JP4019770B2 - Satellite broadcast receiving tuner unit, satellite broadcast receiving front end unit, and satellite broadcast receiving apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a satellite broadcast receiving tuner unit, a satellite broadcast receiving front end unit, and a satellite broadcast receiving apparatus.
[0002]
[Prior art]
For example, in the case of BS analog broadcasting as an example, a conventional satellite broadcast receiving apparatus is configured to use, for example, a 12 GHz band SHF radio wave from a broadcasting satellite (BS (broadcasting satellite)) 1 as shown in FIG. Is received and supplied to the BS converter 3, converted into a first intermediate frequency signal of 1 GHz band by the BS converter 3, and this first intermediate frequency signal is supplied to the satellite broadcast tuner device 4. The reception signal supplied to the satellite broadcast tuner device 4 is an FM signal whose frequency is converted.
[0003]
In this case, the BS antenna 2 and the BS converter 3 are generally installed outdoors as a pair, and the satellite broadcast tuner device 4 is installed indoors.
[0004]
The satellite broadcasting tuner device 4 installed indoors selects a desired channel in the first intermediate frequency signal, and demodulates a television video signal and an audio signal from the FM signal.
[0005]
The television video signal and audio signal obtained by the satellite broadcast tuner device 4 are supplied to the video signal input terminal and audio signal input terminal of an AV (Audio Video) type television receiver 5.
[0006]
In this case, since the sound of satellite broadcasting is a PCM transmission method and high-fidelity sound can be received, by supplying the audio signal from the satellite broadcast tuner device 4 to the audio device, particularly for a music program or the like, a wonderful sound can be obtained. I can enjoy it.
[0007]
The satellite broadcast tuner device 4 is provided with an RF output terminal 4RF from which a UHF-13 channel signal obtained by modulating a television video signal and an audio signal into the same AM signal as a terrestrial broadcast signal can be obtained. A signal obtained at the output terminal 4RF is supplied to a conventional television receiver 6 so that the conventional television receiver 6 can receive a satellite broadcast.
[0008]
The satellite broadcast tuner device 4 is configured as shown in FIG. 5, for example. In FIG. 5, reference numeral 4I denotes a first intermediate frequency signal input terminal to which a 1 GHz band first intermediate frequency signal is supplied from the BS converter 3, and the first intermediate frequency signal is supplied to the first intermediate frequency signal input terminal 4I. A frequency signal is supplied to one input terminal of the mixing circuit 11 via the high frequency amplifier circuit 10, and a local oscillation signal from the local oscillator 12 is supplied to the other input terminal of the mixing circuit 11. Reference numeral 13 denotes a channel selection signal input terminal for supplying a channel selection signal for channel selection.
[0009]
The high-frequency amplifier circuit 10, the mixing circuit 11, and the local oscillator 12 constitute a tuning unit, that is, a tuner unit.
[0010]
In this channel selection unit, a channel selection signal of a desired channel is supplied to the channel selection signal input terminal 13, a desired channel is selected from this first intermediate frequency signal, and the center frequency is 134 on the output side of the mixing circuit 11. Obtain a second intermediate frequency signal of .26 MHz or 402.8 MHz.
[0011]
The second intermediate frequency signal obtained on the output side of the mixing circuit 11 is supplied to the FM demodulation circuit 17 via a series circuit of the intermediate frequency amplifier circuit 14, the band pass filter 15, the AGC and limiter circuit 16. The intermediate frequency amplifier circuit 14, the band pass filter 15, and the AGC / limiter circuit 16 constitute an intermediate frequency amplifier.
[0012]
The FM demodulating circuit 17 detects the FM signal from the intermediate frequency amplifying unit to obtain a television video signal and an audio PCM subcarrier signal. The detection signal obtained by the FM demodulating circuit 17 is fed back to the local oscillator 12, and control is performed so that the oscillation frequency of the local oscillator 12 is stabilized. The intermediate frequency amplification unit and the FM demodulation circuit 17 constitute a demodulation unit, and the channel selection unit and the demodulation unit constitute a front end unit.
