CN1791191A - Digital multimedia signal receiver and its channel pre-searching method - Google Patents
Digital multimedia signal receiver and its channel pre-searching method Download PDFInfo
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- CN1791191A CN1791191A CNA2004100988154A CN200410098815A CN1791191A CN 1791191 A CN1791191 A CN 1791191A CN A2004100988154 A CNA2004100988154 A CN A2004100988154A CN 200410098815 A CN200410098815 A CN 200410098815A CN 1791191 A CN1791191 A CN 1791191A
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Abstract
The digital multimedia signal receiver comprises: a tuner to receive signal with any one of single/multi-carrier mode; a ADC to convert the signal from tuner into digital format; a switch for signal from ADC; a single/multi-carrier treatment unit for signal from switch, and a controller to control the tuner to search channel, determine and store modulation mode can opposite channel, and generate switch control signal for switch.. This invention can let watch programs with different modulation modes.
Description
Technical field
The present invention relates generally to a kind of digital multimedia signal receiver and channel pre-searching method thereof that is used for the signal of processing single-carrier modulated signals and multi-carrier modulation, more particularly, relate to and a kind ofly can set up channel table and use its signal of handling multi-carrier modulation and the digital multimedia signal receiver of single-carrier modulated signals.
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, digit broadcasting system has been developed and has entered practicality.According to development so fast, in each country, various criterion has been proposed in digital broadcasting.
On December 24th, 1996, FCC (FCC) passed through the digital television standard of Advanced Television Systems Committee (ATSC) as TV broadcast 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 uses 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 cable broadcast 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 signal modulation.
In Europe, the frequency efficiency of Yin Qigao and antijamming capability and with COFDM (Coded Orthogonal Frequency Division Multiplexing (COFDM)) system applies in DVB-T (digital video broadcast-terrestrial).
Other use the DMB scheme of multiple modulator approach to be suggested, and all schemes can be divided into multi-carrier scheme and single-carrier scheme.Therefore, the conventional digital multimedia signal receiver is divided into multi-carrier digital multimedia signal receiver and single carrier digital multimedia signal receiver.
Fig. 1 is the schematic block diagram of expression 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 coming synchronous demodulator 130 by using from the signal of demodulator 130 or 140 outputs of FFT unit synchronously; Equalizer 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 equalizer 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 of expression 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; Equalizer 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 equalizer 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 signal receiver handle the digital multimedia signal of multi-carrier modulation and single-carrier modulated digital multimedia signal the two, that is, traditional digital multimedia signal 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 and a kind ofly can set up channel table and handle the signal of multi-carrier modulation and the digital multimedia signal receiver and the channel pre-searching method thereof of single-carrier modulated signals.
In order to realize the purpose of the invention described above, a kind of digital multimedia signal receiver that is used for the signal of processing single-carrier modulated signals and multi-carrier modulation is provided, comprise: tuner is used to receive any one multi-media signal of single-carrier modulated pattern and multi-carrier modulation pattern; ADC is used for the conversion of signals from tuner output is become digital signal; Diverter switch is used to switch the digital signal from ADC output; The single carrier processing unit is used to handle the digital signal from diverter switch output; The multicarrier processing unit is used to handle the digital signal from diverter switch output; And controller, be used to control the tuner search channel, determine modulating mode and corresponding channel, produce switch-over control signal with control its switch, and storage modulating mode and corresponding channel, wherein, diverter switch is forwarded to digital signal according to the switch-over control signal of slave controller output any of single carrier processing unit and multicarrier processing unit.
This digital multimedia signal receiver also comprises: indicating device, be used for receiving at least one detection signal from the single carrier processing unit, and the index signal of the corresponding modulating mode of channel of generation representative and multi-media signal, wherein, controller receives index signal from this indicating device, and modulating mode and corresponding channel are stored in the channel table.
