KR20120127997A - Spurless broadcasting receiver and control method thereof - Google Patents

Spurless broadcasting receiver and control method thereof Download PDF

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Publication number
KR20120127997A
KR20120127997A KR1020110045852A KR20110045852A KR20120127997A KR 20120127997 A KR20120127997 A KR 20120127997A KR 1020110045852 A KR1020110045852 A KR 1020110045852A KR 20110045852 A KR20110045852 A KR 20110045852A KR 20120127997 A KR20120127997 A KR 20120127997A
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KR
South Korea
Prior art keywords
frequency
clock
channel
memory
multiplication
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KR1020110045852A
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Korean (ko)
Inventor
여동협
Original Assignee
삼성전기주식회사
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Priority to KR1020110045852A priority Critical patent/KR20120127997A/en
Publication of KR20120127997A publication Critical patent/KR20120127997A/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
    • H04N5/50—Tuning indicators; Automatic tuning control

Abstract

The present invention relates to a spurless broadcast receiving module and a control method thereof, comprising: a tuner for selecting a channel of a digital broadcast signal received by channel selection control data; A demodulator for demodulating the digital broadcast signal of the selected digital broadcast channel; A decoder for decoding the demodulated digital broadcast signal; A memory storing a multiplication frequency of a clock component used in an internal device; And generating channel selection control data according to channel selection of a user using a key input unit and transmitting the channel selection control data to the tuner, and calculating a multiplication frequency when a channel having a frequency within a predetermined range with respect to the multiplication frequency stored in the memory is selected. Provided are a spurless broadcast receiving terminal including a control unit for changing a clock frequency of an internal device using a used clock frequency and a control method thereof.

Description

Spurless broadcasting receiver and control method

The present invention relates to a spurless broadcast receiving module and a control method thereof.

The broadcast receiving module generally has several spur channels under the influence of the clock generated from the surrounding IC, and the spur channel has a significantly lower sensitivity performance than other channels.

In particular, when the size of the module is small, such as a mobile broadcast receiving module, and in the case of a full module including the MMIC and several other ICs, the number of spur channels and the sensitivity performance deteriorate severely.

In general, the spur inside the broadcast receiving module may be transmitted through several lines (communication line, data line, power line, ground line) connected to the tuner IC or through the air when the distance between the ICs is close.

Therefore, a spurless broadcast receiving module having a function of preventing the occurrence of a spur channel is implemented in hardware using such a transmission characteristic.

That is, the spurless broadcast receiving module according to the prior art mainly used a method of directly removing noise of several lines connected to the tuner IC or spatially separating the CAN by covering the tuner IC.

However, this hardware approach can provide some improvements in sensitivity performance, but it does not completely eliminate spurs, and adds complexity and cost to the process with additional hardware installations.

The present invention is to solve the above problems, to investigate the clock component used in the MMIC or IC, to calculate the multiplication frequency and to change the clock when there is a channel having a corresponding frequency of the spur channel The present invention provides a spurless broadcast receiving terminal and a method of controlling the same, which can minimize occurrence.

The present invention for achieving the above object, the tuner for selecting a channel of the digital broadcast signal received by the channel selection control data; A demodulator for demodulating the digital broadcast signal of the selected digital broadcast channel; A decoder for decoding the demodulated digital broadcast signal; A memory storing a multiplication frequency of a clock component used in an internal device; And generating channel selection control data according to channel selection of a user using a key input unit and transmitting the channel selection control data to the tuner, and calculating a multiplication frequency when a channel having a frequency within a predetermined range with respect to the multiplication frequency stored in the memory is selected. And a control unit for changing a clock frequency of an internal device using the used clock frequency.

In addition, when a channel having a frequency in a predetermined range with respect to the multiplication frequency stored in the memory is selected by the controller of the present invention, the internal device for changing the clock frequency used to calculate the multiplication frequency may be a memory. .

In addition, the control unit of the present invention, by monitoring the channel selected according to the operation of the user's key input unit channel monitoring to output a clock change control signal when a channel having a frequency in a predetermined range with respect to the multiplication frequency stored in the memory is selected. group; And a clock change controller for changing a clock of an internal device using a clock frequency used to calculate a multiplication frequency when the clock change control signal is output from the channel monitor.