[0013]
The output signal of the FM demodulating circuit 17 is supplied to a 4.5 MHz low-pass filter 18 constituting the video signal processing unit, and the audio PCM subcarrier signal is removed by the low-pass filter 18 so that only the TV video signal is obtained. Is supplied to the TV video signal output terminal 4V through a series circuit of the de-emphasis circuit 19, the energy diffusion signal removal circuit 20 and the video amplification circuit 21.
[0014]
The de-emphasis circuit 19 restores the original signal by processing a television video signal with a high frequency component emphasized (emphasized) in order to reduce noise on the transmission side with reverse characteristics.
[0015]
The energy spread signal removal circuit 20 removes the 15 Hz component added on the transmission side and reproduces the original television video signal.
[0016]
The supplies an output signal of the FM demodulation circuit 17 to the band-pass filter 22 of 5.73MHz which constitutes the audio signal processing unit, eject only the audio PCM subcarrier signal at the band-pass filter 22, the audio PCM sub The carrier signal is supplied to the 4-phase DPSK demodulator circuit 23.
[0017]
The 4-phase DPSK demodulator circuit 23 demodulates the audio PCM subcarrier signal into a PCM code string digital signal, and the PCM code string digital signal obtained on the output side of the 4-phase DPSK demodulator circuit 23 is a PCM demodulator circuit 24. To supply.
[0018]
This PCM demodulator circuit 24 descrambles and deinterleaves the digital signal of the PCM code string to return it to the original code string, and performs error correction, bit expansion, etc., and the audio of the PCM bit stream by the D / A converter The signal is demodulated into the original analog audio signal.
[0019]
An analog audio signal obtained by the PCM demodulation circuit 24 is supplied to the audio signal output terminal 4A. Further, 4S is an output terminal for an additional audio signal obtained by the PCM demodulation circuit 24, and 4D is an output terminal for a digital audio signal obtained by the PCM demodulation circuit 24.
[0020]
Moreover, this respective output signals of the video signal processing unit and the audio signal processing unit is supplied to the UHF television signal converter 25, the UHF television job down in signal converter 25 UHF13～15 channel UHF television signals converted The UHF television signals of UHF 13 to 15 channels obtained in the device 25 are supplied to the RF output terminal 4RF.
[0021]
In such a satellite broadcast receiving apparatus, the user is currently viewing or recording the satellite broadcast of the selected single channel.
[0022]
However, there are a plurality of satellite broadcast channels, and there are satellite broadcasts of a plurality of channels such as communication satellites (CS (communication satellite)). Applications such as simultaneous recording of satellite broadcast channels different from the channel, or viewing with multiple satellite broadcast screens are desired.
[0023]
In order to enable simultaneous viewing or recording of a plurality of different satellite broadcasts, for example, two channels, the satellite broadcast receiver is provided with a plurality of, for example, two front end units 30a and 30b each covered with a shield cover as shown in FIG. Is provided.
[0024]
6, this FIG. 6 is provided with a CS antenna 2 a similar to the BS antenna 2 in addition to the BS antenna 2, and the first intermediate frequency of the 1 GHz band from the BS antenna 2 and the CS antenna 2 a. A signal is supplied to each of the changeover switches 31a and 31b, and a desired first intermediate frequency signal obtained on the output side of each of the changeover switches 31a and 31b is supplied to a first intermediate frequency signal input terminal of each of the front end units 30a and 30b. Supply to 4I.
[0025]
The front end unit 30a includes a channel selection unit 32a and a demodulation unit 33a each including a high frequency amplification circuit 10, a mixing circuit 11, and a local oscillator 12, and the front end unit 30b includes a high frequency amplification circuit 10, a mixing circuit 11, and a local oscillator 12. The channel selection unit 32b and the demodulation unit 33b are configured to obtain satellite broadcast signals of different desired channels at the output terminals 34a and 34b of the demodulation units 33a and 33b.
