CN101272367B - Datum line drifting correcting devices and methods thereof - Google Patents
Datum line drifting correcting devices and methods thereof Download PDFInfo
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- CN101272367B CN101272367B CN2007100882577A CN200710088257A CN101272367B CN 101272367 B CN101272367 B CN 101272367B CN 2007100882577 A CN2007100882577 A CN 2007100882577A CN 200710088257 A CN200710088257 A CN 200710088257A CN 101272367 B CN101272367 B CN 101272367B
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Abstract
The invention discloses a drift correction device for a datum line and a method thereof, which are used for correcting the drift of the datum line. The correction device comprises a differentiator for differencing a data signal to generate a differential signal, a computation module coupled with the differentiator for calculating the data signal on the basis of the differential signal to generate a computation signal, a capture module coupled with the computation module for determining the first critical value and the second critical value according to the computation module, a comparison module coupled with the capture module for comparing the computation signal respectively based on the first critical value and the second critical value so as to generate the first processing signal and the second processing signal, and a latch module coupled with the comparison module for latching the first processing signal and the second processing signal to generate an output signal. The device and the method of the invention can be used for correcting the datum line drift which is caused by a transmitter/a receiver in a wireless delivery system.
Description
Technical field
The present invention is relevant to a kind of correcting device and method, refers to a kind of datum line drift (baseline wandering) correcting device and method especially.
Background technology
In wireless transmitting system, the problem of the datum line drift (baseline wandering) that receiver end occurred is owing to can cause receiver output error signal, and cause the whole wireless transmitting system can't normal operation, therefore, datum line this kind phenomenon of drifting about is the problem that industry constantly attempt to solve for a long time.
In blue tooth transmission system; usually can use Gaussian Frequency Shift Keying (GFSK) module to carry out modulating signal; because receive the influence of intermediate frequency filtering (RX IF filtering) and demodulator intersymbol interference (demodulator ISI), filter transient response datum line or the drift of transmission receiving terminal local oscillating frequency all can cause the problem of datum line drift to take place.
The mode that in the past solved the datum line drift has following several practice, one of them is reached for utilizing the specific coding mode, utilize as making zero (Return to zero, RZ) coding or Manchester (Manchester) coding, can not comprise direct current component in the data streaming that is transmitted (stream), therefore can improve the problem of datum line drift, but be to use this kind mode will sacrifice spendable fundamental frequency width, and can not solve all problems in the blue tooth transmission system.
Another kind is to utilize the mode of AC coupled to reach as rule, signal is carried out AC coupled (AC coupling) to the next stage circuit, signal will store the direct current position standard of self again, be the phenomenon of removable DC datum line drift whereby, but when signal contains the composition of DC, this kind method can't realize that then the time point that therefore adopts this kind practice to have in the use limits.
Summary of the invention
Therefore, one of purpose of the present invention is to provide a kind of in order to revise the correcting device and the method for the datum line drift that emitting/receiving caused in the wireless transmitting system.
The present invention discloses a kind of datum line drifting correcting devices, is to be used for revising datum line drift (baseline wandering), and correcting device comprises a difference engine, a computing module, an acquisition module, a comparison module and a breech lock module.Difference engine is in order to carry out difference with a data-signal, to produce a differential signal.Computing module is coupled to this difference engine, computing module be in order to according to logarithmic difference signal the number of it is believed that carry out computing, to produce a computing signal.Acquisition module is coupled to computing module, and acquisition module is in order to according to the computing signal, determines one first critical value and one second critical value.Comparison module is coupled to acquisition module, and comparison module is in order to according to first critical value and second critical value computing signal is compared respectively, to produce one first processing signals and one second processing signals.The breech lock module is coupled to comparison module, and the breech lock module is in order to breech lock first processing signals and second processing signals, to produce an output signal.
