JP3141720B2 - Card type electronic tuner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a card-type electronic tuner for receiving digital broadcasts and digital communications on a personal computer or the like by using a slot of a memory card or the like used in a personal computer or the like.

[0002]

2. Description of the Related Art A conventional card-type electronic tuner will be described below with reference to the drawings. As shown in FIG. 22, a conventional card-type electronic tuner has a signal input terminal 1 to which a high-frequency signal is input, a signal supplied from the signal input terminal 1 supplied to one input, and a local oscillator 2 provided to the other input. , An analog demodulator 4 to which the output of the mixer 3 is connected, an output terminal 5 to which the output of the analog demodulator 4 is connected, and an output of the local oscillator 2. A PLL circuit 6 connected to one input and having an output connected to the input of the local oscillator 2 and a data input terminal 7 to which a data signal is supplied to the PLL circuit 6 are provided. It is mounted on a card type case 8, and the signal input terminal 1, the output terminal 5, and the data input terminal 7 of the high frequency signal are provided on one lateral side of the case 8.

[0003] The card-type electronic tuner constructed as described above is inserted into a personal computer or the like so that digital processing can be performed by the personal computer. I was

[0004] As a technique similar to this, there is, for example, Japanese Patent Application Laid-Open No. 5-14133.

[0005]

However, in such a conventional configuration, since the demodulator 4 is dedicated to analog broadcasting, recent demodulated broadcasts and communications (hereinafter referred to as broadcasts) are received and demodulated. I couldn't. On the other hand, for the multimedia age, digitally modulated broadcasting and information communication are closing the barrier. In order to perform multifaceted information processing using digital signals in one terminal, for example, a personal computer or the like, there is an increasing demand for receiving digitally modulated broadcasts or the like. At this time, it is desirable that the modification of the personal computer or the like accompanying this is as small as possible. SUMMARY OF THE INVENTION It is an object of the present invention to provide a card-type electronic tuner that can receive digitally modulated broadcasts and the like and does not require hardware modification.

[0006]

In order to achieve this object, a card-type electronic tuner according to the present invention provides a signal input terminal to which a high-frequency signal is input, and a signal from the signal input terminal to one input. A mixer to which the output of the local oscillator is supplied to the other input, an output terminal to which an output signal of the mixer is supplied, and an output of the local oscillator connected to one input and the output A PLL circuit connected to the input of the local oscillator and a data input terminal to which a data signal is supplied to the PLL circuit are mounted on a card type case, and the output terminal and the data input terminal are connected to one side of the case. Provided on the side, and opposed to this side
The signal input terminal is provided on the lateral side of
And a digital signal processing means having at least one of an extracting means or an A / D converter is provided between the mixer and the output terminal.

[0007]

According to this structure, since the digital signal processing means having at least one of the extraction means or the A / D converter is provided between the mixer and the output terminal, the digitally modulated broadcast or the like is received as it is. The data can be taken into a personal computer or the like. Also,
The signal input terminal faces the output terminal or the data input terminal.
On the other side, that is, on the back of the card-type electronic tuner.
High-frequency signal directly to the signal input terminal.
Can be Therefore, such as personal computers
There is no need to introduce a high-frequency signal inside again. That is,
C to add an antenna to a personal computer, etc.
Digitally modulated broadcasts without modifying the hardware
Transmission and the like can be received.

Further, since the external shape of the card type electronic tuner is a card type case, the slot of the memory card can be used as it is, and there is no need to modify hardware such as a personal computer.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 4 shows a first embodiment of the present invention. In FIG. 4, the electric circuit of the card-type electronic tuner of the present invention has a signal input terminal 1 to which a high-frequency signal is input.
11, a mixer 113 in which the signal of the signal input terminal 111 is supplied to one input and the other input is connected to the output of the local oscillator 112, and a digital signal to which the output of the mixer 113 is connected. Extraction means 114,
A low-pass filter (not shown) to which the output of the extracting means 114 is connected, a demodulator 115 using an analog circuit connected to the low-pass filter, and a demodulator 115
, An output terminal 117 to which the output of the error correction circuit 116 is connected, and the output of the local oscillator 112 connected to one input and the output of the local oscillator 112 , A data input terminal 119 to which a data signal is supplied to the PLL circuit 118, a power supply input terminal 120, and a power supply input terminal 120 provided between the power supply input terminal 120 and the PLL circuit 118. DC-DC converter 12
One.

The operation of the card-type electronic tuner configured as described above will be described below.

The high-frequency signal input to the signal input terminal 111 is tuned by the mixer 113 and the local oscillator 112 to have an intermediate frequency. This intermediate frequency is demodulated into a signal form that can be digitally processed by the digital signal extracting means 114, low-pass filter, and demodulator 115. That is, the digitally modulated broadcast wave is represented by, for example, a cosine wave (hereinafter, a case using a cosine wave) as shown in (Equation 1). Here, assuming that the information “0” has a phase difference of 0, the information “1” has a phase delayed by 180 degrees as compared with “0”. The fact that the phase is delayed by 180 degrees means that
As shown in (Equation 2), a negative sign is given to the cosine wave having the phase difference of 0. That is, “0” and “1” are (Equation 3)
Can be expressed as a cosine wave with positive and negative signs.

[0013]

(Equation 1)

[0014]

(Equation 2)

[0015]

(Equation 3)

In order to further increase the information amount, the phase difference can be assigned to 90 degrees and 270 degrees for other information "0" and "1". For convenience, a phase difference of 0 ° and 180 ° is an I signal, and 90 ° and 270 ° are a Q signal. The coordinate axes are mutually orthogonal axes due to the phase difference. The subsequent demodulation will be described assuming that the signal is on the I axis.

When the digitally modulated signal is input to the card-type electronic tuner, as shown in (Equation 4), the input signal is extracted by the extracting means 114 with the same frequency as that of the input signal. By multiplying the cosine wave,
A cosine wave having a constant term and twice the frequency of the original frequency is obtained. Here, by passing through the following low-pass filter,
By removing the double frequency, a constant term is obtained. This constant term is eventually a demodulated signal.

