JP2008227684A - Television broadcasting receiver and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television broadcasting receiver capable of receiving digital broadcasting and analog broadcast at low cost. <P>SOLUTION: Yagi form antennas 2, 4, and 6 are installed to receive a plurality of incoming analog television broadcasting signals from different directions. The signals received by the antennas are supplied to a mixer 8. The mixer 8 comprises a band-pass filter and passes an analog television broadcasting signal corresponding to the filter. The mixer 8 supplies a first mixed-signal, obtained by mixing output signals of the filter to a mixer 22; one loop antenna 26 receives a plurality of digital television broadcasting signals, of which the frequencies incoming from respectively different directions are close each other, and supplies them to the mixer 22. The mixer 22 comprises a band-pass filter which passes the plurality of digital television broadcasting signals from the loop antenna 26 and a band-pass filter which passes the first mixed-signal, and mixes output signals of these filters to output as a second mixed signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a television broadcast receiving apparatus and method, and more particularly, to a device that receives digital television broadcast and analog television broadcast.

  Currently, broadcasting is performed in a state where terrestrial digital broadcasting and terrestrial analog broadcasting coexist. In order to cope with this state, for example, there is a technique as disclosed in Patent Document 1. In this technique, terrestrial analog broadcasting is received by a UHF analog broadcasting antenna and supplied to a transmission line as it is. On the other hand, terrestrial digital broadcasting is received by a UHF digital broadcasting antenna, demodulated by a tuner, then modulated to a VHF band signal by a modulator, and this modulated signal is mixed with a transmission line on which the UHF analog broadcasting is transmitted. To do.

JP 2006-319798 A

However, such a technique requires a tuner and a modulator, which increases the cost.
Also, the features of digital broadcasting such as EPG are lost.

  An object of the present invention is to provide a receiving apparatus and a receiving method that can receive digital broadcasting and analog broadcasting at a low cost.

  In the receiving device of one embodiment of the present invention, a plurality of directional antennas are provided so as to individually receive a plurality of analog television broadcast signals arriving from different directions. As these directional antennas, in order to remove the influence of ghost, a directional antenna having a high gain and a high F / B ratio, for example, a Yagi antenna is desirable. Each of these antennas is installed so as to direct the directivity in the arrival direction of the radio wave of the analog television broadcast to be received. Each analog television broadcast signal is supplied to a first mixing means. The first mixing means has a plurality of first filter means corresponding to each analog television broadcast signal. Each first filter means passes the corresponding analog television broadcast signal and removes other signals. The first mixing means outputs a first mixed signal obtained by mixing the output signals of the first filter means. Since each analog television broadcast signal is passed through the corresponding first filter means, unnecessary signals can be completely removed. The frequencies of the analog television broadcast signals are not adjacent to each other, and it is not necessary to use a narrow-band frequency for the first filter means. The receiving apparatus further includes an omnidirectional antenna. The omnidirectional antenna receives a plurality of digital television broadcast signals of adjacent or adjacent adjacent channels, for example, frequencies coming from different directions are close to each other. As an omnidirectional antenna, those having the same gain in all directions are desirable. For example, a loop antenna can be used. The plurality of digital television broadcast signals received by the omnidirectional antenna and the first mixed signal are supplied to a second mixing unit. The second mixing means includes second filter means and third filter means. The second filter means passes the plurality of digital television broadcast signals and removes other signals. The third filter means passes the first mixed signal and removes other signals. The second mixing unit mixes and outputs the output signals of the second and third filter units. The second filter means allows a plurality of terrestrial digital television signals to pass therethrough, and is constituted by a number of filters smaller than the wave number thereof, and the third filter means also passes a plurality of terrestrial analog television broadcast signals. It is constituted by a number of filters smaller than the wave number.

  In the receiving apparatus configured as described above, each analog television broadcast signal is output from the first mixing unit as the first mixed signal in a state where noise is removed, and is supplied to the second mixing unit. Each digital broadcast signal is not affected by the first mixed signal after the noise is removed by the second filter unit of the second mixing unit, and the first mixed signal is also processed by the third filter unit. The digital broadcast signals are not affected by these signals, and these are output as the second mixed signal. In this receiving apparatus, a tuner and a modulator are not used, and in addition to each analog broadcast receiving antenna and first mixing means necessary for receiving analog broadcasting, an omnidirectional antenna and second mixing means Therefore, the cost can be reduced.

