JP2003309776A - Tuner for receiving digital terrestrial broadcasting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tuner for receiving a digital terrestrial broadcasting which realizes low power consumption, a small size and a low cost by parallelly receiving two different digital terrestrial broadcastings by a single tuner for digital terrestrial broadcast reception and which prevents a deterioration in reception performance. <P>SOLUTION: The tuner is provided with: at least one input terminal 1; a frequency conversion circuit part 6a comprising a local oscillation circuit 8a for converting the frequency of an input signal from the input terminal 1 to an intermediate frequency, a mixer circuit 7a and a PLL circuit 9a; and a frequency conversion circuit part 6b consisting of a local oscillation circuit 8b, a mixer circuit 7b and a PLL circuit 9b. The at least two frequency conversion circuit parts 6a and 6b output intermediate frequency signals of each to the outside of the tuner in parallel. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terrestrial digital reception tuner for receiving two or more different terrestrial digital broadcasts or a terrestrial digital broadcast and a terrestrial analog broadcast in parallel.

[0002]

2. Description of the Related Art Terrestrial digital broadcasting, 2002 12
In March, a test broadcast was held mainly in the Tokyo metropolitan area.
The main broadcast is scheduled to start in December of the year.

Since digital signals are output in terrestrial digital broadcasting, set top boxes (hereinafter referred to as "S
TB (Set Top Box) ". ) Itself has HDD (Hard Dis
k Drive: hard magnetic disk device), it is possible to record a digital signal in the HDD and to process the recorded and received image by using a personal computer or the like. Note that the set top box is a home communication terminal that uses a television for display.

Therefore, there are also applications such as receiving a plurality of the same or different digital broadcasts and recording the digital broadcasts in the HDD, or receiving an existing analog broadcast while receiving the digital broadcasts and recording it in the HDD. Will be needed. In this case, it has a function of distributing the signal input from the input terminal by a Y distributor or the like and distributing and outputting one signal, and frequency-converting the other signal,
OFDM (Orthogonal Frequency Division Multiplex:
Orthogonal Frequency Division Multiplexing) A tuner having a function of performing demodulation processing or analog demodulation processing, and a tuner having a function of similarly frequency-converting a distributed output signal of this tuner as an input signal and performing OFDM demodulation processing or analog demodulation processing Two or more tuners are required. That is, for example, when one tuner receives a digital broadcast of a channel while the other tuner receives a digital broadcast of another channel as a back program and records it on the HDD, two or more tuners are required. Will be needed.

Conventional terrestrial digital broadcast receiving tuners include a single conversion system in which frequency conversion is performed only once, and a double conversion system in which frequency conversion is performed twice, as in analog broadcasting.

Also in the double conversion system, the up-down system which is mainly used in CATV (Cable Television), and the single conversion system described above in order to reduce current consumption in the OFDM demodulation IC (Integrated Circuit) The first intermediate frequency signal (hereinafter referred to as "IF (Intermediate Frequenc
y) Signal ”. ) Is further converted into a lower second IF signal and used.

The single conversion system, the up-down system, and the Low-IF system will be described with reference to simple block diagrams up to the intermediate frequency shown in FIGS.

First, in the single conversion system in which the frequency conversion is performed only once, as shown in FIG. 6, an input signal from the input terminal 201 is amplified by an RF (Radio Frequency) amplifier 202, for example, Y distribution. The signal is distributed by the distributor 203 such as a container.

One distribution signal is output from the distribution output terminal 204. On the other hand, the other distributed signal is band-pass filtered by a band-pass filter 205, level-controlled by an RF gain controller 206 to a predetermined signal level, and an intermediate frequency of, for example, 5 by a frequency conversion circuit unit 207.
The frequency is converted to 7 MHz. The frequency conversion circuit unit 2
Reference numeral 07 denotes a mixer circuit 208 and a local oscillator circuit 209.
And PL for controlling the frequency of the local oscillator circuit 209.
It comprises an L (Phase Locked Loop) circuit 210.

The intermediate frequency output from the frequency conversion circuit section 207 is band-pass filtered again by the band-pass filter 211 and then level-controlled again by the IF gain controller 212 so as to have a predetermined signal level. The signal is amplified by the IF amplifier 213 and output from the IF signal output terminal 214.

Next, in the up-down system, which is one of the double conversion systems in which frequency conversion is performed twice, the input signal from the input terminal 221 is amplified by the RF amplifier 222 as shown in FIG. Signals are distributed by a distributor 223 such as a Y distributor, and one distribution signal is output from a distribution output terminal 224.

The other distributed signal is band-pass filtered by a band pass filter 225, level-controlled to a predetermined signal level by an RF gain controller 226, and firstly frequency-converted by a first frequency conversion circuit section 227. Is converted to a frequency higher than the input frequency of about 1200 MHz, for example.

The first frequency conversion circuit section 227 includes a first mixer circuit 228 and a first local oscillator circuit 22.
9 and a PLL circuit 230 that controls the frequency of the first local oscillator circuit 229. The first intermediate frequency output from the first frequency conversion circuit unit 227 is band-pass filtered again by the band-pass filter 231, amplified by the IF amplifier 232, and filtered again by the band-pass filter 233. Then, in the second frequency conversion circuit unit 234, the second intermediate frequency, for example, 5
The frequency is converted to about 7 MHz.

The second frequency conversion circuit section 234 includes a second mixer circuit 235 and a second local oscillator circuit 23.
It consists of 6 and 6. The second intermediate frequency output from the second frequency conversion circuit unit 234 is the bandpass filter 2
The IF gain controller 23 is band-filtered at 37.
The level is again controlled at 8 so that the signal has a predetermined signal level, the signal is amplified by the IF amplifier 239, and output from the IF signal output terminal 240.

Next, a Low-IF system, which is another system in the double conversion system in which frequency conversion is performed twice, will be described with reference to FIG. This Low-IF
In the method, as described above, the first IF signal frequency-converted by the single conversion shown in FIG. 6 described above is converted into a lower second IF signal for use.

That is, as shown in FIG. 6, the input signal from the input terminal 251 is the RF amplifier 252 as in FIG.
Signal is amplified by a distributor 253 such as a Y distributor, and one of the distributed signals is distributed to a distribution output terminal 254.
Is output from. On the other hand, the other divided signal is band-pass filtered by the band-pass filter 255, level-controlled by the RF gain controller 256 to a predetermined signal level, and the first frequency conversion circuit unit 257 outputs the first intermediate frequency. For example, the frequency is converted to about 57 MHz.
The first frequency conversion circuit unit 257 controls the frequency of the first mixer circuit 258, the first local oscillation circuit 259, and the first local oscillation circuit 259.
And an L circuit 260.

The first intermediate frequency output from the first frequency conversion circuit unit 257 is the bandpass filter 26.
After being band-filtered again by 1, the IF gain controller 262 controls the level again so that the signal level becomes a predetermined signal level. Up to this point, the process is the same as in FIG.

Next, the signal whose level is controlled again by the IF gain controller 262 is the second frequency conversion circuit section 2
At 63, the frequency is converted to a second intermediate frequency, for example, about 4 MHz. The second frequency conversion circuit unit 263 includes the second mixer circuit 264 and the second local oscillation circuit 26.
It consists of 5.