This digital multimedia signal receiver also comprises: indicating device, be used for receiving at least one detection signal from the multicarrier processing unit, and the index signal of the corresponding modulating mode of channel of generation representative and multi-media signal, wherein, controller receives index signal from this indicating device, and modulating mode and corresponding channel are stored in the channel table.
This digital multimedia signal receiver also comprises: indicating device, be used for receiving at least one detection signal from one of single carrier processing unit and multicarrier processing unit, and the index signal of the corresponding modulating mode of channel of generation representative and multi-media signal, wherein, controller receives index signal from this indicating device, and modulating mode and corresponding channel are stored in the channel table.
This digital multimedia signal receiver also comprises: first indicating device is used for receiving first detection signal from the single carrier processing unit, and produces first index signal of the corresponding modulating mode of channel of representative and multi-media signal; With second indicating device, be used for receiving second detection signal from the multicarrier processing unit, and second index signal of the corresponding modulating mode of channel of generation representative and multi-media signal, wherein, controller correspondingly receives one of first and second index signals from one of first and second indicating devices, and modulating mode and corresponding channel are stored in the channel table.
The single carrier processing unit comprises: demodulator is used for the digital signal of demodulation from diverter switch output; Lock unit is used for by using from the signal Synchronization demodulator of the demodulation of demodulator output; Equalizer is used for the signal of equilibrium from the demodulation of demodulator output; The FEC unit is used for the signal execution forward error correction to the equilibrium of exporting from equalizer; And descrambler, be used for to from FEC unit output by the signal descrambling code of forward error correction obtaining mpeg stream, and wherein, the multicarrier processing unit comprises: demodulator is used for the digital signal of demodulation from diverter switch output; The FFT unit is used for the signal execution fast fourier transform to the demodulation of exporting from demodulator; Lock unit, be used for by use the demodulator output signal or from the output of FFT unit by the signal Synchronization demodulator of FFT conversion; Equalizer, be used for balanced from the output of FFT unit by the signal of FFT conversion; The FEC unit is used for the signal execution forward error correction to the equilibrium of exporting from equalizer; And descrambler, be used for to from FEC unit output by the signal descrambling code of forward error correction to obtain mpeg stream.
At least one detection signal be from lock unit output synchronous signal, from the signal of the equilibrium of equalizer output, from the output of FEC unit by the signal of forward error correction with from one of mpeg stream of descrambler output.
Controller comprises the memory that is used for the memory channel table.
But memory is flash memory or anyly can preserves the rewriting device of data under the non-transformer situation.
Controller detects from the PN sequence in the digital signal of ADC and/or at least one pilot tone, determines the modulating mode of the channel of multi-media signal, and modulating mode and respective channel are stored in the channel table.
In order to realize the purpose of the invention described above, a kind of channel pre-searching method that is used for the digital multimedia signal receiver of single-carrier modulated pattern and multi-carrier modulation pattern is provided, has comprised: a) received single-carrier modulated pattern and any one multi-media signal of multi-carrier modulation pattern and the order of pre-search; B) convert multi-media signal to digital signal; And c) determines modulating mode and the memory channel and the corresponding modulating mode of digital signal.
Step c) comprises following substep: c1) determine the channel of first modulating mode of digital signal according to first detection signal, and store this channel and first modulating mode; And c2) if the channel of first modulating mode determine finish, then determine the channel of second modulating mode of digital signal according to second detection signal, and store this channel and second modulating mode, wherein, first modulating mode is one of single-carrier modulated pattern and multi-carrier modulation pattern, and second modulating mode is wherein another.
Step c1) comprises following substep: first index signal that c3) produces the modulating mode of the channel of representing digital signal according to first detection signal; And c4) detects modulating mode according to first index signal, and store this modulating mode and corresponding channel.
Step c2) comprises following substep: second index signal that c5) produces the modulating mode of the channel of representing digital signal according to second detection signal; And c6) detects modulating mode according to second index signal, and store this modulating mode and corresponding channel.
Any of first detection signal and second detection signal is by one of the signal of forward error correction, synchronous signal, balanced signal and mpeg stream.
