CN1791193A - Digital multimedia signal receiver and its receiving method - Google Patents
Digital multimedia signal receiver and its receiving method Download PDFInfo
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- CN1791193A CN1791193A CNA2004100988188A CN200410098818A CN1791193A CN 1791193 A CN1791193 A CN 1791193A CN A2004100988188 A CNA2004100988188 A CN A2004100988188A CN 200410098818 A CN200410098818 A CN 200410098818A CN 1791193 A CN1791193 A CN 1791193A
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Abstract
The digital multimedia signal receiver to treat single/multi-carrier mode comprises: a ADC to convert the signal from tuner into digital format; a controller to detect the modulation mode for digital signal; a single/multi-carrier signal treatment unit. Wherein, the controller detects at least one reference signal from single/multi-carrier treatment units to determine the modulation mode, and receive MPEG flow from single/multi-carrier unit to output for single/multi-carrier modulation mode.
Description
Technical field
The present invention relates to a kind of digital multimedia signal receiver and method of reseptance thereof.More particularly, the present invention relates to a kind of like this digital multimedia signal receiver that is used for processing single-carrier modulated signal and multicarrier modulated signal, it can be located in one of reason single-carrier modulated signal and multicarrier modulated signal automatically according to the modulating mode of the signal that receives.
Background technology
In the epoch of multimedia communication and broadcasting, the digitlization to the broadcasting of simulation class is carried out in countries in the world.Especially in the picture U.S., Europe and Japanese developed country, developed digit broadcasting system and entered practicality.According to development so fast, in each country, various criterion has been proposed in digital broadcasting.
On December 24th, 1996, FCC (FCC) has proposed Advanced Television Systems Committee (ATSC) digital television standard as television broadcasting standard of future generation.All terrestrial broadcasting operators must abide by the ATSC standard about the standard of video/audio compression, packet data transmission structure and modulation and transmission system.Only about the standard of video format not by concrete regulation, but leave the industry decision for.
ATSC numeral TV standard utilizes single carrier VSB mode to transmit high-quality video, audio frequency and additional data on the bandwidth of 6MHz, and supports terrestrial broadcasting pattern and high data rate cablecast pattern simultaneously.The main aspect of this mode is to be used for the 8-VSB modulator approach of improved form of the existing BSB mode of conduct of digital modulation.
In Europe, for its high frequency efficiency and antijamming capability and with COFDM (Coded Orthogonal Frequency Division Multiplexing (COFDM)) system applies in DVB-T (digital video broadcast-terrestrial).
Fig. 1 is the schematic block diagram that illustrates according to the multi-carrier digital multimedia signal receiver of prior art.
Traditional multi-carrier digital multimedia signal receiver comprises: tuner 110 is used to receive the digital multimedia signal of multi-carrier modulation; Analog to digital converter (ADC) 120, being used for the conversion of signals from tuner 110 outputs is digital signal; Demodulator 130 is used for the signal of demodulation from the multi-carrier modulation of ADC 120 outputs; Fast Fourier transform (FFT) unit 140 is used for carrying out fast fourier transform from the signal of demodulator 130 outputs; (SYNC) unit 150 is used for by using from the signal of demodulator 130 outputs or the signal of 140 outputs from the FFT unit to come demodulator 130 is carried out synchronously synchronously; Balanced unit 160 is used for the signal of 140 outputs from the FFT unit is carried out equilibrium; Forward error correction (FEC) unit 170 is used for carrying out forward error correction from the signal of balanced unit 160 outputs; And descrambler 180, be used for the signal of 170 outputs from the FEC unit is carried out descrambling code to obtain mpeg stream.
Fig. 2 is the schematic block diagram that illustrates according to the single carrier digital multimedia signal receiver of prior art.
Traditional single carrier digital multimedia signal receiver comprises: tuner 210 is used to receive the digital multimedia signal of single-carrier modulated; Analog to digital converter (ADC) 220, being used for the conversion of signals from tuner 210 outputs is digital signal; Demodulator 230 is used for the single-carrier modulated signals of demodulation from ADC 220 outputs; (SYNC) unit 240 is used for by using from the signal of demodulator 230 outputs to come demodulator 230 is carried out synchronously synchronously; Balanced unit 250 is used for the signal from demodulator 230 outputs is carried out equilibrium; Forward error correction (FEC) unit 260 is used for carrying out forward error correction from the signal of balanced unit 250 outputs; And descrambler 270, be used for the signal of 260 outputs from the FEC unit is carried out descrambling code to obtain mpeg stream.