[0018]

(Equation 4)

However, a slight frequency shift or phase shift occurs between the cosine wave input here and the cosine wave generated by the extraction means 114. Therefore, in the next demodulator 115, the fundamental frequency of the cosine wave is extracted by an analog resonance circuit, and this signal is fed back to the extraction means 114 to correct the generated cosine wave correctly. As described above, in the present embodiment, since a conventional analog circuit can be used for the demodulator 115, the cost can be reduced. Also, as shown in FIG.
Uses an analog local oscillator, so that a high intermediate frequency (broadband signal) can be input. However, there is a limit to the response speed of the feedback loop. If the response speed is exceeded, synchronization is not achieved and the error rate increases. When a Q signal is also provided, it is separated into an I signal and a Q signal, and finally combined, so that it is inevitable that an error rate increases due to deterioration of orthogonal accuracy of the I axis and the Q axis. Therefore, even if the transmission speed is low, it is suitable for a practically small transmission capacity (for example, about 5 Kbps). An application product in this case is a digital mobile phone or the like.

The signal thus demodulated is then
The error correction circuit 116 corrects the error. The error-corrected signal is output from the output terminal 117 to the personal computer, where digital processing is performed in the personal computer.

Next, these circuits are mounted in a case 122 having a predetermined outer dimension as shown in FIG. This case 122 has the same outer dimensions as a memory card inserted into a personal computer. For example, the vertical dimension 123 is 85.6 mm and the horizontal dimension is 12
4 is 54.0 mm. In addition, height dimension 125
Has three types, the dimensions are 3.3mm and 5.0mm
And 10.5 mm. Here the height dimension is 10.5m
m, the horizontal dimension is 85.6 mm to a maximum of 135.
6 mm. In addition, there is a possibility that external dimensions other than those described above are determined. The outer surface of the case 122 is made of an insulating synthetic resin, and the inside is made of conductive metal plating. This metal plating is connected to the ground. As another configuration, a shield cover or a metal frame may be used instead of metal plating.

As described above, the card-type electronic tuner of the present invention has the same outer dimensions as a memory card, so that it can be directly inserted into a memory card insertion slot of a personal computer without changing hardware. . Therefore, digitally modulated broadcasts and the like can be received without changing the hardware of the personal computer.

Next, the circuit arrangement will be described with reference to FIG. In FIG. 5, one side surface 12 of the case 122 is shown.
6 is provided with an output terminal 117, a data input terminal 119, and a power supply input terminal 120. Then, when the case 122 is inserted into the memory card insertion slot, these terminals are engaged with a connector provided at the back of the slot to exchange signals with the personal computer. A signal input terminal 111 is provided on the other side surface 127 opposite to the one side surface 126. A rod antenna 128 is mounted on the signal input terminal 111. Instead of the rod antenna of the signal input terminal 111, a cable may be connected to an external antenna.

As described above, since the signal input terminal 111 is on the back of the case 122 of the card-type electronic tuner, a high-frequency signal can be directly connected to the signal input terminal 111. Therefore, it is not necessary to introduce a high-frequency signal into the personal computer again. That is, digitally modulated broadcasts and the like can be received by the personal computer without changing hardware such as adding an antenna to the personal computer.

A printed circuit board 129 is mounted inside the case 122. The printed circuit board 129 has circuits arranged as follows. Here, the internal antenna 130 may be provided near the signal input terminal 111 side. Further, a mixer 113 is provided near the signal input terminal 111, and a local oscillator 112 is provided near the mixer 113.
Further, in the vicinity of the power input terminal 120, the DC-DC converter 121 is partitioned by a partition plate 131 made of metal (other materials may be used as long as they have conductivity such as resin plating. The same applies hereinafter). Has been implemented. In the vicinity of the data input terminal 119, a PLL circuit 118 is mounted by being partitioned by a metal partition plate 132. Further, near the output terminal 117, an error correction circuit 116 partitioned by a metal partition 133, and a demodulator 115 partitioned by a metal partition 134 next to the section of the error correction circuit 116.
Extraction means 114 partitioned by a metal partition plate 135 is mounted next to the demodulator 115.

That is, the PLL circuit 118 is located near one vertical side surface 136 of the case 122 and
The digital signal processing means 137 comprising the demodulator 115 and the error correction circuit 116 is located near the other vertical side surface 138 of the case 122, and the distance between the PLL circuit 118 and the digital signal processing means 137 is is seperated.

As described above, in a card-type electronic tuner that receives a digitally modulated broadcast or the like, it is important to prevent the influence of the PLL circuit 118 from affecting the digital signal processing means 137. If the digital signal processing means 137 is arranged near the PLL circuit 118, normal digital processing cannot be performed due to the influence of the clock pulse of the PLL circuit 118.

Another circuit arrangement will be described with reference to FIG. In FIG. 6, case 138 (case 13)
8 has the same outer dimensions as the case 122. ), The output terminal 117 and the data input terminal 11
9 and a power input terminal 120 are provided. The signal input terminal 111 is also provided on the side 139 (not shown). The signal input terminal 111 may be provided on one vertical side surface 140 near the horizontal side surface 139.

Therefore, this case corresponds to a case where a high-frequency signal has already been input to the personal computer.

A printed circuit board 141 is mounted inside the case 138, and the printed circuit board 141 has circuits arranged as follows. Here, an internal antenna 130 is provided near the signal input terminal 111 side. The internal antenna 130 is connected to the signal input terminal 11
This is unnecessary when a high-frequency signal is input to 1.
Next, a DC-DC converter 121 is mounted near the power input terminal 120 by being partitioned by a metal partition plate 142. In the vicinity of the data input terminal 119, P
The LL circuit 118 is mounted by being partitioned by a metal partition plate 143. Further, an error correction circuit 116 partitioned by a metal partition 144 near the output terminal 117, and a metal partition 145 adjacent to the partition of the error correction circuit 116.
The demodulator 115 partitioned by the above-mentioned, and the extraction means 114 partitioned by the metal partition plate 146 are mounted next to the demodulator 115.

That is, also in this case, the PLL circuit 1
Numeral 18 is located near one vertical side surface 140 of the case 138, and the digital signal processing unit 137 composed of the extracting means 114, the demodulator 115 and the error correction circuit 116 is located near the other vertical side surface 147 of the case 138. , The PLL circuit 118 and the digital signal processing means 1
37 are far apart. The reason is the same as in the case of FIG.