The second intermediate frequency output from the second frequency conversion circuit unit 263 is the low-pass filter 266.
Then, the signal is band-filtered by, the signal is amplified by the IF amplifier 267, and output from the IF signal output terminal 268.
As a result, the OFDM demodulation IC (Integrated Circuit:
The current consumption in the semiconductor integrated circuit) can be reduced.

Next, a conventional technique for receiving terrestrial analog broadcasting and terrestrial digital broadcasting in parallel will be described using a single conversion system.

When receiving terrestrial analog broadcasting and terrestrial digital broadcasting in parallel, as shown in FIG. 9, two systems of terrestrial analog tuner section 300 and terrestrial digital tuner section 320 are required. Becomes

In the terrestrial analog tuner unit 300, the input signal from the input terminal 301 is an RF amplifier 302.
The signal is amplified by, and distributed by a distributor 303 such as a Y distributor, and one of the distributed signals is distributed by a distribution output terminal 304.
And is connected to the input terminal 321 of the terrestrial digital tuner unit 320.

The other distributed signal is band-pass filtered by the band-pass filter 305 in the terrestrial analog tuner unit 300 and level-controlled by the RF gain controller 306 to have a predetermined signal level. In the unit 307, the frequency is converted to an intermediate frequency, for example, 57 MHz. The frequency conversion circuit unit 307 includes a mixer circuit 308, a local oscillator circuit 309, and a PLL circuit 310 that controls the frequency of the local oscillator circuit 309.
Consists of.

The intermediate frequency output from the frequency conversion circuit unit 307 is band-filtered again by the band-pass filter 311 and then level-controlled again by the IF gain controller 312 to a predetermined signal level. I
The signal is amplified by the F amplifier 313, and the IF signal output terminal 3
It is output from 14.

On the other hand, the terrestrial digital tuner unit 32
0, the input signal from the input terminal 321 is the RF amplifier 3
The signal is amplified at 22, band-pass filtered at a band pass filter 325, level-controlled at a predetermined signal level by an RF gain controller 326, and frequency-converted to an intermediate frequency, for example, 57 MHz by a frequency conversion circuit unit 327. It The frequency conversion circuit unit 327 includes a mixer circuit 328, a local oscillation circuit 329, and a PLL circuit 330 that controls the frequency of the local oscillation circuit 329.

The intermediate frequency output from the frequency conversion circuit unit 327 is band-pass filtered again by the band pass filter 331 and then level-controlled again by the IF gain controller 332 so as to have a predetermined signal level. I
The signal is amplified by the F amplifier 333, and the IF signal output terminal 3
It is output from 34.

In the figure, the distributor 303 is attached to the terrestrial analog tuner unit 300 and the distribution output terminal 304 is connected to the input terminal 321 of the terrestrial digital tuner unit 320. However, the present invention is not limited to this. As shown in, the terrestrial analog tuner unit 300 and the terrestrial digital tuner unit 320 may be independently input with signals from the antennas. The description of FIG. 10 is similar to the description of FIG.

[0028]

However, in the conventional tuner for receiving terrestrial digital broadcasting, the above-mentioned tuner for receiving terrestrial digital broadcasting receives two or more different terrestrial digital broadcastings in parallel, or receives the same terrestrial digital broadcasting while receiving one terrestrial digital broadcasting. When recording the terrestrial digital broadcast of, or receiving the terrestrial analog broadcast while receiving the terrestrial digital broadcast, it is necessary to have two or more digital broadcast receiving tuner units or analog broadcast receiving tuner units. . For this reason, there is a problem that the entire system is complicated, a relatively large space is required, and the cost is increased.

Further, when receiving digital broadcasts of the same channel in parallel, in the tuners of two systems, for example, the frequency conversion circuit unit 307 shown in FIG. 9 and FIG.
When the intermediate frequencies converted by 327 are the same, the local oscillation frequencies used in the frequency conversion circuit units 307 and 327 become the same frequency in the two tuner units, and the local signals are interfered between the two tuners. There is a problem in that the reception performance is easily deteriorated and the reception performance is deteriorated.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to reduce two terrestrial digital broadcastings in parallel by one terrestrial digital receiving tuner. An object of the present invention is to provide a terrestrial digital broadcast receiving tuner that consumes less power, is smaller in size, and is inexpensive, and to provide a terrestrial digital broadcast receiving tuner that can prevent deterioration of reception performance.

[0031]

In order to solve the above problems, a tuner for receiving terrestrial digital broadcasting according to the present invention has a local oscillating circuit and a mixer circuit for frequency-converting a signal input from an input terminal into an intermediate frequency signal. In a terrestrial digital reception tuner having a frequency conversion circuit unit composed of a PLL circuit and a PLL circuit, at least two or more input terminals and at least two or more for frequency-converting input signals from the input terminals to an intermediate frequency in parallel are provided. And the at least two or more frequency conversion circuit units output the intermediate frequency signals to the outside of the tuner in parallel.

According to the above invention, the tuner for receiving terrestrial digital broadcasting has at least one input terminal,
At least two or more frequency conversion circuit units are provided for converting the frequency of the input signals from the input terminals in parallel to an intermediate frequency. Then, the at least two frequency conversion circuit units output the respective intermediate frequency signals in parallel to the outside of the tuner.

Therefore, the single conversion method in which the frequency conversion is performed only once and / or the frequency conversion is performed in two
It is possible to incorporate at least two double conversion methods that are performed in a tuner for receiving terrestrial digital broadcasting.

As a result, by receiving two different terrestrial digital broadcasts in parallel by one terrestrial digital broadcast tuner, it is possible to provide a terrestrial digital broadcast receiving tuner with low power consumption, small size and low cost. it can.

In order to solve the above-mentioned problems, the tuner for receiving terrestrial digital broadcasting of the present invention includes a first local oscillator circuit for frequency-converting a signal input from an input terminal into a first intermediate frequency signal. First mixer circuit and P
A second frequency conversion circuit unit including an LL circuit, and a second local oscillation circuit and a second mixer circuit for frequency-converting the first intermediate frequency signal into a second intermediate frequency signal. In the terrestrial digital reception tuner including the frequency conversion circuit unit, the at least one or more input terminals and the input signals from the input terminals are arranged in parallel.
The at least two or more first frequency conversion circuit units that perform frequency conversion to the intermediate frequencies of the above, and at least one or more of the respective first intermediate frequencies output from the above-mentioned first frequency conversion circuit units to the second frequency conversion circuit units. And the second frequency conversion circuit unit for converting the intermediate frequency signals to the outside of the tuner in parallel. It is characterized by that.

According to the above invention, the tuner for receiving terrestrial digital broadcasting has at least one or more input terminals,
At least two or more first frequency conversion circuit units that frequency-convert the input signals from the input terminals in parallel to the first intermediate frequency, and the first frequency conversion circuit units output from the first frequency conversion circuit units. And a second frequency conversion circuit section for converting at least one of the intermediate frequencies to the second intermediate frequency. Then, the first frequency conversion circuit unit and the second frequency conversion circuit unit output the respective intermediate frequency signals in parallel to the outside of the tuner.

Therefore, at least two double conversion systems for performing frequency conversion twice can be incorporated in the terrestrial digital broadcast receiving tuner.

