JP3192255U - Broadcast signal conversion transmission apparatus and broadcast reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast signal conversion transmission device which modulates a received signal into FM signals having a plurality of transmission frequencies and transmits the FM signal with a simple configuration. Further, the present invention provides a broadcast reception system that transmits a broadcast signal using a joint reception facility and radiates it as a weak radio wave. A signal input 4 into which a received signal is input, a pre-amplifier 6 that amplifies the signal level of the received signal, and a received signal amplified by the pre-amplifier 6 are received signals having a predetermined reception frequency. 20 and a modulation unit having an FM modulation / amplification unit 23 that modulates the demodulated audio signal into an FM signal having a predetermined transmission frequency corresponding to the predetermined reception frequency. In the broadcast signal conversion transmission device 1 provided, a plurality of modulation units are provided, and the outputs from the respective modulation units 11, 12, 13, and 14 are combined by the synthesis unit 15 and output from the signal transmission 16. .. [Selection diagram] Fig. 1

Description

  The present invention relates to a broadcast signal transmission apparatus that converts a broadcast signal such as an AM broadcast into an FM signal that is a broadcast signal in the VHF band, and broadcast reception using the broadcast signal transmission apparatus and a joint reception facility of the facility. About the system.

  In recent years, the role of broadcasting such as AM broadcasting as information transmission means by medium waves at the time of disaster has been reviewed, but in some urban areas, the broadcast signal cannot be received due to shielding by buildings such as buildings There are places. Also, when receiving AM broadcasts, FM broadcasts, multimedia broadcasts, etc. indoors, it is difficult to receive the broadcast radio waves that arrive indoors due to the building structure. May not be able to broadcast radio waves. However, even in such a place, in many facilities, it is possible to view a television broadcast if a cable is connected to a terminal provided in a room or the like inside the facility by arranging a common reception facility. If this joint reception facility is used, broadcast signals other than television broadcasts can be transmitted to the inside of the facility. However, in many reception terminals other than televisions, there are no external antenna input terminals, so transmitted broadcasts are not provided. It has been difficult to receive a signal by a general receiving terminal.

  In order to solve such a problem, a reinforcing bar that is installed in a place where it is relatively easy to receive broadcast radio waves such as near a building window, receives AM broadcasts, converts them into FM broadcast radio waves, and radiates them with weak radio waves. There was an AM / FM conversion adapter for receiving AM broadcasts in buildings (see, for example, Patent Document 1). If this AM / FM conversion adapter for AM broadcast reception in the reinforcing bar building is used, the received AM signal is converted into an FM signal and radiated into the facility with weak radio waves. Therefore, the facility has an external antenna input terminal. AM broadcast programs can be received using FM radio or the like.

Public Utility Showa 63-95340

  However, the technique described in Patent Document 1 described above has a problem that the place where the adapter can be installed is limited to a place where radio waves such as a window can be received well, and cannot be used in a room such as a basement. there were. Also, since the radiated radio waves are weak, the area where the radiated radio waves can be received by a receiving terminal such as FM radio is limited to the vicinity of the window where the adapter is installed, and it is intended to receive broadcasts in multiple rooms. In this case, there is a problem that the adapter is required for each room. Conventionally, a system for combining single devices for different applications and converting AM broadcasts to FM broadcasts has been constructed. However, the number of devices increases in proportion to the number of FM signals to be transmitted. At the same time, there was a problem that much effort was required for installation and adjustment. Further, these systems do not have an external audio input for transmitting audio information other than broadcast signals.

  The present invention has been made to solve the above-described problems, and provides a broadcast signal conversion and transmission apparatus that modulates a reception signal such as an AM broadcast into FM signals having a plurality of transmission frequencies and transmits the FM signal. Objective. It is another object of the present invention to provide a broadcast receiving system that transmits a received broadcast signal to the inside of a facility by using a joint receiving facility and radiates it as a radio wave having a predetermined electric field strength or less.

In order to achieve the above object, the present invention provides the following means.
The broadcast signal converting and transmitting apparatus of the present invention includes a signal input unit to which a received signal is input, a signal amplifying unit for amplifying the signal level of the received signal, and a predetermined signal among the received signals amplified by the signal amplifying unit. A demodulator that demodulates a received signal having a reception frequency into an audio signal, and a modulation unit that has an FM modulator that modulates the demodulated audio signal into an FM signal having a predetermined transmission frequency corresponding to the predetermined reception frequency. A broadcast signal converting / transmitting apparatus provided for converting a signal having a predetermined reception frequency into an FM signal having a corresponding predetermined transmission frequency and transmitting the signal, wherein a plurality of the modulation units are provided. It is characterized in that at least a signal transmission unit for synthesizing and transmitting the output signals is provided.