In either FIG. 5 or FIG. 6, the PLL circuit 118 and the digital signal processing means 137 are each provided with a metal partition plate (132 and 143 or 133.134.1.
35 and 144, 145, 146). As described above, by separating the PLL circuit 118 and the digital signal processing means 137 with the metal partition plate, the degree of separation between the two circuits is improved, and the influence of the PLL circuit 118 on the digital signal processing means 137 can be reduced. Absent. Further, in both FIGS. 5 and 6, when components are integrated on one surface and a pattern or a printed resistor is formed on the other surface, the thickness can be further reduced.

FIG. 8 shows a case in which a multilayer printed circuit board 149 is mounted in a case 148 (the case 148 has the same outer dimensions as the case 122), a PLL circuit 118 is mounted on one surface thereof, and a digital signal is mounted on the other surface. Processing means 1
37 is a card-type electronic tuner equipped with 37. here,
Reference numeral 150 denotes a hole for adjusting an adjustment component such as a coil from the outside. FIG. 9 is a sectional view of a main part of the multilayer printed circuit board 149. Reference numeral 151 denotes an internal layer of the multilayer printed circuit board 149. The copper foil of the internal layer 151 is connected to ground,
The PLL circuit 118 and the digital signal processing means 137 are separated. It is also possible to use a double-sided printed board instead of the multilayer printed board 149. When components are mounted on both sides, it is preferable to mount the printed circuit board approximately at the center of the thickness of the case 148 from the viewpoint of space efficiency.

FIG. 10 shows a case 152 in which two printed boards 153 and 154 are stacked in two stages in a case 152 (the case 152 has the same outer dimensions as the case 122), and a PLL is mounted on one of the printed boards 153. This is a card-type electronic tuner having a circuit 118 mounted thereon and a digital signal processing means 137 mounted on the other printed circuit board 154.
Here, reference numeral 155 denotes a hole for adjusting an adjustment component such as a coil from the outside. Thus, the two printed circuit boards 1
53 and 154, each of which has a printed circuit board 15
3,154 with the component mounting side facing out,
18 and the digital signal processing means 137 are separated. Further, if the digital signal processing means 137 is divided into two parts, it is easy to develop the digital signal processing means 137 in accordance with the capacity of the digital signal, develop by destination, add other function options, and the like by replacing only the printed circuit board. If a partition plate is inserted between two printed circuit boards, interference can be reduced.

FIG. 11 is an explanatory diagram of the extracting means 114. FIG. 11A shows a one-axis extracting unit 114a.
1 (b) is a biaxial extraction means 114b for extracting orthogonal I and Q signals. The former is used for FSK and BPSK, and the latter is used for QPSK, QPR, QAM, and the like.

(Embodiment 2) FIG. 12 shows a second embodiment of the present invention. In FIG. 12, an electric circuit of the card-type electronic tuner of the present invention includes a signal input terminal 211 to which a high-frequency signal is input, a signal supplied to the signal input terminal 211 supplied to one input, and a local input supplied to the other input. Oscillator 21
213 to which the output of the mixer 21 is connected, and the mixer 21
3 is connected to the A / D converter 214, and the A / D converter 214
A demodulator 215 using a digital circuit to which the output of the D converter 214 is connected, an error correction circuit 216 connected to the output of the demodulator 215, and an output terminal 217 to which the output of the error correction circuit 216 is connected. , The local oscillator 21
2 is connected to one input and the output of the PLL circuit 2 is connected to the input of the local oscillator 212.
18, a data input terminal 219 to which a data signal is supplied to the PLL circuit 218, a power input terminal 220, and a DC-DC converter 221 provided between the power input terminal 220 and the PLL circuit 218. are doing.

The operation of the card-type electronic tuner configured as described above will be described below.

The high-frequency signal input to the signal input terminal 211 is selected by the mixer 213 and the local oscillator 212 to have an intermediate frequency. The information on the intermediate frequency is, for example, a cosine wave that is digitally modulated, and will be described below as a cosine wave. First, the cosine wave is finely divided as it is on the time axis, and is digitally converted by the A / D converter 214. Then, the digital information is directly taken into the demodulator 215 to digitally extract frequency and phase information, which is fed back to the A / D converter 214 as clock data for synchronous detection. The phase can be synchronously detected in the demodulator 215. In that case A /
The D converter 214 performs pseudo-synchronous detection in which only the frequency is synchronized. Since the cosine wave information is processed digitally as it is, there is little phase shift due to demodulation. In particular,
Since the signal is not divided into the I signal and the Q signal, the orthogonal accuracy of the IQ axis is good. Therefore, the error rate is low. Also, digital IC
It is considered that the circuit configuration is simple and suitable for miniaturization by using the technology of miniaturization. However, at present, the high-speed A / D converter 214 and the demodulator 215 that handle cosine wave information digitally as they are are expensive. At present, no clock frequency is sufficiently high. Therefore, the signal is limited to a low-frequency narrow-band signal. An example of a narrow band is a 6-MHz band CATV. In this case, 30
There is a transmission amount of Mbps. The demodulated signal thus obtained is then subjected to error correction by an error correction circuit 216. The error-corrected signal is output from the output terminal 217 to the personal computer, and digitally processed in the personal computer.

Next, the circuit arrangement will be described with reference to FIG. 13, a case 222 (case 222)
Has the same outer dimensions as the case 122. ), An output terminal 217 and a data input terminal 219 are provided on one side surface 226.
And a power input terminal 220. Then, when the case 222 is inserted into the memory card insertion slot, these terminals are fitted into a connector provided at the back of the slot to exchange signals with a personal computer. In addition, a signal input terminal 211 is provided on the other lateral side 227 facing the one lateral side 226. A rod antenna 228 is attached to the signal input terminal 211. Note that an external antenna may be used instead of the rod antenna 228.

As described above, since the signal input terminal 211 is on the back of the case 222 of the card-type electronic tuner, a high-frequency signal can be directly connected to the signal input terminal 211. Therefore, there is no need to introduce a high-frequency signal into the personal computer. That is, a digital broadcast or the like can be received by the personal computer without changing the hardware of the personal computer.