As a result, by receiving two different terrestrial digital broadcasts in parallel with one terrestrial digital broadcast tuner, it is possible to provide a terrestrial digital broadcast receiving tuner with low power consumption, small size, and low cost. it can.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein an input signal from one input terminal is converted into at least two or more frequency conversion circuit sections or at least. It is characterized in that a distributor such as a Y distributor, which distributes to two or more first frequency conversion circuit units, is provided.

According to the above invention, an input signal from one input terminal is distributed to the at least two or more frequency conversion circuit sections or the at least two or more first frequency conversion circuit sections, for example, a Y divider. Etc. are provided.

Therefore, the input signal can be distributed by the distributor such as the Y distributor.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein the input signal from the input terminal is signal-distributed by a distributor, and one of the signal-distributed one is , The first frequency conversion circuit section performs frequency conversion to a first intermediate frequency of 30 to 60 MHz and outputs the first intermediate frequency signal to the outside of the tuner, while the signal is distributed by the distributor. 1 GHz in another first frequency conversion circuit unit
Frequency conversion to a first intermediate frequency of ˜1.5 GHz and frequency conversion of the first intermediate frequency signal to a second intermediate frequency of 0 to 60 MHz by the second frequency conversion circuit section. The intermediate frequency signal of 2 is output to the outside of the tuner.

According to the above invention, the input signal from the input terminal is distributed by the distributor, and one of the distributed signals is 30 to 60M in the first frequency conversion circuit section.
The frequency is converted to a first intermediate frequency of Hz and the first intermediate frequency signal is output to the outside of the tuner. On the other hand, while the signal is distributed by the distributor, another first frequency conversion circuit section frequency-converts the signal into a first intermediate frequency of 1 GHz to 1.5 GHz, and the first intermediate frequency signal is In the second frequency conversion circuit unit, the second frequency of 0 to 60 MHz
And the second intermediate frequency signal is output to the outside of the tuner.

Therefore, on the other hand, a single conversion system that performs frequency conversion only once and an up-down system that is one of the double conversion systems that performs frequency conversion twice are built in the tuner for receiving terrestrial digital broadcasting. can do.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein the input signal from the input terminal is distributed by a distributor, and one of the distributed signals is , The first frequency conversion circuit section performs frequency conversion into a first intermediate frequency of 30 to 60 MHz, and the first intermediate frequency signal is converted into a second intermediate frequency signal.
In the frequency conversion circuit section of the above, the frequency is converted to the second intermediate frequency of 0 to 10 MHz and the second intermediate frequency signal is output to the outside of the tuner. 1G in 1 frequency conversion circuit
Frequency is converted to a first intermediate frequency of Hz to 1.5 GHz, and the first intermediate frequency signal is frequency converted to a second intermediate frequency of 0 to 60 MHz by another second frequency conversion circuit unit. The second intermediate frequency signal is output from the tuner.

According to the above invention, the tuner for receiving terrestrial digital broadcast distributes the input signal from the input terminal by the distributor, and one of the distributed signals is provided in the first frequency conversion circuit section. Frequency-converted to a first intermediate frequency of 30 to 60 MHz, and the first intermediate frequency signal is converted to a second frequency of 0 to 10 MHz by the second frequency conversion circuit unit.
And the second intermediate frequency signal is output to the outside of the tuner. On the other hand, while the signal is distributed by the distributor, another first frequency conversion circuit section frequency-converts the signal into a first intermediate frequency of 1 GHz to 1.5 GHz, and the first intermediate frequency signal is Another second frequency conversion circuit section performs frequency conversion to a second intermediate frequency of 0 to 60 MHz and outputs the second intermediate frequency signal from the tuner.

Therefore, on the other hand, Lo, which is another method in the double conversion method in which frequency conversion is performed twice, is performed.
The w-IF system and, on the other hand, the up-down system which is one of the double conversion systems in which frequency conversion is performed twice can be built in the tuner for receiving terrestrial digital broadcasting.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the terrestrial digital broadcast receiving tuner, wherein when the plurality of second frequency converting circuit units are present, the second frequency converting circuit is provided. It is characterized in that the second local oscillating circuit section used for the section is shared.

According to the above invention, when there are a plurality of the second frequency conversion circuit sections, the second local oscillation circuit section used for the second frequency conversion circuit section is shared, so that the number of parts is reduced. Can be reduced. Therefore,
Further, it is possible to provide a tuner for receiving terrestrial digital broadcasting which is low in power consumption, small in size, and inexpensive.

The terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein the plurality of first intermediate frequency signals or second intermediate frequency signals output in parallel are provided. An OFDM demodulator for digital signal processing is provided by less than the number of the plurality of first intermediate frequency signals or second frequency signals output in parallel.

According to the above invention, the OFDM demodulation section for digitally processing the plurality of first intermediate frequency signals or the second intermediate frequency signals output in parallel is output in parallel. Only less than the number of first intermediate frequency signals or second frequency signals of the book are provided.

Therefore, the OFDM demodulation section can perform the OFDM demodulation processing on the digital signal.

The terrestrial digital broadcast receiving tuner of the present invention is, in the above terrestrial digital broadcast receiving tuner, at least for analog signal processing the first intermediate frequency signal or the second intermediate frequency signal. It is characterized in that at least one analog demodulation circuit section is provided.

According to the above invention, since at least one analog demodulation circuit section is provided, the analog demodulation circuit section can perform analog demodulation.

The terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein the OFDM demodulation section is provided with a reference oscillator, and the reference oscillator signal, And a signal obtained by multiplying or dividing the signal of the reference oscillator by the second
It is characterized in that it is shared as a signal of the second local oscillation circuit used in the frequency conversion circuit section of.

According to the above invention, the OFDM demodulator is provided with the reference oscillator, and the signal of the reference oscillator and the signal obtained by multiplying or dividing the signal of the reference oscillator are used as the second oscillator. Since the signal is shared as the signal of the second local oscillation circuit used in the frequency conversion circuit section, the number of parts can be reduced. Therefore, it is possible to provide a tuner for receiving terrestrial digital broadcasting, which has lower power consumption, is small in size, and is inexpensive.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein the frequency conversion circuit unit or the first frequency conversion circuit unit to the second frequency conversion circuit unit, It is characterized in that the ground patterns on each board up to the OFDM demodulation section or the analog demodulation circuit section are separated.

According to the above invention, the ground pattern on each board from the frequency conversion circuit unit or the first frequency conversion circuit unit to the second frequency conversion circuit unit, the OFDM demodulation unit or the analog demodulation circuit unit is separated. Has been done.

For this reason, it is difficult for the two local signals to interfere with each other. Therefore, it is possible to provide a tuner for receiving terrestrial digital broadcasting that can prevent deterioration of reception performance.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein the frequency conversion circuit unit or the first frequency conversion circuit unit to the second frequency conversion circuit unit, It is characterized in that the OFDM demodulation unit or the analog demodulation circuit unit is housed in the same chassis.

According to the above invention, the frequency conversion circuit unit or the first frequency conversion circuit unit to the second frequency conversion circuit unit, the OFDM demodulation unit or the analog demodulation circuit unit are accommodated in the same chassis. There is.

Therefore, it is possible to further provide a terrestrial digital broadcast reception tuner capable of preventing deterioration of reception performance.