Step c1) and step c2) also comprise the steps: c7) detect from the PN sequence in the digital signal of ADC and/or at least one pilot tone; And c8) determines the modulating mode of the channel of multi-media signal, and modulating mode and respective channel are stored in the channel table.
Step c) comprises substep: according to the modulating mode of determining the channel of digital signal from the PN sequence in the digital signal of ADC and/or at least one pilot tone.
Description of drawings
The description that its preferred embodiment is carried out in conjunction with the drawings, above and other characteristics of the present invention will become apparent, wherein:
Fig. 1 is the schematic block diagram that shows according to the multi-carrier digital multimedia signal receiver of prior art;
Fig. 2 is the schematic block diagram that shows according to the single carrier digital multimedia signal receiver of prior art;
Fig. 3 is the schematic block diagram of expression according to the digital multimedia signal receiver of first embodiment of the invention;
Fig. 4 is the diagrammatic sketch of the detailed structure of the single carrier processing unit 340 of presentation graphs 3 and multicarrier processing unit 350;
Fig. 5 is the more detailed block diagram of structure of the controller of presentation graphs 3;
Fig. 6 a, 6b and 6c are illustrated in the processing that forms channel table in the memory of Fig. 5;
Fig. 7 a and 7b are respectively the exemplary diagram of structure of Frame of having represented wherein to insert the signal of the Frame of single-carrier modulated signals of PN sequence and multi-carrier modulation;
Fig. 8 is the schematic block diagram of expression according to the digital multimedia signal receiver of second embodiment of the invention;
Fig. 9 a and 9b are respectively formed according to the present invention and use the flow chart of the processing of channel table; With
Figure 10 is the flow chart of expression by the processing that forms channel table of the digital multimedia signal receiver execution of Fig. 3.
Embodiment
To be described in detail the embodiment of the invention now, its example shown in the accompanying drawings, wherein, identical label is represented same parts all the time.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
Fig. 3 is the schematic block diagram of expression according to the digital multimedia signal receiver of first embodiment of the invention.As shown in Figure 3, this digital multimedia signal receiver comprises: tuner 310, ADC 320, diverter switch 330, single carrier processing unit 340, multicarrier processing unit 350, indicating device 360, indicating device 370 and controller 380.
Tuner 310 receives digital multimedia signal and searches for the channel of this signal according to the channel selecting signal of slave controller 380 outputs.
ADC 320 will become digital signal from the conversion of signals of tuner 310 outputs.
Single carrier processing unit 340 is used for the digital multimedia signal of processing single-carrier modulated pattern, and multicarrier processing unit 350 is used to handle the digital multimedia signal of multi-carrier modulation pattern.The detailed structure of single carrier processing unit 340 and multicarrier processing unit 350 is described with reference to Fig. 4 after a while.
Indicating device 360 detects detection signal from single carrier processing unit 340, and produces index signal 1.On the other hand, indicating device 370 detects detection signal from multicarrier processing unit 350, and produces index signal 2 according to detection signal.
When receiving the user input commands of specific pre-search channel, controller 380 control tuners 310 all channels of search, detect the modulating mode of all channels, and in will the channel table of information stores in the memory that is preset in controller 380 (will in Fig. 5, describe) about the modulating mode of each channel.
More particularly, for example, when receiving the user input commands of specific pre-search channel, controller 380 initial control tuner 310 all channels of search, control its switch 330 is so that enter single carrier processing unit 340 from the digital signal of ADC320, and determines that according to the index signal 1 from indicating device 360 outputs the modulating mode of the signal of which channel is a single-carrier modulated.Subsequently, controller 380 control tuners 310 all channels of search, control its switch 330 is so that enter multicarrier processing unit 350 from the digital signal of ADC 320, and determines that according to the index signal 2 from indicating device 370 outputs the modulating mode of the signal of which channel is multi-carrier modulation.After aforesaid operations, the modulating mode of all channels is determined, and is stored in the channel table in the memory that is preset in controller 380.In addition, when the user selected a certain channel, controller 380 was searched for the corresponding modulating pattern of the channel of current selection in channel table, then, switch to suitable processing unit according to Search Results control its switch 330.
