KR101093067B1 - A digital multimedia receiver for processing the multi-carrier modulated signal and the signle-carrier modulated signal and a digital multimedia receiving method thereof - Google Patents

Abstract

Disclosed are a digital multimedia receiver and a reception method capable of receiving single and multiple carrier modulated signals. A digital multimedia receiver capable of receiving single and multiple carrier modulated signals according to the present invention includes a tuner for receiving a multiple carrier modulated digital multimedia signal and a single carrier modulated digital multimedia signal, and an analog to digital converter for converting an output signal from a tuner into a digital signal. According to the ID information read from the output signal of the analog-to-digital converter, the mode detector for detecting whether the output signal of the analog-to-digital converter is a digital multi-carrier modulated signal or a digital single carrier modulated signal, and according to the detection result from the mode detector, And a demodulator for demodulating either one of the digital majority carrier modulated signal and the digital carrier modulated signal from an analog to digital converter. According to the present invention, by detecting various ID information inserted into a signal in a transmitter, not only can it process a multicarrier modulated multimedia signal, but also can process a single carrier modulated multimedia signal.

Multiple Carrier Modulated Signal, Single Carrier Modulated Signal, ID Information, Analog-to-Digital Converter, Demodulator, Mode Detector

Description

A digital multimedia receiver for processing the multi-carrier modulated signal and the signle-carrier modulated signal and a digital multimedia receiving method

1 is a schematic block diagram showing a multi-carrier digital broadcast receiver according to the prior art;

2 is a schematic block diagram showing a single carrier digital broadcast receiver according to the prior art;

3 is a representative block diagram showing a digital multimedia transmitter for transmitting a digital multimedia signal containing ID information;

4 is a representative block diagram illustrating a digital multimedia receiver for processing both a multicarrier modulated signal and a single carrier modulated signal according to a first embodiment of the present invention;

5 is a representative block diagram illustrating a digital multimedia receiver for processing both a multicarrier modulated signal and a single carrier modulated signal according to a second embodiment of the present invention;

6A is a representative diagram showing a structure of a demodulator of a digital multimedia receiver according to a second embodiment of the present invention;

6B is a representative diagram showing parameters for a multicarrier modulated signal and a single carrier modulated signal stored in a register arrangement of a demodulator of a digital multimedia receiver according to a second embodiment of the present invention;

7 is a representative diagram illustrating a mode detection principle based on a structure of a PN (Pseudo Noise) sequence, a data frame of a multicarrier modulated signal, and a data frame of a single carrier modulated signal containing a PN sequence;

8 is a representative diagram showing a mode detection principle based on a pilot contained in a pilot and a modulated signal, and

9 is a flowchart of a digital media receiving method for processing both a multi-carrier modulated myth and a single carrier modulated signal.

The present invention relates to a digital multimedia receiver and a reception method, and more particularly, to a digital multimedia receiver capable of receiving single and multiple carrier modulated signals.

 In the age of multimedia communication and broadcasting, countries around the world are doing digital analogue broadcasting. Especially in developed countries such as the United States, Europe and Japan, digital broadcasting systems have already been developed and put into practical use. With the rapid development of technology, standards for digital broadcasting have been proposed separately in individual countries.

On December 24, 1996, the Federal Communications Commission of the United States. As the next generation TV broadcasting standard, the Digital Television Standard of the Advanced Television System Committee (ATSC) has been approved. All terrestrial broadcast operators must follow the ATSC standard in video / audio compression, packet data transmission structure and modulation and transmission system specifications (not specifically mentioned in the video format specifications, but leave it to the industrial world). Put it.

The ATSC digital TV standard is for the transmission of high-quality video, audio, and additional data over a 6 MHz bandwidth using a single carrier VSB scheme. It supports simultaneous terrestrial and high-speed cable broadcast modes. The main aspect of this approach is the 8-VSB modulation method. This is a variation of the current analog BSB scheme for modulation of digital signals. In Europe, a coded orthogonal frequency division multiplexing (COFDM) system has been adopted for European terrestrial digital video broadcasting (DVB-T) because of its advantages in high frequency efficiency and interference prevention.

Other digital multimedia broadcasting methods using various modulation methods have been proposed, and all the proposed plans can be divided into a multi-carrier method and a single broadcast method. Therefore, the traditional digital multimedia receiver can be divided into a multi-carrier system and a single broadcast system.

