KR100570871B1 - Digital Multimedia Broadcasting Receiver using VHF high band of TV tuner - Google Patents

Abstract

The present invention is a digital multimedia broadcasting receiver that can receive digital multimedia broadcasting in addition to the TV tuner function by using a VHF high band of a TV tuner, and performs switching of signals input from an antenna according to a user's selection. A first switch; A UHF selecting unit for selecting, amplifying, and outputting a UHF signal; A VHF high frequency and DMB selecting unit for selecting and amplifying and outputting a VHF high frequency signal or a DMB signal; A VHF low frequency tuning unit for tuning, amplifying and outputting a VHF low frequency signal; A mixer for mixing the oscillation signal with the input signal to generate and output an intermediate frequency signal; A band pass filter for a TV performing band filtering; A TV demodulation configured to receive a TV signal and perform demodulation to output a demodulated signal; A bandpass filter for DMB that performs band filtering; A DMB decoder which receives a DMB signal and performs decoding to output a decoded signal; And a second switch that switches to the TV band pass filter when the TV intermediate frequency signal is input from the mixer, and switches to the DMB band pass filter when the DMB intermediate frequency signal is input from the mixer. A receiver is provided.

TV tuner, DMB, digital multimedia broadcasting, VHF, UHF

Description

Digital Multimedia Broadcasting Receiver using VHF high band of TV tuner}             

1 is a block diagram of a digital multimedia broadcasting receiver sharing a VHF high frequency band of a TV tuner according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an internal block of the UHF channel selecting unit of FIG. 1.

3 is an internal block diagram of the VHF high frequency and DMB selecting unit of FIG.

4 is an internal block diagram of the VHF low frequency tuning unit of FIG.

FIG. 5 is a block diagram illustrating an internal block of the DMB decoder of FIG. 1.

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

10 antenna 20 first switch

30: UHF station tuning unit 31: UHF input tuning unit

32: UHF amplifier 33: UHF output

40: VHF high frequency and DMB tuning unit 41: VHF high frequency and DMB input tuning unit

42: VHF amplifier 43: VHF output

50: VHF low frequency tuning unit 51: VHF low frequency input tuning unit

52: VHF low frequency amplifier 53: VHF low frequency output

60: mixer 61: oscillator

70 second switch 80 band pass filter for TV

90: TV demodulation 91: TV video output

92: TV audio output 100: DMB band pass filter

110: DMB decoder 111: channel decoder

112: VHF low frequency amplifier 113: VHF low frequency amplifier

121: stereo audio output unit 122: video output unit

The present invention relates to a digital multimedia broadcasting receiver, and more particularly, to a digital multimedia broadcasting receiver capable of receiving digital multimedia broadcasting in addition to a TV tuner function by using a VHF high band of a TV tuner.

Digital Audio Broadcasting (DAB) is the third generation of radio following AM and FM. It is a next generation radio broadcasting that provides CD quality sound, various data services and excellent mobile reception quality in the multimedia age. Features high quality audio, display, a variety of data services and two-way interactivity on listening radios from the European Union's jointly proposed EUREKA-147 out-of-band and the United States' in-band (IN) -BAND) can be largely classified.

Here, the EUREKA-147 method jointly proposed by Pan-Europe, one of digital audio broadcasting, uses a new frequency band other than the FM band in which analog broadcasting is serviced, and uses a new frequency band and features broadband transmission. It can operate in the frequency band of 3GHz, that is, VHF, UHF and L / S band, so that terrestrial broadcasting through the current FM band and TV band and satellite broadcasting through the L / S band can be received from mobile vehicles due to broadband transmission. It is known to be the best digital audio broadcasting system developed to date because of improved performance, high speed data transmission, and efficient use of frequency through a single frequency network configuration.

In addition, the in-band (IN-BAND) method proposed by the United States is a method of sharing the frequency band used by the existing analog broadcasting, In-Band On-Channel (IBOC) method for transmitting a digital audio signal to the AM or FM channel In-Band Adjacent-Channel (IBAC) method using adjacent channel of FM and FM channel is proposed.

Here, the IBOC method can improve the frequency efficiency in the dense area, but there is a problem of mutual interference with the existing analog signal, and the IBAC uses an empty guard band between FM broadcast channels to cope with the interference. Is relatively easy.

The IBOC scheme can operate at less than 25dB lower power than the FM signal, but can interfere with analog signals. According to the experiment, 45dB level difference is required for the digital signal to not affect the quality of the FM signal.

Therefore, in an FM receiver, interference of a digital signal must be reduced, and on the contrary, a digital audio broadcasting receiver needs a technique for extracting and removing an FM signal.

The IBOC scheme is based on the OFDM modulation scheme used in the Eureka 147 scheme to overcome the problem of multipath fading. IBAC uses a single carrier and adopts channel equalization technology.

