CN102064767B - Frequency conversion device, conversion method, and filter thereof - Google Patents
Frequency conversion device, conversion method, and filter thereof Download PDFInfo
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Abstract
The invention relates to a frequency conversion device, a frequency conversion method and a filter thereof. The frequency conversion device comprises an analogue-digital converter, a symbol conversion circuit, a first switch module, a filter and a second switch module, wherein the analogue-digital converter is used for sampling an input signal according to a sampling frequency to generate a firstdigital signal, wherein the sampling frequency is in a corresponding relation with the frequency of the input signal; the symbol conversion circuit is used for performing symbol conversion on the first digital signal to generate a second digital signal; the first switch module is used for selecting one of the first digital signal and the second digital signal to serve as an output signal according to the sampling frequency; the filter is used for receiving and filtering the output signal to generate a filter signal; and the second switch module is used for outputting the filter signal to a first output path or a second output path alternately according to the sampling frequency. Thus, the frequency conversion device reduces the use of a filter and an analogue-digital converter by the corresponding relation between the sampling frequency and the input signal and reduces the area of a circuit. Therefore, the cost is reduced.
Description
Technical field
The present invention relates to a kind of conversion equipment and conversion method thereof, particularly relate to a kind of frequency conversion apparatus and conversion method thereof.
Background technology
For radio communication product, its primary clustering generally includes conveyer and receiver two parts, and the present invention is partly innovated at receiver.Be example with present television system, tuner in the television system mainly contains two big classes, one is the intermediate frequency signal output framework of traditional iron-clad tuner (CAN tuner), another kind of for generally being used in zero intermediate frequency (Zero IF) framework of silicon tuner (silicon tuner), so the frequency conversion apparatus in the demodulation process circuit of tuner rear end must be supported this two kinds of input signals simultaneously, be intermediate frequency input signal and fundamental frequency input signal, see also Fig. 1, be the calcspar of the frequency conversion apparatus with intermediate frequency signal input of prior art.As shown in the figure, the frequency conversion apparatus 10 ' of prior art comprises an analog-digital converter 12 ', one first multiplier 14 ', one second multiplier 16 ', an oscillator 18 ', one first filter 24 ' and one second filter 26 '.The intermediate frequency signal that analog-digital converter 12 ' receiver turning 1 ' is exported, and according to sampling frequency fs conversion intermediate frequency signal, produce a digital signal, and be sent to first multiplier 14 ' and second multiplier 16 ', first multiplier 14 ' and second multiplier 16 are after respectively digital signal being multiplied by a cosine signal and a dextrorotation signal, and intermediate frequency signal is reduced to baseband signal, and be sent to first filter 24 ' and second filter 26 ', and produce I signal and Q signal, use for subsequent conditioning circuit.
Because the demodulation process circuit must be supported intermediate frequency signal and the baseband signal of tuner 1 ' output simultaneously, so the frequency conversion apparatus 10 ' of demodulation process circuit such as non-employing Fig. 1 namely is to adopt the frequency converter that can receive the fundamental frequency input signal.No matter which kind of frequency conversion apparatus during employing is above-mentioned all must have two filters, and this makes that all the area of demodulation process circuit is high, and all can be reflected on the cost.
Prior art:
10 ' frequency conversion apparatus
12 ' analog-digital converter
14 ' first multiplier
16 ' second multiplier
18 ' oscillator
24 ' first filter
26 ' second filter
The present invention:
10 frequency conversion apparatus
12 analog-digital converters
14 multipliers
16 switches
18 filters
180 first Postponement modules
1,800 first delay cells
181 second Postponement modules
1,810 second delay cells
183 first addition modules
1,830 first adder units
184 first multiplier modules
185 second multiplier modules
186 second addition modules
187 the 3rd addition modules
20 switch modules
22 first switches
24 second switches
30 frequency conversion apparatus
32 switches
34 analog-digital converters
36 filters
38 switch modules
40 frequency conversion apparatus
42 first switches
44 analog-digital converters
46 filters
47 switch modules
48 multipliers
49 second switches
50 first gates
52 second gates
54 inverters
Summary of the invention
One of purpose of the present invention is to provide a kind of frequency conversion apparatus and conversion method thereof, and it reduces the use of filter, and reduces the area of circuit, and then saves cost.
