JP3072224B2 - 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.

[0002]

2. Description of the Related Art A conventional card-type electronic tuner will be described below.

A conventional card-type electronic tuner includes a signal input terminal, a mixer in which a signal from the signal input terminal is supplied to one input and an output of a local oscillator is supplied to the other input. A demodulator to which the output of the demodulator is supplied, an output terminal to which the output of the demodulator is supplied, and a PLL circuit connected to the data input terminal and controlling the oscillation frequency of the local oscillator are provided in a card type case. The signal input terminal, the output terminal, and the data input terminal are both provided on one lateral side of the case.

As a technique similar to this, there is, for example, JP-A-5-14133.

[0005]

However, in such a conventional configuration, when the card type electronic tuner is inserted into the set main body and connected, the signal input terminal, output terminal, and data input terminal of the electronic tuner are the same. It will be formed on the surface. Therefore, it is necessary for the set body to introduce a high-frequency signal to the signal input terminal separately, and there has been a problem that the signal system on the set body side must be largely changed.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a card-type electronic tuner in which a change in a set body is reduced .

[0007]

In order to achieve this object, a card-type electronic tuner according to the present invention comprises a set main body.
Is inserted so that part of it is exposed to the set body
Card type electronics stored in a card type case to be connected
A tuner, wherein the output terminal and the power input terminal
The data input terminal is provided on one lateral side of the case.
And the signal input terminal is connected to the other end of the case.
Provided on the lateral side so as to be exposed from the set body,
Prevent input signal level attenuation near signal input terminals.
A tuner including at least the mixer and the local oscillator.
And a metal part from this tuner part.
Providing the PLL circuit separated by a partition plate;
In this configuration, the section is separated from the PLL circuit in terms of high frequency .

[0008]

With this configuration, the card-type electronic tuner of the present invention is provided.
The output terminal, the power input terminal, and the data input terminal
And the signal input terminal
The other side of the case will be exposed from the set body
Since the configuration provided in earthenware pots, can be connected to the television signal <br/> directly to the signal input terminal of the card-type electronic tuner. Therefore, there is no need to separately introduce a television signal into the set body, and there is little change on the set side .
No.

[0009]

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

FIG. 1 is a plan view of a card-type electronic tuner according to an embodiment of the present invention, and FIG. 2 is a block diagram thereof.

A description will be given below with reference to FIGS. First, referring to FIG. 1, an electronic tuner according to the present invention includes a signal input terminal 1 and a mixer 3 in which a signal of the signal input terminal 1 is supplied to one input and an output of a local oscillator 2 is supplied to the other input. A demodulator 4 to which the output of the mixer 3 is supplied, an A / D converter 8 to which the output of the demodulator 4 is supplied, and an output terminal to which the output of the A / D converter 8 is supplied 5 and a PLL circuit 6 connected to the data input terminal 7 and controlling the oscillation frequency of the local oscillator 2 are housed in a card type case 13 shown in FIG. And the power input terminal 14 are provided on one side surface 15 of the case 13, and the signal input terminal 1 is provided on the other side surface 16 of the case 13. Thus, when the card 13 is inserted into the set body with one side surface 15 facing forward, the other side surface 16 can be exposed from the set body. Therefore, since the signal input terminal 1 is provided in the exposed portion, it is not necessary to modify the set main body side, and a high-frequency signal can be introduced to the signal input terminal 1. Further, if the vertical side surface 17 or 18 near the other horizontal side surface 16 of the case 13 is also set to be exposed from the set body side, the signal input terminal 1 is connected to the exposed vertical side surface 1.
7 and 18 may be provided.

A compartment of a tuner section 12 including a mixer 3 and a local oscillator 2 is provided in the vicinity of the input terminal 1. The tuner section 12, a data input terminal 7 on a lateral side surface 15, and
There is a compartment of the PLL circuit 6 between the one vertical side 17 and the other side. The DC-DC converter 9 is mounted near the power input terminal 14. Thus, consideration is given to separating the digital signal system and the high-frequency signal system as much as possible.

Further, a compartment for the demodulator 4 is provided between the tuner section 12, the output terminal 5 side of the lateral side surface 15 and the other vertical side surface 18 side, and the A / D conversion is performed near the output terminal 5. Vessel 8 is arranged.

An audio multiplexing circuit is provided between the demodulator 4 and the output terminal 5, and this audio multiplexing circuit is arranged near the output terminal 5. This is for enjoying a stereo broadcast.

The antenna system includes a signal input terminal 1 and
It is provided near the other lateral side surface 16. That is, the internal antenna 10 is mounted in the case 13, the internal antenna 10 is connected to the signal input terminal 1, and the antenna 10 is provided near the signal input terminal 1. If the antenna 10 is housed in the case 13 in this way, reception becomes possible without an external antenna. Here, the mixer 3 and the tuner unit 12 including the local oscillator 2 and the like are arranged near the signal input terminal 1, and are separated from the PLL circuit 6 and the demodulator 4 by a metal partition plate. I have. PLL circuit 6
Is provided adjacent to the data input terminal 7 so that a digital signal such as a clock does not affect the tuner unit 12.

