KR20140049840A - Multi channel reciever - Google Patents

Multi channel reciever Download PDF

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Publication number
KR20140049840A
KR20140049840A KR1020120116162A KR20120116162A KR20140049840A KR 20140049840 A KR20140049840 A KR 20140049840A KR 1020120116162 A KR1020120116162 A KR 1020120116162A KR 20120116162 A KR20120116162 A KR 20120116162A KR 20140049840 A KR20140049840 A KR 20140049840A
Authority
KR
South Korea
Prior art keywords
low noise
unit
tuner
intermediate frequency
channel
Prior art date
Application number
KR1020120116162A
Other languages
Korean (ko)
Inventor
송문환
류태규
Original Assignee
삼성전기주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020120116162A priority Critical patent/KR20140049840A/en
Publication of KR20140049840A publication Critical patent/KR20140049840A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen

Abstract

The present invention relates to a multi-channel receiving apparatus, comprising: a low noise amplification and distribution unit for amplifying and outputting a stepped reduction of a broadcast signal when a step-off control signal is input in a turn-on state; A first tuner unit which tunes a predetermined channel from the broadcast signal output from the low noise amplification and distribution unit, converts a predetermined channel into an intermediate frequency signal, and generates and outputs an AGC voltage; A second tuner unit which selects another channel from the broadcast signal output from the low noise amplification and distribution unit, converts the other channel into an intermediate frequency signal, and generates and outputs an AGC voltage; A first demodulator for demodulating and outputting an intermediate frequency signal output from the first tuner unit; A second demodulator for demodulating and outputting an intermediate frequency signal output from the second tuner; And a microcomputer receiving AGC voltages from the first and second tuner units and outputting a stepped off control signal to the low noise amplifier and divider when any one AGC voltage is greater than or equal to a predetermined voltage. Is provided.

Description

Multi channel reciever

The present invention relates to a multi-channel receiving device.

The multi-channel receiver tunes both broadcast channels to one digital broadcast signal in a digital broadcast receiver such as a digital TV (D-TV) or set-top box (STB), or each broadcast channel in a different digital broadcast signal. It is one receiver capable of tuning.

Accordingly, the multi-channel receiving apparatus performs a PVR function of simultaneously recording two broadcast channels while simultaneously tuning two broadcast channels and watching one broadcast channel, or one broadcast in a digital broadcast receiver having a PIP function. A channel can be displayed as a main screen, and another broadcast channel can be displayed as a sub screen.

A conventional multi-channel receiver capable of such a function includes an amplifying unit for amplifying and distributing an input high frequency signal, selecting a channel from the high frequency signal distributed and inputted from the amplifying unit, and converting a broadcast signal of the selected channel into an intermediate frequency. A first tuner unit for converting and outputting a signal to the first tuner unit, and a first demodulator for demodulating the intermediate frequency converted from the first tuner unit; A second tuner unit for selecting a channel from the high frequency signals distributed by the amplifier and converting the broadcast signal of the selected channel into an intermediate frequency, and a second demodulator for demodulating the intermediate frequency output from the second tuner unit; There is a structure.

As described above, the multi-channel receiver uses a low noise amplifier to compensate for an input signal loss when one input signal is used as two or more tuners. In this case, the low noise amplifier is turned on / off. Compensate for the strong and weak field signals.

In this case, when the low noise amplifier is turned on / off to compensate for a signal processed by any one of the tuner units, a drastic change is made in the gain of the low noise amplifier.

This affects the input signal input to the other tuner unit, and the auto gain control signal of the tuner unit changes rapidly due to the input signal that is affected by this change, affecting the screen, causing the screen to be broken or momentarily. There is a case that does not come out.

Domestic Patent Publication No. 2009-0007007

The present invention has been made to solve the above problems, multi-channel reception to prevent a sudden change in the gain of the low noise amplification and distribution by applying a step-off control method in place of the low noise amplification and distribution on / off To provide a device.