Above embodiment only is exemplary, can do various replacements, conversion and modification to above embodiment.For example, use to receive from the detection signal of single carrier processing unit 340 with from the two only indicating device of the detection signal of multicarrier processing unit 350.
Fig. 4 is the diagrammatic sketch of the detailed structure of the single carrier processing unit 340 of presentation graphs 3 and multicarrier processing unit 350.
As shown in Figure 4, single carrier processing unit 340 comprises: demodulator 4301, synchronous (sync) unit 4401, equalizer 4501, FEC unit 4601 and descrambler 4701.Demodulator 4301, synchronous (sync) unit 4401, equalizer 4501, FEC unit 4601 and descrambler 4701 are identical with corresponding parts among Fig. 2, therefore omit the description to it here.
With reference to Fig. 4, as an example, indicating device 360 detects detection signal.In this case, this detection signal be from FEC unit 4601 by the signal BER of forward error correction (bit error rate).If BER is less than predetermined threshold, promptly correct processing unit just be used or the accepting state of single carrier processing unit 340 good, then indicating device 360 is set to index signal 1 of " height " and output corresponding " height ".If BER is greater than predetermined threshold, promptly Cuo Wu processing unit just be used or accepting state bad, then indicating device 360 is set to index signal 1 of " low " and output corresponding " low ".According to index signal 1, controller 380 can determine whether the modulating mode of the signal of channel is single-carrier modulated.
On the other hand, indicating device 360 receives signal from lock unit 4401, equalizer 4501 or descrambler 4701 as detection signal.In these detection signals, can use single detection signal or can use their combination according to specified conditions and requirement, therefore, can use only one or more indicating devices 360.Indicating device 370 is worked in the mode identical with indicating device 360, and difference only is that detection signal receives from multicarrier processing unit 350, so omit the description to it here.
In addition, the signal attribute of any other indication modulating mode also can be used to discern the modulating mode of the digital multimedia signal of reception.
Fig. 5 is the more detailed block diagram of expression according to the structure of the controller of Fig. 3 of first embodiment of the invention.As shown in Figure 5, controller comprises: processor (CPU) 500 and memory 510.
When receiving the user input commands of specific pre-search channel, processor 500 initial delivery channels are selected signal to change channel with control tuner 310 by order and are searched for all channels, control its switch 330 is so that enter single carrier processing unit 340 (being the default process unit) from the digital signal of ADC 320, determine that according to index signal 1 modulating mode of the signal of which channel is a single-carrier modulated, and relevant Channel Modulation pattern information is stored in the channel table that is preset in the memory 510 from indicating device 360 outputs.Subsequently, processor 500 output switch-over control signals switch to multicarrier processing unit 350 (being another processing unit) with control its switch 330, delivery channel is selected signal to change channel with control tuner 310 by order and is searched for all channels, determine that according to index signal 2 modulating mode of the signal of which channel is a multi-carrier modulation, and relevant Channel Modulation pattern information is stored in the channel table that is preset in the memory 510 from indicating device 370 outputs.After aforesaid operations, channel table forms.
When user's selective channel, processor 500 delivery channels select signal to select this channel with control tuner 310, in channel table, search for the corresponding modulating pattern of the channel of current selection, and switch to the processing unit corresponding with control its switch 330 with the modulating mode of the channel of selecting according to Search Results output switch-over control signal.
Memory 510 memory channel tables, but can be flash memory or anyly can under the non-transformer situation, preserve the rewriting device of data.
Fig. 6 a, 6b and 6c are illustrated in the processing that forms channel table in the memory of Fig. 5.