A printed circuit board 229 is mounted inside the case 222. The printed circuit board 229 has circuits arranged as follows. Here, the internal antenna 230 may be provided near the signal input terminal 211 side. Further, a mixer 213 is provided near the signal input terminal 211, and a local oscillator 212 is provided near the mixer 213.
In the vicinity of the power input terminal 220, a DC-DC converter 221 is mounted by being partitioned by a metal partition plate 231. In addition, P near the data input terminal 219
The LL circuit 218 is mounted by being partitioned by a metal partition plate 232. Further, an error correction circuit 216 partitioned by a metal partition plate 233 near the output terminal 217, and a metal partition plate 234 adjacent to the partition of the error correction circuit 216.
And an A / D converter 214 partitioned by a metal partition plate 235 next to the demodulator 215.
Has been implemented.

That is, the PLL circuit 218 is located in the vicinity of one vertical side surface 236 of the case 222 and the A / D converter 21
4, a demodulator 215 and an error correction circuit 216, the digital signal processing means 237 is located near the other vertical side surface 238 of the case 222, and the distance between the PLL circuit 218 and the digital signal processing means 237. Is away.

As described above, in a card-type electronic tuner for receiving a digital broadcast, it is important that the influence of the PLL circuit 218 is not given to the digital signal processing means 237. If the digital signal processing means 2
If the 37 is arranged near the PLL circuit 218, normal digital processing cannot be performed due to the influence of the clock pulse of the PLL circuit 218.

Another circuit arrangement will be described with reference to FIG. 14, an output terminal 217, a data input terminal 219, and a power input terminal 220 are provided on one lateral side 240 of a case 239 (the case 239 has the same outer dimensions as the case 122). The signal input terminal 211 is also provided on the side surface 240 (not shown). The signal input terminal 211
May be provided on one vertical side 241 near the horizontal side 240.

Therefore, this case corresponds to a case where a high-frequency signal has already been input to the personal computer.

A printed circuit board 242 is mounted inside the case 239, and the printed circuit board 242 has circuits arranged as follows. Here, an internal antenna 230 is provided near the signal input terminal 211 side. The internal antenna 230 is connected to the signal input terminal 21.
This is unnecessary when a high-frequency signal is input to 1.
Next, a DC-DC converter 221 is mounted near the power input terminal 220 by being partitioned by a metal partition plate 243. In addition, P near the data input terminal 219
The LL circuit 218 is mounted by being partitioned by a metal partition plate 244. Further, an error correction circuit 216 partitioned by a metal partition plate 245 is provided near the output terminal 217, and a metal partition plate 246 is provided next to the partition of the error correction circuit 216.
And an A / D converter 214 partitioned by a metal partition plate 247 next to the demodulator 215.
Has been implemented.

That is, also in this case, the PLL circuit 2
Reference numeral 18 denotes a digital signal processing unit 237 which is located near one vertical side surface 241 of the case 239 and includes an A / D converter 214, a demodulator 215, and an error correction circuit 216.
Is located near the other vertical side surface 248 of the case 239, and the distance between the PLL circuit 218 and the digital signal processing means 237 is large. The reason is the same as in the case of FIG.

In either FIG. 13 or FIG.
The L circuit 218 and the digital signal processing means 237 are connected to a metal partition plate (232 and 244 or 233 and 234).
235 and 245, 246, 247). As described above, by separating the PLL circuit 218 and the digital signal processing means 237 with the metal partition plate, the degree of separation between the two circuits is improved and the digital signal processing means 2 is improved.
37 does not affect the PLL circuit 218.

In this embodiment, FIGS.
The implementation disclosed in FIG. 10 is also conceivable. Further, in both FIG. 13 and FIG. 14, when components are concentrated on one surface and a pattern or a printed resistance is formed on the other surface, the thickness can be further reduced.

(Embodiment 3) FIG. 1 shows a third embodiment of the present invention. In FIG. 1, the electric circuit of the card-type electronic tuner of the present invention has a signal input terminal 3 to which a high-frequency signal is input.
11, a mixer 313 to which the signal of the signal input terminal 311 is supplied to one input and the other input to which the output of the local oscillator 312 is connected, and extraction means to which the output of the mixer 313 is connected 314 and the extraction means 31
4 low-pass filter (not shown)
, An A / D converter 315 to which the output of the low-pass filter is connected, a demodulator 316 using a digital circuit to which the output of the A / D converter 315 is connected, and an output of the demodulator 316. Error correction circuit 317 and an output terminal 318 to which the output of the error correction circuit 317 is connected.
And a PLL circuit 319 having the output of the local oscillator 312 connected to one input and the output connected to the input of the local oscillator 312, and the PLL circuit 319.
, A data input terminal 320 to which a data signal is supplied, a power input terminal 321, the power input terminal 321 and the P
It has a DC-DC converter 322 provided between the LL circuit 319.

The operation of the card-type electronic tuner configured as described above will be described below.

The high-frequency signal input to the signal input terminal 311 is selected by the mixer 313 and the local oscillator 312 to have an intermediate frequency. As described in the first embodiment, the intermediate frequency is multiplied by, for example, a cosine wave, which is substantially equal to the digital modulation wave input by the extraction means 314, to extract information to be extracted as a constant term. Then, the double frequency appearing at this time is removed by a low-pass filter inserted next. However, a slight frequency shift or phase shift occurs between the modulated wave and the cosine wave generated in the extracting means 314. Information resulting from this slight deviation is demodulated by the next A / D converter 315 and demodulator 316 of a digital circuit. Therefore, the extracting means 314
Has a feature that a high intermediate frequency (that is, a wideband signal) can be input because an analog local oscillator is used as shown in the first embodiment. Example 1 in the extraction means 314
The local oscillator 312 may be fixed when feedback is not required as shown in FIG. On the other hand, if feedback is applied, the error rate decreases. A / D converter 3
15 and a demodulator 316 using a digital circuit need only compensate for the demodulation due to a slight frequency and phase shift generated by the extracting means 314. Therefore, the processing speed does not need to be high. realizable. The demodulated signal obtained in this manner is then transmitted to the error correction circuit 31.
Error correction is performed at 7. The error-corrected signal is output from the output terminal 318 to the personal computer, and digitally processed in the personal computer. Therefore, at this stage, the highest frequency (that is, wide band, for example, 20 MHz in satellite broadcasting) is allowed, and a large transmission capacity of 40 Mbps in QPSK can be obtained.