As everyone knows, in prior art, do not have a kind of digital multimedia receiver handle the digital multimedia signal of multi-carrier modulation and single-carrier modulated digital multimedia signal the two, that is, traditional digital multimedia receiver can not be operated in the multiple digital multimedia broadcasting system.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of digital multimedia signal receiver and method of reseptance thereof, it can be located in one of reason single-carrier modulated signal and multicarrier modulated signal automatically according to the modulating mode of the signal that receives.
In order to realize above-mentioned purpose of the present invention, a kind of digital multimedia signal receiver that is used for processing single-carrier modulated signal and multicarrier modulated signal is provided, this receiver comprises: ADC is used for one of any analog signal conversion of the single-carrier modulated pattern that will receive and multi-carrier modulation pattern and becomes digital signal; The single-carrier signal processing unit is used for the processing single-carrier modulated signal; The multi-carrier signal processing unit is used to handle multicarrier modulated signal; And controller, be used for the modulating mode of the signal that determine to receive,
Wherein, controller detects one of at least at least one reference signal from single-carrier signal processing unit and multi-carrier signal processing unit, determine the modulating mode of the signal of reception according to reference signal, and when the modulating mode of digital signal is expressed as the single-carrier modulated pattern, receive mpeg stream with output from the single-carrier signal processing unit, and when the modulating mode of digital signal is expressed as the multi-carrier modulation pattern, receive mpeg stream with output from the multi-carrier signal processing unit.
According to an aspect of the present invention, the single-carrier signal processing unit comprises: the SC demodulating unit is used for the digital signal of demodulation from ADC output; The SC lock unit is used to receive the signal from the demodulation of SC demodulating unit, produces synchronizing signal, and sends synchronizing signal to the SC demodulating unit; The SC equalizer is used for the signal of equilibrium from the demodulation of SC demodulating unit; The SC-FEC unit is used for the signal of forward error correction from the equilibrium of SC equalizer; With the SC descrambler, be used for the signal of descrambling code, and produce mpeg stream from the forward error correction of SC-FEC unit; And the multi-carrier signal processing unit comprises:
The MC demodulating unit is used for the digital signal of demodulation from ADC output; The MC lock unit is used to receive the signal from the demodulation of MC demodulating unit, produces synchronizing signal, and sends synchronizing signal to the MC demodulating unit; The MC equalizer is used for the signal of equilibrium from the demodulation of MC demodulating unit; The MC-FEC unit is used for the signal of forward error correction from the equilibrium of MC equalizer; With the MC descrambler, be used for the signal of descrambling code, and produce mpeg stream from the forward error correction of MC-FEC unit.
Controller one of at least detects the rub-out signal of at least one mpeg stream as the reference signal from SC descrambler and MC descrambler.
In order to realize above-mentioned purpose of the present invention, a kind of method of reseptance that is used for the digital multimedia signal receiver of processing single-carrier modulated signal and multicarrier modulated signal is provided, and the method comprising the steps of: (a) analog signal conversion that receives is become digital signal; (b) at the signal of single-carrier signal processing unit and multi-carrier signal processing unit for processing A/D conversion, and from each processing unit output mpeg stream; (c) one of at least detect at least one reference signal from single-carrier signal processing unit and multi-carrier signal processing unit, and determine the modulating mode of the signal of reception according to reference signal; (d), then receive mpeg stream with output from the single-carrier signal processing unit if the modulating mode of digital signal is expressed as the single-carrier modulated pattern; If (e) modulating mode of digital signal is expressed as the multi-carrier modulation pattern, then receive mpeg stream with output from the multi-carrier signal processing unit.
At step (c), reference signal is the rub-out signal from the mpeg stream of step (b) output.