With reference to Fig. 3,6a, 6b and 6c, suppose that digital multimedia signal receiver receives 6 channels altogether.At first, can not use, as shown in (a) about the information of channel with about the information of their corresponding modulating modes.
When the user imports the order of pre-search channel, controller 380 control tuners 310 all channels of search, control its switch 330 is so that enter single carrier processing unit 340 from the digital signal of ADC 320, determine the channel of single-carrier modulated pattern according to index signal 1, and be that the single-carrier modulated pattern storage is in channel table channel and the modulating mode of determining.At this moment, the channel table of acquisition is as shown in (b).
Subsequently, controller 380 control its switch 330 switch to multicarrier processing unit 350, control tuner 310 is searched for all channels once more, control its switch 330 is so that enter multicarrier processing unit 350 from the digital signal of ADC 320, determine the channel of multi-carrier modulation patterns according to index signal 2, and be that the multi-carrier modulation pattern storage is in channel table the channel and the modulating mode thereof of multi-carrier modulation pattern.At this moment, channel table forms, and becomes as shown in (c).
Fig. 7 a and 7b are respectively the exemplary diagram of structure of Frame of having represented wherein to insert the signal of the Frame of single-carrier modulated signals of PN sequence and multi-carrier modulation.
Fig. 7 a shows the structure of the Frame of single-carrier modulated signals.The structure of the Frame of the signal of Fig. 7 b demonstration multi-carrier modulation.Obviously, the PN sequence that is inserted in the single-carrier modulated signals is very inequality with the PN sequence in the signal that is inserted in multi-carrier modulation.
Fig. 8 is the schematic block diagram of expression according to the digital multimedia signal receiver of second embodiment of the invention.With reference to Fig. 8, this digital multimedia signal receiver comprises: tuner 810, ADC 820, diverter switch 830, single carrier processing unit 840, multicarrier processing unit 850 and controller 860.Because tuner 810, ADC 820, diverter switch 830, single carrier processing unit 840 and multicarrier processing unit 850 are identical with corresponding component among Fig. 3, so omit description here to it.
Controller 860 is from ADC 820 receiving digital signals.Controller 860 is according to the modulating mode of the PN Sequence Detection signal as shown in Fig. 7 a and 7b.When using the modulating mode of PN Sequence Detection signal, controller 860 reads the PN sequence from the header from the Frame of the digital signal of ADC 820 outputs.Then, the PN sequence that controller 860 will read from the Frame of signal be stored in default the controller 860 corresponding to multi-carrier modulation signal and the PN sequence of single-carrier modulated signals relatively, with the PN sequence determining to read corresponding to which the default PN sequence that is stored in the controller 860.In the present embodiment, all channels searched only once after, channel table forms.
Except that the PN sequence, the identifying information of other kinds also can be used for determining the modulating mode of channel such as pilot tone.Under the situation of pilot tone, by calculating the pilot tone peak value and from the difference power between the average power content of the signal of ADC 820 outputs and judge that the difference power that calculates is in to the default scope of the signal of multi-carrier modulation or in to the default scope of single-carrier modulated signals, the modulating mode of controller 860 detection signals.Pilot tone can be one or more than one.
Those skilled in the art can understand easily, and these two kinds of identifying informations can use separately or together.
Fig. 9 a and 9b are respectively formed according to the present invention and use the flow chart of the processing of channel table.
With reference to Fig. 9 a, in step S900, the user imports the order of specific pre-search channel.In step S910, controller 380 (or controller 860) control tuner 310 (or tuner 810) is searched for all channels, and determines the modulating mode of all channels according to index signal.Then, in step S920, controller 380 (or controller 860) is stored in relevant information in the channel table that is preset in the memory.
With reference to Fig. 9 b, in step S930, user's selective channel.In step S940, controller 380 (or controller 860) is search and the corresponding modulation system of selecting of channel in predetermined channel table.Here, Yu Ding channel table can be the channel table that forms in step S920.At last, in step S950, controller 380 (or controller 860) switches to suitable processing unit according to Search Results control its switch 330 (or diverter switch 830).