[0026]
Further, in order to enable simultaneous viewing or recording of a plurality of different channels, for example, two channels of satellite broadcasting, this satellite broadcasting receiver is provided with a plurality of, for example, two tuner units 35a and 35b each covered with a shield cover as shown in FIG. You may do it.
[0027]
7, in FIG. 7, as in FIG. 6, a CS antenna 2 a similar to the BS antenna 2 is provided in addition to the BS antenna 2, and each 1 GHz band from the BS antenna 2 and the CS antenna 2 a is provided. The first intermediate frequency signal is supplied to the changeover switches 31a and 31b, and the desired first intermediate frequency signal obtained on the output side of each of the changeover switches 31a and 31b is supplied to the first intermediate frequency signals of the tuner units 35a and 35b. The signal is supplied to the frequency signal input terminal 4I.
[0028]
The tuner unit 35 a includes a high-frequency amplifier circuit 10, a mixing circuit 11, and a local oscillator 12, and the tuner unit 35 b includes a high-frequency amplifier circuit 10, a mixing circuit 11, and a local oscillator 12.
[0029]
The output signals of the tuner units 35a and 35b are supplied to a demodulator 33 having a function of two inputs and two outputs composed of an integrated circuit (IC), and the two output terminals 34a and 34b of the demodulator 33 have different hopes. Get the satellite signal of the channel.
[0030]
[Problems to be solved by the invention]
The shield cover of the front end units 30a, 30b or the tuner units 35a, 35b as shown in FIG. 6 or FIG. 7 is formed of a substantially flat sheet metal as shown in FIG. 8, and the front end units 30a, 30b or the tuners are formed. When two units 35a and 35b are arranged, between the front-end units 30a and 30b or between the tuner units 35a and 35b, as shown in FIG. There was a disadvantage that the local oscillation signals interfered with each other.
[0031]
In view of this point, the present invention provides a plurality of front end units or tuner units to prevent mutual interference between front end units or tuner units when simultaneously viewing or recording a plurality of desired channels of satellite broadcasting. The purpose is to reduce.
[0032]
[Means for Solving the Problems]
The present invention satellite tuner unit, a satellite tuner unit having a tuner to tune the satellite channels desired, the shape of the shield cover, dispersing the unnecessary radiation from the interior of the satellite tuner unit In the satellite broadcast receiving tuner unit having such a shape, the shape that disperses this unwanted radiation is a plurality of substantially hemispherical convex shapes .
[0033]
According to the present invention, since the shape of the shield cover of the satellite broadcast reception tuner unit is a plurality of substantially hemispherical convex shapes that disperse unnecessary radiation from the inside of the satellite broadcast reception tuner unit, the satellite broadcast reception tuner When a plurality of units, for example, two units are arranged in parallel and in the vicinity, unnecessary radiation is dispersed, and mutual interference between tuner units can be reduced.
[0034]
The present invention satellite front end unit, a satellite receiver front-end unit and a demodulator for demodulating the satellite broadcasting channel signal from the tuner and該選local to tune the satellite channels to be desired, the shield In the satellite broadcast reception front end unit whose cover is shaped to disperse unwanted radiation from inside the satellite broadcast reception front end unit , the shape that disperses this unwanted radiation is a plurality of substantially hemispherical convex shapes It is.
[0035]
According to the present invention, the shape of the shield cover of the satellite broadcast reception front end unit is a plurality of substantially hemispherical convex shapes that disperse unnecessary radiation from the inside of the satellite broadcast reception front end unit. When a plurality of, for example, two reception front end units are arranged in parallel with each other, unnecessary radiation is dispersed, and mutual interference between the front end units can be reduced.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a satellite broadcast receiving tuner unit, a satellite broadcast receiving front end unit, and a satellite broadcast receiving apparatus according to the present invention will be described below with reference to the drawings.