  For example, for digital television broadcast signals, similarly to analog television broadcast signals, an antenna is installed for each digital television broadcast signal, and a filter that allows only the reception signal of this antenna to pass is provided. Mixing with the first mixed signal is also conceivable. However, if an antenna is installed for each digital television broadcast, the cost increases. In addition, since the frequency of the digital television broadcast signal is relatively close, a filter is required to pass only the necessary digital television broadcast signal so as not to be affected by other digital television broadcast signals. Must be configured in a narrow band. However, this is technically and costly difficult. Therefore, in this receiving apparatus, since digital television broadcast signals (OFDM waves) can be received well even under the influence of multipath, all digital signals are transmitted using one omnidirectional antenna. By providing a second filter means for receiving a television broadcast signal, allowing all digital television broadcast signals to pass through, and removing other signals, it is possible to improve digital television broadcasting while reducing costs. Reception is possible.

  In the state where the directional antenna and the first mixing means as described above are provided and the analog television broadcast can be received, the omnidirectional antenna and the second mixing means described above are added. This makes it possible to receive digital television broadcast signals. In addition, since only the addition of the omnidirectional antenna and the second mixing means is required, reception is possible at low cost.

  As described above, according to the present invention, it is possible to satisfactorily receive analog and digital television broadcasts at low cost.

  As shown in FIG. 1, a receiving apparatus according to an embodiment of the present invention includes a plurality of, for example, three directional antennas that receive analog television broadcast waves arriving from different directions. These directional antennas are, for example, the Yagi antenna 2 that receives 21 channels in the UHF band, the Yagi antenna 4 that receives 34 channels in the UHF band, and the Yagi antenna 6 that receives 36 channels in the UHF band. . These Yagi-type antennas 2, 4, and 6 have high gain and high front-to-back ratio, and are arranged so that the directivity is directed toward the arrival direction of the radio wave of the corresponding channel.

  The 21, 34, and 36 channel analog television broadcast signals received by these Yagi antennas 2, 4, and 6 are mixed by a first mixing means, for example, a mixer 8. As shown in FIG. 2, the mixer 8 has an input terminal 10a to which a 21-channel analog television broadcast signal is supplied. The 21-channel analog television broadcast signal is a first filter means, for example, a band. It is supplied to the pass filter 12a. The pass band of the band pass filter 12a is selected so as to pass only the 21-channel analog television broadcast signal. Further, the mixer 8 has an input terminal 10b to which a 34-channel analog television broadcast signal is supplied. The 34-channel analog television broadcast signal is supplied to a first filter means, for example, a band-pass filter 12b. The The pass band of the band pass filter 12b is selected so as to pass only 34-channel analog television broadcast signals. The mixer 8 also has an input terminal 10c to which a 36-channel analog television broadcast signal is supplied. The 36-channel analog television broadcast signal is supplied to a first filter means, for example, a band-pass filter 12c. . The pass band of the band pass filter 12c is selected so as to pass only 36-channel analog television broadcast signals. The output signals of these bandpass filters 12a, 12b, and 12c are supplied to the output terminal 14, respectively. Therefore, only the channel 21, 34, and 36 analog television broadcast signals are mixed from the output terminal 14, and the first mixed signal not including other signal components is output.

  The first mixed signal is supplied to an amplifying means such as a booster 16. The booster 16 is also supplied with a VHF band analog television broadcast signal from the VHF band Yagi antenna 18. The VHF band Yagi antenna 18 receives a plurality of VHF band television broadcast signals transmitted from the same point. Further, the booster 16 is also supplied with a satellite broadcast / communication intermediate frequency signal received by a receiving antenna 20 for satellite broadcasting or satellite communication and frequency-converted by a converter 20a attached to the antenna. The UHF band analog television broadcast signal, the VHF band analog television broadcast signal, and the satellite broadcast / communication intermediate frequency signal are amplified by the booster 16, mixed, and output. The booster 16 is a current-carrying type, and has a DC operating power supply passage between its output side and an input terminal to which the converter 20a is connected, and the DC operating power supply is connected to the converter 20a through this passage. While being supplied, the booster 16 itself is also configured to operate by a DC operating power source supplied from the output side.

  The output signal of the booster 16 is supplied to the second mixing means, for example, the mixer 22. The mixer 22 is also supplied with an omnidirectional antenna reception signal amplified by an amplifying means such as a booster 24. The omnidirectional antenna receives a plurality of digital television broadcast waves coming from various directions and generates a digital television broadcast signal. For example, the loop antenna 26 is used as the omnidirectional antenna. The loop antenna 26 has a uniform gain from any direction of 360 degrees on the horizontal plane, and receives digital television broadcast signals of 13 to 17, 24 channels, 23, 26, and 27 channels in the UHF band.