Description of drawings
In conjunction with the drawings embodiment is described, above aspect of the present invention and other advantages will become apparent, wherein:
Fig. 1 is the schematic block diagram that illustrates according to the multi-carrier digital multimedia signal receiver of prior art;
Fig. 2 is the schematic block diagram that illustrates according to the single carrier digital multimedia signal receiver of prior art;
Fig. 3 is the block diagram that illustrates according to the digital multimedia signal receiver of the embodiment of the invention; With
Fig. 4 is the flow chart that illustrates according to the method for reseptance of the digital multimedia signal receiver of the embodiment of the invention.
Embodiment
To describe embodiments of the invention in detail now, its example shows that in the accompanying drawings wherein, identical label is represented identical parts all the time.Below, by describing embodiment with reference to the accompanying drawings to explain the present invention.
Fig. 3 is the block diagram that illustrates according to the digital multimedia signal receiver of the embodiment of the invention.
As shown in Figure 3, this digital multimedia signal receiver comprises: antenna 305, tuner 306, ADC 310, controller 320, single-carrier signal processing unit 330 and multi-carrier signal processing unit 340.
This single-carrier signal processing unit 330 comprises: SC (single carrier) demodulating unit 3301, SC equalizer 3302, SC-FEC unit 3303, SC descrambler 3304 and SC lock unit 3305.This multi-carrier signal processing unit 340 comprises: MC (multicarrier) demodulating unit 3401, MC equalizer 3402, MC-FEC unit 3403, MC descrambler 3404 and MC lock unit 3405.
When digital multimedia signal receiver of the present invention was started working, tuner 306 received analog signal.ADC 310 will become digital signal from the analog signal conversion that tuner 306 receives.The digital signal that single-carrier signal processing unit 330 is handled from ADC 310.
More particularly, 3301 demodulation of SC demodulating unit are from the signal of the A/D conversion of the output of ADC 310, and the signal of generation demodulation.The signal of SC lock unit 3305 receiving demodulations produces synchronizing signal, and sends synchronizing signal to SC demodulating unit 3301.3302 equilibriums of SC equalizer are from the signal of the demodulation of SC demodulating unit 3301.3303 forward error corrections of SC-FEC unit are from the signal of the equilibrium of SC equalizer 3302.The signal of SC descrambler 3304 descrambling code forward error corrections produces mpeg stream, and sends mpeg stream to controller 320.
3401 demodulation of MC demodulating unit are from the signal of the A/D conversion of the output of ADC 310, and the signal of generation demodulation.The signal of MC lock unit 3405 receiving demodulations produces synchronizing signal, and sends synchronizing signal to MC demodulating unit 3401.3402 equilibriums of MC equalizer are from the signal of the demodulation of MC demodulating unit 3401.3403 forward error corrections of MC-FEC unit are from the signal of the equilibrium of MC equalizer 3402.The signal of MC descrambler 3404 descrambling code forward error corrections produces mpeg stream, and sends mpeg stream to controller 320.
Mpeg stream self comprises that a mpeg stream that decoding is shown is the customizing messages of good or bad rub-out signal by name (ERROR SIGNAL).Controller 320 detects one of at least the rub-out signal of at least one mpeg stream from single-carrier signal processing unit 330 and multi-carrier signal processing unit 340, determines the modulating mode of the signal of reception based on the rub-out signal of mpeg stream.Particularly, if do not detect this rub-out signal, then modulating mode determine it is correct, if detect this rub-out signal, then modulating mode determines it is wrong.
After the modulating mode of the signal that determine to receive, under the situation of single-carrier modulated pattern, controller 320 is selected single-carrier signal processing units 330 and is received mpeg stream from single-carrier signal processing unit 330 with output.3301 demodulation of SC demodulating unit are from the signal of the A/D conversion of ADC 310 outputs.The signal of SC lock unit 3305 receiving demodulations produces synchronizing signal, and sends synchronizing signal to SC demodulating unit 3301.3302 equilibriums of SC equalizer are from the signal of the demodulation of SC demodulating unit 3301.3303 forward error corrections of SC-FEC unit are from the signal of the equilibrium of SC equalizer 3302.Then, SC descrambler 3304 descrambling codes are from the signal of the forward error correction of SC-FEC unit 3303, and the generation mpeg stream.