[0063]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The following will describe one embodiment of the present invention with reference to FIG.

As shown in FIG. 1, the digital broadcast receiving tuner 10 of this embodiment is provided with two single conversion systems.

In the digital broadcast receiving tuner 10, the signal input from the input terminal 1 is amplified by an RF (Radio Frequency) amplifier 2 as shown in FIG. The signal is distributed by the device 3.
One side of the signal distribution is band-pass filtered by the band pass filter 4a, level-controlled to a predetermined level by the RF gain controller 5a, and frequency-converted into an intermediate frequency signal, for example, 57 MHz by the frequency conversion circuit unit 6a.

The frequency conversion circuit section 6a includes a mixer circuit section 7a, a local oscillation circuit section 8a, and a PLL (Phase Locked Loo) for frequency controlling the local oscillation circuit section 8a.
p: phase locked loop) circuit section 9a. The intermediate frequency signal frequency-converted by the frequency conversion circuit unit 6a is
After band-pass filtering by the band-pass filter 11a, level control is performed again by the IF gain controller 12a,
The level is amplified by the IF amplifier 13a, and the IF output terminal 1
4a is output.

On the other hand, the other side of the signal distributed by the distributor 3 is similarly band-pass filtered by the band pass filter 4b, level-controlled to a predetermined level by the RF gain controller 5b, and the frequency conversion circuit section. At 6b, the frequency is converted to an intermediate frequency signal, for example, 57 MHz.

The frequency conversion circuit section 6b comprises a mixer circuit section 7b, a local oscillation circuit section 8b, and a PLL circuit section 9b for controlling the frequency of the local oscillation circuit section 8b. The intermediate frequency signal frequency-converted by the frequency conversion circuit unit 6b is band-pass filtered by the band pass filter 11b, level-controlled again by the IF gain controller 12b, and level-amplified by the IF amplifier 13b. It is output to the IF output terminal 14b.

The IF output terminals 14a and 14b are
An FDM (Orthogonal Frequency Division Multiplex) demodulation circuit or an analog demodulation circuit can be input to receive a terrestrial digital signal or a terrestrial analog signal in parallel.

As described above, in the terrestrial digital broadcast receiving tuner 10 of the present embodiment, at least one or more input terminals 1 and at least the frequency of the input signal from the input terminal 1 are converted in parallel to the intermediate frequency. Two or more of the frequency conversion circuit units 6a and 6b are provided. Then, the at least two or more frequency conversion circuit units 6a and 6b are
The respective intermediate frequency signals are output in parallel to the outside of the tuner.

Therefore, at least two single conversion systems that perform frequency conversion only once can be incorporated in the terrestrial digital broadcast receiving tuner 10.

As a result, one terrestrial digital receiving tuner 10 receives two different terrestrial digital broadcastings in parallel, thereby providing the terrestrial digital broadcasting receiving tuner 10 with low power consumption, small size, and low cost. be able to.

Further, in the terrestrial digital broadcast receiving tuner 10 of the present embodiment, an input signal from one input terminal is supplied to at least two or more frequency conversion circuit sections 6a.6.
A distributor 3 such as a Y distributor for distributing to b is provided.

Therefore, the input signal can be distributed by the distributor 3 such as the Y distributor.

[Second Embodiment] The following will describe another embodiment of the present invention in reference to FIG. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment will be designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 2, the digital broadcast receiving tuner 20 of this embodiment is provided with two Low-IF systems in the double conversion system.

In the digital broadcast receiving tuner 20, as shown in the figure, the signal input from the input terminal 21 is amplified by the RF amplifier 23 and then signaled by the distributor 23 such as a Y distributor. To be distributed.

One side of the signal distribution is band-pass filtered by the band pass filter 24a, and the RF gain controller 2
5a controls the level to a predetermined level, and the first frequency conversion circuit unit 26a controls the first intermediate frequency signal, for example, 57
The frequency is converted to MHz.

The first frequency conversion circuit section 26a includes a first mixer circuit section 27a, a first local oscillation circuit section 28a, and a PLL circuit section 29a for frequency controlling the first local oscillation circuit section 28a. Become.

The first intermediate frequency signal frequency-converted by the first frequency conversion circuit section 26a is band-pass filtered by the band-pass filter 31a and then level-controlled again by the IF gain controller 32a. The second intermediate frequency signal, for example, 4 MH in the second frequency conversion circuit unit 33a.
The frequency is converted to about z.

The second frequency conversion circuit section 33a includes a second mixer circuit section 34a and a second local oscillation circuit section 35.
a.

The second intermediate frequency signal frequency-converted by the second frequency conversion circuit section 33a is band-pass filtered by the low-pass filter 36a, level-amplified by the IF amplifier 37a, and the IF output terminal 38a. Is output to.

On the other hand, the other side of the signal distributed by the distributor 23 is similarly band-pass filtered by the band pass filter 24b and level-controlled to a predetermined level by the RF gain controller 224b, and the first frequency conversion is performed. Circuit part 22
At 5b, the frequency is converted to a first intermediate frequency signal, for example 57 MHz.

The first frequency conversion circuit section 26b described above is
It comprises a first mixer circuit section 27b, a first local oscillation circuit section 28b, and a PLL circuit section 29b which controls the frequency of the first local oscillation circuit section 28b.

The first intermediate frequency signal whose frequency has been converted by the first frequency conversion circuit section 26b is band-pass filtered by the band pass filter 31b and then level-controlled again by the IF gain controller 32b. In the second frequency conversion circuit unit 33b, the second intermediate frequency signal, for example, 4M
The frequency is converted to about Hz.

The second frequency conversion circuit section 33b comprises a second mixer circuit section 34b and a second local oscillation circuit section 35b. The second local oscillation circuit section 35b and the second local oscillation circuit section 35a are
Can be shared.

The second intermediate frequency signal frequency-converted by the second frequency conversion circuit section 33b is band-pass filtered by the low-pass filter 36b, level-amplified by the IF amplifier 37b, and the IF output terminal 38b. Is output to.

Therefore, the IF output terminals 38a and 38b
Can be input to the OFDM demodulation circuit to receive terrestrial digital signals in parallel.

As described above, in the terrestrial digital broadcast receiving tuner 20 of the present embodiment, at least one or more input terminals 21 and the input signals from the input terminals 21 are frequency-parallelized to the first intermediate frequency. At least one or more of the at least two or more first frequency conversion circuit units 26a and 26b to be converted and at least one of the first intermediate frequencies output from each of the first frequency conversion circuit units 26a and 26b. Second frequency conversion circuit unit 3 for converting to an intermediate frequency of 2
And 3a and 33b. Then, the first frequency conversion circuit units 26a and 26b and the second frequency conversion circuit units 33a and 33b output the respective intermediate frequency signals in parallel to the outside of the tuner.

Therefore, at least two double conversion systems for performing frequency conversion twice can be incorporated in the terrestrial digital broadcast reception tuner 20.

As a result, one tuner 20 for receiving terrestrial digital broadcasting receives two different terrestrial digital broadcasting in parallel, thereby providing a tuner 20 for receiving terrestrial digital broadcasting, which is low in power consumption, small in size, and inexpensive. be able to.