Next, the circuit arrangement will be described with reference to FIG. 2, an output terminal 318, a data input terminal 320, and a power input terminal 321 are provided on one side surface 326 of a case 323 (the case 323 has the same outer dimensions as the case 122). Then, when the case 323 is inserted into the memory card insertion slot, these terminals are fitted into a connector provided at the back of the slot, and signals are exchanged with a personal computer. In addition, a signal input terminal 311 is provided on the other side surface 327 facing the one side surface 326. A rod antenna 328 is attached to the signal input terminal 311. Also, the signal input terminal 31
1 may be connected to an external antenna via a cable.

As described above, since the signal input terminal 311 is located on the back of the case 323 of the card-type electronic tuner, a high-frequency signal can be directly connected to the signal input terminal 311. Therefore, there is no need to introduce a high-frequency signal into the personal computer. That is, a digital broadcast or the like can be received by the personal computer without changing the hardware of the personal computer. A printed circuit board 329 is mounted inside the case 323, and the printed circuit board 329 has circuits arranged as described below. Here, the internal antenna 330 may be provided near the signal input terminal 311 side. Further, a mixer 313 is arranged near the signal input terminal 311, and a local oscillator 312 is provided near the mixer 313.
In the vicinity of the power input terminal 321, a DC-DC converter 322 is mounted by being partitioned by a metal partition plate 331. Then, P near the data input terminal 320
The LL circuit 319 is mounted by being partitioned by a metal partition plate 332. Further, an error correction circuit 317 partitioned by a metal partition plate 333 near the output terminal 318 and a metal partition plate 334 adjacent to the partition of the error correction circuit 317.
And an A / D converter 315 partitioned by a metal partition plate 335 next to the demodulator 316.
And a metal partition plate 33 next to the A / D converter 315.
The extraction means 314 partitioned by 6 is mounted.

That is, the PLL circuit 319 is located near one of the vertical side surfaces 337 of the case 323,
, An A / D converter 315, a demodulator 316, and an error correction circuit 317.
Is located near the other vertical side surface 339 of the case 323, and the distance between the PLL circuit 319 and the digital signal processing means 338 is large.

As described above, in a card-type electronic tuner that receives digital broadcasting or the like, it is important that the influence of the PLL circuit 319 is not applied to the digital signal processing means 338. If the digital signal processing means 338 is arranged near the PLL circuit 319, the PLL
Normal digital processing cannot be performed due to the influence of the clock pulse of the circuit 319.

Another circuit arrangement will be described with reference to FIG. In FIG. 3, case 340 (case 34)
0 is the same outer dimension as the case 122. ), The output terminal 318 and the data input terminal 32
0 and a power input terminal 321 are provided. The signal input terminal 311 is also provided on the side surface 341 (not shown). Note that the signal input terminal 311 may be provided on one vertical side surface 342 near the horizontal side surface 341.

Therefore, this case corresponds to a case where a high-frequency signal has already been input to the personal computer.

A printed board 343 is mounted inside the case 340, and the printed board 343 has circuits arranged as follows. Here, an internal antenna 330 is provided near the signal input terminal 311 side. The internal antenna 330 is connected to the signal input terminal 31.
This is unnecessary when a high-frequency signal is input to 1.
Next, a DC-DC converter 322 is mounted near the power input terminal 321 by being partitioned by a metal partition plate 344. Then, P near the data input terminal 320
The LL circuit 319 is mounted by being partitioned by a metal partition plate 345. Further, an error correction circuit 317 partitioned by a metal partition plate 346 near the output terminal 318, and a metal partition plate 347 adjacent to the partition of the error correction circuit 317.
And an A / D converter 315 divided by a metal partition plate 348 next to the demodulator 316.
And a metal partition plate 34 next to the A / D converter 315.
The extraction means 314 partitioned by 9 is mounted.

That is, also in this case, the PLL circuit 3
19 is located near one vertical side surface 350 of the case 340, and the digital signal processing means 338 constituted by the extracting means 314, the A / D converter 315, the demodulator 316, and the error correction circuit 317 is the case 340. The other longitudinal side 35 of
1 and the distance between the PLL circuit 319 and the digital signal processing means 338 is large. The reason is the same as in FIG.

In either FIG. 2 or FIG. 3, the PLL circuit 319 and the digital signal processing means 338 are each provided with a metal partition plate (332 and 345 or 333, 334, 33.3).
35.336 and 346.347.348.349). As described above, by separating the PLL circuit 319 and the digital signal processing means 338 with the metal partition plate, the degree of separation between the two circuits is improved, and the digital signal processing means 338 is not affected by the PLL circuit 319. Absent.

In this embodiment, FIGS. 8, 9 and
The implementation disclosed in FIG. 10 is also conceivable. 2 and 3
In any case, when components are integrated on one surface and a pattern or a printed resistance is formed on the other surface, the thickness can be further reduced.

(Embodiment 4) FIG. 15 shows a fourth embodiment of the present invention. In FIG. 15, the electric circuit of the card-type electronic tuner of the present invention includes a signal input terminal 411 to which a high-frequency signal is input, a signal supplied from the signal input terminal 411 supplied to one input, and a signal input to the other input. The first mixer 413 to which the output of one local oscillator 412 is connected, the intermediate frequency amplifier 414 to which the output of the first mixer 413 is connected, and the output of the intermediate frequency amplifier 414 to one input The second mixer 41 is connected to the other input and connected to the output of the second local oscillator 415 at the other input.
6, an extraction unit 417 to which the output of the second mixer 416 is connected, a low-pass filter (not shown) to which the output of the extraction unit 417 is connected, and A to which the output of the low-pass filter is connected. / D converter 418 and this A /
A demodulator 419 using a digital circuit to which the output of the D converter 418 is connected, an error correction circuit 420 connected to the output of the demodulator 419, and an output terminal 421 to which the output of the error correction circuit 420 is connected. The output of the first local oscillator 412 is connected to one input and the output thereof is connected to a PLL circuit 422 connected to the input of the first local oscillator 412, and a data signal is supplied to the PLL circuit 422. Data input terminal 423, power input terminal 424, power input terminal 424 and the PLL circuit 4
And a DC-DC converter 425 provided between the DC-DC converter 22 and the DC-DC converter 22. These circuits are housed in the same case as the case 122 as in the above embodiment. Further, regarding the component arrangement, a metal partition plate is inserted between the first mixer 413 and the first local oscillator 412 and between the second mixer 416 and the second local oscillator 415, respectively, for isolation. It is important to make sure that you do not interfere with each other.