One of purpose of the present invention is to provide a kind of frequency conversion apparatus and conversion method thereof, and it reduces the use of analog-digital converter, and reduces complexity and the area of circuit, and then saves cost.
One of purpose of the present invention is to provide a kind of frequency conversion apparatus and conversion method thereof, and it does not use mixer, and reduces complexity and the area of circuit, and then saves cost.
One of purpose of the present invention is to provide a kind of frequency conversion apparatus and conversion method thereof, and it can support intermediate frequency signal and the baseband signal of tuner output simultaneously, and reduces the area of circuit, and then saves cost, and promotes usefulness.
Frequency conversion apparatus of the present invention comprises an analog-digital converter, a symbol transition circuit, one first switch module, a filter and a second switch module.Analog-digital converter receives and the input signal of taking a sample according to a sampling frequency, to produce one first digital signal, wherein, between the frequency of sampling frequency and input signal one corresponding relation is arranged, the symbol transition circuit receives first digital signal, and first digital signal carried out a symbol transition, and produce one second digital signal, first switch module select first digital signal and second digital signal in order to the foundation sampling frequency one of them as an output signal, filter receives and the filtering output signal, and produce a filtering signal, the second switch module is in order to the foundation sampling frequency, and alternately exports output signal to one first outgoing route or one second outgoing route.So, can reduce the use of a filter and analog-digital converter, and reduce the area of circuit, and then save cost.
Moreover frequency conversion apparatus of the present invention also comprises one the 3rd switch module and and switches control module.The 3rd switch module is coupled to analog-digital converter, and switch the control signal according to sampling frequency and and import between the path in one first input path and one second and switch, and the reception input signal, and will be sent to analog-digital converter by the input signal that the first input path or the second input path receive, wherein, the 3rd switch module also can stop to switch according to the switching controls signal, import the signal that receive in the path and only transmit by first, the switching controls module is in order to produce the switching controls signal in first switch module and the 3rd switch module, to control the switching of first switch module and the 3rd switch module.So, frequency conversion apparatus of the present invention can be supported intermediate frequency signal and the baseband signal of tuner output simultaneously, and reduces the area of circuit, and then saves cost, and promotes usefulness.
The invention provides a kind of frequency conversion apparatus, it comprises: an analog-digital converter, receive and the input signal of taking a sample according to a sampling frequency, and to produce one first digital signal, wherein, between the frequency of this sampling frequency and this input signal one corresponding relation is arranged; One symbol transition circuit in order to receiving this first digital signal, and carries out a symbol transition to it, and produces one second digital signal; One first switch module, in order to according to this sampling frequency, one of them that select this first digital signal and this second digital signal is as an output signal; One filter is coupled to this first switch module, in order to filtering this output signal from this first switch module, and produces one first filtering signal and one second filtering signal; And a second switch module, be coupled to this filter, in order to according to this sampling frequency, alternately export this first filtering signal and this second filtering signal to one first outgoing route or one second outgoing route.
The present invention also provides a kind of frequency conversion method, its step comprises: one first input path is provided, according to one first sampling frequency, and reception and sampling are from one first input signal in this first input path, to produce one first digital signal, wherein, this first sampling frequency has a corresponding relation with the frequency of this first input signal; This first digital signal is carried out a symbol transition, and produce one second digital signal; One at least in this first digital signal of filtering and this second digital signal, and produce one first filtering signal and one second filtering signal; And export this first filtering signal and this second filtering signal to one first outgoing route and one second outgoing route respectively.
The present invention also provides a kind of frequency conversion apparatus, it comprises: one first switch module, switch between one first input path and one second input path according to a sampling frequency, and receive one first input signal or one second input signal, and transmit this first input signal and this second input signal; One analog-digital converter receives and take a sample this first input signal or this second input signal according to this sampling frequency, to produce one first digital signal, wherein, between the frequency of this sampling frequency and this input signal one corresponding relation is arranged; One filter is coupled to this analog-digital converter, in order to receive and filtering from this first digital signal of this analog-digital converter, and produce one first filtering signal and one second filtering signal; And a second switch module, be coupled to this filter, according to this sampling frequency, alternately export this first filtering signal and this second filtering signal to one first outgoing route and one second outgoing route.