Further, in the terrestrial digital broadcast receiving tuner 20 of the present embodiment, the second frequency conversion circuit section 33 is used.
When there are a plurality of a-33b, the second local oscillation circuit sections 35a and 35b used for the second frequency conversion circuit sections 33a and 33b can be shared, so that the number of parts can be reduced. Therefore, the tuner 2 for receiving the terrestrial digital broadcasting, which is further low in power consumption, compact, and inexpensive
0 can be provided.

[Third Embodiment] The following will describe another embodiment of the present invention with reference to FIG. For convenience of description, members having the same functions as the members shown in the drawings of the first and second embodiments are given the same reference numerals and the description thereof will be omitted.

As shown in FIG. 3, the tuner 40 for receiving digital broadcast of the present embodiment is provided with one single conversion system and one up-down system in the double conversion system.

In the digital broadcast receiving tuner 40, as shown in the same figure, the input terminal 21 is used. In the terrestrial digital broadcast receiving tuner 40 of the present embodiment, the input is made from the input terminal 41 as shown in FIG. The signal is amplified by the RF amplifier 42 and then distributed by a distributor 43 such as a Y distributor.
Signals are distributed at.

One side of the above signal distribution is band-pass filtered by a band pass filter 44a, level-controlled to a predetermined level by an RF gain controller 45a, and frequency converted to an intermediate frequency signal, for example 57 MHz, by a frequency conversion circuit section 46a. To be done.

The frequency conversion circuit section 46a includes a mixer circuit section 47a, a local oscillation circuit section 48a, and a PLL circuit section 49 for frequency controlling the local oscillation circuit section 48a.
a.

The intermediate frequency signal frequency-converted by the frequency conversion circuit section 46a is the bandpass filter 51a.
IF gain controller 52 after band-pass filtering at
The level is again controlled by a, the level is amplified by the IF amplifier 53a, and output to the IF output terminal 54a.

On the other hand, the other side to which the signal is distributed by the distributor 432 is band-pass filtered by the band pass filter 44b and level-controlled to a predetermined level by the RF gain controller 45b. In the unit 46b, the frequency is converted into a first intermediate frequency signal having a frequency higher than the RF frequency, for example, about 1.2 GHz.

The first frequency conversion circuit section 46b includes a first mixer circuit section 47b, a first local oscillation circuit section 48b, and a PLL circuit section 49b for frequency controlling the first local oscillation circuit section 48b. Become.

The first intermediate frequency signal frequency-converted by the first frequency conversion circuit section 46b is band-pass filtered by the band-pass filter 51b, level-amplified by the IF amplifier 61, and then band-pass filtered. 62
After being band-pass filtered again at, the second frequency conversion circuit unit 63 outputs a second intermediate frequency signal, for example, 57 MH.
The frequency is converted to about z.

The second frequency conversion circuit section 63 has a second
Mixer circuit section 64 and second local oscillation circuit section 65
Consists of. The second intermediate frequency signal frequency-converted by the second frequency conversion circuit unit 63 is band-filtered by the band-pass filter 66, level-controlled by the IF gain controller 52b, and then the IF amplifier 53b is controlled. The level is amplified and output to the IF output terminal 54b.

The IF output terminals 54a and 54b are OF
The terrestrial digital signal and the terrestrial analog signal can be received in parallel by inputting to the DM demodulation circuit or the analog demodulation circuit.

As described above, in the terrestrial digital broadcast receiving tuner 40 of the present embodiment, the input signal from the input terminal 41 is distributed by the distributor 43, and one of the distributed signals has the first frequency. 30 in the conversion circuit unit 46a
The frequency is converted to a first intermediate frequency of -60 MHz and the first intermediate frequency signal is output to the outside of the tuner. On the other hand, while the signal is distributed by the distributor 43,
In the other first frequency conversion circuit unit 46b, 1 GHz to 1.
The frequency is converted into the first intermediate frequency of 5 GHz, and the first intermediate frequency signal is converted into the second frequency conversion circuit unit 63.
And frequency-converts it to a second intermediate frequency of 0 to 60 MHz and outputs the second intermediate frequency signal to the outside of the tuner.

Therefore, on the other hand, the single conversion system which performs frequency conversion only once and the up-down system which is one system in the double conversion system which performs frequency conversion twice are arranged in the tuner 40 for receiving terrestrial digital broadcasting. Can be visceral.

[Embodiment 4] The following will describe another embodiment of the present invention in reference to FIG. For convenience of explanation, members having the same functions as those shown in the drawings of the first to third embodiments are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 4, the tuner 70 for receiving digital broadcasting of the present embodiment is provided with one Low-IF system in the double conversion system and one up-down system in the double conversion system. Has become.

In the digital broadcast receiving tuner 70, as shown in the figure, the signal input from the input terminal 71 is amplified by the RF amplifier 72, and then the signal is output by the distributor 73 such as a Y distributor. To be distributed.

One side of the above signal distribution is band-pass filtered by the band pass filter 74a, level-controlled to a predetermined level by the RF gain controller 75a, and the first intermediate frequency by the first frequency conversion circuit section 76a. The signal is frequency-converted to, for example, 57 MHz.

The first frequency conversion circuit section 76a includes a first mixer circuit section 77a, a first local oscillation circuit section 78a, and a PLL circuit section 79a that controls the frequency of the first local oscillation circuit section 78a. Become.

The first intermediate frequency signal frequency-converted by the first frequency conversion circuit section 76a is band-pass filtered by the band pass filter 81a, and then level-controlled again by the IF gain controller 82a. In the second frequency conversion circuit unit 83a, the second intermediate frequency signal, for example, 4M
The frequency is converted to about Hz. The frequency conversion circuit section 8
3a comprises a mixer circuit section 84a and a second local oscillation circuit section 85a.

The second intermediate frequency signal frequency-converted by the second frequency conversion circuit section 83a is band-pass filtered by the low-pass filter 86a, level-amplified by the IF amplifier 87a, and the IF output terminal 88a. Is output to.

On the other hand, the other side to which the signal is distributed by the distributor 73 is band-pass filtered by the band pass filter 74b and level-controlled to a predetermined level by the RF gain controller 75b. R at 76b
The frequency is converted into a first intermediate frequency signal having a frequency higher than the F frequency, for example, about 1.2 GHz.

The first frequency conversion circuit section 76b includes a first mixer circuit section 77b, a first local oscillation circuit section 78b, and a PLL circuit section 79b0 which controls the frequency of the first local oscillation circuit section 78b. Become.

The first intermediate frequency signal frequency-converted by the first frequency conversion circuit section 76b is band-pass filtered by the band-pass filter 81b, level-amplified by the IF amplifier 91, and then the band-pass filter. 92
After being band-filtered again in, the second frequency conversion circuit unit 83b outputs a second intermediate frequency signal, for example, 57M.
The frequency is converted to about Hz.

The second frequency conversion circuit section 83b includes a second mixer circuit section 84b and a second local oscillation circuit section 85b.

The second intermediate frequency signal frequency-converted by the second frequency conversion circuit section 83b is band-pass filtered by the band-pass filter 86b, and then level-controlled by the IF gain controller 93 to obtain the IF signal. The level is amplified by the amplifier 87b and then output to the IF output terminal 88b.

The IF output terminals 88a and 88b are OF
The terrestrial digital signal and the terrestrial analog signal can be received in parallel by inputting to the DM demodulation circuit or the analog demodulation circuit.