  According to the broadcast signal conversion / transmission apparatus of the present invention, a reception signal having a predetermined reception frequency included in a reception signal input to the broadcast signal conversion / transmission apparatus is demodulated into an audio signal by a demodulation unit provided in each modulation unit. After that, the FM modulation unit modulates the FM signal to the transmission frequency corresponding to the reception frequency. Then, the FM signal modulated by each modulation unit is synthesized and transmitted by the signal transmission unit.

  In the above device, a reception frequency setting unit that sets the reception frequency of the reception signal modulated by each of the modulation units, and a reception that displays the reception frequency set by the reception frequency setting unit. A frequency setting display section; a transmission frequency setting section for setting the transmission frequency of the FM signal transmitted from each modulation unit; and a transmission frequency setting display for displaying the transmission frequency set by the transmission frequency setting section. Preferably, the reception frequency setting unit, the reception frequency setting display unit, the transmission frequency setting unit, and the transmission frequency setting display unit are arranged close to each other.

  By doing so, the reception frequency demodulated by each modulation unit is set by the operation of the corresponding reception frequency setting unit, and the set reception frequency is displayed on the corresponding reception frequency setting display unit. The The transmission frequency of the FM signal transmitted from each modulation unit is set by operating the corresponding transmission frequency setting section, and the set transmission frequency is displayed on the corresponding transmission frequency setting display section.

  Furthermore, in the above device, another signal input unit to which the received signal is input, a signal attenuating unit that attenuates a signal level of the received signal input from the other signal input unit at a predetermined rate, and the signal Further comprising another signal amplifying unit for amplifying the signal level of the received signal attenuated by the attenuating unit at a predetermined ratio, the received signal from the signal input unit is input to the modulation unit, and the other signal input Switching means for switching between a first state in which the received signal from the input unit is input to another modulation unit and a second state in which the received signal from the signal input unit is input to all the modulation units. It is preferable that it is provided.

  By doing so, the received signal input from the signal input unit is amplified by the signal amplifying unit, and the received signal input from the other signal input unit is attenuated by the signal attenuating unit and then amplified to the other signal. Amplified by the part. The distribution state of the received signals input from the two signal input units to the respective modulation units is switched to two different states of the first state and the second state by the switching means. In the first state, a received signal input from a signal input unit (a signal input unit to which only the signal amplification unit is connected) is amplified by the signal amplification unit and input to a predetermined modulation unit. At this time, the received signal input from the other signal input unit (the signal input unit to which the attenuating unit and the other amplifying unit are connected) is attenuated by the attenuating unit and then amplified by the amplifying unit to be used for the remaining modulation. Input to the unit. In the second state, the reception signal input from the signal input unit (the signal input unit to which only the signal amplification unit is connected) is input to all the modulation units.

  Further, in the above-described device, an ordinary audio signal input unit for inputting an audio signal is further provided, and the received signal is converted into an FM signal having the predetermined transmission frequency corresponding to the predetermined reception frequency and transmitted. Switching means for switching between a state and an interrupt broadcast state in which the audio signal input from the external audio signal input unit is converted to an FM signal of all the predetermined transmission frequencies and transmitted. It is preferable to do.

  In this way, in the normal broadcasting state, the reception signal input from the signal input unit is modulated into an FM signal according to a predetermined reception frequency and transmitted. On the other hand, when switched to the interrupt broadcasting state, the audio signal from the external audio signal input unit is modulated and transmitted to FM signals of all set transmission frequencies.

  In the broadcast receiving system of the present invention, a broadcast signal receiving unit that receives a broadcast signal, a transmission unit that transmits a broadcast signal received by the broadcast signal receiving unit to the inside of the facility using a joint receiving facility, and the transmission unit A radiation antenna unit that radiates a VHF band received signal as a radio wave having a strength equal to or lower than a predetermined electric field strength to a predetermined area in the facility among the broadcast signals transmitted by 5. The predetermined broadcast signal received by the other broadcast signal receiving unit, further comprising: another broadcast signal receiving unit that receives the predetermined broadcast signal; and the broadcast signal conversion / transmission apparatus according to claim 1; However, it is preferable that at least the signal input unit receives the received signal and the signal transmitted from the signal transmission unit is input to the transmission unit.