"Portable digital audio broadcasting receiver" of Korean Patent Application No. 20-2002-0013351 discloses a portable digital audio broadcasting receiver which can be mounted on a vehicle holder.

The disclosed "portable digital audio broadcast receiver" includes a digital signal processing unit comprising an antenna, a main control unit, a down converter, a front end unit, a channel decoder, an audio / video decoder, a DA converter, a display unit, a storage unit, a power supply. It is configured to include a power charging unit formed with a charging terminal, and an audio output unit formed with a voice output terminal.

The antenna receives a digital audio broadcast signal transmitted from the outside, and the main controller outputs an antenna and a control signal for performing digital signal processing on the digital audio broadcast signal input from the antenna to control the overall operation.

The down converter, the front end unit, the channel decoder, the audio / video decoder, and the DA converter are digital signals for the digital audio broadcast signals based on the control signal of the main fisherman when a predetermined digital audio broadcast signal is input from the antenna. Perform the process.

The display unit displays the digital signal processed data information, the broadcast reception state and the operation process of the component, and the storage means stores the digital signal processed audio information and data information.

The power charger receives power from a charging terminal coupled to a predetermined connection means for supplying power from a power supply unit installed in a vehicle, and supplies a charging voltage to the portable digital audio broadcasting receiver, and a voice output unit supplies a power charger and the digital audio. The audio signal output from the broadcast receiver is transmitted to the vehicle audio through the voice output terminal.

Meanwhile, digital multimedia broadcasting (DMB) has recently emerged as a growth engine that is attracting most attention in the next generation broadcasting and communication convergence era.

DMB originally started out as the Digital Audio Broadcasting (DAB) described above with the goal of digital conversion of radio broadcasting, but has evolved into a comprehensive mobile multimedia service that includes audio as well as video.

DMB is a broadcast providing CD quality sound and data or video service through a mobile terminal in a mobile or fixed location. It is divided into terrestrial DMB and satellite DMB according to the transmission means.

DMB started with the intention to promote the digital conversion of domestic broadcasting media from the national level to increase the efficiency of the use of frequency resources and to the digital broadcasting of terrestrial, satellite and cable TV in earnest, and to radio broadcasting, which is the late digitalization area.

It also means expanding the opportunities for new business participation by broadcasters such as terrestrial broadcasters and broadcasting channel operators (PPs) and expanding the range of service choices for city and listeners.

As government policies and detailed technical standards for terrestrial digital multimedia broadcasting (DMB) are gradually completed, companies in this field are actively developing terrestrial DMB equipment and solutions.

This move is due to the fact that the overall specifications for terrestrial DMB, including audio and video compression methods, have been finalized, removing barriers to the development of terrestrial DMB equipment and solutions and reflecting market expectations.

Meanwhile, with regard to DAB receivers, the development of hybrid DAB (Digital Audio Broadcasting) receivers with functions such as MP3 and telematics is being actively developed.

According to the industry, the development of DAB receivers is rapidly expanding from simple radio broadcasting to technology applications in applications such as radio components, car stereos, mobile phones, and MP3 players. This is due to industry judgment that DABs are easy to integrate with various applications and that DAB functions alone cannot drive demand in the early market.

Also in the DMB receiver, the development of a function-complexed product like the DAB receiver has been requested. As a broadcast service is provided, the development of a product-complexed product with the TV receiver has been requested.

Accordingly, an object of the present invention is to provide a digital multimedia broadcasting receiver having a VHF high frequency band of a TV tuner in which a TV receiver and a DMB are functionally combined.

The present invention for achieving the above object is a first switch for switching the signal input from the antenna according to the user's selection; A UHF selecting unit that selects, amplifies, and outputs a UHF signal among the signals input from the antenna; A VHF high frequency and DMB selecting unit for selecting, amplifying, and outputting a VHF high frequency signal or a DMB signal among the signals input from the antenna; A VHF low frequency tuning unit for tuning, amplifying and outputting a VHF low frequency signal among the signals input from the antenna; A mixer configured to generate an intermediate frequency signal by mixing an oscillation signal to a signal input from the UHF selecting unit, the VHF high frequency and DMB selecting unit, and the VHF low frequency selecting unit; A band pass filter for the TV which receives the TV intermediate frequency signal and performs band filtering; A TV demodulation configured to receive a filtered TV signal from the TV bandpass filter and perform demodulation to output a demodulated signal; A bandpass filter for DMB that receives a DMB intermediate frequency signal and performs band filtering; A DMB decoder which receives the filtered DMB signal from the DMB bandpass filter and performs decoding to output a decoded signal; And a second switch to switch to the TV band pass filter when the TV intermediate frequency signal is input from the mixer, and to switch to the DMB band pass filter when the DMB intermediate frequency signal is input from the mixer. do.