The operation that is formed channel table by the digital multimedia signal receiver of Fig. 3 is described now with reference to Figure 10.
Figure 10 is the flow chart of expression by the processing that forms channel table of the digital multimedia signal receiver execution of Fig. 3.
With reference to Figure 10, in step S1000, the user imports the order of specific pre-search channel.In step S1005, channel of controller 380 control tuners, 310 search.Then, in step S1010, controller 380 determines whether the index signal 1 from indicating device 360 is " 1 ".Here, index signal can be other forms.If determine that at step S1010 middle controller 380 index signal 1 is " 1 ", the modulating mode of then determining current channel in step S1015 is the single-carrier modulated pattern, and in step S1020, this channel and modulation mode information thereof are stored in the channel table.If determine that at step S1010 middle controller 380 index signal 1 is not " 1 ", then in channel table, do not store any information.In step S1025, controller 380 judges whether that all channels are searched.If determine that at step S1025 middle controller 380 not all channel is searched, then at step S1030 middle controller 380 control tuners 310 another channels of search, and repeating step S1010 is to S1025.If determine that at step S1025 middle controller 380 all channels are searched, then switch to multicarrier processing unit 350 in step S1035 middle controller 380 control its switch 330.In step S1040, channel of controller 380 control tuners, 310 search.Then, in step S1045, controller 380 determines whether index signal 2 is " 1 ".If determine that at step S1045 middle controller 380 index signal 2 from indicating device 370 is " 1 ", the modulating mode of then determining current channel in step S1050 is the multi-carrier modulation pattern, and in step S1055, this channel and modulation mode information thereof are stored in the channel table.If determine that at step S1045 middle controller 380 index signal 2 is not " 1 ", then in channel table, do not store any information.In step S1060, controller 380 judges whether that all channels are searched.If determine that at step S1060 middle controller 380 not all channel is searched, then at step S1065 middle controller 380 control tuners 310 another channels of search, then, repeating step S1045 is to S1060.If determine that at step S1060 middle controller 380 all channels are searched, then processing finishes.
Here, according to from the single-carrier modulated unit or the combination by one of the signal of forward error correction, synchronous signal, balanced signal and mpeg stream or these signals of extracting of multi-carrier modulation unit obtain index signal.
But signal according to digital multimedia signal receiver processing single-carrier modulated signals of the present invention and multi-carrier modulation.Especially, digital multimedia signal receiver of the present invention can be stored in all channels and modulation mode information thereof in the channel table by the operation of pre-search channel.In this way, when user's selective channel, digital multimedia signal receiver of the present invention can be searched for the corresponding modulating mode of the channel of selecting and select suitable processing unit automatically in channel table, this makes and can watch the program of different modulating pattern and the high efficiency of switching between various modulating mode processing units is provided.
The foregoing description and advantage only are exemplary, should not be interpreted as limiting the present invention.The present invention can easily be applied to the equipment of other types.In addition, also be exemplary to the description of the embodiment of the invention, should not limit the scope of claim, very clear, those skilled in the art can carry out various replacements, conversion and revise.
Claims (20)
1, a kind of digital multimedia signal receiver that is used for the signal of processing single-carrier modulated signals and multi-carrier modulation comprises:
Tuner is used to receive any one multi-media signal of single-carrier modulated pattern and multi-carrier modulation pattern;
ADC is used for the conversion of signals from tuner output is become digital signal;
Diverter switch is used to switch the digital signal from ADC output;
The single carrier processing unit is used to handle the digital signal from diverter switch output;
The multicarrier processing unit is used to handle the digital signal from diverter switch output; With
Controller is used to control the tuner search channel, determines modulating mode and corresponding channel, produces switch-over control signal with control its switch, and storage modulating mode and corresponding channel,
Wherein, diverter switch is forwarded to digital signal according to the switch-over control signal of slave controller output any of single carrier processing unit and multicarrier processing unit.