  By doing in this way, the broadcast signal received by the broadcast signal receiving unit is transmitted to the radiation antenna unit provided at a predetermined location in the facility by the transmission means using the joint receiving facility. In addition, broadcast signals other than VHF band broadcast signals received by other broadcast signal receivers are input to the broadcast signal conversion device, converted into FM signals that are VHF band broadcast signals, and the common reception facility is used. Input to the transmission means. And it is transmitted to a radiation antenna part with the broadcast signal received in the broadcast signal receiving part. Of the broadcast signals transmitted to the radiating antenna unit, VHF band broadcast signals (including broadcast signals converted to FM signals by the broadcast signal converting and transmitting device) are radio waves having electric field strengths below a predetermined electric field strength by the radiating antenna unit. And radiated to a predetermined area in the facility.

  According to the broadcast signal conversion / transmission apparatus of the present invention, since it has a plurality of modulation units, a reception signal having a plurality of reception frequencies can be simultaneously modulated and transmitted to a corresponding plurality of transmission frequency FM signals. it can. Further, if the reception frequencies of the respective modulation units are set to be the same, it is possible to modulate and transmit a reception signal of one reception frequency into FM signals of a plurality of transmission frequencies. Furthermore, since the demodulation unit and the FM modulation unit are provided in one modulation unit, it is possible to provide a broadcast signal conversion / transmission apparatus with a simple configuration and easy installation. Furthermore, according to the broadcast receiving system of the present invention, the VHF band broadcast signal transmitted by the joint receiving facility in the facility is received wirelessly using another receiving terminal such as an FM radio inside the facility. be able to. In addition, since the broadcast receiving system of the present invention includes a broadcast signal conversion / transmission device, broadcast signals other than the VHF band such as AM broadcast can be similarly transmitted as FM signals and radiated from a radiation antenna. For this reason, it is possible to receive the contents of broadcasts other than the VHF band such as AM broadcasts only by changing the setting of the reception frequency of the reception terminal such as FM radio. In addition, since transmission is performed using the joint reception facility of the facility, it is possible to receive a broadcast signal even inside a facility having a building structure in which broadcast radio waves are difficult to reach. Furthermore, even in urban areas where it is difficult to receive broadcast signals such as AM broadcasts due to shielding by buildings such as buildings, it is possible to receive FM signals modulated inside the facility.

It is an internal block diagram (block diagram) of the broadcast signal conversion transmission apparatus which concerns on 1st embodiment of this invention. 1 is a front external view of a broadcast signal conversion / transmission apparatus according to a first embodiment of the present invention. 1 is a partially enlarged view of a front external view of a broadcast signal conversion transmission device according to a first embodiment of the present invention. 1 is a partially enlarged view of an internal configuration diagram (block diagram) of a broadcast signal converting and transmitting apparatus according to a first embodiment of the present invention. It is a whole block diagram which shows the whole broadcast receiving system which concerns on 2nd embodiment of this invention.

[First embodiment]
Hereinafter, a broadcast signal conversion transmission apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

  A broadcast signal converting and transmitting apparatus 1 according to a first embodiment of the present invention includes a broadcast signal input unit 2 that inputs a received signal, a modulation unit unit 10 that modulates the input broadcast signal into an FM signal, and a modulated signal. It is mainly composed of a modulation signal sending unit 3 for sending a signal. In the following description, the description is applied to an example in which the broadcast signal input to the broadcast signal converting / transmitting apparatus 1 is an AM broadcast.

  The broadcast signal input unit 2 is provided with a signal input 4 and a signal input 5 for receiving a received signal, an input signal monitor 18 for monitoring the input signal, and an external audio signal input unit 19. The preamplifier 6 is connected to the signal input 4, and the output of the preamplifier 6 is connected to the modulation unit 11, the modulation unit 12, the input signal monitor 18, and the a switch of the signal switch 7. The input signal monitor 18 is also connected to the a-end and d-end of the signal switch 7.

  The signal input 5 is connected to an attenuator 8 and the output of the attenuator 8 is connected to a preamplifier 9. The output of the preamplifier 9 is connected to the c terminal of the signal switch 7, and the b terminal of the signal switch 7 is connected to the modulation unit 13 and the modulation unit 14, respectively. The external audio signal input unit 19 is connected to an interrupt audio signal input unit 26 provided in each of the modulation unit 11, the modulation unit 12, the modulation unit 13, and the modulation unit 14. The modulation unit 11, the modulation unit 12, the modulation unit 13, and the modulation unit 14 all have the same configuration. Hereinafter, the modulation unit 11, the modulation unit 12, the modulation unit 13, and the modulation unit 14 are collectively referred to as each modulation unit. It describes.