The present invention also provides a kind of frequency conversion method, its step comprises: one first input path and one second input path are provided, according to a sampling frequency, and switch and receive one first input signal and one second input signal that transmit in this first input path or this second input path; According to this sampling frequency, and receive and take a sample this first input signal and this second input signal, to produce one first digital signal, wherein, this sampling frequency and this first input signal have a corresponding relation with the frequency of this second input signal; This first digital signal of filtering, and produce one first filtering signal and one second filtering signal; And export this first filtering signal and this second filtering signal to one first outgoing route and one second outgoing route respectively.
Description of drawings
Fig. 1 is the calcspar of the frequency conversion apparatus with intermediate frequency signal input of prior art;
Fig. 2 is the calcspar of a preferred embodiment of the present invention;
Fig. 3 is the calcspar of the finite impulse response filter of a preferred embodiment of the present invention;
Fig. 4 is the calcspar of another preferred embodiment of the present invention; And
Fig. 5 is the calcspar of another preferred embodiment of the present invention.
The reference numeral explanation
Embodiment
See also Fig. 2, be the calcspar of a preferred embodiment of the present invention.As shown in the figure, frequency conversion apparatus 10 of the present invention comprises an analog-digital converter 12, a symbol transition circuit 14, a switch 16, a filter 18 and a switch module 20.Analog-digital converter 12 receives an input signal, and according to a sampling frequency fs of the sample signal input signal of taking a sample, and produce one first digital signal.Wherein, input signal is an output signal of a tuner 1, and input signal can be an intermediate frequency signal, and analog-digital converter 12 outputs first digital signal is to switch 16 and symbol transition circuit 14.Symbol transition circuit 14 receives first digital signal, and first digital signal is carried out a symbol transition, and produces one second digital signal, and namely in first embodiment, 14 pairs of first digital signals of symbol transition circuit carry out the sign conversion; In second embodiment, symbol transition circuit 14 can be 1 ' s complement code (1 ' scomplement) circuit; In the 3rd embodiment, multiplier 14 can be 1 ' s complement code (2 ' s complement) circuit.In addition, symbol transition circuit 14 also can be a multiplier, and it is in order to multiply by a negative with first digital signal, and produces second digital signal.
The speed of the sampling frequency (fs/2) of switch 16 foundations 1/2nd is switched, one of them that select first digital signal and second digital signal is as an output signal, be about to first digital signal or second digital signal and be sent to filter 18 to carry out the filtering processing, as: low-pass filtering, and produce one first filtering signal and one second filtering signal respectively.Switch module 20 is coupled to filter 18, switch module 20 is in order to the foundation sampling frequency, alternately export the filtering signal to one first outgoing route or one second outgoing route, be that switch module 20 carries out the switch switching according to sampling frequency fs, so that with the first filtering signal and the second filtering signal as an output signal of frequency converter 10 and exported, wherein, first outgoing route and second outgoing route are respectively a homophase (I) outgoing route or a quadrature (Q) outgoing route.Switch module 20 comprises one first switch 22 and a second switch 24.First switch 22 is in order to be the I signal from the filter 18 switching first filtering signals or the second filtering signal, and second output dip switch 24 is in order to switch the first filtering signals or the second filtering signal as the Q signal from filter 18.
Known to holding, the sampling frequency fs of analog-digital converter 12 need meet following equation;
N sampling frequency (f
s) ± intermediate frequency signal (f
If)=sampling frequency (fs)/4
Wherein n is arbitrary integer, if during n=-1, sampling frequency fs=4x (fIF/5) then, the data volume of needs was selected suitable numerical value when wherein the selection of n can be handled according to the standard of analog-digital converter 10 and follow-up data treatment circuit (not shown), and learnt the sampling frequency fs of analog-digital converter 12.In a preferred embodiment, the numerical value of n generally all adopts-1,0 and 1.In an embodiment, the frequency of selected input signal equals the sampling frequency of 1/4th sample signal, and namely the frequency of digital intermediate frequency is f
DIF=fs/4, so cosine and sinusoidal sequence that oscillator 18 ' (as shown in Figure 1) produces can be reduced to 0,1,0, the sequence of-1...., therefore, the present invention can omit the multiplier 14 ' and 16 ' of the prior art of Fig. 1, and uses filter 18 to replace first filter 24 ' and second filter 26 ' of the prior art of Fig. 1.Certainly, in another embodiment, so, can reduce the area of circuit, and then save cost.Moreover, because sequence (0,1,0 ,-1...) with sequence (1,0,-1,0...) represent dextrorotation and cosine sequences respectively, so two sequences can be merged into a sequence (1,1 ,-1 ,-1...), therefore, the switching frequency of first switch 16 switches to obtain first digital signal or second digital signal according to 1/2nd sampling frequency (fs/2), and is sent to filter 18, so that while filtering I signal and Q signal.Above-mentioned modus operandi only needs a multiplier and a filter, can realize, so also relatively save many on cost.