Further, a demodulator 4 is provided near the output terminal 5 and an A / D is provided between the demodulator 4 and the output terminal 5.
A D converter 8 is connected, and the A / D converter 8 is arranged between the demodulator 4 and the output terminal 5.

As for the power supply, in order to use a single power supply,
The DC-DC converter 9 is used to connect the DC-DC converter 9 to the power input terminal 14 and
The output of the C-DC converter 9 is connected to a tuning voltage generation circuit of the PLL circuit 6 to obtain a tuning voltage to be supplied to the local oscillator 2. In addition to this, the voltage is converted from the power supply input terminal 14 to a required voltage, and the mixer 3, the local oscillator 2, the demodulator 4,
It is supplied to the A / D converter 8 and the like.

Next, an embodiment of the antenna 11 will be described. First, a bar antenna may be used, which may be arranged substantially parallel to the card side surface 16.

Next, a rod antenna may be used and provided outside the card 13 on the side surface 16 side.

Further, the antenna 11 may have a plate-like shape and a cross section in the short side direction may have a crescent shape. It is a so-called tape measure.

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

A desired channel is selected from a television video and audio signal input from the signal input terminal 1 by the antenna 10 or the antenna 11 by the tuner unit 12 including the mixer 3 and the local oscillator 2 and the like. .
Next, the video signal demodulated by the demodulator 4 can be YC-separated by the A / D converter 8 and output as RGB output directly to the set main body screen. The audio signal can be directly output from the main body speaker.

As described above, according to the present embodiment, the card-type electronic tuner of the present invention is inserted into a set body such as a personal computer or a video movie, and a television image and sound are transmitted to a special body of the set body. Reception can be performed without providing a signal input terminal as a terminal.

That is, in the card-type electronic tuner of this embodiment, the output terminal 5 and the data input terminal 7 are provided on one lateral side 15 of the case 13, and the signal input terminal 1 is provided on the other lateral side of the case 13. Since the television signal is provided on the vertical side surface 17 or 18 near the horizontal side surface 16, the television signal can be directly connected to the signal input terminal 1, and there is no need to provide a separate signal input terminal on the set body side.

The antenna 10 is connected to the signal input terminal 1, provided near the signal input terminal 1, and housed in the case 13. Therefore, in a strong electric field area, it is possible to receive television video and audio and AM radio broadcast without the trouble of separately using an external antenna. Further, since the antenna 10 is housed in the card 13, the antenna can be easily protected when not in use.

Since the tuner section 12 is arranged near the signal input terminal 1, the attenuation of the input level of the television signal supplied from the signal input terminal 1 can be suppressed as much as possible. Further, it is possible to suppress a signal other than a desired channel at the time of reception from interfering with other circuits such as the demodulator 4.

If the antenna 10 is constituted by a bar antenna integrated substantially in parallel with the lateral surface 16 of the card 13, it can receive AM radio broadcasting without using an external antenna and supplies a highly sensitive signal to the mixer 3. be able to.

If an external rod antenna is used outside the card 13 as the antenna 11, television video and audio can be received, and a highly sensitive television signal can be supplied to the mixer 3.

Further, if the antenna 11 is formed in a plate shape and has a crescent-shaped cross section in the short side direction, the antenna 11 has a high storage capacity, and the antenna can be easily protected when not in use. This can receive television video and audio signals equivalent to those of the rod antenna, and can supply a highly sensitive signal to the mixer 3.

Since the PLL circuit 6 is provided adjacent to the data input terminal 7, radiation of control signals such as a clock signal, a data signal, and an enable signal from the data input terminal 7 can be minimized. Further, it is possible to suppress interference from another oscillation circuit to the control signal line.

Further, since the demodulator 4 is provided near the output terminal 5, it is possible to minimize the interference of the demodulated video and audio signals, such as harmonics of other circuits such as the oscillation circuit 2, with the demodulator 4.

The demodulator 4 and the output terminal 5 in the case 13
Since the A / D converter 8 is provided between the first and second sets, the television image can be directly output to the display of the set main body without disposing the A / D converter 8 on the set main body side. Therefore, it is not necessary to provide the A / D converter 8 in the set main body, and the burden on the set main body can be reduced. Further, since the demodulated video signal is far from the oscillation circuit 2, interference such as harmonics can be suppressed as much as possible.
Further, since the A / D converter 8 and the output terminal 5 are provided adjacent to each other, it is possible to minimize disturbance of harmonics and the like from other circuits such as the oscillation circuit 2 to the signal after the A / D conversion. Can be.