According to an aspect of the present invention, there is provided a low noise amplification and distribution unit for amplifying and outputting a stepped reduction of a broadcast signal when a step-off control signal is input in a turn-on state; A first tuner unit which tunes a predetermined channel from the broadcast signal output from the low noise amplification and distribution unit, converts a predetermined channel into an intermediate frequency signal, and generates and outputs an AGC voltage; A second tuner unit which selects another channel from the broadcast signal output from the low noise amplification and distribution unit, converts the other channel into an intermediate frequency signal, and generates and outputs an AGC voltage; A first demodulator for demodulating and outputting an intermediate frequency signal output from the first tuner unit; A second demodulator for demodulating and outputting an intermediate frequency signal output from the second tuner; And a microcomputer that receives an AGC voltage from the first and second tuner units and outputs a step-off control signal to the low noise amplification and distribution unit when any one AGC voltage is greater than or equal to a predetermined voltage.

In addition, the microcomputer of the present invention reduces the gain of the low noise amplification and distribution step by step in the same width.

In addition, the microcomputer of the present invention reduces the microcomputer at the beginning and then decreases the gain of the low noise amplification and distribution unit more and more.

Further, the microcomputer of the present invention outputs an AGC voltage equal to or greater than the previous voltage from the tuner unit while the other tuner unit does not operate while turning on the low noise amplification and distribution unit based on the AGC voltage output from any one tuner unit. The low noise amplification and distribution are controlled to be off.

On the other hand, the present invention is a low-noise amplification and distribution unit for amplifying and outputting the step-by-step while reducing the incoming broadcast signal when the step-off control signal is input in the turn-on state; From the broadcast signal output from the low noise amplification and distribution unit, a predetermined channel is tuned and converted into an intermediate frequency signal, and an AGC voltage is generated and output. When the AGC voltage is higher than or equal to a predetermined voltage, the step-off control signal is output. A first tuner unit configured to output an amplification and distribution unit; The other channel is tuned from the broadcast signal output from the low noise amplifying and distributing unit to be converted into an intermediate frequency signal, the AGC voltage is generated and output, and when the AGC voltage is higher than or equal to a predetermined voltage, the step-off control signal is low noise. A second tuner unit for outputting to the amplification and distribution unit; A first demodulator for demodulating and outputting an intermediate frequency signal output from the first tuner unit; And a second demodulator for demodulating and outputting an intermediate frequency signal output from the second tuner.

In addition, the present invention provides a low-noise amplification and distribution unit for amplifying and outputting a step-by-step while reducing the incoming broadcast signal when the step-off control signal is input in a turn on state; A first tuner unit which tunes a predetermined channel from the broadcast signal output from the low noise amplification and distribution unit, converts a predetermined channel into an intermediate frequency signal, and generates and outputs an AGC voltage;

A second tuner unit which selects another channel from the broadcast signal output from the low noise amplification and distribution unit, converts the other channel into an intermediate frequency signal, and generates and outputs an AGC voltage; Demodulates and outputs an intermediate frequency signal output from the first tuner unit, receives an AGC voltage from the first tuner unit, and outputs a stepped off control signal to the low noise amplification and distribution unit when the AGC voltage is greater than or equal to a predetermined voltage. A first demodulator outputting the first demodulator; And

Demodulating and outputting an intermediate frequency signal output from the second tuner unit, and receiving an AGC voltage from the second tuner unit and outputting a stepped-off control signal to the low noise amplifier and divider when the AGC voltage is higher than or equal to a predetermined voltage. And a second demodulator.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

According to the present invention as described above, when using two or more tuners with one input signal, it is possible to compensate the input signal through the low noise amplification and distribution while minimizing the influence on the other tuner.

As a result, when the low noise amplification and distribution section is turned on / off to compensate for the signal processed by either tuner section according to the prior art, a drastic change is made in the gain of the low noise amplification and distribution section, and accordingly the other The input signal input to the tuner is affected, and the input signal that is affected by this change rapidly changes the automatic gain control signal of the tuner, affecting the screen, and thus the screen is not broken or does not come out momentarily. Make sure that you can solve the problems you are having.

