CN101882918B - Automatic gain control method and device - Google Patents
Automatic gain control method and device Download PDFInfo
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- CN101882918B CN101882918B CN200910137113.5A CN200910137113A CN101882918B CN 101882918 B CN101882918 B CN 101882918B CN 200910137113 A CN200910137113 A CN 200910137113A CN 101882918 B CN101882918 B CN 101882918B
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Abstract
The invention discloses an automatic gain control method and an automatic gain control device, which are used for controlling a gain value of a received signal. The method comprises the following step of: at the same time of regulating and converging the gain value, entering a searching mode to additionally change the gain value at least once to make the gain value approximate to a target level according to at least one characteristic value of relation indicating the change of the gain value with time. In another embodiment, the method further comprises the step of: entering a tracking mode to make the regulation period of gain longer than that before in a periodical gain regulation way so as to reduce introduced noise energy in the tracking of signal strength. Therefore, the embodiment of the invention can improve gain convergence speed, further reduce the influence of noises to a communication system in a mobile receiving environment and improve signal receiving efficiency.
Description
Technical field
The present invention relates to receive processing method and the signal receiving device of signal.
Background technology
Communication system general reference application signal strength signal intensity or its derivative numerical value carry out the system of demodulation coding, comprise wired and wireless telecommunication system, broadcast and access communication system.In general communication system, under different channels, signal strength signal intensity is subject to the properties influence of channel and rises and falls, if the intensity of the reception signal of receiving terminal sees through the automatic gain controller adjustment, can make to receive signal and maintain in the constant intensity scope, in order to avoid the receiving terminal erroneous judgement receives the message of signal.
Yet, in real system, the signal strength signal intensity after the automatic gain controller adjustment not immobilizes as perfection as above-mentioned hypothesis.Below with Gaussian channel environment explanation automatic gain device in Gaussian channel and fixing operation principles in the multi-path channel environment.Under the Gaussian channel environment, automatic gain controller is adjusted the loop gain size, and between the gain degree of jitter, weighs under gain convergence rate and stable state.When loop gain is large, converge to desirable level speed fast, but shake up and down the acutely gain curve 100 as shown in after time point t1 in Fig. 1 in desirable level, in desirable level 10, shake up and down.When loop gain hour, if switching point is not good, it is slow that gain converges to desirable level speed, but shake up and down mitigation as shown in the dotted line 110 or 120 of the expression change in gain of Fig. 1 in desirable level.
Therefore system designer is put forward the method for various adjustment gains to improve the situation of gain shake under gain convergence rate and stable state.For example the United States Patent (USP) numbering 7336743, and the method characteristic of proposition is the algorithm of gain adjustment control signal generator.The method is divided into coarse adjustment and two stages of fine tuning, and utilizes application step-by-step system adjustment gain in the coarse adjustment stage, improves the gain convergence rate.The coarse adjustment method is to compare the device result according to signal strength signal intensity to determine that the direction of adjusting is increase, minimizing, or remains unchanged, and the gain size that increases at every turn or reduce is to preset fixed value.For example United States Patent (USP) numbers 7295073 again, and its method characteristic proposed is basis signal peak swing adjustment gain, makes the signal of sampling in the analog-digital converter scope that maximum service efficiency be arranged.The method integrated signal intensity estimates that relatively function is in amplitude level detector with signal strength signal intensity, and the output detections result is to range detector.Range detector determines that according to amplitude level detector result the direction of adjusting is for increasing, reducing, or remains unchanged, and the gain size that increases at every turn or reduce is default fixed value.
But under the movable passageway environment, automatic gain controller is stablized in the process of trace signals Strength Changes compensating for path loss immediately, constantly adjust signal strength signal intensity in symbol in cycle time, cause introducing the receiving efficiency of the extra deteriorated receiver of jittering noise.For example, existing automatic gain controller, as United States Patent (USP) numbering 7336743,7295073,7031409 and 6574292 patent was proposed all with the adjustment of system works frequency period formula, gains, in mobile environment, introduce the receiving efficiency of the extra deteriorated receiver of jittering noise, therefore it is subject to nonlinear noise and the mobile channel impact is also large.
Generally speaking, existing automatic gain controller, in order to improve the gain convergence rate, can't effectively be taken into account the problem that can introduce noise when following the trail of path loss variation, makes in mobile environment, greatly affects its receiving efficiency.