In addition, the control unit of the present invention, the tuner, a demodulator, a decoder and a clock and a clock component collector for examining the clock components therein; And a multiplication frequency calculator for calculating a multiplication frequency for the clock component irradiated by the clock component collector and storing the multiplication frequency in a memory.

On the other hand, the method of the present invention (A) the control unit monitors the selected channel according to the operation of the user's key input unit to determine whether a channel having a frequency in a predetermined range with respect to the multiplication frequency stored in the memory; And (B) the control unit changing a clock of an internal device using a clock frequency used to calculate a multiplication frequency when a channel having a frequency in a predetermined range with respect to the multiplication frequency stored in the memory is selected. .

In addition, the method of the present invention comprises the steps of (C) the control unit to examine the tuner, the demodulator, the decoder and the memory and the internal clock components before step (A); And (D) calculating, by the controller, a multiplication frequency for the irradiated clock component and storing the multiplication frequency in a memory.

Further, in the step (A) of the method of the present invention, the controller determines whether a predetermined range corresponding to the channel selected for the multiplication frequency stored in the memory falls within a range of 10 MHz.

In addition, in step (B) of the method of the present invention, when the controller selects a channel having a frequency within a predetermined range with respect to the multiplication frequency, the internal device for changing the clock frequency used to calculate the multiplication frequency is a memory. It is characterized by.

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 by investigating the clock component used in the MMIC or IC to calculate the multiplication frequency corresponding to that, if there is a channel using the corresponding frequency to change the clock to generate the spur channel prevent.

As such, by changing the clock to prevent the occurrence of a spur channel, it is possible to implement a simplified device because no hardware configuration such as noise cancellation or cans is required.

In addition, according to the present invention, by changing the clock to prevent the generation of the spur channel, it is possible to reduce the cost because no hardware configuration such as noise cancellation or cans is required.

1 is a block diagram of a spurless broadcast receiving terminal according to a first embodiment of the present invention.
FIG. 2 is a detailed block diagram of the controller of FIG. 1.
3 is a flowchart of a control method of a spurless broadcast receiving terminal according to the first embodiment of the present invention.

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. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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 spurless broadcast receiving terminal according to a first embodiment of the present invention.

Referring to FIG. 1, a spurless broadcast receiving terminal according to a first embodiment of the present invention includes an RF tuner 110, a demodulator 120, a decoder 130, a controller 140, a display unit 150, and a speaker 160. ), A key input unit 170 and a memory 180.

In this case, the decoder 130 may be built in the controller 140. In this case, the decoder performance of the broadcast receiving terminal may be implemented in software.

In this configuration, the RF tuner 110 selects a digital broadcast channel by channel control data of the controller 140, and down-converts the frequency of the broadcast signal of the selected channel to generate an intermediate frequency signal. do.

The demodulator 120 demodulates the modulated digital broadcast signal into an original signal.

The decoder 130 separates the broadcast signal demodulated by the demodulator 120 into an image and an audio signal, and decodes and outputs the separated image and audio signal, respectively.

The controller 140 performs a function of performing overall control of the broadcast receiving terminal. In particular, the controller 140 generates control data for determining channel selection control data of the broadcast receiving terminal, control of the demodulation and decoder, and decoding performance of the decoder by key input by the key input unit 170.

In addition, the controller 140 examines the RF tuner 110, the demodulator 120, the decoder 130, the memory 180, and internal clock components, and calculates a multiplication frequency of each clock component. When a channel having a frequency within a predetermined range (for example, 10 MHz) is selected from the calculated multiplying frequency, a different clock frequency is applied to a device using the clock frequency used to calculate the multiplying frequency. Ask the device to use the device by changing its clock frequency.

Of course, the controller 140 examines the clock component, calculates a multiplication frequency using the irradiated clock component, and does not directly perform a process of storing the calculated multiplication frequency in the memory 180. The multiplication frequency according to the clock component of each component may be calculated and stored in advance, and the controller 140 may use the stored multiplication frequency.

Next, the display unit 150 displays the video signal of the broadcast receiving terminal processed by the decoder 130 under the control of the controller 140.