  Channels 13, 14, 15, 16, 17, and 24 are transmitted from the same transmission location as the above-described VHF television broadcast signal, and channel 23 is the same transmission location as the above-described 34-channel analog television broadcast signal. 26 channels are transmitted from the same transmission location as the 36-channel analog television broadcast signal described above, and 27 channels are transmitted from the same transmission location as the 21-channel analog television broadcast signal described above. Yes.

  Channels 13 to 17 are transmitted in the frequency arrangement of adjacent channels, channels 26 and 27 are also transmitted in the frequency arrangement of adjacent channels, and channels 24 and 26 are transmitted in the frequency arrangement of adjacent adjacent channels. In addition, the loop antenna 26 also receives the 21, 34, and 36 channel analog television broadcast signals described above.

  These received signals are amplified by the booster 24 and supplied to the mixer 22. As shown in FIG. 3, the mixer 22 has an input terminal 28a, to which the output signal of the booster 16 is supplied. The output signal of the booster 16 is supplied to second filter means, for example, bandpass filters 30a, 30b, and also supplied to filter means, for example, high-pass filters 32a, 32b. The pass band of the band-pass filter 30a is selected so as to pass only the 21-channel analog television broadcast signal, and the pass band of the band-pass filter 30b is allowed to pass the 34- and 36-channel analog television broadcast signals. Is selected. The pass band of the high pass filter 32a is selected so as to pass the satellite broadcast / communication intermediate frequency signal, and the pass band of the low pass filter 32b is selected so as to pass the VHF band television broadcast signal. The output signals of these band pass filters 30a and 30b, high pass filter 32a and low pass filter 32b are supplied to an output terminal 34.

  The mixer 22 also has an input terminal 28b, to which the output signal of the booster 24 is supplied. The output signal of the booster 24 is supplied to the third filter means, for example, band-pass filters 36a and 36b, through the input terminal 28b. The pass band of the band pass filter 36a is selected so as to pass only the digital television broadcast signals of 13 to 17 channels, and the pass band of the band pass filter 36b passes the digital television broadcast signals of 23 to 27 channels. Have been selected. The output signals of these band pass filters 36 a and 36 b are supplied to the output terminal 34.

  Therefore, UHF band 21, 34, and 36 channel analog television broadcast signals, VHF band television broadcast signals, satellite broadcast / communication intermediate frequency signals, 13 to 17, 23, 24, 26, A mixed signal of 27-channel digital television broadcast signals is output. The analog television broadcast signals of 21, 34, and 36 channels received by the loop antenna 26 are not output.

  In order to supply direct current power for operating the booster 16 and the converter 20a, a high frequency blocking coil 38 forms a passage for direct current operation power between the output terminal 34 and the input terminal 28a. Similarly, in order to supply a DC power source for operating the booster 24, a DC operating power source passage is formed between the output terminal 34 and the input terminal 28 b by a high frequency blocking coil 40. Thus, the mixer 22 is also an energization type.

  As shown in FIG. 1, the output signal of the mixer 22 is supplied to distribution means, for example, a four distributor 42, where, for example, four are distributed and supplied to the terminal terminals 44a to 44d. Each terminal 44a to 44d is connected to a digital television receiver or an analog television receiver. Further, a DC operating power is supplied from one of the terminals 44a to 44d, for example, from the terminal terminal 44d. Therefore, the four distributors 42 are also energized.

  In order to already receive an analog television broadcast signal, the UHF band receiving Yagi antennas 2, 4, 6, the VHF band receiving antenna 18, the satellite broadcasting / communication receiving antenna 20, the booster 16, and the distributor 42 are provided. In a state where the terminal terminals 44a to 44d are installed, the loop antenna 26, the booster 24, and the mixer 22 can be newly installed in order to receive digital television broadcasting.

  In the receiving apparatus configured as described above, as shown in FIG. 4, only the analog television broadcast signals of the channels 21, 34 and 36 are output to the output signal of the mixer 8, and no other signals are generated. . Further, as shown in FIG. 5, the output signal of the mixer 22 is an analog television broadcast signal of channels 21, 34 and 36, a television broadcast signal of VHF band, and channels 13 to 17, 23, 24, 26, 27. Includes digital television broadcast signals. Although not shown in FIG. 5, satellite broadcast / communication intermediate frequency signals are also included.