Summary of the invention
The present invention is a kind of auto gain control method and device, can be applied to different reception environments, the usefulness received to improve signal.In the environment of fixed reception or mobile reception, when yield value is adjusted with convergence, searching modes determines at least one switching value and changes in addition according to this this yield value to shorten the gain convergence time.Moreover in other embodiments, after searching modes, the tracking pattern is to adjust gain mode with periodic, introduces noise energy while reducing trace signals intensity, in the mobile reception environment.So, embodiments of the invention, can improve the gain convergence rate; In addition, under high-speed mobile environment, other embodiments of the invention can also reduce the impact of noise on system.So, under different reception environments, embodiments of the invention all can improve receiver usefulness.
According to a first aspect of the invention, a kind of auto gain control method is proposed, the method comprises: in a searching modes, one yield value of one reception signal is gained when adjusting, situation of change according to a gain curve of yield value, change in addition yield value at least one times so that yield value tends to a target gain level, wherein, the step that changes in addition yield value comprises: at least one characteristic point that detects gain curve; At least one characteristic point according to detecting, determine a switching value, and switching value is with so that yield value approaches the target gain level; And, according to switching value, set yield value and be a new gain value and make it to come into force; Wherein, the step of above-mentioned detection, decision and setting at least is performed once.
In other embodiment of foundation said method, also comprise: after the step of setting yield value is performed for the last time, enter a tracking pattern, in the tracking pattern, periodically judge whether to adjust yield value, wherein, yield value controlled cycle in the tracking pattern is greater than the cycle that yield value is gained and adjusts in searching modes.
According to a second aspect of the invention, propose a kind of automatic gain control equipment, this device comprises: a variable gain amplifying unit, an analog-digital converter, a detecting unit and a control unit.The variable gain amplifying unit, receive signal to produce a first signal in order to control one according to a yield value.Analog-digital converter, produce a digital signal in order to the foundation first signal.Detecting unit, in order to foundation digital signal and a target level signal, produce a gain signal.Control unit, produce a gain control signal in order to the foundation gain signal, and wherein, the yield value of variable gain amplifier is to adjust according to gain control signal.When control unit operates in a searching modes, control unit is when yield value gains adjustment, and at least one characteristic value that is according to the time dependent pass of yield value, change yield value at least one times in addition so that yield value tends to a target gain level.
According to a third aspect of the invention we, propose a kind of automatic gain control equipment, this device comprises: a variable gain amplifying unit, an analog-digital converter and a control unit.The variable gain amplifying unit, receive signal to produce a first signal in order to control one according to a yield value.Analog-digital converter, produce a digital signal in order to the foundation first signal.Control unit, produce a gain control signal in order to foundation digital signal and a target level, and wherein, the yield value of variable gain amplifier is to adjust according to gain control signal.When control unit operates in a searching modes, control unit is when yield value gains adjustment, and at least one characteristic value that is according to the time dependent pass of yield value, change yield value at least one times in addition so that yield value tends to a target gain level.
According to a forth aspect of the invention, propose a kind of automatic gain control equipment, automatic gain control equipment comprises: a variable gain amplifying unit, an analog-digital converter, a power discriminator and a control unit.The variable gain amplifying unit receives signal to produce a first signal in order to control one according to a yield value.Analog-digital converter produces a digital signal in order to the foundation first signal.The power discriminator, in order to foundation digital signal and a target level signal, produce a comparison signal.Control unit produces a gain control signal in order to the foundation comparison signal, and wherein, the yield value of variable gain amplifier is adjusted according to gain control signal.When control unit operates in a searching modes, control unit is when yield value gains adjustment, and at least one characteristic value that is according to the time dependent pass of yield value, change yield value at least one times in addition so that yield value tends to a target gain level.
In other embodiment of the device of foundation the invention described above, after the last yield value of setting in addition comes into force, enter or optionally enter a tracking pattern, in the tracking pattern, control unit periodically judges whether to adjust yield value, wherein, yield value controlled cycle in the tracking pattern is greater than the cycle that yield value is gained and adjusts in searching modes.