In an embodiment, filter 18 can be a finite impulse response (FIR) (Finite Impulse Response, FIR) filter, with filtering first digital signal or second digital signal, in addition, because filter 18 has symmetry, so filter 18 uses one have the finite impulse response filter of symmetry coefficient.
See also Fig. 3, be the calcspar of the finite impulse response filter of a preferred embodiment of the present invention.As shown in the figure, filter 18 of the present invention comprises one first Postponement module 180, one second Postponement module 181, one first addition module 183, one first multiplier module 184, one second multiplier module 185, one second addition module 186 and one the 3rd addition module 187.Wherein, first Postponement module 180, second Postponement module 181 and first addition module 183 comprise a plurality of first delay cells 1800, a plurality of second delay cell 1810 and a plurality of the 3rd adder units 1830 respectively.
See also Fig. 4, be the calcspar of another preferred embodiment of the present invention.As shown in the figure, the embodiment difference of the frequency conversion apparatus of present embodiment 30 and Fig. 2 is that present embodiment is to be applied to receive baseband signal and to carry out frequency inverted.Present embodiment comprises a switch 32, an analog-digital converter 34, a filter 36 and a switch module 38.Switch 32 is according to sampling frequency f
sIn between one first input path and one second input path, switch, import the path and receive one first input signal or one second input signal and receive respectively the corresponding first input path and second, and transmit first input signal and second input signal to analog-digital converter 34, when analog-digital converter 34 receives first input signal or second input signal, then according to sampling frequency f
sTake a sample first input signal or second input signal, to produce one first digital signal, wherein, sampling frequency and first input signal namely have a corresponding relation between the frequency of second input signal, namely sampling frequency be first input signal or second input signal frequency 1/4th.
Embodiment with Fig. 2, since sampling frequency be first input signal or second input signal frequency 1/4th, therefore, the present invention is switched first input signal and second input signal by switch 32 according to sampling frequency, to reach the use of saving an analog-digital converter and a filter, and complexity and the area of minimizing circuit, and then save cost.
See also Fig. 5, be the calcspar of another preferred embodiment of the present invention.As shown in the figure, different the locating of embodiment of the frequency conversion apparatus 40 of present embodiment and Fig. 2 and Fig. 4 can be applied to receive intermediate frequency signal and baseband signal simultaneously with present embodiment and changing.The frequency conversion apparatus 40 of present embodiment comprises one first switch 42, an analog-digital converter 44, a filter 46 and a switch module 47, a multiplier 48, a second switch 49, one first gate 50, one second gate 52 and an inverter 54.