As described above, in the terrestrial digital broadcast receiving tuner 70 of the present embodiment, the input signal from the input terminal 71 is signal-distributed by the distributor, and one of the signal-distributed signals has the first frequency conversion. 30 to 6 in the circuit section 76a
The frequency is converted to a first intermediate frequency of 0 MHz, and the first intermediate frequency signal is converted to a second frequency conversion circuit unit 83a.
And frequency-converts it to a second intermediate frequency of 0 to 10 MHz and outputs the second intermediate frequency signal to the outside of the tuner. On the other hand, on the other hand, the signal is distributed by the distributor 73, and on the other hand, 1 GHz-
The frequency is converted to a first intermediate frequency of 1.5 GHz, and the first intermediate frequency signal is converted to a second intermediate frequency of 0 to 60 MHz by another second frequency conversion circuit unit 83b. The second intermediate frequency signal is output from the tuner.

Therefore, on the other hand, Lo, which is another method in the double conversion method in which frequency conversion is performed twice, is performed.
The w-IF system and, on the other hand, the up-down system, which is one of the double conversion systems in which frequency conversion is performed twice, can be incorporated in the terrestrial digital broadcast receiving tuner 70.

[Fifth Embodiment] The following will describe another embodiment of the present invention in reference to FIG. For convenience of explanation, members having the same functions as the members shown in the drawings of the first to fourth embodiments will be designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 5, the digital broadcast receiving tuner 100 of the present embodiment is similar to that of the first embodiment shown in FIG.
In addition to the terrestrial digital broadcast receiving tuner 10 provided with two single conversion systems shown in (1), an analog demodulation circuit and an OFDM demodulation circuit are further provided respectively.

In the above-mentioned tuner 100 for receiving terrestrial digital broadcasting, as shown in the figure, the operation until converting to an intermediate frequency signal is the same as that in the first embodiment shown in FIG. Since it is the same as the tuner 10 for use, description thereof will be omitted.

In this embodiment, the frequency-converted intermediate frequency signal, eg, 57 MHz or 36.167 MHz, is input to the analog demodulation circuit section 101 and the OFDM demodulation circuit section 104 as an OFDM demodulation section.

From the analog demodulation circuit section 101, the video output terminal 102 and the audio output terminal 1 are connected.
A signal is output to 03. In addition, the OFDM demodulation circuit unit 1
From 04, a signal is output to the TS (transport) output terminal 105, and a terrestrial digital signal and a terrestrial analog signal can be received in parallel.

As described above, in the terrestrial digital broadcast reception tuner 100 of the present embodiment, the OFDM demodulation circuit section 104 for digitally processing the intermediate frequency signals output in parallel is output in parallel. Only one less than the number of the two second frequency signals is provided.

Therefore, the OFDM demodulation circuit section 104 can perform OFDM demodulation processing on the digital signal.

Further, since the terrestrial digital broadcast receiving tuner 100 of this embodiment is provided with at least one analog demodulation circuit section 101, analog demodulation can be performed by this analog demodulation circuit section 101. it can.

Further, in the terrestrial digital broadcast reception tuner 100 of this embodiment, the OFDM demodulation circuit section 104 is used.
Is provided with a reference oscillator (not shown) such as a crystal, and the signal of the reference oscillator and the signal obtained by multiplying or dividing the signal of the reference oscillator are, for example, the second frequency of the fourth embodiment. It can be shared with the signal of the second local oscillation circuit unit 85b used for the conversion circuit unit 83b. Therefore, the number of parts can be reduced. Therefore, it is possible to provide the tuner 100 for receiving terrestrial digital broadcasting, which is further low in power consumption, small in size, and inexpensive.

The present invention is not limited to the above-described embodiments, but various modifications can be made within the scope of the claims, and the technical means disclosed in the different embodiments can be appropriately used. Embodiments obtained in combination are also included in the technical means of the present invention.

For example, the terrestrial digital broadcast receiving tuners 10, 20, 40, 70, 100 according to the first to fifth embodiments.
Then, from the frequency conversion circuit units 6a and 6b or the first frequency conversion circuit units 46a and 46b to the second frequency conversion circuit unit 6
3, or separate the ground pattern on each board from the first frequency conversion circuit unit 76a / 76b to the second frequency conversion circuit unit 83a / 83b, the OFDM demodulation circuit unit 104, or the analog demodulation circuit unit 101. Is possible.

For this reason, it is difficult for the two local signals to interfere with each other. Therefore, the terrestrial digital broadcast reception tuner 10, 20, 40, which can prevent deterioration of reception performance
70/100 can be provided.

In addition, in the terrestrial digital broadcast receiving tuner 10, 20, 40, 70, 100 of the present embodiment,
From the frequency conversion circuit sections 6a and 6b or the first frequency conversion circuit sections 46a and 46b to the second frequency conversion circuit section 63, or from the first frequency conversion circuit sections 76a and 76b to the second
The frequency conversion circuit units 83a and 83b, the OFDM demodulation circuit unit 104, or the analog demodulation circuit unit 101 are accommodated in the same chassis.

Therefore, furthermore, the terrestrial digital broadcast receiving tuners 10 and 20 capable of preventing the deterioration of the receiving performance.
・ 40, 70, 100 can be provided.

[0135]

As described above, the tuner for receiving terrestrial digital broadcasting of the present invention has at least one or more input terminals and at least two tuners for converting the input signals from the input terminals in parallel to an intermediate frequency. The above-described frequency conversion circuit section is provided, and the at least two or more frequency conversion circuit sections output the respective intermediate frequency signals in parallel to the outside of the tuner.

Therefore, at least two single conversion systems that perform frequency conversion only once and / or double conversion systems that perform frequency conversion twice can be incorporated in the terrestrial digital broadcast reception tuner.

As a result, by receiving two different terrestrial digital broadcasts in parallel with one terrestrial digital broadcast tuner, it is possible to provide a terrestrial digital broadcast receiving tuner with low power consumption, small size, and low cost. It has the effect of being able to.

As described above, the tuner for receiving terrestrial digital broadcasting of the present invention frequency-converts at least one or more input terminals and the input signals from the input terminals in parallel to the first intermediate frequency. At least two of the first frequency conversion circuit units and at least one of the first intermediate frequencies output from the first frequency conversion circuit units described above.
And a second frequency conversion circuit unit for converting two or more intermediate frequency signals into a second intermediate frequency, wherein the first frequency conversion circuit unit and the second frequency conversion circuit unit parallelly convert the respective intermediate frequency signals. It is output to the outside of the tuner.

Therefore, at least two double conversion systems for performing frequency conversion twice can be built in the tuner for receiving terrestrial digital broadcasting.

As a result, by receiving two different terrestrial digital broadcasts in parallel with one terrestrial digital broadcast tuner, it is possible to provide a terrestrial digital broadcast receiving tuner with low power consumption, small size, and low cost. It has the effect of being able to.

The terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein an input signal from one input terminal is converted into at least two or more frequency conversion circuit sections or at least two or more frequency conversion circuit sections. For example, a distributor such as a Y distributor that distributes to two or more first frequency conversion circuit units is provided.

Therefore, there is an effect that the input signal can be distributed by the distributor such as the Y distributor.

The terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein an input signal from the input terminal is signal-distributed by a distributor, and one of the signal-distributed tuners is , The first frequency conversion circuit section performs frequency conversion to a first intermediate frequency of 30 to 60 MHz and outputs the first intermediate frequency signal to the outside of the tuner, while the signal is distributed by the distributor. 1 GHz in another first frequency conversion circuit unit
Frequency conversion to a first intermediate frequency of ˜1.5 GHz and frequency conversion of the first intermediate frequency signal to a second intermediate frequency of 0 to 60 MHz by the second frequency conversion circuit section. The second intermediate frequency signal is output to the outside of the tuner.

Therefore, on the other hand, a single conversion system that performs frequency conversion only once and an up-down system, which is one of the double conversion systems that performs frequency conversion twice, are installed in the terrestrial digital broadcast reception tuner. It has the effect of being able to have internal organs.

The terrestrial digital broadcast reception tuner of the present invention is the above-mentioned terrestrial digital broadcast reception tuner, in which the input signal from the input terminal is distributed by a distributor, and one of the distributed signals is , The first frequency conversion circuit section performs frequency conversion into a first intermediate frequency of 30 to 60 MHz, and the first intermediate frequency signal is converted into a second intermediate frequency signal.
In the frequency conversion circuit section of the above, the frequency is converted to the second intermediate frequency of 0 to 10 MHz and the second intermediate frequency signal is output to the outside of the tuner. 1G in 1 frequency conversion circuit
Frequency is converted to a first intermediate frequency of Hz to 1.5 GHz, and the first intermediate frequency signal is frequency converted to a second intermediate frequency of 0 to 60 MHz by another second frequency conversion circuit unit. The second intermediate frequency signal is output from the tuner.

Therefore, on the other hand, Low, which is another method in the double conversion method in which frequency conversion is performed twice, is performed.
-The IF system and the up-down system, which is one of the double conversion systems in which frequency conversion is performed twice, can be incorporated in the tuner for receiving terrestrial digital broadcasting.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the terrestrial digital broadcast receiving tuner, wherein the second frequency converting circuit has a plurality of second frequency converting circuit sections. The second local oscillating circuit section used for the section is shared.

Therefore, since the second local oscillation circuit section used in the second frequency conversion circuit section is shared, the number of parts can be reduced. Therefore, there is an effect that it is possible to provide a tuner for receiving terrestrial digital broadcasting which is further low in power consumption, small in size, and inexpensive.

The terrestrial digital broadcast receiving tuner of the present invention is the above-mentioned terrestrial digital broadcast receiving tuner, wherein the plurality of first intermediate frequency signals or second intermediate frequency signals output in parallel are provided. An OFDM demodulation unit for digital signal processing is provided by less than the number of the plurality of first intermediate frequency signals or second frequency signals output in parallel.

Therefore, the OFDM demodulator can perform OFDM demodulation processing on the digital signal.

The terrestrial digital broadcast receiving tuner of the present invention is, in the terrestrial digital broadcast receiving tuner, at least for analog signal processing the first intermediate frequency signal or the second intermediate frequency signal. One or more analog demodulation circuit units are provided.

Therefore, since at least one analog demodulation circuit section is provided, the analog demodulation circuit section can perform analog demodulation.

Further, the terrestrial digital broadcast receiving tuner of the present invention is the above terrestrial digital broadcast receiving tuner, wherein the OFDM demodulation section is provided with a reference oscillator, and the reference oscillator signal, And a signal obtained by multiplying or dividing the signal of the reference oscillator by the second
It is also used as a signal of the second local oscillation circuit used in the frequency conversion circuit section.

Therefore, the signal of the reference oscillator and the signal obtained by multiplying or dividing the signal of the reference oscillator are shared as the signal of the second local oscillation circuit used in the second frequency conversion circuit section. The number of parts can be reduced. Therefore, there is an effect that it is possible to provide a tuner for receiving terrestrial digital broadcasting which is further low in power consumption, small in size, and inexpensive.

Further, the terrestrial digital broadcast reception tuner of the present invention is the above-mentioned terrestrial digital broadcast reception tuner, wherein the frequency conversion circuit section or the first frequency conversion circuit section to the second frequency conversion circuit section, The ground pattern on each board up to the OFDM demodulation section or the analog demodulation circuit section is separated.

Therefore, it becomes difficult for the two local signals to interfere with each other. Therefore, it is possible to provide a terrestrial digital broadcast reception tuner capable of preventing deterioration of reception performance.

Further, the terrestrial digital broadcast reception tuner of the present invention is the above-mentioned terrestrial digital broadcast reception tuner, wherein the frequency conversion circuit unit or the first frequency conversion circuit unit to the second frequency conversion circuit unit, The OFDM demodulation unit or the analog demodulation circuit unit is housed in the same chassis.

Therefore, there is an effect that it is possible to provide a tuner for receiving terrestrial digital broadcasting which can prevent deterioration of reception performance.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a terrestrial digital broadcast receiving tuner according to the present invention, and showing a terrestrial digital broadcast receiving tuner provided with two single conversion systems.

FIG. 2 is a block diagram showing another embodiment of a tuner for receiving terrestrial digital broadcasting according to the present invention, showing a tuner for receiving terrestrial digital broadcasting having two Low-IF systems in the double conversion system. It is a figure.

FIG. 3 shows still another embodiment of a tuner for receiving terrestrial digital broadcasting according to the present invention, which includes one single conversion system and one up-down system in the double conversion system. It is a block diagram which shows the tuner for wave digital broadcasting reception.

FIG. 4 shows still another embodiment of the tuner for receiving terrestrial digital broadcasting according to the present invention, in which one Low-IF system in the double conversion system and one up-down system in the double conversion system are provided. FIG. 3 is a block diagram showing a terrestrial digital broadcast reception tuner including and.

FIG. 5 shows still another embodiment of the tuner for receiving terrestrial digital broadcasting according to the present invention, which is different from the tuner for receiving terrestrial digital broadcasting shown in FIG. FIG. 3 is a block diagram showing a terrestrial digital broadcast receiving tuner that further includes an analog demodulation circuit and an OFDM demodulation circuit, respectively.

FIG. 6 is a block diagram showing a terrestrial digital broadcast receiving tuner in a conventional single conversion system.

FIG. 7 is a block diagram showing a terrestrial digital broadcast receiving tuner in an up-down system, which is one of the conventional double conversion systems.

FIG. 8 is a block diagram showing a terrestrial digital broadcast receiving tuner in a Low-IF system, which is one of the conventional double conversion systems.

FIG. 9 is a block diagram showing a terrestrial digital broadcast receiving tuner provided with two tuners in a conventional single conversion system.

FIG. 10 is a block diagram showing a state where each tuner receives a signal from an independent antenna in the terrestrial digital broadcast receiving tuner provided with two tuners in the single conversion system.