The operation of the card-type electronic tuner configured as described above will be described below.

The high-frequency signal of, for example, approximately 300 MHz input to the signal input terminal 411 is tuned by the first mixer 413 and the first local oscillator 412 to, for example, approximately 27 MHz.
z is the first intermediate frequency. This intermediate frequency is converted again in frequency by the second mixer 416 and the second local oscillator 415 to become a second intermediate frequency of, for example, approximately 450 KHz. To demodulate the second intermediate frequency, as described in the third embodiment, the digital modulation wave input by the extraction means 417 is multiplied by, for example, a cosine wave that is substantially equal to the modulation wave, and extracted as a constant term. Information to be extracted. Then, the double frequency appearing at this time is removed by a low-pass filter inserted next. However, a slight frequency shift or phase shift occurs between the modulated wave and the cosine wave generated in the extracting means 417. Information resulting from this slight deviation is demodulated by the next A / D converter 418 and demodulator 419 of a digital circuit. Then, the error correction circuit 420 corrects the error. The error-corrected signal is output from the output terminal 421 to the personal computer, where digital processing is performed in the personal computer.

As described above, in this embodiment, since two mixers are provided, image disturbance can be reduced. Therefore, high-density communication with a small frequency interval can be performed.

In this embodiment, FIGS.
The implementations disclosed in FIGS. 8, 9, and 10 are also contemplated.

(Embodiment 5) FIG. 16 shows a fifth embodiment of the present invention. In FIG. 16, the electric circuit of the card-type electronic tuner of the present invention includes a signal input / output terminal 511 for inputting / outputting a high-frequency signal, a duplexer 512 connected to the signal of the signal input / output terminal 511, and a duplexer 51.
2 is supplied to one input and the other input is connected to a first mixer 514 to which the output of the first local oscillator 513 is connected, and to the output signal of the first mixer 514. Extraction means 515, a low-pass filter (not shown) connected to the output of the extraction means 515, and an A / D converter 51 connected to the output of the low-pass filter.
6, a demodulator 517 using a digital circuit connected to the output of the A / D converter 516, an error correction circuit 518 connected to the output of the demodulator 517, and a connection to the output of the error correction circuit 518. Output terminal 519, the output of the first local oscillator 513 is connected to one input, and the output of the first PLL circuit 520 is connected to the input of the first local oscillator 513. A first data input terminal 521 to which a data signal is supplied to the first PLL circuit 520, a power input terminal 522, and a DC-DC converter 523 provided between the power input terminal 522 and the PLL circuit 520. , A transmission signal input terminal 524, a digital modulation processing means 525 connected to the input terminal 524, and an output of the digital modulation processing means 525. A second mixer 527 connected to the input of the second local oscillator 526 and connected to the other input, between the output of the second mixer 527 and the input of the duplexer 512. And an output of the second local oscillator 526 connected to one input and an output of which is connected to an input of the second local oscillator 526.
The circuit 529 includes a circuit 529 and a second data input terminal 530 to which a data signal is supplied to the second PLL circuit 529. The second PLL circuit 529 includes a DC-DC
The output of converter 523 is connected.

These circuits are housed in the same case as the case 122 as in the above embodiment. As a result, the card-type electronic tuner of the present invention can be directly inserted into the slot of the memory card without modifying the hardware of the personal computer.

As for the component arrangement, the isolation between the first local oscillator 513 and the second local oscillator 526 and between the digital modulation processing means 525 and the second PLL circuit 529 are improved, and the mutual interference is prevented. It is important to take care not to give That is, the first embodiment
5, FIG. 6, FIG. 8, FIG. 9, and FIG.

The operation of the card-type electronic tuner configured as described above will be described below.

First, the receiving system will be described. The high-frequency signal input to the signal input / output terminal 511 passes through the duplexer 512, and is mixed with the mixer 514 and the local oscillator 513.
And the frequency becomes the intermediate frequency. As described in the third embodiment, this intermediate frequency is digitally demodulated by the extracting means 515, the A / D converter 516, and the demodulator 517 of the digital circuit. The demodulated signal is then subjected to error correction by an error correction circuit 518. The error-corrected signal is output from the output terminal 519 to the personal computer, and digitally processed in the personal computer. Next, the transmission system will be described. The signal input to the input terminal 524 of the transmission signal is digitally modulated by the digital modulation processing means 525 as shown in, for example, (Equation 3). The digitally modulated signal is then passed through a second mixer 527 and a second local oscillator 526, for example, to approximately 30
The power is amplified by a high frequency amplifier 528 on a carrier of 0 MHz. Then, the output of the high-frequency amplifier 528 passes through the duplexer 512 and the signal input / output terminal 5
11 is output. The duplexer 512 is inserted to prevent the signal of the transmission system from flowing to the reception system.

As described above, the card-type electronic tuner of the present invention has a transmission system in addition to a reception system, so that both digital transmissions are possible.

Next, the circuit arrangement will be described in detail with reference to FIG. In FIG. 17, a case 531 (the case 531 has the same outer dimensions as the case 122)
The transmission system and the reception system are divided into two and mounted. Here, the receiving system has the same concept as that of the third embodiment, so that the transmitting system will be described.

On one lateral side 532 of case 531, a transmission signal input terminal 524 and a second data input terminal 530 are provided.
Is provided. These terminals are connected to the case 53
When 1 is inserted into the memory card insertion slot, it is fitted into a connector provided at the back of this slot, and signals are exchanged with a personal computer. Also,
The other side surface 533 facing this one side surface 532
Is provided with a signal input / output terminal 511. A rod antenna 534 is attached to the signal input / output terminal 511. Alternatively, a cable may be connected to an external antenna.

As described above, since the signal input / output terminal 511 is on the back of the case 531 of the card-type electronic tuner, high-frequency digital signals can be directly connected to the signal input / output terminal 511. Therefore, there is no need to introduce a high-frequency signal into the personal computer. That is, digital broadcasting and the like can be transmitted and received by the personal computer without changing the hardware of the personal computer. A printed board 535 is mounted inside the case 531. The printed board 535 has circuits arranged as described below.
Here, the internal antenna 5 is located near the signal input / output terminal 511 side.
36 may be provided. Further, the signal input / output terminal 511
The duplexer 512, the second mixer 527, and the second
Are provided toward one lateral side 532 in this order. The output of the duplexer 512 is wired to a receiving compartment 537.