1 is a schematic block diagram illustrating a multi-carrier digital broadcast receiver according to the prior art. Traditional multi-carrier digital broadcast receivers include: a tuner 110 for receiving a multi-carrier modulated digital multimedia signal, and an analog to digital converter (analog digital converter) 120 for converting an output signal from the tuner 110 into a digital signal; A demodulator 130 for demodulating a multi-carrier modulated signal from the analog to digital converter 120; A Fast Fourier Transform (FFT) 140 for fast transforming the output signal from the demodulator 130; A synchronizing (SYNC) device 150 for synchronizing the demodulator 130 using the output signal from the fast Fourier transformer 140; An equalizer 160 for equalizing the output signal from the fast Fourier transformer 140; A Forward Error Correction (FEC) device 170 for performing forward error correction on the output signal from the equalizer 160; And a descrambler 180 that descrambles the output signal from the forward error corrector 170 to obtain the MPEG stream.

2 is a schematic block diagram illustrating a single carrier digital broadcast receiver according to the prior art. Traditional single carrier digital broadcast receivers include a tuner 210 for receiving a single carrier modulated digital multimedia signal; An analog to digital converter (analog digital converter) 220 for converting an output signal from the tuner 210 into a digital signal; A demodulator 230 for demodulating a single carrier modulated signal from the analog to digital converter 220; A synchronizer (SYNC) 240 for synchronizing the demodulator 230 using the output signal from the demodulator 230; An equalizer 250 that equalizes the output signal from the demodulator 230; Forward error corrector 260 for performing forward error correction on the output signal from equalizer 250; And a descrambler 270 that descrambles the output signal from forward error corrector 260 to obtain an MPEG stream.

As is well known, in the prior art, a receiver is not intended for processing both multi-carrier modulated signals and single carrier modulated signals. That is, traditional receivers cannot work in other digital broadcasting systems.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a digital multimedia receiver and a reception method capable of receiving single and multiple carrier modulated signals.

A digital multimedia receiver capable of receiving single and multiple carrier modulated signals according to the present invention for achieving the above object includes a tuner for receiving a multiple carrier modulated digital multimedia signal and a single carrier modulated digital multimedia signal, and outputting the output signal from the tuner. An analog-to-digital converter for converting to a signal, a mode detector for detecting whether the output signal of the analog-to-digital converter is a digital multicarrier modulated signal or a digital single carrier modulated signal according to ID information read from the output signal of the analog-to-digital converter, and And a demodulator for demodulating any one of the digital majority carrier modulated signal and the digital carrier modulated signal from an analog-to-digital converter in accordance with a detection result from the mode detector.

Preferably, the demodulator comprises a switch for exchanging an output signal from an analog-to-digital converter in accordance with a detection result from the mode detector, and a plurality of demodulating digital multi-carrier modulated signals from the analog-to-digital converter via the switch. A carrier demodulator and a single carrier demodulator via the switch and demodulating a digital single carrier modulated signal from the analog to digital converter.

In addition, the demodulator has a plurality of carrier and single carrier demodulation parameters in the demodulator set in advance, and according to a detection result from the mode detector, a digital majority carrier modulated signal and a digital single carrier modulated signal from the analog-to-digital converter. And demodulating any one of the switches, and the switch exchanges an output signal from the demodulator according to a detection result from the mode detector.

The ID information detected by the mode detector may be a PN (Pseudo Noise) order inserted in a header of a data frame of the digital media signal. The ID information detected by the mode detector is at least one pilot inserted into the modulated digital multimedia signal.

The ID information detected by the mode detector may include a PN (Pseudo Noise) order inserted into a header of a data frame of the digital media signal and at least one pilot inserted into the modulated digital multimedia signal. do.

On the other hand, the digital multimedia reception method capable of receiving single and multiple carrier modulated signals according to the present invention comprises the steps of: a) receiving a multiple carrier modulated digital multimedia signal and a single carrier modulated digital multimedia signal, b) the output in step a) Converting the signal into a digital signal; c) whether the output signal in step b) is a digital multicarrier modulated signal or a digital single carrier modulated signal according to ID information read from the output signal in step b). Detecting and outputting a detection result; and d) demodulating the digital multicarrier modulated signal or the digital single carrier modulated signal converted in step b) according to the detection result in step c).

