KR20090050524A - Dual tuner module and broadcasting receiver having the same - Google Patents

Dual tuner module and broadcasting receiver having the same Download PDF

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Publication number
KR20090050524A
KR20090050524A KR1020070117011A KR20070117011A KR20090050524A KR 20090050524 A KR20090050524 A KR 20090050524A KR 1020070117011 A KR1020070117011 A KR 1020070117011A KR 20070117011 A KR20070117011 A KR 20070117011A KR 20090050524 A KR20090050524 A KR 20090050524A
Authority
KR
South Korea
Prior art keywords
ofdm demodulator
tuner unit
signal
transport stream
tuner
Prior art date
Application number
KR1020070117011A
Other languages
Korean (ko)
Inventor
최석동
Original Assignee
엘지이노텍 주식회사
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 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070117011A priority Critical patent/KR20090050524A/en
Priority to EP07851438A priority patent/EP2050271A4/en
Priority to PCT/KR2007/006467 priority patent/WO2008075852A1/en
Publication of KR20090050524A publication Critical patent/KR20090050524A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
    • H03J2200/07—Calibration of receivers, using quartz crystal oscillators as reference

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Circuits Of Receivers In General (AREA)
  • Radio Transmission System (AREA)

Abstract

A dual tuner module according to an embodiment includes a first tuner unit including an oscillator generating a reference frequency and selecting a channel from the received RF signal using the reference frequency and generating a first signal; A first OFDM demodulator for demodulating a first signal provided from the first tuner unit; A second tuner unit which selects a channel from the received RF signal by using a reference frequency provided from the first tuner unit and generates a second signal; A second OFDM demodulator for demodulating a second signal provided from the second tuner unit; It includes.

Description

Dual tuner module and broadcast receiver with same {DUAL TUNER MODULE AND BROADCASTING RECEIVER HAVING THE SAME}

An embodiment relates to a dual tuner module and a broadcast receiver having the same.

The dual tuner module may be applied to a digital broadcast receiver such as a digital television or a set top box (STB).

The digital broadcast receiver to which the dual tuner module is applied may perform a function of storing contents provided through another broadcast channel on a storage medium while simultaneously watching two broadcast channels by simultaneously tuning two broadcast channels. Also, in a digital broadcast receiver having a picture in picture (PIP) function, one broadcast channel may be displayed as a main screen, and the other broadcast channel may be displayed as a sub screen.

Embodiments provide a dual tuner module capable of reducing manufacturing costs and providing a high quality broadcast signal and a broadcast receiver having the same.

A dual tuner module according to an embodiment includes a first tuner unit including an oscillator generating a reference frequency and selecting a channel from the received RF signal using the reference frequency and generating a first signal; A first OFDM demodulator for demodulating a first signal provided from the first tuner unit; A second tuner unit which selects a channel from the received RF signal by using a reference frequency provided from the first tuner unit and generates a second signal; A second OFDM demodulator for demodulating a second signal provided from the second tuner unit; It includes.

The broadcast receiver includes an oscillator for generating a reference frequency, the first tuner unit for selecting a channel using the reference frequency from the received RF signal and generating a first signal; A first OFDM demodulator for demodulating a first signal provided from the first tuner unit; A second tuner unit which selects a channel from the received RF signal by using a reference frequency provided from the first tuner unit and generates a second signal; A second OFDM demodulator for demodulating a second signal provided from the second tuner unit; A display unit for displaying at least one of a first transport stream demodulated by the first OFDM demodulator and a second transport stream demodulated by the second OFDM demodulator; It includes.

The dual tuner module and the broadcast receiver according to the embodiment have the advantage of reducing the manufacturing cost and providing a high quality broadcast signal.

Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a dual tuner module according to an embodiment.

As shown in FIG. 1, the dual tuner module according to the embodiment includes a first antenna 110, a first tuner 120, a first OFDM demodulator 130, a second tuner 150, and a second tuner. An OFDM demodulator 160 is included.

The first tuner unit 120 includes an oscillator 121 for generating a reference frequency and a buffer 123 for buffering the reference frequency generated by the oscillator 121. The first tuner unit 120 may include a MOPLL (Mixer Oscillator Phase Locked Loop) circuit that selects a channel using a reference frequency generated by the oscillator 121. As the oscillator 121, a crystal oscillator may be applied. In addition, the first tuner 120 may include a loop through (L / T) for outputting an input RF signal.