  The signal input 4 is a signal input unit in the scope of the utility model claims, and the preamplifier 6 is a signal amplification unit. Further, the signal input 5 is another signal input unit in the scope of the utility model claims, the attenuator 8 is a signal attenuating unit, the preamplifier 9 is another signal amplifying unit, and the external audio signal input unit 19 is an external audio input. It is considered to be a part.

  The modulation unit unit 10 mainly includes a modulation unit 11, a modulation unit 12, a modulation unit 13, and a modulation unit 14. Each modulation unit mainly includes an audio signal demodulation unit 20 that demodulates an input signal into an audio signal, and an FM modulation / amplification unit 23 that modulates the audio signal into an FM signal and performs amplification. The audio signal demodulator 20 is provided with a reception frequency setting unit 21 for setting the reception frequency of the broadcast signal to be demodulated, and a reception frequency setting display unit 22 for displaying the set reception frequency. Further, the FM modulation / amplification unit 23 is provided with a transmission frequency setting unit 24 for setting the transmission frequency of the FM signal to be transmitted, and a transmission frequency setting display unit 25 for displaying the set transmission frequency. Further, on the input side of the FM modulation / amplification unit 23, a switch 27 is provided for switching an input audio signal between a signal from the audio signal demodulation unit 20 and a signal from the interrupt audio signal input unit 26. .

  The FM modulation / amplification unit 23 is provided with an output level adjustment unit 35 (not shown in FIG. 1), so that the amplification degree of the signal in the FM modulation / amplification unit 23 can be adjusted. The output of each modulation unit is connected to a synthesizer 15, and the output of the synthesizer 15 is connected to a signal output 16 and an output signal monitor 17, respectively. The audio signal demodulator 20 is a demodulator in the utility model registration request, and the FM modulator / amplifier 23 is the FM modulator in the utility model registration request. Further, the synthesizer 15 and the signal output 16 are used as a signal transmission unit in the claims of the utility model.

  An operation panel 30, an operation panel 31, an operation panel 32, and an operation panel 33 corresponding to each modulation unit are provided on the front surface of the housing of the broadcast signal conversion / transmission apparatus 1. Further, a power switch 34 for turning on / off the power of the broadcast signal conversion transmission apparatus 1, an input signal monitor 18, and an output signal monitor 17 are also provided (see FIG. 2). The operation panel 30, the operation panel 31, the operation panel 32, and the operation panel 33 correspond to the modulation unit 11, the modulation unit 12, the modulation unit 13, and the modulation unit 14, respectively. The operation panel 30, the operation panel 31, the operation panel 32, and the operation panel 33 have the same configuration. Hereinafter, the operation panel 30, the operation panel 31, the operation panel 32, and the operation panel 33 are collectively referred to as each operation panel. Describe.

  The operation panel 30 is provided with a reception frequency setting unit 21 and a reception frequency setting display unit 22, a transmission frequency setting unit 24, and a transmission frequency setting display unit 25 in the vicinity (see FIG. 3). Note that the close arrangement means that each is arranged on the same operation panel as in the present embodiment, or they are arranged together in a predetermined part of the front part of the casing of the broadcast signal conversion transmission device 1. This means that the reception frequency setting unit 21 and the transmission frequency setting unit 24 can be operated while visually recognizing the display of the reception frequency setting display unit 22 and the transmission frequency setting display unit 25.

  By the setting by the reception frequency setting unit 21 of the operation panel 30, the reception frequency demodulated into the audio signal by the audio signal demodulation unit 20 provided in the modulation unit 11 is set. Further, the transmission frequency to be FM-modulated by the FM modulation / amplification unit 23 of the modulation unit 11 is set by the transmission frequency setting unit 24 of the operation panel 30. The set reception frequency and transmission frequency are displayed on the reception frequency setting display unit 22 and the transmission frequency setting display unit 25, respectively.

  In the reception frequency setting unit 21, a plurality of upper buttons 36 and lower buttons 37 are respectively arranged above and below the numbers on the reception frequency setting display unit 22. By pressing the upper button 36 and the lower button 37, the reception frequency can be set. In addition, the display of numbers on the reception frequency setting display unit 22 changes in accordance with the operation of the corresponding upper button 36 and lower button 37.

  Similarly, in the transmission frequency setting section 24, an upper button 38 and a lower button 39 are respectively arranged above and below each number of the transmission frequency setting display section 25, and the transmission frequency is set by pressing the upper button 38 and the lower button 39. Can be done. The number display on the transmission frequency setting display unit 25 is configured to change in accordance with the operation of the corresponding upper button 38 and lower button 39.