Preferably, in step c), the ID information is a PN (Pseudo Noise) order inserted in a header of a data frame of the digital media signal. In addition, in step c), the ID information is at least one pilot inserted into the modulated digital multimedia signal.

Also, in step c), the ID information may include a PN (Pseudo Noise) order inserted in a header of a data frame of the digital media signal and at least one pilot inserted in the modulated digital multimedia signal. .

Hereinafter, with reference to the drawings will be described the present invention in more detail.

3 is a representative block diagram illustrating a digital multimedia transmitter for transmitting digital multimedia signals according to the present invention. The transmitter comprises a scrambler 310 to scramble the MPEG stream; A forward error corrector (FEC) 320 that performs forward error correction of the scrambled signal; A modulation / inverse discrete Fourier transform 330 for performing modulation or inverse discrete Fourier transform on the output signal from the forward error corrector 320; A PN order insertion device 340 for inserting a PN (Pseudo Noise) order into a data frame of an output signal from the modulation / inverse discrete Fourier transform device 330; A pilot insertion device 350 for inserting at least one pilot into an output signal from the PN order insertion device 340; And an RF device 360 for converting an output signal from the pilot insertion device 350 into an RF signal.

In traditional multi-carrier and single-carrier digital multimedia systems, the PN order and at least one pilot embedded in the signal at the transmitter are used for synchronization and channel estimation at the receiver. However, in the present invention, the PN order and pilots may be used as ID information for distinguishing a multicarrier modulated signal from a single carrier modulated signal at the receiver.

 It is up to the transmitter whether only one type of ID information is inserted into the signal, either in PN order or at least one ID information, such as at least one pilot, or both types of ID information are inserted in the signal.

If the modulation scheme or the structure of the data frame is changed, other ID information according to the transmission scheme may be inserted into the signal at the transmitter.

4 is a representative block diagram illustrating a digital multimedia receiver for processing both a multicarrier modulated signal and a single carrier modulated signal according to a first embodiment of the present invention. A digital multimedia receiver for processing both multi-carrier modulated signals and single-carrier modulated signals includes an analog-to-digital converter based on ID information read from signals from tuner 410, analog-to-digital converter (ADC) 420, and analog-to-digital converter 420. Mode detector 430 for detecting whether the output signal from 420 is a digital multicarrier modulated signal or a digital single carrier modulated signal, according to the detection result from the mode detector 430. One of the multicarrier modulated signal and the digital single carrier modulated signal output includes a demodulator 440 for demodulating, and a multicarrier and single carrier processing unit coupled to the demodulator 440.

 Except for mode detector 430 and demodulator 440, all devices operate in the same manner as in a traditional receiver. Therefore, the principle of operation of these devices will not be described in detail. Demodulator 430 includes a switch 441, a multiple carrier demodulator 442, and a single carrier demodulator 443.

As shown in FIG. 4, the mode detector 430 detects ID information, such as a specific PN sequence and at least one specific pilot inserted into the signal, from the output signal of the analog-to-digital converter. As a result, it may be determined whether the output signal from the analog-to-digital converter 420 is a multicarrier modulated signal or a single carrier modulated signal. As a result, the mode detector 430 outputs the detection result to the switch 441. According to the detection result from the mode detector 430, the switch 441 has a multi-carrier demodulator 442 or a single carrier demodulator 443 processes a multi-carrier modulated signal or a single carrier modulated signal from the analog-to-digital converter 420. So that the corresponding connection.

The multi-carrier demodulator 442 or single-carrier demodulator 443 then transmits the demodulated signal correspondingly to the multi-carrier or single carrier processing apparatus connected thereto.

Hereinafter, the process for detecting ID information in the mode detector 430 will be described with reference to FIGS. 7 and 8.

7 is a representative diagram illustrating a mode detection principle based on a PN order, a data frame of a multicarrier modulated signal, and a data frame of a single carrier modulated signal containing a PN order. As described with reference to FIG. 3, ID information such as a specific PN order and at least one pilot is inserted into a signal at the digital media transmitter. The digital multimedia receiver processes the received signal.