  If a digital television broadcast signal is also received for each channel in the same manner as the Yagi antennas 2, 4, 6, and mixer 8, the Yagi antenna for receiving 13 to 17 and 24 channel digital television broadcasts. Channel 23 digital television broadcast Yagi antenna, channel 26 digital television broadcast reception Yagi antenna, channel 27 digital television broadcast reception Yagi antenna, and channels 13 to 17, 23 , 24, 26, and 27, nine band pass filters having a pass band are required. Moreover, among these bandpass filters, those that pass the 13 to 17 channels transmitted in the adjacent channels must be set to a narrow band so as not to be affected by the adjacent channels. The same applies to the band-pass filter for channel 23 and the band-pass filter for channel 24, as well as the band-pass filter for channel 26 and the band-pass filter for channel 27. Accordingly, a large number of Yagi antennas and a large number of narrow-band bandpass filters are required, which is troublesome to install and expensive.

  On the other hand, if the loop antenna 26 and the mixer 22 are used as in this embodiment, only one antenna is used for digital reception, and the band-pass filter used for the mixer 42 is also a plurality of antennas. Since a relatively wide band capable of passing a digital broadcast signal and a relatively wide band capable of passing a plurality of analog broadcast signals can be used, the number of antennas and the number of filters used. Can be reduced, installation and manufacture are facilitated, and the cost can be reduced.

  In the above embodiment, the satellite broadcast receiving antenna 20 and the VHF band receiving antenna 18 are provided, but these may not be necessary in some cases. In that case, the booster 16 can amplify analog television broadcast signals of 21, 34, and 36 channels in the UHF band. In some cases, the boosters 16 and 24 can be removed. Although four terminal terminals 44a to 44d are provided, the number thereof can be arbitrarily changed, and the four distributors 42 can be changed to a distributor having a distribution number corresponding to the number. In the case of a stand, the distributor 42 is not necessary. In the above embodiment, the wave number of UHF band analog television broadcasting is set to 3, and the wave number of digital television broadcasting signal is set to 9. However, the wave number is not limited to these, and it depends on the installation location of the receiving device. Each wave number is changed. In the above embodiment, the Yagi antenna is used as the directional antenna. However, the present invention is not limited to this, and other directional antennas may be used. Further, although the loop antenna is used as the omnidirectional antenna, the present invention is not limited to this, and other omnidirectional antennas can also be used.

It is a block diagram of the receiver of one Embodiment of this invention. It is a block diagram of the mixer 8 used in the receiver of FIG. It is a block diagram of the mixer 22 used in the receiver of FIG. FIG. 3 is a gain vs. frequency characteristic diagram of the output of the mixer of FIG. 2. FIG. 4 is a gain versus frequency characteristic diagram of the output of the mixer of FIG. 3.

Explanation of symbols

2 4 8 Yagi antenna (directional antenna)
8 Mixer (first mixing means)
22 Mixer (second mixing means)
26 Loop antenna (omnidirectional antenna)

Claims (2)

A plurality of directional antennas installed to individually receive a plurality of analog television broadcast signals each coming from different directions;
A plurality of first filter means corresponding to each of the analog television broadcast signals, and each first filter means passes the corresponding analog television broadcast signal and removes other signals; First mixing means for outputting a first mixed signal obtained by mixing the output signals of one filter means;
One omni-directional antenna for receiving a plurality of digital television broadcast signals whose frequencies coming from different directions are close to each other;
A second filter means for passing the plurality of digital television broadcast signals received by the omni-directional antenna and removing other signals, and further passing a first mixed signal to remove other signals; A second mixing means for mixing and outputting the output signals of the second and third filter means,
The second filter means includes a number of filters smaller than the number of waves of the plurality of digital television broadcast signals, and the third filter means is less than the number of waves of the plurality of analog television broadcast signals. A television broadcast receiver comprising a number of filters. A plurality of directional antennas individually receive a plurality of analog television broadcast signals respectively coming from different directions, and a plurality of first filter means corresponding to the respective analog television broadcast signals correspond to the corresponding analog television. A receiver for outputting a first mixed signal obtained by passing the John broadcast signal, removing other signals, and mixing the output signals of the first filter means;
An omnidirectional antenna for receiving a plurality of digital television broadcast signals whose frequencies coming from different directions are close to each other;
A second filter means for passing the plurality of digital television broadcast signals received by the omni-directional antenna and removing other signals; and a third filter means for passing the first mixed signal and removing other signals. A television broadcast receiving method comprising: a filter unit, and a second mixing unit that mixes and outputs the output signals of the second and third filter units.

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