The first tuner unit 120 receives the RF signal received from the first antenna 110. The first tuner unit 120 selects a channel using the reference frequency from the received RF signal and generates a first IF signal. The first OFDM demodulator 130 demodulates a first IF signal provided from the first tuner 120 to output a transport stream (TS).

The second tuner unit 150 selects a channel from the received RF signal by using a reference frequency provided from the first tuner unit 120 and generates a second IF signal. The second tuner 150 may receive an RF signal through the first tuner 120 and receive a reference frequency from the buffer 123 of the first tuner 120. The second tuner unit 150 may include a mixer oscillator phase locked loop (MOPLL) circuit that selects a channel using a reference frequency generated by the oscillator 121. The second OFDM demodulator 160 demodulates a second IF signal provided from the second tuner 150 to output a transport stream (TS).

According to an embodiment, the reference frequency generated by the oscillator 121 of the first tuner unit 120 is commonly used to select a channel in the first tuner unit 120 and the second tuner unit 150. As described above, according to the exemplary embodiment, the dual tuner module may be implemented using one oscillator 121 to reduce manufacturing costs and secure freedom of module design.

2 is a block diagram schematically illustrating a dual tuner module according to another embodiment.

As shown in FIG. 2, the dual tuner module according to the embodiment includes a first antenna 210, a first tuner unit 220, a first OFDM demodulator 230, a second antenna 240, and a second tuner. The unit 250 includes a second OFDM demodulator 260.

The first tuner 220 includes an oscillator 221 generating a reference frequency and a buffer 223 buffering the reference frequency generated by the oscillator 221. The first tuner unit 220 may include a mixer oscillator phase locked loop (MOPLL) circuit that selects a channel using a reference frequency generated by the oscillator 221. A crystal oscillator may be applied to the oscillator 221. In addition, the first tuner 220 may include a loop through (L / T) for outputting an input RF signal.

The first tuner unit 220 receives the RF signal received from the first antenna 210. The first tuner 220 selects a channel from the received RF signal using the reference frequency and generates a first IF signal. The first OFDM demodulator 230 demodulates a first IF signal provided from the first tuner 220 and outputs a transport stream (TS).

The second tuner 250 selects a channel from the RF signal received by the second antenna 240 using a reference frequency provided from the first tuner 220 and generates a second IF signal. The second tuner 250 may receive a reference frequency from the buffer 223 of the first tuner 220. The second tuner 250 may include a MOPLL (Mixer Oscillator Phase Locked Loop) circuit that selects a channel using a reference frequency generated by the oscillator 221. The second OFDM demodulator 260 demodulates a second IF signal provided from the second tuner 250 and outputs a transport stream (TS).

According to an embodiment, the reference frequency generated by the oscillator 221 of the first tuner 220 is commonly used to select a channel in the first tuner 220 and the second tuner 250. As described above, according to the embodiment, the dual tuner module is implemented using one oscillator 221, thereby reducing manufacturing costs and ensuring freedom of module design.

Meanwhile, when the dual tuner module having such a configuration is used, an antenna diversity function may be implemented as shown in FIGS. 3 and 4. The antenna diversity function means that RF signals are input from different antennas, each tuner unit and a demodulator select and demodulate the same channel, and compare the transport streams generated by each demodulator to obtain a good signal. It means to improve the sensitivity by selecting and outputting. 3 and 4 are block diagrams illustrating an antenna diversity function in the dual tuner module according to the embodiment.

In the dual tuner module according to the embodiment, as shown in FIG. 3, the first OFDM demodulator 230 receives a transport stream from the second OFDM demodulator 260. The first tuner unit 220 selects one channel from the RF signal received by the first antenna 210. The second tuner 250 selects the same channel as the channel selected by the first tuner 220 from the RF signal received by the second antenna 240.