Datum line drifting correcting devices of the present invention, this acquisition module comprises: one first acquisition module in order to according to this computing signal and this first critical value, produces one first amplifying signal and one first feedback signal; One second acquisition module in order to according to this computing signal and this second critical value, produces one second amplifying signal and one second feedback signal; And a gain amplifier, be coupled to this first acquisition module and this second acquisition module, in order to amplification that this first amplifying signal and second amplifying signal are gained, produce this first feedback signal and this second feedback signal.
Datum line drifting correcting devices of the present invention, this first acquisition module comprises: one first multiplexer, in order to receive this computing signal and this first critical value, to export one first multiplexing signal; First state is kept in module, is coupled to this first multiplexer, in order to first multiplexing signal of exporting according to this first multiplexer, produces this first amplifying signal; And one first computing module, be coupled to the temporary module of this first state and this gain amplifier, in order to receive this first amplifying signal and this first feedback signal, produce this first critical value; Wherein this first multiplexing signal be for this computing signal and this first critical value both one of.
Datum line drifting correcting devices of the present invention, this first acquisition module comprise one first decay counter in addition, are coupled to the temporary module of this first state, in order to count, produce one first count results, and, produce one first clear signal according to one first reset signal.
Datum line drifting correcting devices of the present invention, this first clear signal are in order to remove the data of the temporary module of this first state.
Datum line drifting correcting devices of the present invention, this second acquisition module comprises: one second multiplexer, in order to receive this computing signal and this second critical value, to export one second multiplexing signal; Second state is kept in module, is coupled to this second multiplexer, in order to second multiplexing signal of exporting according to this second multiplexer, produces this second amplifying signal; And one second computing module, be coupled to the temporary module of this second state and this gain amplifier, in order to receive this second amplifying signal and this second feedback signal, produce this second critical value; Wherein this second multiplexing signal be for this computing signal and this second critical value both one of.
Datum line drifting correcting devices of the present invention, this second acquisition module comprise one second decay counter in addition, are coupled to the temporary module of this second state, in order to count, produce one second count results, and, produce one second clear signal according to one second reset signal.
Datum line drifting correcting devices of the present invention, this second clear signal are in order to remove the data of the temporary module of this second state.
Datum line drifting correcting devices of the present invention, other comprises an adjuster (Scaler), is coupled between this acquisition module and this comparison module, is used for adjusting this first critical value and this second critical value that this acquisition module is exported.
Datum line drifting correcting devices of the present invention, this computing module are in order to this differential signal and this data-signal are carried out a subtraction, to produce this computing signal.
The present invention discloses a kind of datum line drift correction method in addition, is to be used for revising datum line drift (baseline wandering), and modification method comprises the following step: steps A, a data-signal is carried out difference, to produce a differential signal; Step B carries out computing according to this differential signal to this data-signal, to produce a computing signal; Step C according to this computing signal, determines one first critical value and one second critical value; Step D compares this computing signal according to this first critical value and this second critical value respectively, to produce one first processing signals and one second processing signals; And step e, this first processing signals of breech lock and this second processing signals are to produce an output signal.
Datum line drift correction method of the present invention, step C comprises: step C1: according to this computing signal and this first critical value, produce one first amplifying signal and one first feedback signal; Step C2:, produce one second amplifying signal and one second feedback signal according to this computing signal and this second critical value; And step C3: this first amplifying signal and second amplifying signal are amplified in gain, produce this first feedback signal and this second feedback signal.
Datum line drift correction method of the present invention, step C1 comprises: step C11: receive this computing signal and this first critical value, to export one first multiplexing signal; Step C12:, produce this first amplifying signal according to first multiplexing signal that this first multiplexer is exported; And step C13: receive this first amplifying signal and this first feedback signal, produce this first critical value; Wherein this first multiplexing signal be for this computing signal and this first critical value both one of.
Datum line drift correction method of the present invention, step C1 comprises in addition: step C14: utilize one first decay counter to count, produce one first count results; Step C15:, produce one first clear signal according to this first count results and one first reset signal; And step C16:, remove this first amplifying signal according to this first clear signal.