Similarly, under the situation of multi-carrier modulation pattern, controller 320 is selected multi-carrier signal processing units 340 and is received mpeg stream from multi-carrier signal processing unit 340 with output.
In this way, digital multimedia signal receiver of the present invention can processing single-carrier modulated signal and multicarrier modulated signal.
Fig. 4 is the flow chart that illustrates according to the method for reseptance of the digital multimedia signal receiver of the embodiment of the invention.
At step S410, ADC 310 analog signal conversion of the reception of self-tuner 306 in the future becomes digital signal.
At step S420, the digital signal that single-carrier signal processing unit 330 is handled from ADC 310 produces mpeg stream; And the digital signal that multi-carrier signal processing unit 340 is handled from ADC 310 produces mpeg stream.
Next, at step S430, controller 320 is determined the modulating mode of the signal of reception according to the rub-out signal of mpeg stream.
Next, at step S440, if the modulating mode that detects is expressed as the single-carrier modulated pattern, then at step S450, controller 320 is selected single-carrier signal processing unit 330, thereby is sent to controller 320 with output from the mpeg stream of single-carrier signal processing unit 330 outputs.Otherwise if the modulating mode that detects is expressed as the multi-carrier modulation pattern, then at step S460, controller 320 is selected multi-carrier signal processing unit 340, thereby is sent to controller 320 with output from the mpeg stream of multi-carrier signal processing unit 340 outputs.
More particularly, at step S420,3301 demodulation of SC demodulating unit are from the signal of the A/D conversion of ADC 310 outputs.3302 equilibriums of SC equalizer are from the signal of the demodulation of SC demodulating unit 3301.3303 forward error corrections of SC-FEC unit are from the signal of the equilibrium of SC equalizer 3302.SC descrambler 3304 descrambling codes are from the signal of the forward error correction of SC-FEC unit 3303, and the generation mpeg stream.3401 demodulation of MC demodulating unit are from the signal of the A/D conversion of ADC 310 outputs.3402 equilibriums of MC equalizer are from the signal of the demodulation of MC demodulating unit 3401.3403 forward error corrections of MC-FEC unit are from the signal of the equilibrium of MC equalizer 3402.MC descrambler 3404 descrambling codes are from the signal of the forward error correction of MC-FEC unit 3403, and the generation mpeg stream.At step S430, controller 320 detects from SC descrambler 3304 and MC descrambler 3404 rub-out signal of at least one mpeg stream of output one of at least, and determines the modulating mode of the signal of reception based on the rub-out signal of mpeg stream.
In step S450, under the situation of single-carrier modulated pattern, controller 320 is selected single-carrier signal processing units 330 and is received mpeg stream from single-carrier signal processing unit 330 with output.3301 demodulation of SC demodulating unit are from the signal of the A/D conversion of ADC 310 outputs.The signal of SC lock unit 3305 receiving demodulations produces synchronizing signal, and sends synchronizing signal to SC demodulating unit 3301.3302 equilibriums of SC equalizer are from the signal of the demodulation of SC demodulating unit 3301.3303 forward error corrections of SC-FEC unit are from the signal of the equilibrium of SC equalizer 3302.Then, SC descrambler 3304 descrambling codes are from the signal of the forward error correction of SC-FEC unit 3303, and the generation mpeg stream.
At step S460, under the situation of multi-carrier modulation pattern, controller 320 is selected multi-carrier signal processing units 340 and is received mpeg stream from multi-carrier signal processing unit 340 with output.3401 demodulation of MC demodulating unit are from the signal of the A/D conversion of ADC 310 outputs.The signal of MC lock unit 3405 receiving demodulations produces synchronizing signal, and sends synchronizing signal to MC demodulating unit 3401.3402 equilibriums of MC equalizer are from the signal of the demodulation of MC demodulating unit 3401.3403 forward error corrections of MC-FEC unit are from the signal of the equilibrium of MC equalizer 3402.Then, MC descrambler 3404 descrambling codes are from the signal of the forward error correction of MC-FEC unit 3403, and the generation mpeg stream.