According to the PN order, when detecting a multicarrier mode or a single carrier mode, the mode detector 430 reads the PN order from the header of the data frame of the output signal from the analog-to-digital converter 420. The mode detector 430 then sets the PN order read from the header of the data frame of the output signal from the analog-to-digital converter 420 according to the multicarrier modulated signal and the single carrier modulated signal stored in the mode detector 430 in advance. Compare with order. As a result, the preset PN order stored in the mode detector 430 corresponding to the read PN order is determined.

Through comparison, the mode detector 430 determines the transmission mode of the digital multimedia signal. That is, the PN order is read from the signal, where the signal is a multicarrier modulated signal or a single carrier modulated signal. Next, the mode detector 430 outputs the detection result to the switch 441.

8 is a representative diagram showing a mode detection principle based on a pilot contained in a pilot and a modulated signal. In accordance with at least one pilot, when detecting a multiple carrier mode or a single carrier mode, the mode detector 430 detects at least one pilot from the output signal from the analog-to-digital converter 420. The mode detector then calculates the power difference between the peak value of the pilot and the average power value of the output signal from the analog-to-digital converter 420.

If the detected power difference value is within a preset range for the multicarrier signal in the mode detector 430, Pm (i.e., the peak value of the pilot's power for the multicarrier modulated signal and the average power of the multicarrier modulated signal). The pilot corresponding to the power difference) is determined as a pilot for the multicarrier modulated signal.

In other words, the modulated signal into which the pilot corresponding to Pm is inserted is a multicarrier modulated signal. In a similar way, if the detected pilot corresponds to Ps (i.e., the power difference between the peak value of the pilot's power for the single carrier modulated signal and the average power of the single carrier modulated signal), the pilot-inserted signal is a single carrier. Determined by the modulated signal. It will be apparent to those skilled in the art that these two types of identity information can be used individually or in concert.

5 is a representative block diagram illustrating a digital multimedia receiver for processing both a multicarrier modulated signal and a single carrier modulated signal according to a second embodiment of the present invention. All of the processing devices of the digital multimedia receiver shown in FIG. 5 are identical to those shown in FIG. 4 except for a demodulator 540 that includes a demodulator 541 and a switch 542. Thus, in this embodiment, the operation procedure for ID information detection, such as PN order and at least one pilot, is the same as that of the embodiment shown in FIG. However, the demodulation procedure according to the detection result from the mode detector 430 is different from that of the embodiment shown in FIG.

As shown in FIG. 5, a large number of multiple carriers and a single carrier demodulation parameter are stored in a register arrangement of demodulator 541. As a result, the demodulator 541 can demodulate a multiple carrier modulated signal and a single carrier modulated signal based on these parameters, respectively.

Subsequent operation will be described with reference to FIGS. 6A and 6B. 6A is a representative diagram illustrating a structure of a demodulator of a digital multimedia receiver according to a second embodiment of the present invention. FIG. 6B is a representative diagram illustrating parameters for a multicarrier modulated signal and a single carrier modulated signal stored in a register arrangement of a demodulator of a second embodiment of the present invention.

As shown in FIG. 6A, demodulator 541 includes a plurality of multipliers M1 through M4 that perform demodulation calculations and a register arrangement for storing multiple carrier and single carrier demodulation parameters. The multipliers M1 to M4 perform multiple carrier demodulation calculations or single carrier demodulation calculations using demodulation parameters for single carrier boards or demodulation parameters for multiple carrier modes, respectively, as shown in FIG. 6B. do.

According to the detection result from the mode detector 430, the multipliers M1 to M4 read the C11 to C14 demodulation parameters for the multicarrier mode, respectively, or perform a single carrier demodulation calculation to perform the multicarrier demodulation calculation. To do this we read the demodulation parameters C21 to C24 for each single carrier mode.

In this manner, a multiple carrier demodulated signal or a single carrier demodulated signal is obtained. If the mode detector 430 detects that the output signal from the analog-to-digital converter 420 is a multicarrier modulated signal, the switch 542 demodulates from the demodulator 541 according to the detection result of the connected multicarrier processing device. Connect to handle signal. Similarly, if mode detector 430 detects that the output signal from analog-to-digital converter 420 is a single carrier modulated signal, switch 542 indicates that the connected single carrier processing device is demodulated from demodulator 541. Connect to handle.