For foregoing of the present invention can be become apparent, special embodiment below, and coordinate appended graphicly, be described in detail below:
The accompanying drawing explanation
Fig. 1 illustrates the gain convergence curve of different circuit gain under Gaussian channel;
Fig. 2 illustrates the gain convergence curve of different circuit gain under movable passageway;
Fig. 3 A, Fig. 3 B and Fig. 3 C illustrate the schematic diagram of an embodiment who is applied to the mobile reception environment of auto gain control method of the present invention;
Fig. 3 D illustrates the schematic diagram of an embodiment who is applied to the fixed reception environment of auto gain control method of the present invention;
Fig. 4 A illustrates the flow chart that auto gain control method of the present invention is applied to an embodiment of fixed reception environment;
Fig. 4 B illustrates the flow chart that auto gain control method of the present invention is applied to an embodiment of mobile reception environment;
Fig. 4 C illustrates the flow chart that auto gain control method of the present invention is selectively used for an embodiment of fixed reception or mobile reception environment;
Fig. 4 D illustrates the flow chart of an embodiment of the tracking pattern of auto gain control method of the present invention;
Fig. 5 A and Fig. 5 B illustrate in the searching modes of auto gain control method of the present invention, using local maximum and minimum value during as the characteristic value of change in gain, the schematic diagram of the embodiment of its deciding means;
Fig. 6 illustrates in the searching modes of auto gain control method of the present invention, usings the point of inflexion during as the characteristic value of change in gain, the schematic diagram of the embodiment of its deciding means;
Fig. 7 A illustrates the schematic diagram of gain delta transfer function indicatrix parameter-definition;
Fig. 7 B and Fig. 7 C illustrate the example of gain delta transfer function indicatrix parameter-definition;
Fig. 8 A illustrates the calcspar of an embodiment of automatic gain control equipment of the present invention;
Fig. 8 B illustrates the calcspar of another embodiment of automatic gain control equipment of the present invention;
Fig. 9 A illustrates in the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one first execution mode of control unit;
Fig. 9 B illustrates in the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one second execution mode of control unit;
Fig. 9 C illustrates in the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one the 3rd execution mode of control unit;
Fig. 9 D illustrates in the embodiment of automatic gain control equipment of the present invention of Fig. 8, the calcspar of one the 4th execution mode of control unit;
Figure 10 illustrates the calcspar of another embodiment of automatic gain control equipment of the present invention;
Figure 11 A and Figure 11 B illustrate gain curve figure and see through with signal the example that the measurement mode is calculated the switching point of searching modes;
Figure 12 illustrates the calcspar of another embodiment of automatic gain control equipment of the present invention.
[main element symbol description]
10,301,501,1101: the perfect Gain level
100,110,120,230,250,300,500,1100,1120: gain curve
200: intensity curves under path loss and Doppler effect
201-204: the trough of intensity curves
210: path loss
231-234: the crest of gain curve
240: the path loss compensation
311,312: gain is switched time point a little
510: the single order differential of gain curve
520: the second-order differential of gain curve
710,720: the gain delta transformation curve
800A, 800B, 1000,1200: automatic gain control equipment
810: the variable gain amplifying unit
820: analog-digital converter
830: detecting unit
831: power detector
833: comparator
835,1230: loop filter
840A, 840B, 900A, 900B, 900C, 900D, 1010,1220: control unit
910,1290: controller
930,930A, 930B: switching value determining means
931: the ranking operation device
933: maximum detection unit
935: the minimum value detecting unit
936: the second-order differential device
938: switching value retrieval control unit
939: buffer
940A, 940B, 1270: gain tracing unit
950A, 950B: tracking value generator
951a, 951b: function generating circuit
952: arithmetic element
953: adder
955: subtracter
957: multiplexer
959: latch unit
961: the periodic pulses generator
970: the gain storage element
1110,1130: the difference of maximum and the perfect Gain level
1115,1135: the difference of minimum value and the perfect Gain level
1210: the power discriminator
1250: the gain detecting unit
Embodiment
The different embodiment of auto gain control method of the present invention, propose respectively searching modes, tracking pattern with and combination, to improve the gain convergence rate under various reception environments.In addition, auto gain control method of the present invention is applied to the embodiment of mobile reception environment, promotes under the mobile reception environment when path loss compensates and can reduce the impact of noise on system.So the signal receiving efficiency is improved.