2, digital multimedia signal receiver as claimed in claim 1 also comprises:
Indicating device is used for receiving at least one detection signal from the single carrier processing unit, and produces the index signal of the corresponding modulating mode of channel of representative and multi-media signal,
Wherein, controller receives index signal from this indicating device, and modulating mode and corresponding channel are stored in the channel table.
3, digital multimedia signal receiver as claimed in claim 1 also comprises:
Indicating device is used for receiving at least one detection signal from the multicarrier processing unit, and produces the index signal of the corresponding modulating mode of channel of representative and multi-media signal,
Wherein, controller receives index signal from this indicating device, and modulating mode and corresponding channel are stored in the channel table.
4, digital multimedia signal receiver as claimed in claim 1 also comprises:
Indicating device is used for receiving at least one detection signal from one of single carrier processing unit and multicarrier processing unit, and produces the index signal of the corresponding modulating mode of channel of representative and multi-media signal,
Wherein, controller receives index signal from this indicating device, and modulating mode and corresponding channel are stored in the channel table.
5, digital multimedia signal receiver as claimed in claim 1 also comprises:
First indicating device is used for receiving first detection signal from the single carrier processing unit, and produces first index signal of the corresponding modulating mode of channel of representative and multi-media signal; With
Second indicating device is used for receiving second detection signal from the multicarrier processing unit, and produces second index signal of the corresponding modulating mode of channel of representative and multi-media signal,
Wherein, controller correspondingly receives one of first and second index signals from one of first and second indicating devices, and modulating mode and corresponding channel are stored in the channel table.
6, as any described digital multimedia signal receiver of above-mentioned claim, wherein, the single carrier processing unit comprises:
Demodulator is used for the digital signal of demodulation from diverter switch output;
Lock unit is used for by using from the signal Synchronization demodulator of the demodulation of demodulator output;
Equalizer is used for the signal of equilibrium from the demodulation of demodulator output;
The FEC unit is used for the signal execution forward error correction to the equilibrium of exporting from equalizer; With
Descrambler, be used for to from FEC unit output by the signal descrambling code of forward error correction obtaining mpeg stream, and
Wherein, the multicarrier processing unit comprises:
Demodulator is used for the digital signal of demodulation from diverter switch output;
The FFT unit is used for the signal execution fast fourier transform to the demodulation of exporting from demodulator;
Lock unit, be used for by use the demodulator output signal or from the output of FFT unit by the signal Synchronization demodulator of FFT conversion;
Equalizer, be used for balanced from the output of FFT unit by the signal of FFT conversion;
The FEC unit is used for the signal execution forward error correction to the equilibrium of exporting from equalizer; With
Descrambler, be used for to from FEC unit output by the signal descrambling code of forward error correction to obtain mpeg stream.
7, arrive the described digital multimedia signal receiver of claim 5 as claim 2, wherein, at least one detection signal be from lock unit output synchronous signal, from the signal of the equilibrium of equalizer output, from the output of FEC unit by the signal of forward error correction with from one of mpeg stream of descrambler output.
8, digital multimedia signal receiver as claimed in claim 1, wherein, controller comprises the memory that is used for the memory channel table.
9, digital multimedia signal receiver as claimed in claim 8, wherein, but memory is flash memory or anyly can preserves the rewriting device of data under the non-transformer situation.
10, digital multimedia signal receiver as claimed in claim 1, wherein, controller detects from the PN sequence in the digital signal of ADC and/or at least one pilot tone, determines the modulating mode of the channel of multi-media signal, and modulating mode and respective channel are stored in the channel table.