1 is a detailed configuration diagram of a multi-channel receiving apparatus according to a first embodiment of the present invention.
FIG. 2 is a graph illustrating gain variation of a staged off control scheme of the multi-channel receiving apparatus of FIG. 1 according to an embodiment.
3 is a graph illustrating gain variation of a staged off control scheme of the multi-channel receiving apparatus of FIG. 1 according to another example.

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. It is also to be understood that the terms "first,"" second, "" one side,"" other, "and the like are used to distinguish one element from another, no. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a multi-channel receiving apparatus according to a first embodiment of the present invention.

Referring to FIG. 1, a multi-channel receiver according to a first embodiment of the present invention includes a low noise amplification and distribution unit 102, a first tuner unit 104, a second tuner unit 106, and a first demodulator unit ( 108, a second demodulation unit 110, and a microcomputer 120. Here, the low noise amplification and distribution unit 102, the first tuner unit 104, the second tuner unit 104, the first demodulator 108, and the second demodulator 110 are multi-channel receive tuners 100. ).

The low noise amplification and distribution unit 102 amplifies, outputs, and turns off a stepped off control signal while gradually reducing the incoming broadcast signal.

The low noise amplification and distribution unit 102 includes an amplifier designed to amplify the signal but to reduce the noise generated. In order to reduce the noise, the low noise amplification and distribution unit 102 uses low noise for the transistor.

The first tuner 104 tunes one channel among the signals amplified by the low noise amplification and distribution unit 102 to convert the channel into an intermediate frequency signal and output the converted signal.

In addition, the first tuner 104 generates and outputs an AGC (Automatic Gain Control) voltage of the channel selected from the signal input from the low noise amplification and distribution section 102.

The second tuner 106 selects another channel among the signals amplified by the low noise amplifying and distributing unit 102 and converts the other channel into an intermediate frequency signal.

In addition, the second tuner 106 generates and outputs an AGC (Automatic Gain Control) voltage of the channel selected from the signal output from the low noise amplification and distribution unit 102.

Next, the first demodulator 108 demodulates and outputs the intermediate frequency converted by the first tuner 104.

In addition, the second demodulator 110 demodulates and outputs an intermediate frequency output from the second tuner unit.

The microcomputer 200 feeds back the low noise amplification and distribution unit 102 to amplify the AGC voltage again when the AGC voltage output from the first tuner unit 104 is equal to or lower than a predetermined voltage (a constant sensitivity gain of the input signal).

On the contrary, the microcomputer 200 controls the low noise amplification and distribution unit 102 in a step-off control manner when the AGC voltage output from the first tuner unit 104 is equal to or greater than a predetermined voltage (a constant sensitivity gain of the input signal). To turn it off.

Next, the microcomputer 200 sends a low noise amplification and distribution unit 102 to amplify the AGC voltage again when the AGC voltage output from the second tuner unit 106 is equal to or lower than a predetermined voltage (a constant sensitivity gain of the input signal). Feedback.

In addition, the microcomputer 200 controls the low noise amplification and distribution unit 102 in a step-off control manner when the AGC voltage output from the second tuner unit 106 is equal to or greater than a predetermined voltage (a constant sensitivity gain of the input signal). Turn it off.

Hereinafter, the operation of the multi-channel receiving apparatus according to the first embodiment of the present invention of FIG. 1 will be described in detail.

First, the low noise amplification and distribution unit 102 amplifies and distributes a broadcast signal introduced in response to a control signal applied thereto.

At this time, when the step-off control signal is input in the turned-on state, the low noise amplification and distribution unit 102 is turned off after amplifying and outputting the voltage level of the broadcast signal output in steps.

The first tuner 104 tunes a predetermined channel from the broadcast signal output from the low noise amplifying and distributing unit 102 to convert the selected channel signal into an intermediate frequency signal.

In addition, the first tuner 104 generates and outputs an AGC (Automatic Gain Control) voltage of the channel selected from the signal input from the low noise amplification and distribution section 102.

On the other hand, the second tuner 106 selects another channel from the broadcast signal output from the low noise amplifying and distributing unit 102, and converts the signal of the tuned channel into an intermediate frequency signal.