Referring now to the drawings in detail with reference to the preferred embodiment of the present invention 1 as follows.

1 is a block diagram of a digital multimedia broadcasting receiver sharing a VHF high frequency band of a TV tuner according to an embodiment of the present invention.

Referring to the drawings, a digital multimedia broadcasting receiver sharing a VHF high frequency band of a TV tuner according to an embodiment of the present invention includes an antenna 10, a first switch 20, a UHF selecting unit 30, a VHF high frequency and a DMB. Tuning section 40, VHF low frequency tuning section 50, mixer 60, oscillator 61, second switch 70, TV band pass filter 80, TV demodulation 90, DMB band The pass filter 100 and the DMB decoder 110 are included.

The first switch 20 transmits a signal input from the antenna 10 to a selection circuit of any one of the UHF 30, the VHF high frequency and the DMB selecting unit 40, or the VHF low frequency selecting unit 50. Switch.

The UHF selecting unit 30 is a UHF amplifying unit 32 for amplifying a signal selected through the UHF input tuning unit 31 and the UHF input tuning unit 31 to tune the signal of the UHF band among the signals input from the antenna 10 A UHF output section 33 for outputting the amplified UHF signal.

Accordingly, the UHF selecting unit 30 extracts the UHF signal from the signal input from the antenna 10 by using the UHF input tuning unit 31, and then amplifies the UHF output unit 33 by the UHF amplifying unit 32. ) To the mixer 60.

The VHF high frequency and DMB selecting unit 40 synchronizes the high frequency signal and the DMB signal of the VHF band among the signals input from the antenna 10, and the VHF high frequency and DMB input tuning unit 41 and the VHF high frequency and DMB signal input tuning. And a VHF high frequency and DMB signal amplifier 42 for amplifying the selected VHF high frequency signal and the DMB signal, and a VHF high frequency signal and a DMB signal output unit 43 for outputting the amplified VHF signal and the DMB signal. Doing.

Accordingly, the VHF high frequency and DMB signal selecting unit 40 extracts the VHF high frequency signal or the DMB signal from the signal input from the antenna 10 through the VHF high frequency and the DMB input tuning unit 41, and amplifies the VHF high frequency and the DMB signal. Amplification is carried out using the section 42 and transmitted to the mixer 60 through the VHF high frequency and DMB signal output section 43.

The VHF low frequency tuning unit 50 selects the VHF low frequency input tuning unit 51 and the VHF low frequency signal input tuning unit 51 which tune the low frequency signal of the VHF band among the signals input from the antenna 10. A VHF low frequency signal amplifying section 52 for amplifying a signal and a VHF low frequency signal output section 53 for outputting an amplified VHF low frequency signal are provided.

Accordingly, the VHF low frequency signal selecting unit 50 extracts the VHF low frequency signal from the signal input from the antenna 10 through the VHF low frequency input tuning unit 51, and amplifies the VHF low frequency signal using the VHF low frequency signal amplifying unit 52. The VHF is transmitted to the mixer 60 through the low frequency signal output unit 53.

The mixer 60 mixes the oscillation signal and the input signal of the oscillator 61 to generate and output an intermediate frequency signal. That is, the mixer 61 outputs the signal obtained by subtracting the input signal from the oscillation frequency as an intermediate frequency signal, and outputs 45.75 MHz for the NTSC TV and 38.9 MHz for the PAL TV. . In the case of DMB, signals of other intermediate frequencies are generated and output.

Therefore, the mixer 60 generates and outputs an intermediate frequency signal suitable for each of the general TV signal and the DMB signal. In the case of the TV signal of the output signal of the VHF high frequency and the DMB selecting unit 40, the TV signal is an NTSC type TV. In the case of a PAL type TV, 45.75 MHz is converted to an intermediate frequency of 38.9 MHz and output to the second switch 70, and the DMB signal is converted to a DMB intermediate frequency and output to the second switch 70.

The second switch 70 transmits to the TV band pass filter 80 if it is an intermediate frequency signal of the TV signal, and to the DMB band pass filter 100 if it is an intermediate frequency signal of the DMB signal. do.

The TV band pass filter 80 outputs a TV signal of a required band among the input TV signals to the TV demodulation 90.

The TV demodulation 90 performs demodulation on the input TV signal to output the video signal to the TV video signal output unit 91, and output the audio signal to the TV audio signal output unit 92.

On the other hand, the DMB bandpass filter 100 passes the signal of the required band of the input DMB signal to the DMB decoder 110.

The DMB decoder 110 performs decoding on the input DMB signal, outputs the decoded stereo audio signal to the DMB audio output unit 111, and outputs the decoded video signal to the video output unit 112.