  Similarly, the operation panel 31, the operation panel 32, and the operation panel 33 are provided with a reception frequency setting unit 21, a reception frequency setting display unit 22, a transmission frequency setting unit 24, and a transmission frequency setting display unit 25, respectively. Similar to the operation panel 30, it is possible to set the reception frequency and the transmission frequency of the corresponding modulation unit 12, the modulation unit 13, and the modulation unit 14 and display the set frequency by operating each operation panel.

  Each operation panel is provided with a unit power switch 40 for switching on / off the power of each modulation unit. Thus, if each modulation unit is provided with a unit power switch 40, for example, if a specific modulation unit fails due to an unexpected trouble, only the failed modulation unit is powered so that other modulation units are not affected. It becomes possible to cut. In addition, when one modulation unit is installed as a spare modulation unit, the spare modulation unit can be powered off in normal times.

Next, the operation of the broadcast signal converting / transmitting apparatus 1 having the above configuration will be described.
An AM signal received by a receiving antenna or the like is input to the signal input 4 and the signal input 5. Note that the reception level of this AM signal may vary depending on the position and output of each broadcasting station. The broadcast signal conversion / transmission apparatus 1 according to the present embodiment has a configuration that switches the input of the reception signal to each modulation unit when the reception level of the broadcast signal from each broadcast station is different. Furthermore, the broadcast signal conversion transmission apparatus 1 according to the present embodiment has a configuration in which an external audio signal other than the broadcast signal is input and transmitted as an FM signal. For this reason, in the following description, the operation of the broadcast signal conversion / transmission apparatus 1 will be described separately depending on the state of the reception level of the broadcast signal from the broadcast station. Further, the operation of an external audio signal will be described.

<When broadcast signals from each broadcasting station have the same reception level>
When the received broadcast signal from each broadcast station has the same reception level, the received signal is input to the signal input 4, and the signal switch 7 is connected at its a and b ends, and further at its d end. And e end are connected. When the signal switch 7 is set in this way, the received signal input to the signal input 4 is distributed and input to the modulation unit 11, the modulation unit 12, the modulation unit 13, and the modulation unit 14.

  At this time, the reception frequency of each modulation unit is set to a desired broadcast station frequency by operating the reception frequency setting unit 21 corresponding to each modulation unit. Similarly, the transmission frequency of the FM signal to be transmitted is set to a desired transmission frequency of the FM signal transmitted from each modulation unit by operating each transmission frequency setting unit 24. Note that the FM signal transmission frequency is set to a different value in order to avoid interference and the like.

  The switch 27 of each modulation unit is set so that the g end and the h end are connected. By setting the switch 27 in this way, the signal from the audio signal demodulator 20 is input to the FM modulator / amplifier 23.

  The received signal input from the signal input 4 is amplified by the preamplifier 6 and input to the modulation unit 11, the modulation unit 12, the modulation unit 13, and the modulation unit 14. The received signal amplified by the preamplifier 6 can be monitored by the input signal monitor 18.

  As for the reception signal input to each modulation unit, the reception signal having the reception frequency set by each reception frequency setting unit 21 is demodulated into an audio signal by the audio signal demodulation unit 20. The demodulated audio signal is input to the FM modulation / amplification unit 23 via the switch 27, and is modulated and amplified to an FM signal having a frequency set by the transmission frequency setting unit 24. Note that the amplification factor of the signal by the FM modulation / amplification unit 23 can be adjusted by the output level adjustment unit 35. Outputs from the respective modulation units are combined by a combiner 15 and output from a signal output 16. The synthesized transmission signal can be monitored by the output signal monitor 17.

<When reception level of radio waves received from each broadcasting station is different>
When there is a difference of about 10 to 20 dB in the reception level from each broadcasting station, a reception signal from a broadcasting station with a weak reception level is input to the signal input 4, and a reception signal from a broadcasting station with a strong reception level is signaled Input to input 5. Further, the signal switch 7 is set so that its b end and c end are connected, and further its d end and c end are connected. When the signal switch 7 is set in this way, the received signal input from the signal input 4 is amplified by the preamplifier 6 and input to the modulation unit 11 and the modulation unit 12. On the other hand, the received signal input from the signal input 5 is attenuated by the attenuator 8, amplified by the preamplifier 9, and input to the modulation unit 13 and the modulation unit 14 (see FIG. 4). At this time, the reception frequency of the modulation unit 11 and the modulation unit 12 is set to the reception frequency of the broadcasting station having a low reception level, and the reception frequency of the modulation unit 13 and the modulation unit 14 is set to the reception frequency of the broadcasting station having a high reception level. Set it. The signal input to each modulation unit can be monitored by the input signal monitor 18.