In addition, the second tuner 106 generates and outputs an AGC (Automatic Gain Control) voltage of the channel selected from the signal output from the low noise amplification and distribution unit 102.

Next, the first demodulator 108 demodulates and outputs the intermediate frequency converted by the first tuner 104.

In addition, the second demodulator 110 demodulates and outputs an intermediate frequency output from the second tuner unit.

The microcomputer 200 provides a control signal for determining whether to operate the low noise amplification and distribution unit 102 based on the AGC voltage output from the first tuner 104 or the second tuner 106. In this case, when the microcomputer 200 turns off the low noise amplification and distribution unit 102, the microcomputer 200 provides the stepped off control signal to the low noise amplification and distribution unit 102 to control the low noise amplification and distribution unit 102.

That is, the microcomputer 200 operates the first tuner 104 while the low noise amplification and distribution unit 102 is turned on based on the AGC voltage output from the first tuner 104 or the second tuner 106. ) Or when the AGC voltage output from the second tuner 106 becomes equal to or greater than a predetermined voltage, the low noise amplification and distribution unit 102 is turned off using the step-off control signal.

At this time, the microcomputer 200 is turned off while gradually reducing the gain of the low noise amplification and distribution unit 102 as shown in FIG.

When performing such an operation, the microcomputer 200 may be reduced stepwise to the same size as shown in FIG. 2, and may be initially reduced as shown in FIG. have.

As described above, when the microcomputer 200 controls the gain by turning off the low noise amplification and distribution unit 102 in a stepwise manner, the AGC voltage of the tuner in which the AGC voltage is not higher than a certain level is gradually increased so that the screen is temporarily broken. You can prevent it from coming out.

Of course, the microcomputer 200 outputs an AGC voltage equal to or greater than the previous voltage from the tuner unit while the one of the tuner units turns on the low noise amplification and distribution unit 102 based on the AGC voltage. In this case, the low noise amplification and distribution unit 102 may be controlled to be turned off immediately without turning off in a step-off control manner.

In this case, such a control method may be more preferable because the microcomputer 200 does not need to consider the influence on the other tuner unit as the low noise amplification and distribution unit 102 is turned off.

On the other hand, while the microcomputer 200 is implemented to control the low noise amplification and distribution unit 102, the present invention is not limited thereto, and the first tuner unit 104 and the second tuner unit 106 are the low noise amplification and distribution unit 102. Can be implemented to control

That is, the first tuner 104 provides a control signal for determining whether to operate the low noise amplification and distribution unit 102 based on the generated AGC voltage. In this case, the first tuner 104 generates the generated AGC. When the voltage becomes higher than a predetermined voltage to turn off the low noise amplifying and distributing unit 102 in a turn-on state, a stepped off control signal is provided to the low noise amplifying and distributing unit 102 to control the low noise amplifying and distributing unit 102. do.

The second tuner 106 also provides a control signal for determining whether to operate the low noise amplification and distribution unit 102 based on the generated AGC voltage. In this case, the second tuner 106 generates the generated AGC. When the voltage becomes higher than a predetermined voltage to turn off the low noise amplifying and distributing unit 102 in a turn-on state, a stepped off control signal is provided to the low noise amplifying and distributing unit 102 to control the low noise amplifying and distributing unit 102. do.

Of course, although the microcomputer 200 or the first and second tuner units 104 and 106 are implemented to control the low noise amplification and distribution unit 102, the present invention is not limited thereto, and the second demodulator 108 and the second demodulator are not limited thereto. The grandfather 110 may be implemented to control the low noise amplification and distribution unit 102.

That is, the first demodulator 108 provides a control signal for determining whether to operate the low noise amplification and distribution unit 102 based on the AGC voltage generated by the first tuner 104. The unit 104 provides a stepped off control signal to the low noise amplifying and distributing unit 102 when the generated AGC voltage is higher than or equal to a predetermined voltage to turn off the low noise amplifying and distributing unit 102. And the distribution unit 102.