Find out that from the above description the digital multimedia signal receiver with said structure and method of reseptance can be located in one of reason single-carrier modulated signal and multicarrier modulated signal automatically according to the modulating mode of the signal that receives.
The above embodiments and advantage only are exemplary, should not be construed as limitation of the present invention.
Although show and the description certain embodiments of the invention, it should be appreciated by those skilled in the art, not breaking away under principle of the present invention, spirit and the situation, can make a change in an embodiment by claims and equivalent institute restricted portion.
Claims (5)
1, a kind of digital multimedia signal receiver that is used for processing single-carrier modulated signal and multicarrier modulated signal comprises:
ADC is used for one of any analog signal conversion of the single-carrier modulated pattern that will receive and multi-carrier modulation pattern and becomes digital signal;
The single-carrier signal processing unit is used for the processing single-carrier modulated signal;
The multi-carrier signal processing unit is used to handle multicarrier modulated signal; With
Controller is used for the modulating mode of the signal that determine to receive,
Wherein, controller detects one of at least at least one reference signal from single-carrier signal processing unit and multi-carrier signal processing unit, determine the modulating mode of the signal of reception according to reference signal, and when the modulating mode of digital signal is expressed as the single-carrier modulated pattern, receive mpeg stream with output from the single-carrier signal processing unit, and when the modulating mode of digital signal is expressed as multicarrier modulated signal, receive mpeg stream with output from the multi-carrier signal processing unit.
2, the receiver shown in claim 1, wherein, the single-carrier signal processing unit comprises: the SC demodulating unit is used for the digital signal of demodulation from ADC output; The SC lock unit is used to receive the signal from the demodulation of SC demodulating unit, produces synchronizing signal, and sends synchronizing signal to the SC demodulating unit; The SC equalizer is used for the signal of equilibrium from the demodulation of SC demodulating unit; The SC-FEC unit is used for the signal of forward error correction from the equilibrium of SC equalizer; With the SC descrambler, be used for the signal of descrambling code, and produce mpeg stream from the forward error correction of SC-FEC unit; And the multi-carrier signal processing unit comprises:
The MC demodulating unit is used for the digital signal of demodulation from ADC output; The MC lock unit is used to receive the signal from the demodulation of MC demodulating unit, produces synchronizing signal, and sends synchronizing signal to the MC demodulating unit; The MC equalizer is used for the signal of equilibrium from the demodulation of MC demodulating unit; The MC-FEC unit is used for the signal of forward error correction from the equilibrium of MC equalizer; With the MC descrambler, be used for the signal of descrambling code, and produce mpeg stream from the forward error correction of MC-FEC unit.
3, receiver as claimed in claim 2, wherein, controller one of at least detects the rub-out signal of at least one mpeg stream as the reference signal from SC descrambler and MC descrambler.
4, a kind of method of reseptance that is used for the digital multimedia receiver of processing single-carrier modulated signal and multicarrier modulated signal comprises step:
(a) analog signal conversion that receives is become digital signal;
(b) at the signal of single-carrier signal processing unit and multi-carrier signal processing unit for processing A/D conversion, and from each processing unit output mpeg stream;
(c) one of at least detect at least one reference signal from single-carrier signal processing unit and multi-carrier signal processing unit, and determine the modulating mode of the signal of reception according to reference signal;
(d), then receive mpeg stream with output from the single-carrier signal processing unit if the modulating mode of digital signal is expressed as the single-carrier modulated pattern; With
(e), then receive mpeg stream with output from the multi-carrier signal processing unit if the modulating mode of digital signal is expressed as the multi-carrier modulation pattern.
5, method as claimed in claim 4, wherein, at step (c), reference signal is the rub-out signal from the mpeg stream of step (b) output.
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| CNA2004100988188A CN1791193A (en) | 2004-12-17 | 2004-12-17 | Digital multimedia signal receiver and its receiving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102088633B (en) * | 2009-12-03 | 2012-11-21 | 承景科技股份有限公司 | Method for detecting carrier mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088633B (en) * | 2009-12-03 | 2012-11-21 | 承景科技股份有限公司 | Method for detecting carrier mode |
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