The digital modulation processing means 525 is provided on one of the vertical side surfaces 540 by being surrounded by a metal partition plate 539, and is provided adjacent to the transmission signal input terminal 524 provided on the horizontal side surface 532. Have been. The transmission system and the reception system are separated by a metal partition plate 541. 2nd P
The LL circuit 529 includes a second data input terminal 530 partitioned by a metal partition plate 542 and provided on the lateral side surface 532.
Are provided adjacent to each other.

That is, the digital modulation processing means 525
It is mounted at a position distant from the second PLL circuit 529 and is insulated at high frequencies by partition plates 539 and 542 therebetween. Further, the second local oscillator 526 and the first local oscillator 513 mounted in the receiving system are also provided with a spatial distance and are insulated at a high frequency by the partition plate 541.

Another circuit arrangement will be described with reference to FIG. In FIG. 18, a case 545 (the case 545 has the same outer dimensions as the case 122) is provided.
One of the vertical side surfaces 54 is divided into two by a metal partition plate 546.
The transmission system is mounted on the side 7 and the reception system is mounted on the other vertical side 548. Here, the receiving system has the same concept as that of the third embodiment, so that the transmitting system will be described.

On one lateral side 549 of the case 545,
Transmission signal input terminal 524 and second data input terminal 53
0 is provided. And these terminals are in case 5
When 45 is inserted into the memory card insertion slot, it is fitted into a connector provided at the back of this slot, and signals are exchanged with a personal computer. Further, the one side surface 549 or this side surface 549
A signal input / output terminal 511 is provided on a nearby vertical side surface 548. Further, the signal input / output terminal 511 may be provided on the side surface 549.

A printed board 550 is mounted inside the case 545, and the printed board 550 has circuits arranged as follows. Signal input / output terminal 511
A duplexer 512 is provided in the vicinity. 513 is a first local oscillator provided in the receiving system. 527
Is a second mixer, and the other side surface 551 in the transmission system.
It is provided in the vicinity. A second local oscillator 526 is provided on one vertical side surface 547 side.

The digital modulation processing means 525 is provided on one of the vertical side surfaces 547 and is provided adjacent to the transmission signal input terminal 524 provided on the horizontal side surface 549 by being surrounded by a metal partition plate 552. I have. Second PLL circuit 5
29 is divided by a metal partition plate 553,
The second data input terminal 530 is provided adjacent to the second data input terminal 530 and is provided on the other vertical side surface 548 side.

That is, the digital modulation processing means 525
It is mounted at a position distant from the second PLL circuit 529 and is insulated at high frequencies by partition plates 552 and 553 therebetween. Further, a spatial distance is provided between the second local oscillator 526 and the first local oscillator 513 mounted in the receiving system, and a high-frequency insulation is provided by a partition plate 546.

An example of how the card-type electronic tuner having the transmission system and the reception system is used will be described below.

FIG. 19 shows an example used as an entertainment machine. In FIG. 19, 560 is a personal computer, and 561 is a bidirectional card type electronic tuner inserted into a memory card insertion slot of the personal computer 560. An external digital broadcast wave is received by an antenna 560a provided in the personal computer 560. This information is stored in the keyboard 560b and the display unit 560c of the personal computer 560.
Is processed by dividing the screen or inserting characters. This processing information is transmitted from the signal input / output terminal 511 of the card type electronic tuner to the VTR
(In addition, there is a mini-disc: MD, a digital video disc: DVD, etc.) The card-type electronic tuner 563 inserted in the memory slot receives and records. The signal output from the card-type electronic tuner 561 can be hard copied by a printer or the like, or transmitted to another personal computer or TV to monitor the state. In FIG. 19, the case where the transmission output is in the direction opposite to the slot side has been described. However, the transmission output may be transmitted from the antenna 560a in the personal computer 560 with the slot side.

FIG. 20 shows an example used for business. In FIG. 20, reference numeral 570 denotes a personal computer, which uses a two-way card-type electronic tuner 571 inserted into the personal computer 570 for processing business information generated on the go or the like, and connects a public telephone 572 or a mobile telephone 573 to the personal computer 570. This is an example of connecting to a host computer at the head office. The usage is to read the data in the host computer, present a quote on the spot,
When a negotiation is concluded, a production command based on the order is immediately issued to the host computer.

For reception, when a digital cellular phone is used, since a mixer and a local oscillator are already provided in the card-type tuner, it may be connected to the output of the duplexer as shown in the block diagram. When a telephone is used, the signal may be transmitted in baseband, so that the mixer and the local oscillator of the card-type tuner are not required. Taking these factors into consideration, the card type tuner is provided with a changeover switch for passing the mixer / local oscillator through, so that it is possible to handle both digital portable telephones and digital public telephones. Further, in some cases, the digital processing means of the receiving system in the card type tuner only needs to have either the extracting means or the A / D converter according to the frequency and the transmission amount.

On the other hand, for transmission, a mixer and a local oscillator after the digital modulation processing means of the card type tuner are not incorporated. That is, when using a digital mobile phone, the output of the digital modulation processing means of the card type tuner may be supplied to the input of the mixer of the transmission system of the digital mobile phone via the connection terminal. When a digital public telephone is used, in the case of baseband transmission, the output from the digital modulation processing means of the card type tuner may be directly supplied.

Note that the digital public telephone line is ISD
Where N is introduced, "0" if the protocol is combined
Since the "1" information can be input and output as it is, the card type tuner can cope with such a case if the card type tuner is provided with a protocol processing means and a switch for passing through both the transmission system and the reception system. In addition, a form having a convex portion such as 574 may be used in consideration of the additional circuit of the transmission system.

FIG. 21 shows an example used for factory production and the like. In FIG. 21, reference numeral 580 denotes a personal computer, which controls a machine tool 582 and a measuring machine 583 at distant places by using a two-way card type electronic tuner 581 from the personal computer 580. And these machine tools 582 and measuring machines 583
(Eg, yield, etc.) can also be obtained from a two-way card-type electronic tuner 584 inserted into these machines. In this case, both the transmitter and the receiver have a mixer and a local oscillator.