Datum line drift correction method of the present invention, step C2 comprises: step C21: receive this computing signal and this second critical value, to export one second multiplexing signal; Step C22:, produce this second amplifying signal according to second multiplexing signal that this second multiplexer is exported; And step C23: receive this second amplifying signal and this second feedback signal, produce this second critical value; Wherein this second multiplexing signal be for this computing signal and this second critical value both one of.
Datum line drift correction method of the present invention, step step C2 comprises in addition: step C24: utilize one second decay counter to count, produce one second count results; And step C25:, produce one second clear signal according to this second count results and one second reset signal.Step C26:, remove this second amplifying signal according to this second clear signal.
Datum line drift correction method of the present invention, other comprises: step F: utilize an adjuster (Scaler) to adjust this first critical value and this second critical value of this acquisition module output.
Datum line drift correction method of the present invention, step B carries out a subtraction according to this differential signal to this data-signal, to produce this computing signal.
Datum line drifting correcting devices of the present invention and method thereof can be in order to revise the datum line drift that emitting/receiving caused in the wireless transmitting system.
Description of drawings
Fig. 1 is the schematic diagram of correcting device of the present invention.
Fig. 2 is the schematic diagram of acquisition module in the correcting device of the present invention.
Fig. 3 is the flow chart of modification method of the present invention.
Fig. 4 is the flow chart of step S24 among modification method Fig. 3 of the present invention.
Fig. 5 is the flow chart of step S242 among modification method Fig. 4 of the present invention.
Fig. 6 is the flow chart of step S244 among modification method Fig. 4 of the present invention.
Embodiment
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended graphic elaborating.
See also Fig. 1, Fig. 1 is the schematic diagram of correcting device of the present invention.As shown in Figure 1, embodiments of the invention disclose a kind of correcting device 10 of datum line drift, be to be used for revising datum line drift (baseline wandering), correcting device 10 comprises a difference engine 12, a computing module 14, an acquisition module 16, a comparison module 18 and a breech lock module 20.Difference engine 12 is in order to carry out difference with a data-signal, to produce a differential signal.Computing module 14 is coupled to this difference engine, computing module 14 be in order to according to logarithmic difference signal the number of it is believed that carry out computing, to produce a computing signal.In an embodiment, computing module is in order to differential signal and data-signal are carried out a subtraction, to produce this computing signal.Acquisition module 16 is coupled to computing module 14, and acquisition module 16 is in order to according to the computing signal, determines one first critical value and one second critical value.Comparison module 18 is coupled to acquisition module 16, and comparison module 18 is in order to according to first critical value and second critical value computing signal is compared respectively, to produce one first processing signals and one second processing signals.Breech lock module 20 is coupled to comparison module 18, and breech lock module 20 is in order to breech lock first processing signals and second processing signals, to produce an output signal.
In an embodiment, correcting device 10 of the present invention can comprise an adjuster (Scaler) 22 in addition, and adjuster 22 is coupled between acquisition module 16 and the comparison module 18, is used for adjusting first critical value and this second critical value of acquisition module 16 outputs.
See also Fig. 1 and Fig. 2, Fig. 2 is the schematic diagram of acquisition module in the correcting device of the present invention.As shown in Figures 1 and 2, the acquisition module 16 of correcting device 10 of the present invention comprises one first acquisition module 30, one second acquisition module 40 and a gain amplifier 50.First acquisition module 30 produces one first amplifying signal and one first feedback signal in order to according to the computing signal and first critical value.Second acquisition module 40 produces one second amplifying signal and one second feedback signal in order to according to the computing signal and second critical value.Gain amplifier 50 is coupled to first acquisition module 30 and second acquisition module 40, in order to amplification that first amplifying signal and second amplifying signal are gained, produces first feedback signal and second feedback signal.