Since the frequency converter 40 of present embodiment than frequency conversion apparatus more than 10 one switch switch module and control first switch 42 and the second switch 49, wherein, the diverter switch module comprises first gate 50 and second gate 52 is come control switch 42,49, so can be applied to frequency inverted intermediate frequency signal or baseband signal simultaneously.In an embodiment, first gate 50 can be one with door, and second gate 52 can be one at least in the input have an anti-phase input one with door.First gate 50 produces one according to a control signal and switches signal, to control first switch 42, when namely the control signal that receives when first gate 50 is the high level signal, expression frequency conversion apparatus 40 is applied to baseband signal, just first gate 50 is switched first input signal and second input signal in regular turn according to the sampling frequency fs of sample signal, confession analog-digital converter 44 is taken a sample and is changed, simultaneously, 49 of second switches are to stop to switch, only be that first digital signal that analog-digital converter 44 produces is sent to after filter 46 carries out filtering and handle, exported; When the control signal is the low level signal, expression frequency conversion apparatus 40 is to be applied to intermediate frequency signal, first switch 42 stops to switch, at this moment, the function mode of frequency conversion apparatus 40 is identical with frequency conversion apparatus 10, therefore, 44 transmission pipelines by above-mentioned first input signal or second input signal of analog-digital converter receive one the 3rd input signal, and produce one the 3rd digital signal in symbol transition circuit 48 and second switch 49, wherein, the 3rd input signal (not shown) is the output signal of a tuner, is an intermediate frequency signal; Symbol transition circuit 48 carries out the sign conversion with the 3rd digital signal, is about to the 3rd digital signal and carries out the negative sign conversion and produce one the 4th digital signal.The same, in another embodiment, symbol transition circuit 48 can be a multiplier, and the 3rd digital signal be multiply by a negative and produces one the 4th digital signal, and is sent to switch 49.In a preferred embodiment, this negative can be-1; In second embodiment, symbol transition circuit 48 can be 1 ' s complement code (1 ' s complement) circuit; In the 3rd embodiment, symbol transition circuit 48 can be 1 ' s complement code (2 ' s complement) circuit.Simultaneously, 49 of second switches are to switch the 3rd digital signal and the 4th digital signal in regular turn according to 1/2nd sampling frequency (fs/2), and are sent to filter 46 carrying out the filtering processing, and produce one the 3rd filtering signal and one the 4th filtering signal respectively.
In sum, frequency conversion apparatus of the present invention is the sampling frequency fs with the analog-digital converter that it was comprised, and meets following equation:
n·f
s±f
if＝fs/4
That is the sampling frequency fs of analog-digital converter is 4 times, 8 times of input signal frequency etc.Thus, so can save the use of oscillator, and by the switching of switch, and the use of minimizing analog-digital converter and filter, relatively reduce the area of circuit, and then save cost, and, frequency converter of the present invention can be applied to the use of baseband signal or intermediate frequency signal simultaneously, further provides cost savings.
The above only is a preferred embodiment of the present invention, be not to limit scope of the invention process, all equalizations of doing according to the described shape of claim of the present invention, structure, feature and spirit change and modify, and all should be included in the scope of claim of the present invention.
Claims (39)
1. frequency conversion apparatus, it comprises:
One analog-digital converter receives and the input signal of taking a sample according to a sampling frequency, to produce one first digital signal, wherein, between the frequency of this sampling frequency and this input signal one corresponding relation is arranged;
One symbol transition circuit in order to receiving this first digital signal, and carries out a symbol transition to it, and produces one second digital signal;
One first switch module, in order to according to this sampling frequency, one of them that select this first digital signal and this second digital signal is as an output signal;
One filter is coupled to this first switch module, in order to filtering this output signal from this first switch module, and produces one first filtering signal and one second filtering signal; And
One second switch module is coupled to this filter, in order to according to this sampling frequency, alternately exports this first filtering signal and this second filtering signal to one first outgoing route or one second outgoing route.
2. frequency conversion apparatus as claimed in claim 1, wherein to be this sampling frequency be 1/4th of the frequency of this input signal to this corresponding relation.
3. frequency conversion apparatus as claimed in claim 1, wherein this symbol transition is the sign conversion of signal.
4. frequency conversion apparatus as claimed in claim 1, wherein this first switch module alternately transmits this first digital signal and this second digital signal according to 1/2nd frequency size of this sampling frequency.
5. frequency conversion apparatus as claimed in claim 1, wherein this symbol transition circuit includes a multiplier, in order to this first digital signal be multiply by a negative, and produces this second digital signal.
6. frequency conversion apparatus as claimed in claim 1, wherein this filter comprises:
One first Postponement module postpones this output signal in regular turn in order to receive also, and produces a plurality of first delay signals;
One second Postponement module in order to receive and to postpone described first one that postpones in the signal in regular turn, postpones signal to produce a plurality of second;
One first addition module, postpone signal and the described second delay signal in order to receive this input signal, described first, and the part that this input signal, described first is postponed to correspond to each other in signal and the described second delay signal gives addition, produces a plurality of first summation signals with correspondence;
One first multiplier module in order to receiving the described first summation signal and a plurality of first coefficient, and is multiplied each other the part that corresponds to each other in the described first summation signal and described first coefficient, produces a plurality of first product signals with correspondence;
One second multiplier module in order to receiving the described first summation signal and a plurality of second coefficient, and is multiplied each other the part that corresponds to each other in the described first summation signal and described second coefficient, produces a plurality of second product signals with correspondence;
One second addition module is in order to receive and to add up the described first product signal respectively, to produce this first filtering signal; And
One the 3rd addition module is in order to receive and to add up the described second product signal respectively, to produce this second filtering signal.