[Explanation of symbols]

1 Input Terminal 3 Distributor 6a Frequency Conversion Circuit Unit 6b Frequency Conversion Circuit Unit 7a Mixer Circuit Unit (Mixer Circuit) 7b Mixer Circuit Unit (Mixer Circuit) 8a Local Oscillation Circuit (Local Oscillation Circuit) 8b Local Oscillation Circuit (Local Oscillation Circuit) 9a PLL circuit section (PLL circuit) 9b PLL circuit section (PLL circuit) 10 Terrestrial digital broadcast reception tuner 20 Terrestrial digital broadcast reception tuner 21 Input terminal 23 Distributor 26a First frequency conversion circuit section 26b First Frequency conversion circuit unit 27a First mixer circuit unit (first mixer circuit) 27b First mixer circuit unit (first mixer circuit) 28a First local oscillation circuit (first local oscillation circuit) 28b First Local oscillator circuit (first local oscillator circuit) 29a PLL circuit unit (PLL Circuit 29b PLL circuit section (PLL circuit) 33a Second frequency conversion circuit section 33b Second frequency conversion circuit section 34a Second mixer circuit section (second mixer circuit) 34b Second mixer circuit section (second) 35a Second local oscillator circuit (second local oscillator circuit) 35b Second local oscillator circuit (second local oscillator circuit) 40 Terrestrial digital broadcast reception tuner 41 Input terminal 43 Distributor 46a First frequency conversion circuit unit 46b First frequency conversion circuit unit 47a First mixer circuit unit (first mixer circuit) 47b First mixer circuit unit (first mixer circuit) 48a First local oscillation circuit ( First local oscillator circuit) 48b First local oscillator circuit (first local oscillator circuit) 49a PLL circuit unit (PLL circuit) 49b PLL circuit section (PLL circuit) 63 Second frequency conversion circuit section 64 Second mixer circuit section (second mixer circuit) 65 Second local oscillator circuit (second local oscillator circuit) 70 Terrestrial digital broadcasting Reception tuner 71 Input terminal 73 Distributor 76a First frequency conversion circuit section 76b First frequency conversion circuit section 77a First mixer circuit section (first mixer circuit) 77b First mixer circuit section (first Mixer circuit) 78a first local oscillator circuit (first local oscillator circuit) 78b first local oscillator circuit (first local oscillator circuit) 79a PLL circuit unit (PLL circuit) 79b PLL circuit unit (PLL circuit) 83a Second frequency conversion circuit unit 83b Second frequency conversion circuit unit 84a Second mixer circuit unit (second mixer circuit) 84b Second mixer circuit section (second mixer circuit) 85a Second local oscillator circuit (second local oscillator circuit) 85b Second local oscillator circuit (second local oscillator circuit) 100 For receiving terrestrial digital broadcasting Tuner 101 Analog demodulation circuit unit 104 OFDM demodulation circuit unit (OFDM demodulation unit)

Claims (11)

[Claims] 1. A terrestrial digital reception tuner comprising a frequency conversion circuit section comprising a local oscillation circuit, a mixer circuit and a PLL circuit for frequency converting a signal inputted from an input terminal into an intermediate frequency signal, at least one of which is provided. The above-mentioned input terminal and at least two or more frequency conversion circuit sections for frequency-converting an input signal from the input terminal in parallel to an intermediate frequency are provided, and the at least two or more frequency conversion circuit sections are arranged in parallel. A tuner for digital terrestrial reception, which outputs each intermediate frequency signal to the outside of the tuner. 2. A first frequency conversion circuit section comprising a first local oscillation circuit, a first mixer circuit, and a PLL circuit, which frequency-converts a signal input from an input terminal into a first intermediate frequency signal, For terrestrial digital reception, including a second frequency conversion circuit unit including a second local oscillation circuit and a second mixer circuit, which frequency-converts the first intermediate frequency signal into a second intermediate frequency signal. In the tuner, at least one or more input terminals, at least two or more first frequency conversion circuit sections for frequency-converting an input signal from the input terminals in parallel to a first intermediate frequency, and each of the first Each first output from the frequency conversion circuit unit of
A second frequency conversion circuit unit for converting at least one or more of the intermediate frequencies of the second frequency conversion circuit unit to a second intermediate frequency, wherein the first frequency conversion circuit unit and the second frequency conversion circuit unit are parallel. A tuner for terrestrial digital reception, characterized in that it outputs each intermediate frequency signal to the outside of the tuner. 3. An input signal from one input terminal is supplied to the at least two or more frequency conversion circuit sections or at least two.
The tuner for digital terrestrial reception according to claim 1 or 2, further comprising a distributor for distributing to one or more first frequency conversion circuit units. 4. An input signal from the input terminal is distributed by a distributor, and one of the distributed signals is frequency converted into a first intermediate frequency of 30 to 60 MHz by a first frequency conversion circuit section. The first intermediate frequency signal is output to the outside of the tuner while the signal is distributed by the distributor, while the other first
1GHz-1.5GHz in the frequency conversion circuit part of
Frequency conversion of the first intermediate frequency signal to the intermediate frequency of 0 to 60 MHz by the second frequency conversion circuit unit.
4. The tuner for terrestrial digital reception according to claim 2 or 3, wherein the second intermediate frequency signal is converted to a second intermediate frequency signal and the second intermediate frequency signal is output to the outside of the tuner. 5. An input signal from the input terminal is signal-distributed by a distributor, and one of the signal-distributed signals is frequency-converted to a first intermediate frequency of 30 to 60 MHz by a first frequency conversion circuit section. And, the first intermediate frequency signal is frequency-converted by the second frequency conversion circuit unit into a second intermediate frequency of 0 to 10 MHz, and the second intermediate frequency signal is output to the outside of the tuner. On the other hand, the other
1GHz-1.5GHz in the frequency conversion circuit part of
Frequency conversion to an intermediate frequency of 0 to 60M in another second frequency conversion circuit unit.
The tuner for terrestrial digital reception according to claim 2 or 3, wherein the tuner converts the second intermediate frequency signal into a second intermediate frequency of Hz and outputs the second intermediate frequency signal. 6. The second frequency conversion circuit unit, wherein when a plurality of the second frequency conversion circuit units are present, the second frequency conversion circuit unit is used for the second frequency conversion circuit unit.
3. The terrestrial digital reception tuner according to claim 2, wherein the local oscillation circuit section is shared. 7. An OFDM demodulator for digitally processing the plurality of first intermediate frequency signals or the second intermediate frequency signals output in parallel, wherein the plurality of first OFDM signals output in parallel are provided. 7. The tuner for terrestrial digital reception according to any one of claims 1 to 6, wherein the tuner is provided with less than the number of intermediate frequency signals or second frequency signals. 8. The at least one analog demodulation circuit section for analog signal processing the first intermediate frequency signal or the second intermediate frequency signal is provided. Tuner for digital terrestrial reception. 9. The OFDM demodulator is provided with a reference oscillator, and a signal of the reference oscillator and a signal obtained by multiplying or dividing the signal of the reference oscillator are used for the second frequency conversion circuit unit. 8. The terrestrial digital reception tuner according to claim 7, which is also used as a signal of the second local oscillation circuit used for the above. 10. The ground pattern on each board from the frequency conversion circuit unit or the first frequency conversion circuit unit to the second frequency conversion circuit unit, the OFDM demodulation unit or the analog demodulation circuit unit is separated. The tuner for terrestrial digital reception according to any one of claims 1 to 9. 11. The frequency conversion circuit unit or the first frequency conversion circuit unit to the second frequency conversion circuit unit, the OFDM demodulation unit or the analog demodulation circuit unit are housed in the same chassis. The tuner for terrestrial digital reception according to any one of claims 1 to 9.