In addition, the speaker 160 performs a function of reproducing the audio signal processed by the decoder 130 under the control of the controller 140.

The key input unit 170 includes keys for inputting numeric and character information and function keys for setting various functions. In addition, the function keys include keys for selecting a function such as channel selection for digital broadcast reception, broadcast reception mode control, and the like.

The memory 180 may include program memory and data memories. The program memory stores programs for broadcast reception of a broadcast receiving terminal. In addition, the data memory stores the multiplication frequency calculated by the controller 140 by examining the clock component of the internal device, or stores the multiplication frequency according to the clock component of each component calculated by the user. Such a data memory may also be used as an image memory for storing image data of a broadcast receiving terminal received under the control of the controller 140.

The operation of the spurless broadcast receiving terminal according to the present invention configured as described above is as follows.

Referring to FIG. 1, the digital broadcast reception signal of the broadcast receiving terminal is a signal and / or L-Band in a VHF (174 MHz-230 MHz: C5-C12) region and / or a UHF (470 MHz-862 MHz: C21-C69) region. (1 GHz-2.6 GHz).

At this time, when the user selects a broadcast channel, the controller 140 outputs control data corresponding to the channel selected by the RF tuner 110.

In addition, the RF tuner 110 generates and mixes an RF frequency according to the channel data, thereby generating an intermediate frequency signal of a selected channel. In this case, the intermediate frequency (IF) may be 36.17 MHz.

The analog intermediate frequency signal is applied to the demodulator 120. Then, the demodulator 120 demodulates the received analog signal by analog to digital conversion, and demodulates the demodulated data according to the set method.

That is, the demodulator 120 converts a signal of a selected channel output from the RF tuner 110 into digital data, and is controlled according to the number of carriers and additional symbols, and is a fast fourier transform (FFT) circuit. Will loop. In addition, the FFT signal is reconstructed in order and interval to be reproduced as a final signal through error correction, and output to the final output MPEG-2 TS.

The MPEG-2 TS signal output from the demodulator 120 is applied to the decoder 130. Then, the decoder 130 separates the received MPEG-2 TS signal into video, audio, and data, respectively, and decodes each of the received MPEG-2 TS signals and outputs the video and audio signals. In this case, the video signal may be a signal such as RGB or YUV, and the audio signal is generally output in the form of PCM stereo sound.

The video signal output from the decoder 130 is output to the display unit 150 to be displayed, and the audio signal is applied to and reproduced from the speaker 160.

At this time, the control unit 140 controls the overall operation of the broadcast receiving terminal as described above. To this end, the controller 140 outputs channel control data for determining a frequency region of the channel selected by the user to the RF tuner 110, and outputs control data such as a carrier mode.

In addition, the control unit 140 sets the demodulator 120 so that the demodulation operation can be normally performed by designating a code rate, a guard interval, or the like, which is information that varies according to broadcasting standards for each country. .

In addition, the controller 140 assigns a service to be actually watched in a physical channel determined by the decoder 130, and initializes a frame rate, a display size, and the like. At the same time, playback, stop, record, screen capture, and the like can be executed, and the feedback information according to the decoding process is also received.

In addition, the controller 140 examines the RF tuner 110, the demodulator 120, the decoder 130 and the memory 180, and the clock components therein. For example, the frequency of the clock used in the RF tuner 110, the demodulator 120, and the decoder 130 may be 500 MHz, and the frequency of the clock used in the memory 180 may be 125 MHz. .

As such, when the clock component of the internal component is irradiated, the controller 140 calculates a multiplication frequency of each clock. For example, when the frequency of the clock used in the memory 180 is 125Mhz, the doubled multiplication frequency is 250MHz, the tripled multiplication frequency is 375MHz, and the quadruple multiplication frequency is 500MHz.

Thereafter, the controller 140 stores the calculated multiplication frequency in the memory 180 and monitors whether a channel using a frequency in a predetermined range (for example, 10 MHz) is selected from the calculated multiplication frequency.

As a result of monitoring, when the channel having a frequency within a predetermined range (for example, 10 MHz) is selected from the calculated multiplication frequency, the control unit 140 uses a different clock to a device using a clock frequency used to calculate the multiplication frequency. Request the frequency to be used so that the device can change the clock frequency.