9 is a flowchart of a digital media receiving method for processing both a multicarrier modulated signal and a single carrier modulated signal. The receiver receives a multicarrier modulated digital multimedia signal and / or a single carrier digital multimedia signal (S910). The analog to digital converter converts the analog signal to a digital signal (S920). The mode detector 430 detects whether the signal is a multi-carrier modulated signal based on ID information inserted into the multi-carrier modulated signal transmitter (S930).

If the signal is a multi-carrier signal, the demodulator demodulates the signal in the multi-carrier demodulation mode (S940). Next, processing after multiple carrier demodulation is performed at the receiver (S950). If the signal is not a multi-carrier signal, the demodulator demodulates the signal in the single carrier demodulation mode (S960). Next, processing after the single carrier demodulation is performed in the receiver (S970). The process described in step S930 described above is similar to the corresponding content for the mode detector 430 described with reference to FIG. 4.

As already mentioned above, the ID information embedded in the digital multimedia signal includes a PN connection, at least one pilot, or both. It will be readily appreciated that any other ID information corresponding to the transmission mode may be used to identify a multicarrier modulated signal or a single carrier modulated signal.

As described above, according to the present invention, by detecting a variety of ID information inserted in the signal from the transmitter, not only can it process a multi-carrier modulated multimedia signal, but also can process a single carrier modulated multimedia signal.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, 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.

Claims (10)

A tuner for receiving a multicarrier modulated signal or a single carrier modulated signal; An analog to digital converter for converting an output signal from the tuner into a digital signal; A mode detector for detecting whether the output signal of the analog-to-digital converter is a digital multicarrier modulated signal or a digital single carrier modulated signal according to ID information read from the output signal of the analog-to-digital converter; And A demodulator for demodulating any one of the digital multicarrier modulated signal and the digital carrier modulated signal output from the analog-to-digital converter according to the detection result from the mode detector. Digital multimedia receiver capable of receiving. The method of claim 1, The demodulator may include a switch for switching an output signal from the analog-to-digital converter according to a detection result from the mode detector; A multiple carrier demodulator via the switch and demodulating the digital multiple carrier modulated signal from the analog to digital converter; And And a single carrier demodulator for demodulating the digital single carrier modulated signal from the analog-to-digital converter via the switch. The method of claim 1, The demodulation unit, A demodulator having preset multi-carrier and single-carrier demodulation parameters for demodulating any one of a digital multi-carrier modulated signal and a digital single carrier modulated signal from the analog-to-digital converter according to a detection result from the mode detector; And And a switch for switching the output signal from the demodulator in accordance with the detection result from the mode detector. The method according to any one of claims 1 to 3, And the ID information detected by the mode detector is a PN (Pseudo Noise) order inserted in a header of a data frame of the digital media signal. 4. The method according to any one of claims 1 to 3, And the ID information detected by the mode detector is at least one pilot embedded in the modulated digital multimedia signal. 4. The method according to any one of claims 1 to 3, The ID information detected by the mode detector includes a PN (Pseudo Noise) order inserted in a header of a data frame of the digital media signal and at least one pilot inserted in the modulated digital multimedia signal. Multimedia receiver capable of receiving multiple carrier modulated signals a) receiving a multi-carrier modulated signal or a single carrier modulated signal; b) converting the output signal in step a) into a digital signal; c) detecting whether the output signal in step b) is a digital multicarrier modulated signal or a digital single carrier modulated signal according to the ID information read from the output signal in step b), and outputting a detection result; And d) demodulating the digital multicarrier modulated signal or the digital single carrier modulated signal converted in step b) according to the detection result in step c). Digital multimedia receiving method. The method of claim 7, wherein In step c), the ID information is a digital multimedia reception method capable of receiving single and multiple carrier modulated signals, characterized in that the order of PN (Pseudo Noise) inserted in the header of the data frame of the digital media signal. The method of claim 7, wherein In step c), wherein the ID information is at least one pilot inserted into the modulated digital multimedia signal, the digital multimedia reception method capable of receiving single and multiple carrier modulated signals. The method of claim 7, wherein In step c), the ID information includes a PN (Pseudo Noise) order inserted into a header of a data frame of the digital media signal and at least one pilot inserted into the modulated digital multimedia signal. Digital multimedia receiving method capable of receiving a multi-carrier modulated signal.

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