a block diagram showing a mobile phone system according to an example different from FIG. FIG. 34 is a block diagram showing a mobile phone system according to an example different from FIGS. 32 and 33. It is a connection diagram in the case where one antenna is shared by two tuners.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,41 ... Switch circuit, 2, 13A, 13B ... Antenna, 3, 4 ... Tuner, 11, 51, 61, 71 ... Mobile phone system, 12 ... Relay cable 12 ... Earphone, 20 ... Multi-core coaxial cable, 54, 64, 74 ... Cellular phone, LG, LL, LR ... Core wire cable, SS ... Coated wire

Claims (8)

A receiving device for receiving a desired broadcast wave by a plurality of built-in tuners;
In a receiving system having a transmission cable for transmitting the signal and / or power of the receiving device via a relay cable,
The transmission cable is a plurality of cables;
The relay cable is
It is a multi-core coaxial cable that surrounds multiple core cables with covered wires.
The transmission cable side end of the covered wire is an open end,
The transmission cable side end of the core cable is connected to one of the corresponding plurality of cables,
The receiving device is:
The receiving device side end of the covered wire is grounded,
The receiving system side end of the core wire cable is connected to the antenna input ends of the corresponding tuners. The transmission cable is
The receiving system according to claim 1, wherein the receiving system is an earphone cable having a right channel speaker and a left channel speaker connected to an end opposite to the relay cable side end. In a receiving apparatus that receives a desired broadcast wave by a plurality of built-in tuners,
Send signals and / or power to the transmission cable via the relay cable, or input power from the transmission cable via the relay cable,
The transmission cable is a plurality of cables;
The relay cable is
It is a multi-core coaxial cable that surrounds multiple core cables with covered wires.
The transmission cable side end of the covered wire is an open end,
The transmission cable side end of the core cable is connected to one of the corresponding plurality of cables,
The receiving device is:
The receiving device side end of the covered wire is grounded,
The receiving device side end of the core wire cable is connected to antenna input ends of the corresponding tuners. The transmission cable is
The receiving system according to claim 3, wherein the receiving system is an earphone cable having a right channel speaker and a left channel speaker connected to an end opposite to the relay cable side end. The receiving apparatus according to claim 3, wherein the relay cable is detachably connected via a connector. The receiving device according to claim 3, wherein a matching circuit is provided at at least one antenna input end of the plurality of tuners. In a relay cable that connects one end to a receiving device having a plurality of tuners via a connector and relays the signal and / or power of the receiving device to and from a transmission cable connected to the other end,
The transmission cable is a plurality of cables;
It is a multi-core coaxial cable that surrounds multiple core cables with covered wires.
The other end of the covered wire is an open end,
The other end of the core cable is connected to one of the corresponding cables,
The one end of the covered wire and the one end of the core cable are respectively connected to terminals of the corresponding connector,
The one end of the covered wire is grounded by the receiving device via the connector, and the one end of the core cable is connected to the antenna input ends of the corresponding tuners, respectively. Relay cable. The transmission cable is
The relay cable according to claim 7, wherein the relay cable is an earphone cable having a right channel speaker and a left channel speaker connected to an end opposite to the end of the relay cable.

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