  The signal input to each modulation unit is demodulated into an audio signal by the audio signal demodulator 20 at the reception frequency set by each reception frequency setting unit 21 and transmitted by the FM modulation / amplifier 23. The signal is modulated and amplified to an FM signal having a frequency set by the frequency setting unit 24.

  Note that the signal switch 7 is set so that the a end and the b end are connected, and the d end and the e end are further connected, and the received signal from the signal input 4 is input to each modulation unit. This is the second state in the scope of claims for utility model registration. Further, the signal switch 7 is set so that the b end and the c end are connected, and further the d end and the c end are connected, and the received signal from the signal input 4 is sent to the modulation unit 11 and the modulation unit 12. The state in which the received signal from the signal input 5 is input to the modulation unit 13 and the modulation unit 14 is the first state in the utility model registration claim. The signal switch 7 is a switching means for switching between the first state and the second state in the scope of the utility model registration request.

<When inputting an external audio signal>
In the case of inputting external sound, the external sound signal is input to the external sound signal input unit 19, and the switch 27 of each modulation unit is set so that its i-end and h-end are connected. If the switch 27 is set in this way, the audio signal from the external audio signal input unit 19 is input to each modulation unit. The input audio signal is modulated into an FM signal having a set transmission frequency by the FM modulation / amplification unit 23 of each modulation unit, amplified and transmitted.

  The state where the switch 27 is set so that the g terminal and the h terminal are connected and the signal from the audio signal demodulator 20 is input to the FM modulator / amplifier 23 is in the scope of the utility model registration claim. In the normal broadcasting state. Further, the switch 27 is set so that the i terminal and the h terminal are connected, and the state in which the audio signal from the external audio signal input unit 19 is input to the FM modulation / amplification unit 23 is the utility model registration request. The state of interruption broadcasting in the range of. The switch 27 is a switching means for switching between the normal broadcast state and the interrupt broadcast state in the scope of the utility model registration request.

  According to the broadcast signal converting and transmitting apparatus 1 having the above-described configuration, since it has a plurality of modulation units, it is possible to simultaneously modulate and transmit reception signals having a plurality of reception frequencies to FM signals having different transmission frequencies. it can. Also, if the reception frequency of each modulation unit is set to the same frequency and the transmission frequency is set to a different frequency, broadcast signals from the same broadcasting station may be transmitted as FM signals having a plurality of different transmission frequencies. Is possible. Furthermore, since the audio signal demodulation unit 20 and the FM modulation / amplification unit 23 are provided in one modulation unit, it is possible to provide a broadcast signal conversion / transmission apparatus that can be easily installed with a simple configuration. Further, since the reception frequency setting unit 21, the reception frequency setting display unit 22, the transmission frequency setting unit 24, and the transmission frequency setting display unit 25 are arranged close to each other, the set reception frequency and transmission frequency can be confirmed. However, it is possible to easily set the reception frequency and the transmission frequency.

  The received broadcast signal may have a different reception level (electric field strength of received radio wave) for each broadcast station depending on the broadcast location and broadcast power of the broadcast station. Even in such a case, the broadcast signal converting and transmitting apparatus 1 according to the present embodiment further includes the signal input 5 to which the attenuator 8 is connected. A signal can be input to the signal input 5 to adjust the attenuator 8. By doing in this way, the broadcast signal from each broadcasting station can be input to each modulation unit as a reception signal of the same level.

  Furthermore, since the broadcast signal conversion / transmission apparatus 1 according to the present embodiment has the external audio signal input unit 19, the switch 27 is switched to input the external audio signal to each FM modulation / amplification unit 23. It is possible to send an external audio signal as an FM signal. If this function is used, it is possible to transmit information from the local government or the like, for example, in the event of an emergency disaster, as the FM broadcast.

[Second Embodiment]
Next, a broadcast receiving system according to a second embodiment of the present invention will be described with reference to FIG. In addition, since the broadcast signal conversion transmission apparatus 1 used for the broadcast receiving system of this embodiment is the same as that of 1st embodiment, description of the said part is abbreviate | omitted. The description of the publicly-known parts constituting the joint reception facility 120 is also omitted.

  A broadcast receiving system 100 according to the present embodiment includes a UHF antenna 101, a VHF antenna 102, an AM antenna 103, a broadcast signal conversion / transmission apparatus 1, a joint reception facility 120, and a radiation antenna 109 connected to a wall surface terminal 108 of a room 130. It is mainly composed. Here, the room 130 refers to the inside of a room or the like of the facility where the joint reception facility 120 is provided.