Wherein, first acquisition module 30 includes one first multiplexer 32, the temporary module 34 of one first state and one first computing module 36.First multiplexer 32 is in order to receive the computing signal and first critical value, to export one first multiplexing signal, wherein first multiplexing signal be for this computing signal and first critical value both one of.The temporary module 34 of first state is coupled to first multiplexer 32, in order to first multiplexing signal of being exported according to first multiplexer 32, produces this first amplifying signal.First computing module 36 is coupled to temporary module 34 of first state and gain amplifier 50, in order to receive first amplifying signal and first feedback signal, produces first critical value.
In addition, first acquisition module 30 comprises one first decay counter 38, the first decay counters 38 in addition and is coupled to the temporary module 34 of first states, the first decay counter 38 is in order to count, produce one first count results, and, produce one first clear signal according to one first reset signal.First clear signal can make acquisition module 16 produce first critical value again in order to remove the data of the temporary module 34 of first state.
Wherein second acquisition module 40 comprises one second decay counter 48, the second decay counters 48 in addition and is coupled to the temporary module 44 of second states, in order to count, produces one second count results, and according to one second reset signal, produces one second clear signal.Wherein second clear signal is in order to remove the data of the temporary module of second state.Can make acquisition module 16 produce second critical value again whereby.
In an embodiment, first critical value is in order to judge whether the computing signal reaches crest, second critical value then is to be used for judging whether the computing signal reaches trough, therefore comparison module 18 can utilize first critical value and second critical value and computing signal to compare, whether the waveform of judging the computing signal is higher than first critical value or is lower than second critical value, can judge whether the computing signal reaches crest or trough, the result after then relatively judging by it produces first processing signals and second processing signals.
See also Fig. 3, Fig. 3 is the flow chart of modification method of the present invention.As shown in Figure 3, another embodiment of the present invention discloses a kind of datum line drift correction method, is to be used for revising datum line drift (baseline wandering), and this modification method comprises the following step:
S20 a: data-signal is carried out difference, to produce a differential signal;
S22: according to this differential signal this data-signal is carried out computing, to produce a computing signal;
S24:, determine one first critical value and one second critical value according to this computing signal;
S26: according to this first critical value and this second critical value this computing signal is compared respectively, to produce one first processing signals and one second processing signals; And
S28: this first processing signals of breech lock and this second processing signals, to produce an output signal.
In an embodiment, modification method of the present invention can comprise in addition:
Step S30: utilize first critical value and second critical value that are produced among an adjuster (Scaler) the set-up procedure S24, more adjusted first critical value and second critical value are carried out the processing action of step S26.
See also Fig. 4, Fig. 4 is the flow chart of step S24 among modification method Fig. 3 of the present invention.In present embodiment, step S24 still includes:
S242:, produce one first amplifying signal and one first feedback signal according to this computing signal and this first critical value;
S244:, produce one second amplifying signal and one second feedback signal according to this computing signal and this second critical value; And
S246: this first amplifying signal and second amplifying signal are amplified in gain, produce this first feedback signal and this second feedback signal.
See also Fig. 5, Fig. 5 is the flow chart of step S242 among modification method Fig. 4 of the present invention.Wherein, step S242 comprises in addition:
S60; Receive this computing signal and this first critical value, to export one first multiplexing signal;
S62:, produce this first amplifying signal according to first multiplexing signal that this first multiplexer is exported; And
S64: receive this first amplifying signal and this first feedback signal, produce this first critical value.
In addition, wherein step S242 can comprise in addition:
S66: utilize one first decay counter to count, produce one first count results;
S68:, produce one first clear signal according to this first count results and one first reset signal; And
S69:, remove this first amplifying signal according to this first clear signal.
See also Fig. 6, Fig. 6 is the flow chart of step S244 among modification method Fig. 4 of the present invention.Wherein step S244 comprises:
S70: receive this computing signal and this second critical value, to export one second multiplexing signal;
S72:, produce this second amplifying signal according to second multiplexing signal that this second multiplexer is exported; And
S74: receive this second amplifying signal and this second feedback signal, produce this second critical value.
In addition, step S244 can comprise in addition:
S76: utilize one second decay counter to count, produce one second count results;
S78:, produce one second clear signal according to this second count results and one second reset signal; And
S79:, remove this second amplifying signal according to this second clear signal.