7. frequency conversion apparatus as claimed in claim 6, wherein this filter is a finite impulse response filter.
8. frequency conversion apparatus as claimed in claim 7, wherein this finite impulse response filter is one to have the finite impulse response filter of symmetry coefficient.
9. frequency conversion apparatus as claimed in claim 1, wherein this first outgoing route and this second outgoing route are respectively a homophase I outgoing route or a quadrature Q outgoing route.
10. frequency conversion apparatus as claimed in claim 1, wherein this input signal is an intermediate frequency signal.
11. frequency conversion apparatus as claimed in claim 1, wherein this input signal is an output signal of a tuner.
12. frequency conversion apparatus as claimed in claim 1 also comprises:
One the 3rd switch module, be coupled to this analog-digital converter, switching the control signal according to this sampling frequency and switches between one first input path and one second input path, and receive this input signal, and will be sent to this analog-digital converter by this input signal that this first input path or this second input path receive, wherein, the 3rd switch module also can stop to switch according to this switching controls signal, and only transmits the signal of being received by this first input path; And
One switches control module, in order to produce this switching controls signal in this first switch module and the 3rd switch module, to control the switching of this first switch module and the 3rd switch module.
13. frequency conversion apparatus as claimed in claim 12, wherein when the 3rd switch module is fixing when receiving the signal that transmits in this first input path, then this first switch module alternately transmits this first digital signal and this second digital signal to this filter according to this sampling frequency.
14. frequency conversion apparatus as claimed in claim 12, wherein when the 3rd switch module in switching between this first input path and this second input path when receiving this input signal, then this first switch module stops switching and only transmits this first digital signal.
15. frequency conversion apparatus as claimed in claim 12, wherein this input signal of receiving of the 3rd switch module can be an intermediate frequency signal.
16. frequency conversion apparatus as claimed in claim 14, wherein this input signal of receiving of the 3rd switch module can be an I signal and a Q signal.
17. a frequency conversion method, its step comprises:
One first input path is provided, according to one first sampling frequency, and reception and sampling are from one first input signal in this first input path, to produce one first digital signal, wherein, this first sampling frequency has a corresponding relation with the frequency of this first input signal;
This first digital signal is carried out a symbol transition, and produce one second digital signal;
One at least in this first digital signal of filtering and this second digital signal, and produce one first filtering signal and one second filtering signal; And
Export this first filtering signal and this second filtering signal to one first outgoing route and one second outgoing route respectively.
18. frequency conversion method as claimed in claim 17, wherein to be this first sampling frequency be 1/4th of the frequency of this first input signal to this corresponding relation.
19. frequency conversion method as claimed in claim 17, this step that wherein produces this first filtering signal and this second filtering signal also comprises:
According to one second sampling frequency, be used to switch between this first digital signal and this second digital signal, and replace this first digital signal of filtering and this second digital signal.
20. frequency conversion method as claimed in claim 19, wherein this second sampling frequency is 1/2nd of this first sampling frequency.
21. frequency conversion method as claimed in claim 19, wherein this first input signal is an intermediate frequency signal.
22. frequency conversion method as claimed in claim 17, this step that wherein produces this first digital signal also comprises:
One second input path is provided, switch the control signal according to this first sampling frequency and, in between this first input path and this second input path, switch, and alternately transmit this first input signal and one second input signal that is derived from this second input path, to produce this first digital signal.
23. frequency conversion method as claimed in claim 22, this step that wherein produces this first filtering signal and this second filtering signal also comprises:
This first digital signal of filtering, and produce this first filtering signal and this second filtering signal.
24. frequency conversion method as claimed in claim 22, wherein this first input signal and this second input signal are respectively I signal and Q signal.
25. frequency conversion method as claimed in claim 22, wherein this first input signal and this second input signal are a baseband signal.
26. frequency conversion method as claimed in claim 17, wherein this symbol transition is sign conversion.