  The joint reception facility 120 is a facility for transmitting a television broadcast signal or the like to a room in the facility, such as a VHF / UHF band reception amplifier 104, a combiner 105, an amplifier 106, a distribution facility 107, a coaxial cable 112, and the like. Consists mainly of. The UHF antenna 101 is an antenna that mainly receives television broadcast signals in the UHF band, and the VHF antenna 102 is an antenna that mainly receives FM broadcasts and multimedia broadcasts in the VHF band. The AM antenna 103 is an antenna that mainly receives AM broadcasts. The joint reception facility 120 may be an existing facility or a newly installed facility. In some facilities, the VHF antenna 102 may not be provided.

  In this embodiment, the UHF antenna 101 and the VHF antenna 102 are the broadcast signal receiving unit in the scope of the utility model registration request, and the AM antenna 103 is the other broadcast signal receiving unit.

  In the broadcast receiving system configured as described above, the AM signal received by the AM antenna 103 is modulated into an FM signal by the broadcast signal conversion / transmission apparatus 1. The modulated FM signal is input to the synthesizer 105 and transmitted to the room 130 together with the reception signals received by the UHF antenna 101 and the VHF antenna 102.

  Of the reception signals transmitted to the room 130, the reception signal in the VHF band is radiated by the radiation antenna 109 as a weak radio wave having a predetermined electric field strength or less. Here, the radiated VHF band received signals include FM broadcasts and multimedia broadcasts received by the VHF antenna 102 in addition to the FM signals modulated by the broadcast signal conversion transmission apparatus 1. In addition to a linear antenna such as a dipole, other known antennas having a specification in which the electric field strength at a distance of 3 m from the radiation antenna 109 is 500 μV / m or less for a signal in the VHF band are used as the radiation antenna 109. It is possible.

  In the present embodiment, the electric field intensity of the radio wave radiated from the radiating antenna 109 is set such that the electric field intensity at a distance of 3 m from the radiating antenna 109 is 500 μV / m or less for a VHF band signal. In the present embodiment, the term “below the predetermined electric field strength” is intended to mean a predetermined range in which acquisition of a license or the like is not required due to regulations of the Radio Law.

  The weak radio waves radiated from the radiating antenna 109 are broadcast radio waves in the VHF band and can be received by the receiving terminal 110 such as an FM radio, a portable terminal, or a multimedia dedicated terminal. Note that since a UHF band television broadcast signal is transmitted in the room 130 as well, if the wall surface terminal 108 and the television receiver 113 are connected by the coaxial cable 111, the television broadcast can be received.

  In the broadcast receiving system 100 configured as described above, the reception signals received by the VHF antenna 102 and the AM antenna 103 provided in the facility are transmitted using the joint reception facility 120 of the facility. It is possible to receive broadcast signals in the VHF band even within the structure facility. Furthermore, since the broadcast signal converting / transmitting apparatus 1 is provided, it is also possible to receive an AM broadcast modulated into an FM signal. Further, even in an urban area where it is difficult to receive AM broadcasting due to shielding by a building such as a building, it is possible to receive AM broadcasting modulated into FM signals inside the facility. In addition, since the transmitted reception signal in the VHF band is radiated as a weak radio wave, even a receiving terminal 110 such as an FM radio or a multimedia broadcasting receiving terminal that does not have an external antenna terminal transmits the transmitted broadcast. Can be received. Furthermore, since the received AM signal is modulated and radiated by the broadcast signal conversion / transmission apparatus 1, only the reception frequency of the receiving terminal 110 such as FM radio is changed, and in addition to the FM broadcast, It becomes possible to receive the broadcast content of the AM broadcast. In addition, since the broadcast signal conversion / transmission apparatus 1 used in the broadcast receiving system 100 includes the external audio signal input unit 19, information from local governments, for example, in the event of an emergency disaster is used as FM broadcast. It is also possible to broadcast to recipients inside the facility.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the AM broadcast is exemplified as the reception signal input to the broadcast signal conversion transmission apparatus 1, but a configuration may be adopted in which a reception signal of a broadcast other than the VHF band is input. . In the present embodiment, the reception frequency setting unit 21, the reception frequency setting display unit 22, the transmission frequency setting unit 24, and the transmission frequency setting display unit 25 are digitally integrated with a numerical value setting unit and a numerical value display unit. A switch (thum rotary switch) is used. However, the present invention is not limited to this, and other setting means and setting display means such as a dial switch or a method of displaying digital numbers on the liquid crystal according to the setting of numerical values in the setting unit may be used.

  Furthermore, although the configuration using the AM antenna as the broadcast receiving unit of the broadcast receiving system has been described, a terminal that receives a broadcast signal transmitted by a cable or the like may be used as the broadcast receiving unit.