[0091]

As described above, according to the card-type electronic tuner of the present invention , the extraction means is provided between the mixer and the output terminal.
Or digital having at least one A / D converter
Since signal processing means is provided, digitally modulated
Receiving broadcasts etc. as they are to personal computers etc.
That data can be captured. Also, the signal input terminal
The other side of the terminal facing the output terminal or data input terminal
Surface, that is, on the back of the card-type electronic tuner
Therefore, high frequency signals can be directly connected to the signal input terminals.
it can. Therefore, a high
There is no need to re-introduce the frequency signal. That is, personal
Hardware such as adding an antenna to a computer
Receiving digitally modulated broadcasts etc. without modifying
I can trust. In addition, a mixer near the input terminal
So the circuit between the signal input terminal and the output terminal
Roads can be efficiently arranged at short distances .

Since the card-type electronic tuner has a card shape, the slot of the memory card can be used as it is, and there is no need to modify hardware such as a personal computer.

[Brief description of the drawings]

FIG. 1 is a block diagram of a card-type electronic tuner according to a third embodiment of the present invention.

FIG. 2 is a circuit layout diagram of FIG. 1;

FIG. 3 is a circuit layout diagram of another example.

FIG. 4 is a block diagram of a card-type electronic tuner according to a first embodiment of the present invention.

FIG. 5 is a circuit layout diagram of FIG. 4;

FIG. 6 is a circuit layout diagram of another example.

FIG. 7 is an external perspective view of FIG.

FIG. 8 is a sectional view of FIG. 7;

9 is an enlarged sectional view of a main part of FIG. 8;

FIG. 10 is a sectional view showing another example.

11A is a block diagram for explaining a one-axis extracting unit; FIG. 11B is a block diagram for explaining a two-axis extracting unit;

FIG. 12 is a block diagram of a card-type electronic tuner according to a second embodiment of the present invention.

FIG. 13 is a circuit layout diagram of FIG. 12;

FIG. 14 is a circuit layout diagram of another example.

FIG. 15 is a block diagram of a card-type electronic tuner according to a fourth embodiment of the present invention.

FIG. 16 is a block diagram of a card-type electronic tuner according to a fifth embodiment of the present invention.

FIG. 17 is a circuit layout diagram of FIG. 16;

FIG. 18 is a circuit layout diagram of another example.

FIG. 19 is an explanatory diagram showing the use of a card-type electronic tuner for entertainment.

FIG. 20 is an explanatory diagram showing the use of a card-type electronic tuner for business.

FIG. 21 is an explanatory diagram showing the use of a card-type electronic tuner for factory production and the like.

FIG. 22 is a block diagram of a conventional card-type electronic tuner.

[Explanation of symbols]

 311 Signal input terminal 312 Local oscillator 313 Mixer 314 Extraction means 315 A / D converter 318 Output terminal 319 PLL circuit 320 Data input terminal 323 Case 338 Digital signal processing means

Continuation of the front page (56) References JP-A-5-20272 (JP, A) JP-A-5-199130 (JP, A) JP-A-6-178218 (JP, A) JP-A-6-69984 (JP) JP-A-4-35305 (JP, A) JP-A-7-250001 (JP, A) JP-A-3-117950 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) H04B 1/08-1/26 H04N 5/44

Claims (6)

(57) [Claims] A signal input terminal to which a high-frequency signal is input; a mixer to which a signal of the signal input terminal is supplied to one input and an output of a local oscillator is supplied to the other input; An output terminal to which the output signal of the oscillator is supplied, and an output of the local oscillator connected to one input and an output connected to an input of the local oscillator.
An LL circuit and a data input terminal to which a data signal is supplied to the PLL circuit are mounted on a card-type case, and the output terminal and the data input terminal are provided on one lateral side of the case. On the other opposing lateral side,
A signal input terminal is provided, and near this signal input terminal.
A card-type electronic tuner in which the mixer is arranged beside and a digital signal processing means having at least one of an extracting means or an A / D converter is provided between the mixer and the output terminal. With placing the PLL circuit on one longitudinal side near the of 2. A printed circuit board mounted in the case, the
2. The card-type electronic tuner according to claim 1 , wherein a digital signal processing means is arranged near the other vertical side facing the vertical side. 3. The card-type electronic tuner according to claim 1 , wherein a partition plate is mounted between the PLL circuit provided on the printed circuit board mounted in the case and the digital signal processing means. 4. The card-type electronic tuner according to claim 1 , wherein a PLL circuit is provided on one surface of a double-sided printed circuit board or a multilayer printed circuit board mounted in the case, and digital signal processing means is provided on the other surface. 5. A first circuit in which a PLL circuit is provided in a case.
2. The card-type electronic tuner according to claim 1 , wherein the printed circuit board and a second printed circuit board provided with digital signal processing means are stored. 6. A signal input terminal to which a high-frequency signal is input, and a first input terminal to which a signal of the signal input terminal is supplied to one input and an output of the first local oscillator is supplied to the other input . a mixer, the output terminal for an output signal of the first mixer is supplied, the output of the first local oscillator whose output is connected to one input is the first <br/> local a first PLL circuit connected to an input of the oscillator, the output of the first de <br/> over data input terminal to which the data signal to the first PLL circuit is supplied to the first mixer A receiving system having extraction means or a digital signal processing means having at least one of an A / D converter between the input terminal and an input terminal of a transmission signal; and a digital modulation system connected to the input terminal of the transmission signal. Processing means and the output of the digital modulation processing means Other together No. is supplied to one input
One input is supplied with the output of the second local oscillator.
And the output signal of this second mixer is provided.
A high-frequency amplifier circuit, an output terminal of a transmission signal to which an output signal of the high-frequency amplifier circuit is supplied , and the second local oscillator
Is connected to one input and its output is
A second PLL connected to the input of the second local oscillator;
And a data signal is supplied to the second PLL circuit.
A transmitting system having a second data input terminal ;
Both are mounted on the same card type case, and the output terminal, the first data input terminal, the input terminal of the transmission signal, and the second data input terminal are provided on one lateral side of the case. The other side facing the side
A signal input terminal of the receiving system and an output terminal of the transmitting signal of the transmitting system
Connected to one signal input / output terminal.
A card-type electronic tuner in which the first mixer is arranged near a force terminal .