For example, when the broadcast receiving terminal is an ATSC-MH combo full module, the clock of the SDRAM memory 180 is 125 MHz, and the multiplication frequency of the clock is 625 MHz, and the frequency of 625 MHz corresponding to the multiplication frequency is 625 MHz. When the channel to be used is selected, the controller 140 monitors this and changes the clock frequency of the memory 180 from 125 MHz to 100 MHz, for example, to prevent spur generation.

In addition, when a channel using a frequency of 749 MHz, which is a frequency five times the clock frequency of the SDRAM memory 180 of the ATSC-MH combo full module, is similar to 750 MHz, the controller 140 monitors the memory 180 to monitor the same. Change the clock frequency from 125MHz to 100MHz to prevent spurs.

Of course, the controller 140 examines the clock component, calculates a multiplication frequency using the irradiated clock component, and does not directly perform a process of storing the calculated multiplier frequency in a memory. When the multiplication frequency according to the clock of each component is calculated and stored, the controller 140 may perform the above-described process using the stored multiplication frequency.

As described above, according to the present invention, the clock component used in the MMIC or the IC is investigated to calculate a multiplication frequency corresponding thereto, and the corresponding clock is changed when there is a corresponding channel to prevent the occurrence of a spur channel.

As described above, according to the present invention, since the clock is changed to prevent the occurrence of a spur channel, a hardware configuration such as noise cancellation or a can is not required, so that a simplified device can be implemented and a hardware configuration is not required. You can save money.

FIG. 2 is a detailed block diagram of the controller of FIG. 1.

Referring to FIG. 2, the controller of FIG. 1 includes a clock component collector 210, a multiplication frequency calculator 220, a channel monitor 230, and a clock change controller 240.

The clock component collector 210 examines the RF tuner 110, the demodulator 120, the decoder 130 and the memory 180, and the clock components therein. For example, the frequency of the clock used for the RF tuner 110, the demodulator 120, and the decoder 130 may be 500 MHz, and the frequency of the clock used for the memory 180 may be 125 MHz.

When the clock component of the internal component is irradiated, the multiplication frequency calculator 220 calculates a multiplication frequency of each clock. For example, when the frequency of the clock used for the memory 180 is 125 MHz, the doubled multiplier frequency is 250 MHz, the tripled multiplier frequency is 375 MHz, and the quadruple multiplied frequency is 500 MHz.

The multiplication frequency calculator 220 stores the calculated multiplication frequency in the memory 180.

Accordingly, the channel monitor 230 determines whether a channel having a frequency within a predetermined range (for example, 10 MHz) is selected from the multiplied frequency calculated by monitoring the selected channel according to the manipulation of the key input unit 170 of the user.

The channel monitor 230 informs the clock change controller 240 through a clock change control signal when a channel having a frequency within a predetermined range (for example, 10 MHz) is selected from the calculated multiplication frequency.

Then, the clock change controller 240 requests the device using the clock frequency used to calculate the multiplication frequency by referring to the device information stored in the memory 180 to use a different clock frequency so that the device changes the clock frequency. To use it.

Of course, the controller 140 examines the clock component, calculates a multiplication frequency using the irradiated clock component, and does not directly perform a process of storing the calculated multiplication frequency in a memory. Including only the clock change controller 240, a user may calculate and store a multiplication frequency according to a clock of each component in the memory 180, and allow the controller 140 to use the stored multiplication frequency.

3 is a flowchart of a control method of a spurless broadcast receiving terminal according to the first embodiment of the present invention.

Referring to FIG. 3, in the method for controlling a spurless broadcast receiving terminal according to the first embodiment of the present invention, first, the controller 140 includes an RF tuner 110, a demodulator 120, a decoder 130, and a memory. In addition, the internal clock component is examined (S110). For example, the frequency of the clock used in the RF tuner 110, the demodulator 120, and the decoder 130 may be 500 MHz, and the frequency of the clock used in the memory 180 may be 125 MHz.

When the clock component of the internal component is irradiated, the controller 140 calculates a multiplication frequency of each clock (S120). For example, when the frequency of the clock used in the memory 180 is 125Mhz, the doubled multiplication frequency is 250MHz, the tripled multiplication frequency is 375MHz, and the quadruple multiplication frequency is 500MHz.