11, digital multimedia signal receiver as claimed in claim 10, wherein, the single carrier processing unit comprises:
Demodulator is used for the digital signal of demodulation from diverter switch output;
Lock unit is used for by using from the signal Synchronization demodulator of the demodulation of demodulator output;
Equalizer is used for the signal of equilibrium from the demodulation of demodulator output;
The FEC unit is used for the signal execution forward error correction to the equilibrium of exporting from equalizer; With
Descrambler, be used for to from FEC unit output by the signal descrambling code of forward error correction obtaining mpeg stream, and
Wherein, the multicarrier processing unit comprises:
Demodulator is used for the digital signal of demodulation from diverter switch output;
The FFT unit is used for the signal execution fast fourier transform to the demodulation of exporting from demodulator;
Lock unit, be used for by use the demodulator output signal or from the output of FFT unit by the signal Synchronization demodulator of FFT conversion;
Equalizer, be used for balanced from the output of FFT unit by the signal of FFT conversion;
The FEC unit is used for the signal execution forward error correction to the equilibrium of exporting from equalizer; With
Descrambler, be used for to from FEC unit output by the signal descrambling code of forward error correction to obtain mpeg stream.
12, as claim 10 or 11 described digital multimedia signal receivers, wherein, controller comprises the memory that is used for the memory channel table.
13, digital multimedia signal receiver as claimed in claim 12, wherein, but memory is flash memory or anyly can preserves the rewriting device of data under the non-transformer situation.
14, a kind of channel pre-searching method that is used for the digital multimedia signal receiver of single-carrier modulated pattern and multi-carrier modulation pattern comprises the steps:
A) receive single-carrier modulated pattern and any one multi-media signal of multi-carrier modulation pattern and the order of pre-search;
B) convert multi-media signal to digital signal; With
C) determine modulating mode and the memory channel and the corresponding modulating mode of digital signal.
15, method as claimed in claim 14, wherein, step c) comprises following substep:
C1) determine the channel of first modulating mode of digital signal according to first detection signal, and store this channel and first modulating mode; With
C2) if the channel of first modulating mode determine finish, then determine the channel of second modulating mode of digital signal, and store this channel and second modulating mode according to second detection signal,
Wherein, first modulating mode is one of single-carrier modulated pattern and multi-carrier modulation pattern, and second modulating mode is wherein another.
16, method as claimed in claim 15, wherein, step c1) comprise following substep:
C3) produce first index signal of the modulating mode of the channel represent digital signal according to first detection signal; With
C4) detect modulating mode according to first index signal, and store this modulating mode and corresponding channel.
17, method as claimed in claim 15, wherein, step c2) comprise following substep:
C5) produce second index signal of the modulating mode of the channel represent digital signal according to second detection signal; With
C6) detect modulating mode according to second index signal, and store this modulating mode and corresponding channel.
18, as claim 16 or 17 described methods, wherein, any of first detection signal and second detection signal is by one of the signal of forward error correction, synchronous signal, balanced signal and mpeg stream.
19, method as claimed in claim 15, wherein, step c1) and step c2) also comprise the steps:
C7) detect from the PN sequence in the digital signal of ADC and/or at least one pilot tone; With
C8) determine the modulating mode of the channel of multi-media signal, and modulating mode and respective channel are stored in the channel table.
20, method as claimed in claim 14, wherein, step c) comprises substep:
According to the modulating mode of determining the channel of digital signal from the PN sequence in the digital signal of ADC and/or at least one pilot tone.
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| CNA2004100988154A CN1791191A (en) | 2004-12-17 | 2004-12-17 | Digital multimedia signal receiver and its channel pre-searching method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106446B (en) * | 2006-07-10 | 2010-08-25 | 三星电机株式会社 | Dual-system transmitting and receiving device |
| WO2012055180A1 (en) * | 2010-10-28 | 2012-05-03 | 中兴通讯股份有限公司 | Method, apparatus, system and device for processing multiple- tv-standard signals |
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2004
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106446B (en) * | 2006-07-10 | 2010-08-25 | 三星电机株式会社 | Dual-system transmitting and receiving device |
| WO2012055180A1 (en) * | 2010-10-28 | 2012-05-03 | 中兴通讯股份有限公司 | Method, apparatus, system and device for processing multiple- tv-standard signals |
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