The first OFDM demodulator 230 compares the transport stream generated by the first OFDM demodulator 230 with the transport stream generated by the second OFDM demodulator 260 and has a higher quality transport. Optionally output the stream. For example, the first OFDM demodulator 230 and the second OFDM demodulator 260 may transmit a signal through an inter integrated circuit (ICI). The first OFDM demodulator 230 and the second OFDM demodulator 260 may transmit a signal through a serial data line (SDA) and a serial clock line (SCL).

As described above, according to the embodiment, by implementing the antenna diversity function, the quality of the transport stream generated by the first OFDM demodulator 230 and the transport stream generated by the second OFDM demodulator 230 are compared. You can optionally output a better transport stream.

In addition, in the dual tuner module according to the embodiment, as shown in FIG. 4, the second OFDM demodulator 260 receives a transport stream from the first OFDM demodulator 230. The first tuner unit 220 selects one channel from the RF signal received by the first antenna 210. The second tuner 250 selects the same channel as the channel selected by the first tuner 220 from the RF signal received by the second antenna 240.

The second OFDM demodulator 260 compares the transport stream generated by the first OFDM demodulator 230 with the transport stream generated by the second OFDM demodulator 260 and has a higher quality transport. Optionally output the stream. For example, the first OFDM demodulator 230 and the second OFDM demodulator 260 may transmit a signal through an inter integrated circuit (ICI). The first OFDM demodulator 230 and the second OFDM demodulator 260 may transmit a signal through a serial data line (SDA) and a serial clock line (SCL).

As described above, according to the embodiment, by implementing the antenna diversity function, the quality of the transport stream generated by the first OFDM demodulator 230 and the transport stream generated by the second OFDM demodulator 230 are compared. You can optionally output a better transport stream.

Meanwhile, the dual tuner module according to the embodiment described above may be applied to a broadcast receiver. Broadcast receivers include digital televisions, set-top boxes, and the like.

The broadcast receiver according to the embodiment may include a display unit. The display unit may display at least one of a first transport stream demodulated by the first OFDM demodulator and a second transport stream demodulated by the second OFDM demodulator. The display unit may display a transport stream generated by one demodulator as a main screen and a transport stream generated by another demodulator as a sub screen.

In addition, the broadcast receiver according to the embodiment may include a storage medium. The storage medium may store one transport stream among a first transport stream demodulated by the first OFDM demodulator and a second transport stream demodulated by the second OFDM demodulator. According to an embodiment, the broadcast receiver may display a transport stream generated by one demodulator on the display unit and store the transport stream generated by another demodulator on the storage medium.

1 is a block diagram schematically illustrating a dual tuner module according to an embodiment.

2 is a block diagram schematically illustrating a dual tuner module according to another embodiment.

3 and 4 are block diagrams illustrating an antenna diversity function in a dual tuner module according to another embodiment.

<Explanation of symbols for the main parts of the drawings>

110, 210 ... first antenna 120, 220 ... first tuner

121, 221 ... oscillator 123, 223 ... buffer

130, 230 ... first OFDM demodulator 150, 250 ... second tuner

160, 260 ... second OFDM demodulator 240 ... second antenna

Claims (20)