As previously mentioned, correcting device of the present invention and method thereof, in the receiver applicable to wireless transmitting system, reception is via the signal of modulator demodulation, carry out producing after the pre-process such as signal differential and analog digital conversion the data-signal of number format, determine first critical value (crest critical value) and second critical value (trough critical value) of computing signal again by computing module in the correcting device of the present invention and acquisition module, then utilize comparison module, carry out the computing signal and first critical value respectively, the comparison of second critical value, utilize the breech lock module to carry out exporting behind the breech lock again, can eliminate the problem of datum line drift, therefore correcting device of the present invention and method can be drifted about in order to revise the datum line that emitting/receiving caused in the wireless transmitting system.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
10: correcting device
12: difference engine
14: arithmetic element
16: acquisition module
18: comparison module
20: the breech lock module
22: adjuster
30: the first acquisition modules
32: the first multiplexers
34: the first temporary modules of state
36: the first computing modules
38: the first decay counters
40: the second acquisition modules
42: the second multiplexers
44: the second temporary modules of state
46: the second computing modules
48: the second decay counters
50: gain amplifier
S20～S246: step
Claims (18)
1. a datum line drifting correcting devices is characterized in that, is to be used for revising the datum line drift, and this correcting device comprises:
One difference engine is in order to carry out difference with a data-signal, to produce a differential signal;
One computing module is coupled to this difference engine, in order to according to this differential signal this data-signal is carried out computing, to produce a computing signal;
One acquisition module is coupled to this computing module, in order to according to this computing signal, determines one first critical value and one second critical value;
One comparison module is coupled to this acquisition module, in order to according to this first critical value and this second critical value this computing signal is compared, to produce one first processing signals and one second processing signals; And
One breech lock module is coupled to this comparison module, in order to this first processing signals of breech lock and this second processing signals, to produce an output signal.
2. datum line drifting correcting devices according to claim 1 is characterized in that, this acquisition module comprises:
One first acquisition module in order to according to this computing signal and this first critical value, produces one first amplifying signal and one first feedback signal;
One second acquisition module in order to according to this computing signal and this second critical value, produces one second amplifying signal and one second feedback signal; And
One gain amplifier is coupled to this first acquisition module and this second acquisition module, in order to amplification that this first amplifying signal and second amplifying signal are gained, produces this first feedback signal and this second feedback signal.
3. datum line drifting correcting devices according to claim 2 is characterized in that, this first acquisition module comprises:
One first multiplexer is in order to receive this computing signal and this first critical value, to export one first multiplexing signal;
First state is kept in module, is coupled to this first multiplexer, in order to first multiplexing signal of exporting according to this first multiplexer, produces this first amplifying signal; And
One first computing module is coupled to the temporary module of this first state and this gain amplifier, in order to receive this first amplifying signal and this first feedback signal, produces this first critical value;
Wherein this first multiplexing signal be for this computing signal and this first critical value both one of.
4. datum line drifting correcting devices according to claim 3, it is characterized in that, this first acquisition module comprises one first decay counter in addition, be coupled to the temporary module of this first state, in order to count, produce one first count results, and, produce one first clear signal according to one first reset signal.
5. datum line drifting correcting devices according to claim 4 is characterized in that, this first clear signal is in order to remove the data of the temporary module of this first state.
6. datum line drifting correcting devices according to claim 2 is characterized in that, this second acquisition module comprises:
One second multiplexer is in order to receive this computing signal and this second critical value, to export one second multiplexing signal;
Second state is kept in module, is coupled to this second multiplexer, in order to second multiplexing signal of exporting according to this second multiplexer, produces this second amplifying signal; And
One second computing module is coupled to the temporary module of this second state and this gain amplifier, in order to receive this second amplifying signal and this second feedback signal, produces this second critical value;
Wherein this second multiplexing signal be for this computing signal and this second critical value both one of.