DESCRIPTION OF SYMBOLS 1 Broadcast signal conversion transmission apparatus 2 Broadcast signal input part 3 Modulation signal transmission part 4 Signal input 5 Signal input 6 Preamplifier 7 Signal switcher 8 Attenuator 9 Preamplifier 10 Modulation unit part 11 Modulation unit 12 Modulation unit 13 Modulation unit DESCRIPTION OF SYMBOLS 14 Modulation unit 15 Synthesizer 16 Signal output 17 Output signal monitor 18 Input signal monitor 19 External audio | voice signal input part 20 Audio | voice signal demodulation part 21 Reception frequency setting part 22 Reception frequency setting display part 23 FM modulation / amplification part 24 Transmission frequency setting part 25 Transmission frequency setting display section 26 Interrupt sound signal input section 27 Switch 30 Operation panel 31 Operation panel 32 Operation panel 33 Operation panel 34 Power switch 35 Output level adjustment section 36 Up button 37 Down button 38 Up button 39 Down button 40 Unit Power switch 100 Broadcast reception System 101 UHF antenna 102 VHF antenna 103 AM antenna 104 VHF band / UHF band receiving amplifier 105 Synthesizer 106 Amplifier 107 Distribution equipment 108 Wall terminal 109 Radiation antenna 110 Receiving terminal 111 Coaxial cable 112 Coaxial cable 113 Television receiver 120 Joint receiving equipment 130 rooms

Claims (5)

A signal input unit for receiving a received signal;
A signal amplifier for amplifying the signal level of the received signal;
Of the reception signals amplified by the signal amplification unit, a demodulation unit that demodulates a reception signal of a predetermined reception frequency into an audio signal, and a predetermined transmission frequency corresponding to the predetermined reception frequency of the demodulated audio signal And a modulation unit having an FM modulation unit that modulates an FM signal of the broadcast signal conversion and transmission device that converts the signal of the predetermined reception frequency into an FM signal of a predetermined transmission frequency and transmits the signal. ,
A broadcast signal conversion / transmission apparatus comprising a plurality of the modulation units, and at least a signal transmission unit configured to combine and output signals output from the respective modulation units. A reception frequency setting unit for setting the reception frequency of the reception signal modulated by each modulation unit;
A reception frequency setting display unit for displaying the reception frequency set in the reception frequency setting unit;
A transmission frequency setting unit for setting the transmission frequency of the FM signal transmitted from each modulation unit;
A transmission frequency setting display unit for displaying the transmission frequency set in the transmission frequency setting unit;
The broadcast signal conversion transmission according to claim 1, wherein the reception frequency setting unit, the reception frequency setting display unit, the transmission frequency setting unit, and the transmission frequency setting display unit are arranged close to each other. apparatus. Other signal input unit to which the received signal is input;
A signal attenuating unit for attenuating the signal level of the received signal input from the other signal input unit at a predetermined rate;
And further comprising another signal amplifying unit that amplifies the signal level of the received signal attenuated by the signal attenuating unit at a predetermined rate,
A first state in which the received signal from the signal input unit is input to the modulation unit, and the received signal from the other signal input unit is input to another modulation unit;
3. The broadcast signal conversion transmission according to claim 1, further comprising switching means for switching a second state in which a received signal from the signal input unit is input to all the modulation units. apparatus. An external audio signal input unit for inputting an audio signal;
A normal broadcast state in which the received signal is converted into an FM signal of the predetermined transmission frequency corresponding to the predetermined reception frequency and transmitted;
The apparatus further comprises switching means for switching between an interrupt broadcast state in which an audio signal input from the external audio signal input unit is converted into all FM signals of the predetermined transmission frequency and transmitted. The broadcast signal conversion transmission apparatus according to claim 1. A broadcast signal receiver for receiving broadcast signals;
Transmission means for transmitting the broadcast signal received by the broadcast signal receiving unit to the inside of the facility using a joint receiving facility;
A radiation antenna unit that radiates a received signal in the VHF band as a radio wave having a strength equal to or lower than a predetermined electric field strength with respect to a predetermined region in the facility among the broadcast signals transmitted by the transmission means;
Other broadcast signal receivers for receiving predetermined broadcast signals other than VHF band broadcast signals;
The broadcast signal conversion transmission device according to claim 1,
Further comprising
The predetermined broadcast signal received by the other broadcast signal receiving unit is input as at least the signal input unit as the received signal,
A broadcast receiving system, wherein a signal sent from the signal sending unit is inputted to the transmission means.

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