The second demodulator 110 also provides a control signal for determining whether to operate the low noise amplification and distribution unit 102 based on the AGC voltage generated by the second tuner 106. When the AGC voltage generated by the unit 106 becomes equal to or higher than a predetermined voltage to turn off the low noise amplification and distribution unit 102 in the turn-on state, a stepped off control signal is provided to the low noise amplification and distribution unit 102 to low noise amplification. And the distribution unit 102.

Although the above has been illustrated and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, it is common in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

102: low noise amplification and distribution unit 104: first tuner unit
106: second tuner section 108: first demodulation section
110: second demodulation unit 200: micom

Claims (6)

A low noise amplifying and distributing unit for amplifying and outputting a stepped-off control signal when the step-off control signal is input in a turned on state;
A first tuner unit which tunes a predetermined channel from the broadcast signal output from the low noise amplification and distribution unit, converts a predetermined channel into an intermediate frequency signal, and generates and outputs an AGC voltage;
A second tuner unit which selects another channel from the broadcast signal output from the low noise amplification and distribution unit, converts the other channel into an intermediate frequency signal, and generates and outputs an AGC voltage;
A first demodulator for demodulating and outputting an intermediate frequency signal output from the first tuner unit;
A second demodulator for demodulating and outputting an intermediate frequency signal output from the second tuner; And
And a microcomputer receiving the AGC voltages from the first and second tuners and outputting the step-off control signal to the low noise amplifier and divider when the AGC voltage input is equal to or greater than a predetermined voltage.
The method according to claim 1,
And the micom step by step with the same width to reduce the gain of the low noise amplification and distribution unit.
The method according to claim 1,
And the microcomputer initially reduces the gain and gradually increases the gain of the low noise amplification and distribution unit.
The method according to claim 1,
When the microcomputer turns on the low noise amplifier and divider based on the AGC voltage output from one of the tuner units, when the AGC voltage is higher than the previous voltage and the other tuner unit does not operate, the low noise amplifier and divider unit does not operate. Multi-channel receiving device that controls to be off.
A low noise amplifying and distributing unit for amplifying and outputting a stepped-off control signal when the step-off control signal is input in a turned on state;
From the broadcast signal output from the low noise amplification and distribution unit, a predetermined channel is tuned and converted into an intermediate frequency signal, and the AGC voltage is generated and outputted. A first tuner unit configured to output an amplification and distribution unit;
The other channel is tuned from the broadcast signal output from the low noise amplifying and distributing unit to be converted into an intermediate frequency signal, the AGC voltage is generated, and output. A second tuner unit for outputting to the amplification and distribution unit;
A first demodulator for demodulating and outputting an intermediate frequency signal output from the first tuner unit; And
And a second demodulator for demodulating and outputting an intermediate frequency signal output from the second tuner.
A low noise amplifying and distributing unit for amplifying and outputting a stepped-off control signal when the step-off control signal is input in a turned on state;
A first tuner unit which tunes a predetermined channel from the broadcast signal output from the low noise amplification and distribution unit, converts a predetermined channel into an intermediate frequency signal, and generates and outputs an AGC voltage;
A second tuner unit which selects another channel from the broadcast signal output from the low noise amplification and distribution unit, converts the other channel into an intermediate frequency signal, and generates and outputs an AGC voltage;
Demodulates and outputs an intermediate frequency signal output from the first tuner unit, receives an AGC voltage from the first tuner unit, and outputs a stepped off control signal to the low noise amplification and distribution unit when the AGC voltage is greater than or equal to a predetermined voltage. A first demodulator outputting the first demodulator; And
Demodulating and outputting an intermediate frequency signal output from the second tuner unit, and receiving an AGC voltage from the second tuner unit and outputting a stepped-off control signal to the low noise amplifier and divider when the AGC voltage is higher than or equal to a predetermined voltage. Multi-channel receiving device including a second demodulator.
KR1020120116162A 2012-10-18 2012-10-18 Multi channel reciever KR20140049840A (en)

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Application Number Priority Date Filing Date Title
KR1020120116162A KR20140049840A (en) 2012-10-18 2012-10-18 Multi channel reciever

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Application Number Priority Date Filing Date Title
KR1020120116162A KR20140049840A (en) 2012-10-18 2012-10-18 Multi channel reciever

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