7. datum line drifting correcting devices according to claim 6, it is characterized in that, this second acquisition module comprises one second decay counter in addition, be coupled to the temporary module of this second state, week is to count, produce one second count results, and, produce one second clear signal according to one second reset signal.
8. datum line drifting correcting devices according to claim 7 is characterized in that, this second clear signal is in order to remove the data of the temporary module of this second state.
9. datum line drifting correcting devices according to claim 1 is characterized in that other comprises an adjuster, is coupled between this acquisition module and this comparison module, is used for adjusting this first critical value and this second critical value that this acquisition module is exported.
10. datum line drifting correcting devices according to claim 1 is characterized in that, this computing module is in order to this differential signal and this data-signal are carried out a subtraction, to produce this computing signal.
11. a datum line drift correction method is characterized in that, is to be used for revising the datum line drift, this modification method comprises the following step:
Steps A a: data-signal is carried out difference, to produce a differential signal;
Step B: according to this differential signal this data-signal is carried out computing, to produce a computing signal;
Step C:, determine one first critical value and one second critical value according to this computing signal;
Step D: according to this first critical value and this second critical value this computing signal is compared respectively, to produce one first processing signals and one second processing signals; And
Step e: this first processing signals of breech lock and this second processing signals, to produce an output signal.
12. datum line drift correction method according to claim 11 is characterized in that step C comprises:
Step C1:, produce one first amplifying signal and one first feedback signal according to this computing signal and this first critical value;
Step C2:, produce one second amplifying signal and one second feedback signal according to this computing signal and this second critical value; And
Step C3: this first amplifying signal and second amplifying signal are amplified in gain, produce this first feedback signal and this second feedback signal.
13. datum line drift correction method according to claim 12 is characterized in that step C1 comprises:
Step C11: receive this computing signal and this first critical value, to export one first multiplexing signal;
Step C12:, produce this first amplifying signal according to this first multiplexing signal; And
Step C13: receive this first amplifying signal and this first feedback signal, produce this first critical value;
Wherein this first multiplexing signal be for this computing signal and this first critical value both one of.
14. datum line drift correction method according to claim 12 is characterized in that step C1 comprises in addition:
Step C14: utilize one first decay counter to count, produce one first count results;
Step C15:, produce one first clear signal according to this first count results and one first reset signal; And
Step C16:, remove this first amplifying signal according to this first clear signal.
15. datum line drift correction method according to claim 12 is characterized in that step C2 comprises:
Step C21: receive this computing signal and this second critical value, to export one second multiplexing signal;
Step C22:, produce this second amplifying signal according to this second multiplexing signal; And
Step C23: receive this second amplifying signal and this second feedback signal, produce this second critical value;
Wherein this second multiplexing signal be for this computing signal and this second critical value both one of.
16. datum line drift correction method according to claim 12 is characterized in that, step step C2 comprises in addition:
Step C24: utilize one second decay counter to count, produce one second count results; And
Step C25:, produce one second clear signal according to this second count results and one second reset signal;
Step C26:, remove this second amplifying signal according to this second clear signal.
17. datum line drift correction method according to claim 11 is characterized in that other comprises:
Step F: utilize an adjuster to adjust this first critical value and this second critical value.
18. datum line drift correction method according to claim 11 is characterized in that step B carries out a subtraction according to this differential signal to this data-signal, to produce this computing signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1366385A (en) * | 2002-02-05 | 2002-08-28 | 威盛电子股份有限公司 | Receiver with adaptive qualizer and base line drift compensator |
| CN1433160A (en) * | 2002-01-18 | 2003-07-30 | 威盛电子股份有限公司 | Method of compensating drift of transmission signal reference line and relevant circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1433160A (en) * | 2002-01-18 | 2003-07-30 | 威盛电子股份有限公司 | Method of compensating drift of transmission signal reference line and relevant circuit |
| CN1366385A (en) * | 2002-02-05 | 2002-08-28 | 威盛电子股份有限公司 | Receiver with adaptive qualizer and base line drift compensator |
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