27. a frequency conversion apparatus, it comprises:
One first switch module switches between one first input path and one second input path according to a sampling frequency, and receives one first input signal or one second input signal, and transmits this first input signal and this second input signal;
One analog-digital converter receives and take a sample this first input signal or this second input signal according to this sampling frequency, to produce one first digital signal, wherein, between the frequency of this sampling frequency and this input signal one corresponding relation is arranged;
One filter is coupled to this analog-digital converter, in order to receive and filtering from this first digital signal of this analog-digital converter, and produce one first filtering signal and one second filtering signal; And
One second switch module is coupled to this filter, according to this sampling frequency, alternately exports this first filtering signal and this second filtering signal to one first outgoing route and one second outgoing route.
28. frequency conversion apparatus as claimed in claim 27, wherein to be this sampling frequency be 1/4th of the frequency of this first input signal or this second input signal to this corresponding relation.
29. frequency conversion apparatus as claimed in claim 27, wherein this filter comprises:
One first Postponement module postpones this first digital signal in regular turn in order to receive also, and produces a plurality of first delay signals;
One second Postponement module in order to receive and to postpone described first one that postpones in the signal in regular turn, postpones signal to produce a plurality of second;
One first addition module, postpone signal and the described second delay signal in order to receive this first input signal, described first, and the part that this first input signal or this second input signal, described first are postponed to correspond to each other in signal and the described second delay signal gives addition, produces a plurality of first summation signals with correspondence;
One first multiplier module in order to receiving the described first summation signal and a plurality of first coefficient, and is multiplied each other the part that corresponds to each other in the described first summation signal and described first coefficient, produces a plurality of first product signals with correspondence;
One second multiplier module in order to receiving the described first summation signal and a plurality of second coefficient, and is multiplied each other the part that corresponds to each other in the described first summation signal and described second coefficient, produces a plurality of second product signals with correspondence;
One second addition module is in order to receive and to add up the described first product signal respectively, to produce this first filtering signal; And
One the 3rd addition module is in order to receive and to add up the described second product signal respectively, to produce this second filtering signal.
30. frequency conversion apparatus as claimed in claim 29, wherein this filter is a finite impulse response filter.
31. frequency conversion apparatus as claimed in claim 30, wherein this finite impulse response filter is one to have the finite impulse response filter of symmetry coefficient.
32. frequency conversion apparatus as claimed in claim 27, wherein this first outgoing route and this second outgoing route are respectively a homophase I outgoing route or a quadrature Q outgoing route.
33. frequency conversion apparatus as claimed in claim 27, wherein this first input signal and this second input signal are a baseband signal.
34. frequency conversion apparatus as claimed in claim 27, wherein this first input signal and this second input signal are an output signal of a tuner.
35. frequency conversion apparatus as claimed in claim 27, wherein this first input signal and this second input signal are respectively an I signal or a Q signal.
36. a frequency conversion method, its step comprises:
One first input path and one second input path are provided, according to a sampling frequency, import one first input signal and one second input signal that transmit in path and switch and receive this first input path or this second;
According to this sampling frequency, and receive and take a sample this first input signal and this second input signal, to produce one first digital signal, wherein, this sampling frequency and this first input signal have a corresponding relation with the frequency of this second input signal;
This first digital signal of filtering, and produce one first filtering signal and one second filtering signal; And
Export this first filtering signal and this second filtering signal to one first outgoing route and one second outgoing route respectively.
37. frequency conversion method as claimed in claim 36, wherein to be this sampling frequency be 1/4th of the frequency of this first input signal and this second input signal to this corresponding relation.
38. frequency conversion method as claimed in claim 36, wherein this first input signal and this second input signal are a baseband signal.
39. frequency conversion method as claimed in claim 36, wherein this first input signal and this second input signal are respectively I signal and Q signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1430332A (en) * | 2001-12-31 | 2003-07-16 | 瑞昱半导体股份有限公司 | Over-sampling digital analogue converter with variable sampling frequency |
| CN1508981A (en) * | 2002-12-18 | 2004-06-30 | 力原通讯股份有限公司 | Wrieless transmitting device and signal regulating and transmitting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1430332A (en) * | 2001-12-31 | 2003-07-16 | 瑞昱半导体股份有限公司 | Over-sampling digital analogue converter with variable sampling frequency |
| CN1508981A (en) * | 2002-12-18 | 2004-06-30 | 力原通讯股份有限公司 | Wrieless transmitting device and signal regulating and transmitting method thereof |
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