[0037]
As shown in FIG. 4, the satellite broadcast receiving apparatus according to this example is a satellite broadcast receiving apparatus, and the satellite broadcast tuner apparatus 4 includes a plurality of, for example, two front end units 30a, 30b or a plurality of pieces as shown in FIG. For example, two tuner units 35a and 35b are provided. The front end units 30a and 30b and the tuner units 35a and 35b are provided on the front and back surfaces of the shield cover 40 made of sheet metal of the front end units 30a and 30b and the tuner units 35a and 35b. For example, as shown in FIGS. 1 and 2, six hemispherical convex shapes 40a are formed to disperse unnecessary radiation from the high-frequency amplifier circuit 10 and the local oscillator 12.
[0038]
As shown in FIG. 6, in the front end unit 30a, a channel selection unit 32a and a demodulation unit 33a including the high frequency amplifier circuit 10, the mixing circuit 11, and the local oscillator 12 are arranged in the shield cover 40, and in the front end unit 30b, In the shield cover 40, a channel selection unit 32b and a demodulation unit 33b including the high frequency amplifier circuit 10, the mixing circuit 11, and the local oscillator 12 are arranged.
[0039]
Further, as shown in FIG. 7, in the tuner units 35 a and 35 b, the tuning units including the high frequency amplifier circuit 10, the mixing circuit 11, and the local oscillator 12 are arranged in the respective shield covers 40.
[0040]
In this example, the front end units 30a and 30b, the tuner units 35a and 35b, and the shield covers 40 of the tuner units 35a and 35b are considered to be radiation antennas or reception antennas against unwanted radiation, and the adjacent front end units 30a and 30b or tuner units 35a are adjacent to each other. , 35b, the mutual gain between the front end units 30a, 30b or between the tuner units 35a, 35b is reduced.
[0041]
This antenna gain has the ability to radiate electromagnetic waves in a certain specific direction with direction characteristics and the ability to converge electromagnetic waves, and reducing this directional characteristic reduces the electromagnetic radiation intensity in a certain specific direction, or It is to reduce the electromagnetic wave reception intensity from a certain direction.
[0042]
In this example, since six hemispherical convex shapes 40a are formed on the front and back surfaces of the shield cover 40 of the front end units 30a and 30b and the tuner units 35a and 35b, the front end units 30a and 30b or the tuners. When the units 35a and 35b are arranged close to each other, as shown in FIG. 2, the front end units 30a and 30b and the tuner units 35a and 35b (in FIG. 2, the front end unit 30b and the tuner unit 35b side) disperse unnecessary radiation. Therefore, the antenna gain to the front end units 30a and 30b and the tuner units 35a and 35b (in FIG. 2, the front end unit 30a and the tuner unit 35a) affected by the unnecessary radiation is reduced, and the propagation amount is reduced. It is possible to reduce mutual interference between the inter Ron preparative end unit 30a and 30b or the tuner unit 35a and 35b.
[0043]
Accordingly, in this example, a plurality of, for example, two front end units 30a and 30b or a plurality of, for example, two tuner units 35a and 35b are provided, and a plurality of, for example, two, for example, two desired channels of satellite broadcasting are viewed or recorded simultaneously. Mutual interference between the end units 30a and 30b or between the tuner units 35a and 35b is reduced, and a plurality of, for example, two desired channels of satellite broadcasting can be watched or recorded simultaneously.
[0044]
Further, in this example, by simply devising the shape of the shield cover 40, the conventional front end unit or tuner unit can basically be used, and it is not necessary to develop it again, and the cost and time required for it can be reduced.
[0045]
Further, the front end units 30a, 30b, as shown in FIG. 3 on the front and back surfaces of the tuner unit 35a, a shield cover 40 made of sheet metal 35b, unnecessary front end units 30a, 30b, the tuner unit 35a, from the interior of 35b of You may make it form the some cross-sectional triangle convex shape 40b which is the shape which makes the radiation direction diagonally upward .