A first tuner unit including an oscillator for generating a reference frequency, selecting a channel from the received RF signal using the reference frequency, and generating a first signal; A first OFDM demodulator for demodulating a first signal provided from the first tuner unit; A second tuner unit which selects a channel from the received RF signal by using a reference frequency provided from the first tuner unit and generates a second signal; A second OFDM demodulator for demodulating a second signal provided from the second tuner unit; Dual tuner module comprising a. The dual tuner module of claim 1 wherein the oscillator is a crystal oscillator. The dual tuner module of claim 1, wherein the first tuner unit receives an RF signal from a first antenna and the second tuner unit receives an RF signal from the first tuner unit. The dual tuner module of claim 1, wherein the first tuner unit includes a buffer that buffers a reference frequency generated by the oscillator, and the buffer provides the reference frequency to the second tuner unit. The dual tuner module of claim 1, wherein the first tuner unit comprises a mixer oscillator phase locked loop (MOPLL) circuit that selects a channel using the reference frequency. The dual tuner module of claim 1, wherein the first tuner unit receives an RF signal from a first antenna and the second tuner unit receives an RF signal from a second antenna. 7. The method of claim 6, wherein the first tuner unit and the second tuner unit selects the same channel, and the first OFDM demodulator is provided with a second transport stream demodulated by the second OFDM demodulator. And a dual tuner module for selectively outputting a higher quality transport stream by comparing the first transport stream generated by an OFDM demodulator and the second transport stream. The dual tuner module of claim 7, wherein the first OFDM demodulator and the second OFDM demodulator transmit signals through an inter integrated circuit (ICI). The method of claim 6, wherein the first tuner unit and the second tuner unit selects the same channel, the second OFDM demodulator is provided with a first transport stream demodulated by the first OFDM demodulator, the second channel A dual tuner module for selectively outputting a higher quality transport stream by comparing the second transport stream generated by an OFDM demodulator and the first transport stream. The dual tuner module of claim 9, wherein the first OFDM demodulator and the second OFDM demodulator transmit signals through an inter integrated circuit (ICI). A first tuner unit including an oscillator for generating a reference frequency, selecting a channel from the received RF signal using the reference frequency, and generating a first signal; A first OFDM demodulator for demodulating a first signal provided from the first tuner unit; A second tuner unit which selects a channel from the received RF signal by using a reference frequency provided from the first tuner unit and generates a second signal; A second OFDM demodulator for demodulating a second signal provided from the second tuner unit; A display unit for displaying at least one of a first transport stream demodulated by the first OFDM demodulator and a second transport stream demodulated by the second OFDM demodulator; Broadcast receiver comprising a. The broadcast medium of claim 11, further comprising: a storage medium storing one transport stream from among a first transport stream demodulated by the first OFDM demodulator and a second transport stream demodulated by the second OFDM demodulator. receiving set. The broadcast receiver of claim 11, wherein the first tuner unit receives an RF signal from a first antenna and the second tuner unit receives an RF signal from the first tuner unit. The apparatus of claim 11, wherein the first tuner unit includes a buffer for buffering a reference frequency generated by the oscillator, and a MOPLL circuit for selecting a channel using the reference frequency, wherein the buffer includes: And a broadcast receiver providing the reference frequency to the second tuner unit. The broadcast receiver as claimed in claim 11, wherein the display unit simultaneously displays a first transport stream demodulated by the first OFDM demodulator and a second transport stream demodulated by the second OFDM demodulator. 12. The broadcast receiver of claim 11, wherein the first tuner unit receives an RF signal from a first antenna and the second tuner unit receives an RF signal from a second antenna. 17. The apparatus of claim 16, wherein the first tuner unit and the second tuner unit select the same channel, and the first OFDM demodulator is provided with a second transport stream demodulated by the second OFDM demodulator. And a first transport stream generated by an OFDM demodulator and the second transport stream to selectively output a higher quality transport stream to the display unit. 18. The broadcast receiver of claim 17, wherein the first OFDM demodulator and the second OFDM demodulator transmit signals through an Inter Intergrated Circuit (IIC). 17. The apparatus of claim 16, wherein the first tuner unit and the second tuner unit select the same channel, and the second OFDM demodulator is provided with a first transport stream demodulated by the first OFDM demodulator. And a second transport stream generated by an OFDM demodulator and the first transport stream to selectively output a higher quality transport stream to the display unit. 20. The broadcast receiver of claim 19, wherein the first OFDM demodulator and the second OFDM demodulator transmit a signal through an inter integrated circuit (ICI).
KR1020070117011A 2006-12-18 2007-11-16 Dual tuner module and broadcasting receiver having the same KR20090050524A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020070117011A KR20090050524A (en) 2007-11-16 2007-11-16 Dual tuner module and broadcasting receiver having the same
EP07851438A EP2050271A4 (en) 2006-12-18 2007-12-12 Dual tuner module and broadcasting receiver having the same
PCT/KR2007/006467 WO2008075852A1 (en) 2006-12-18 2007-12-12 Dual tuner module and broadcasting receiver having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070117011A KR20090050524A (en) 2007-11-16 2007-11-16 Dual tuner module and broadcasting receiver having the same

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KR20090050524A true KR20090050524A (en) 2009-05-20

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KR1020070117011A KR20090050524A (en) 2006-12-18 2007-11-16 Dual tuner module and broadcasting receiver having the same

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