Finally, the DC-DC converter 9 is connected to the power input terminal 14 and the output of the DC-DC converter 9 is connected to the PLL circuit 6.
The DC power supply (30 volts) generated by the C converter 9 can suppress the disturbance of noise from other circuits and can supply a stable power supply. Also, DC
-DC built-in DC converter 9
-It is not necessary to provide the DC converter 9, and the burden on the set body can be reduced.

[0034]

As described above, according to the card type electronic tuner of the present invention, the card type housed in the card type case which is inserted so that a part thereof is exposed from the set body and connected to the set body. An electronic tuner, wherein the card-type electronic tuner has a signal input terminal to which a television signal is directly supplied from an antenna provided outside the set main body, and a signal of the signal input terminal supplied to one input. A mixer to which the output of the local oscillator is supplied to the other input, a demodulator to which the output of the mixer is supplied, and an A / D converter to which the output of the demodulator is supplied
And the output of this A / D converter is connected
An output terminal provided close to the A / D converter, a power input terminal to which a DC voltage is input, and a power input
Output a DC voltage of about 30 volts
DC-D provided to use a single power supply for both
C converter and the output of this DC-DC converter
A PLL circuit provided in contact with and near the PLL circuit;
A data input terminal provided on the
The power input terminal and the data input terminal are provided on one lateral side of the case, and the signal input terminal is exposed from the set body on the other lateral side of the case .
It provided so that this Ju with arranging the tuner unit comprising said local oscillator and at least said mixer in order to prevent attenuation of the input signal level in the vicinity of the signal input terminal
And the tuner section is separated from the PLL circuit at a high frequency . The output terminal, the power input terminal, and the data input section are separated from each other by a tuner section and a metal partition plate. Terminals are provided on one side surface of the case, and the signal input terminals are provided on the other side surface of the case .
Since a structure which is provided so as to al exposed, tele
The vision signal can be directly connected to the signal input terminal of this electronic tuner. Therefore, there is no need to separately introduce a television signal into the set body, and changes on the set side
It has the effect of requiring less . Further, since the tuner section is disposed near the signal input terminal, the attenuation of the signal input level can be reduced, and the signal other than the desired channel does not interfere with other circuits. Furthermore, a metal connection is provided between the tuner and the PLL circuit.
Since it is separated at high frequency by the cutting plate, the data of the PLL circuit
Prevents digital signals from interfering with the tuner
Can be Furthermore, the tuning data line is short distance
And can be connected to the PLL circuit.
Data lines are not routed inside the card,
Noise from the ground signal can get on other circuits in the case
The malfunction can be improved because the performance is reduced. DC-
PLL loop close to the 30 volt output of the DC converter
Circuit, the tuning voltage in the PLL circuit is
It is unlikely that the noise enters.

[Brief description of the drawings]

FIG. 1 is a plan view of a card-type electronic tuner according to an embodiment of the present invention.

FIG. 2 is a block diagram of a card-type electronic tuner according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal input terminal 2 Local oscillator 3 Mixer 4 Demodulator 5 Output terminal 6 PLL circuit 7 Data input terminal 13 Case

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-22163 (JP, A) JP-A-5-14133 (JP, A) JP-A-5-136655 (JP, A) JP-A-5-136655 22163 (JP, A) Hikaru 4-47732 (JP, U)

Claims (1)

(57) [Claims] 1. A card-type electronic tuner housed in a card-type case inserted so as to be partially exposed from a set main body and connected to the set main body, wherein the card-type electronic tuner includes the card-type electronic tuner. A signal input terminal to which a television signal is directly supplied from an antenna provided outside the main body, and a signal of this signal input terminal is supplied to one input and an output of a local oscillator is supplied to the other input. A mixer, a demodulator supplied with the output of the mixer, and an analog / digital converter supplied with the output of the demodulator.
Tal converter (hereinafter referred to as A / D converter)
The output of this A / D converter is connected and
An output terminal provided in proximity to the A / D converter, straight
Power supply input terminal to which the
And output a DC voltage of approximately 30 volts
DC voltage booster provided to use a single power supply
Converter (hereinafter referred to as DC-DC converter)
PL provided close to the output of the DC-DC converter
L circuit and a data input provided near the PLL circuit.
And a power terminal, provided with the output terminal and the power input terminal and before <br/> Symbol data input terminals on one lateral side of said case, said signal input terminal and the other side of said case
Provided on the side so as to be exposed from the set body, in order to prevent attenuation of the input signal level near the signal input terminal.
A tube including at least the mixer and the local oscillator
Specifications from the tuner unit while disposing the burner portion of the metal
It said PLL circuit provided separately in the switching plate, the tuner
Is a card-type electronic tuner which is separated from the PLL circuit in terms of high frequency .