[0046]
In the front end units 30a and 30b and the tuner units 35a and 35b that are the shield cover 40 as shown in FIG. 3, the direction of unwanted radiation is obliquely upward. Mutual interference between 35a and 35b can be reduced.
[0047]
Of course, the present invention is not limited to the above-described example, and the shape of the shield cover made of the sheet metal of the front end unit and the tuner unit may be other shapes that can disperse unnecessary radiation.
[0048]
Further, the present invention is not limited to the above-described examples, and various other configurations can be taken without departing from the gist of the present invention.
[0049]
【The invention's effect】
According to the present invention, a plurality of front end units or tuner units are provided to reduce mutual interference between front end units or between tuner units when simultaneously viewing or recording a plurality of desired channels of satellite broadcasting. It is possible to watch or record a plurality of desired broadcast channels at the same time.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of an embodiment of a front end unit (tuner unit) according to the present invention.
FIG. 2 is a diagram for explaining FIG. 1;
FIG. 3 is a diagram for explaining another example of the embodiment of the present invention.
FIG. 4 is a configuration diagram illustrating an example of a satellite broadcast receiving apparatus.
FIG. 5 is a block diagram showing an example of a satellite broadcast tuner device.
FIG. 6 is a configuration diagram illustrating an example of a satellite broadcast receiving apparatus.
FIG. 7 is a configuration diagram illustrating an example of a satellite broadcast receiving apparatus.
FIG. 8 is a diagram for explaining a conventional example.
[Explanation of symbols]
2 ... BS antenna, 2a ... CS antenna, 4 ... satellite broadcasting tuner device, 10 ... high frequency amplifier circuit, 11 ... mixing circuit, 12 ... local oscillator, 30a, 30b ... front end unit, 31a, 31b ... changeover switch, 32a, 32b ... tuning section, 33, 33a, 33b ... demodulation section, 34a, 34b ... output terminal, 35a, 35b ... tuner unit, 40 ... shield cover, 40a ... hemisphere Convex shape, 40b ... triangular convex shape

Claims (4)

A satellite broadcast receiving tuner unit having a channel selection unit for selecting a desired satellite broadcast channel ,
In the satellite broadcast receiving tuner unit in which the shape of the shield cover is configured to disperse unnecessary radiation from the inside of the satellite broadcast receiving tuner unit ,
A satellite broadcast receiving tuner unit, wherein the shape for dispersing the unwanted radiation is a plurality of substantially hemispherical convex shapes . A satellite broadcast reception front-end unit having a channel selection unit that selects a desired satellite broadcast channel and a demodulation unit that demodulates a satellite broadcast channel signal from the channel selection unit ;
In the satellite broadcast reception front end unit, the shape of the shield cover is configured to disperse unnecessary radiation from the inside of the satellite broadcast reception front end unit .
A satellite broadcast receiving front end unit characterized in that a shape for dispersing the unnecessary radiation is a plurality of substantially hemispherical convex shapes . A plurality of satellite broadcast receiving tuner units having a tuning section for selecting a desired satellite broadcast channel are provided, and the shape of the shield cover of the plurality of satellite broadcast receiving tuner units is not required from the inside of the satellite broadcast receiving tuner unit. In a satellite broadcast receiver with a shape that disperses radiation ,
A satellite broadcast receiving apparatus characterized in that a shape for dispersing the unnecessary radiation is a plurality of substantially hemispherical convex shapes . A plurality of satellite broadcast reception front end units having a channel selection unit for selecting a desired satellite broadcast channel and a demodulation unit for demodulating a satellite broadcast channel signal from the channel selection unit are provided, and the plurality of satellite broadcast reception front end units are provided. In the satellite broadcast receiving apparatus , the shape of the shield cover of the satellite broadcast reception front end unit is shaped to disperse unwanted radiation from the inside ,
A satellite broadcast receiving apparatus characterized in that a shape for dispersing the unnecessary radiation is a plurality of substantially hemispherical convex shapes .

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