As shown in FIG. 5, the DMB decoder 110 includes a channel decoder 111, a video / audio / data decoder 112, and a D / A converter 113.

The channel decoder 111 bases on a predetermined broadcast signal input from the DMB bandpass filter 100, for example, data information including a video broadcast such as DMB broadcast, music, audio broadcast or weather information, traffic information, and the like. Demodulation is performed to the broadcast signal of the band.

Thereafter, the video / audio / data decoder 112 transmits the digital video broadcast data restored based on the predetermined decoding method to the D / A converter 113, and the digital audio broadcast data restored based on the predetermined decoding method. To the D / A converter 113.

The D / A converter 113 converts the digital video broadcast data reconstructed from the video / audio / data decoder 112 based on a predetermined decoding method into an analog signal and outputs the analog signal to the stereo video output unit 112.

In addition, the D / A converter 113 converts the digital audio broadcast data reconstructed from the video / audio / data decoder 112 based on a predetermined decoding method into an analog signal and outputs the analog signal to the stereo audio output unit 111.

On the other hand, the composite product by switching the VHF high frequency band and the mixer inside the TV tuner can be used for HHP, PDA, small LCD, DVD, DVD-R / W, PVR, home theater system and the like.

What has been described above is only one embodiment for implementing a DMB receiver using a high frequency band of a TV tuner according to the present invention, and the present invention is not limited to the above-described embodiment, and is claimed in the following claims. As described above, any person having ordinary knowledge in the field of the present invention without departing from the gist of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

According to the present invention as described above, by sharing the high-frequency band of the existing TV tuner has the effect of selecting the TV signal and DMB signal to enable viewing.

In addition, according to the present invention, there is no need to install the TV tuner and the DMB tuner mounted on the mobile receiver, respectively, there is an effect of generating a space and money saving effect.

Claims (5)

A first switch configured to switch a signal input from an antenna according to a user's selection; A UHF selecting unit that selects, amplifies, and outputs a UHF signal among the signals input from the antenna; A VHF high frequency and DMB selecting unit for selecting, amplifying, and outputting a VHF high frequency signal or a DMB signal among the signals input from the antenna; A VHF low frequency tuning unit for tuning, amplifying and outputting a VHF low frequency signal among the signals input from the antenna; A mixer configured to generate an intermediate frequency signal by mixing an oscillation signal to a signal input from the UHF selecting unit, the VHF high frequency and DMB selecting unit, and the VHF low frequency selecting unit; A band pass filter for the TV which receives the TV intermediate frequency signal and performs band filtering; A TV demodulation configured to receive a filtered TV signal from the TV bandpass filter and perform demodulation to output a demodulated signal; A bandpass filter for DMB that receives a DMB intermediate frequency signal and performs band filtering; A DMB decoder which receives the filtered DMB signal from the DMB bandpass filter and performs decoding to output a decoded signal; And And a second switch that switches to the TV band pass filter when the TV intermediate frequency signal is input from the mixer, and switches to the DMB band pass filter when the DMB intermediate frequency signal is input from the mixer. . The method of claim 1, The UHF channel selection unit, A UHF input tuning unit for tuning a signal in a UHF band among the signals input from the antenna; A UHF signal amplifier for amplifying the selected UHF signal through the UHF signal input tuning unit; And And a UHF signal output unit for outputting an amplified UHF signal. The method of claim 1, The VHF high frequency and DMB selection unit, A VHF high frequency and DMB input tuning unit for tuning a high frequency signal and a DMB signal in a VHF band among the signals input from the antenna; A VHF high frequency and DMB signal amplifier for amplifying the selected VHF high frequency signal and the DMB signal through the VHF high frequency and DMB signal input tuning unit; And A digital multimedia broadcasting receiver comprising a VHF high frequency signal and a DMB signal output unit for outputting an amplified VHF signal and a DMB signal.  The method of claim 1, The VHF low frequency tuning unit, A VHF low frequency input tuning unit for tuning a low frequency signal of a VHF band among the signals input from the antenna; A VHF low frequency signal amplifying unit for amplifying the selected VHF low frequency signal through the VHF low frequency input tuning unit; And A digital multimedia broadcasting receiver comprising a VHF low frequency signal output unit for outputting an amplified VHF low frequency signal. The method according to any one of claims 1 to 4, The DMB decoder, A channel decoder for demodulating data information including a predetermined broadcast signal input from the DMB bandpass filter into a baseband broadcast signal; A video / audio / data decoder for restoring digital video / audio broadcast data input from the channel decoder based on a predetermined decoding scheme; And And a D / A converter for converting and restoring digital video / audio broadcast data reconstructed according to a predetermined decoding method into an analog signal.

Images