The controller 140 stores the calculated multiplication frequency in the memory 180 (S130).

Subsequently, the controller 140 monitors the selected channel according to the manipulation of the key input unit 170 of the user (S140) and determines whether a channel having a frequency within a predetermined range (for example, 10 MHz) is selected from the calculated multiplication frequency. (S150).

As a result of the determination, when the channel having a frequency within a predetermined range (for example, 10 MHz) is selected from the calculated multiplication frequency, the controller 140 refers to the device information stored in the memory 180 to calculate the multiplication frequency. The device using the used clock frequency is requested to use a different clock frequency so that the corresponding device changes and uses the clock frequency (S160).

Of course, the controller 140 examines the clock component, calculates a multiplication frequency using the irradiated clock component, and does not directly perform a process of storing the calculated multiplication frequency in the memory 180. In operation 180, the multiplication frequency according to the clock of each component may be calculated and stored in advance, and the controller 140 may perform steps S140 to S160 using the stored multiplication frequency.

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.

110: RF tuner 120: demodulator
130: decoder 140: control unit
150: display unit 160: speaker
170: key input unit 180: memory
210: clock component collector 220: multiplication frequency calculator
230: channel monitor 240: clock change controller

Claims (8)

A tuner for selecting a channel of the digital broadcast signal received by the channel selection control data;
A demodulator for demodulating the digital broadcast signal of the selected digital broadcast channel;
A decoder for decoding the demodulated digital broadcast signal;
A memory storing a multiplication frequency of a clock component used in an internal device; And
Generate channel selection control data according to the channel selection of the user using a key input unit and transmit the channel selection control data to the tuner. And a control unit for changing a clock frequency of an internal device using a clock frequency.
The method according to claim 1,
A spurless broadcast receiving terminal, wherein the internal device is configured to change a clock frequency used to calculate a multiplication frequency when the controller selects a channel having a frequency within a predetermined range with respect to the multiplication frequency stored in the memory. .
The method according to claim 1,
The control unit,
A channel monitor for monitoring a selected channel according to a user's key input unit and outputting a clock change control signal when a channel having a frequency within a predetermined range with respect to a multiplication frequency stored in the memory is selected; And
And a clock change controller configured to change a clock of an internal device using a clock frequency used to calculate a multiplication frequency when the clock change control signal is output from the channel monitor.
The method according to claim 3,
The control unit,
A clock component collector for inspecting the tuner, the demodulator, the decoder and the memory, and an internal clock component; And
And a multiplication frequency calculator for calculating a multiplication frequency for the clock component irradiated by the clock component collector and storing the multiplication frequency in a memory.
(A) the control unit monitoring the selected channel according to the operation of the user's key input unit to determine whether a channel having a frequency in a predetermined range with respect to the multiplication frequency stored in the memory is selected; And
(B) the control unit includes changing a clock of an internal device using a clock frequency used to calculate a multiplication frequency when a channel having a frequency within a predetermined range is selected for a multiplication frequency stored in the memory. A control method of a lease broadcast receiving terminal.
The method according to claim 5,
Before step (A) above
(C) the control unit examining a tuner, a demodulator, a decoder, a memory, and internal clock components; And
(D) the control method of the spurless broadcast receiving terminal further comprises the step of calculating the multiplication frequency for the clock component irradiated and stored in the memory.
The method according to claim 5,
The control method of the spurless broadcast receiving terminal, characterized in that in step (A) the control unit determines whether a predetermined range corresponding to the selected channel for the multiplication frequency stored in the memory falls within the range of 10MHz.
The method according to claim 5,
In step (B), when the control unit selects a channel having a frequency in a predetermined range with respect to the multiplication frequency, the internal device for changing the clock frequency used to calculate the multiplication frequency is a spurless broadcast. Control method of the receiving terminal.
KR1020110045852A 2011-05-16 2011-05-16 Spurless broadcasting receiver and control method thereof KR20120127997A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023063448A1 (en) * 2021-10-14 2023-04-20 엘지전자 주식회사 Display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023063448A1 (en) * 2021-10-14 2023-04-20 엘지전자 주식회사 Display device

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