In communication system, the gain curve of the yield value of automatic gain controller is in convergence process, yield value is controlled by a kind of automatic gain control mode and is adjusted, gain curve 100 as shown in Figure 1, roughly can take desirable level 10 as in up and down the concussion characteristic.One embodiment of the inventive method, in the gain convergence, enter a searching modes, at least one characteristic value over time according to yield value, for example local maximum and minimum value, change in addition yield value at least one times so that yield value tends to a target gain level, wherein, need to be by previous yield value, finding out at least one characteristic value to calculate the size of a switching value with the yield value that determines to change in addition.If with the idea of gain curve, be a switching point that determines gain curve, will gain and switch in fact the target gain level, namely, near target gain level or its, to shorten fast gain, restrain required time.In Fig. 3 A, gain curve 300 after time point 311, be switched to approach gain level 301 under numerical value.Moreover, in another example, also can follow similar manner and find next switching point, more to approach desirable level, as shown in Figure 3 B, after time point 311, gain curve 300 is switched on gain level 301, and continues to follow original automatic gain control mode of carrying out to change and tend to convergence, after the maximum and minimum value through once local, find another suitable switching point, when time point 312, be switched to the numerical value that approaches gain level 301.
After the switching through at least one times action, an embodiment of the inventive method enters another pattern, is called the tracking pattern, the gain curve 300 after the time point 312 of the gain curve 300 of the variation of gain curve 300 after as the time point 311 of Fig. 3 A or Fig. 3 B.Please refer in Fig. 3 C, it is in the tracking pattern of Fig. 3 B, the schematic diagram of gain curve after magnification ratio, and the dotted line of the longitudinal axis wherein represents the update cycle, how also gain curve 300 is periodically determined new numerical value.
In order more to understand the effect of following the trail of pattern in the above embodiment of the present invention, below with mobile channel environment lower channel, changing situation is example, illustrate under gain convergence rate and stable state and must make measurement between the gain degree of jitter, make automatic gain control equipment promote the path loss compensation under the mobile channel environment and reduce the impact of noise on system simultaneously.
In the mobile channel environment, received signal strength can be subject to the double influence 200 of path loss 210 and Doppler effect simultaneously, and signal strength signal intensity is subject to Doppler effect its trough 201,202,203 and 204 as shown in Fig. 2 intensity curves 200.Expect that desirable automatic gain controller can compensate and can ignore Doppler effect again because of the signal strength signal intensity of path loss simultaneously.In Fig. 2, oblique line 240 is depicted as the perfect Gain curve of response path loss, when the large gain curve of loop gain as 230, the path loss compensation speed is fast, gain easily is subject to the Doppler effect impact, and shake is its crest 231,232,233 and 234 as shown in Fig. 2 gain curve 230 comparatively acutely.The inventor observes, if loop gain is little, the path loss compensation speed is slow, and gain is not vulnerable to the Doppler effect impact, and shake comparatively relaxes as shown in the gain curve 250 of Fig. 2 dotted line.
So, referring again to Fig. 3 A and Fig. 3 B, in searching modes, yield value is to carry out original automatic gain control according to the less cycle (i.e. higher frequency of operation), make gain curve continue to produce the situation of change risen and fallen, in comparison, update cycle in the tracking pattern is extended (that is adopting lower frequency of operation) and is introduced jittering noise to reduce, and is aided with the adjustment mode that significantly gains and compensates the tracking path loss ability reduced because of the prolongation update cycle.So, the tracking pattern is useful among the mobile reception environment, and gain is not vulnerable to Doppler effect impact, and shake comparatively relaxes, and can promote the path loss compensation and reduce the impact of noise on signal simultaneously.
In addition, for the fixed reception environment, an embodiment of auto gain control method of the present invention allows the yield value adjustment restrain according to original automatic gain control mode of carrying out after searching modes finishes.As shown in Figure 3 D, in searching modes, twice switching of gain curve 300 experience, additionally set yield value twice in time point 311 and 312.After time point 312 has been done last switching, the more approaching gain level 301 of the variation of gain curve 300, and continue to follow original automatic gain control mode trend convergence of carrying out.As shown in Figure 3 D, gain curve 300 is changed into the yield value that approaches gain level 301 after time point 312.
Moreover other embodiment of auto gain control method of the present invention, comprise searching modes, and optionally according to reception environment and actual situation, for example whether at a high speed or low speed mobile environment, and determines whether further to carry out the tracking pattern.
Please refer to Fig. 4 A, it illustrates the flow chart according to an embodiment of auto gain control method of the present invention.This embodiment illustrates the step of above-mentioned searching modes, can be applicable in the automatic gain control unit of a receiving terminal for example, to control a yield value of a reception signal, to accelerate the speed of gain convergence.In Fig. 4 A, step S410 and S420 mean: be subject to automatic gain at yield value and control and controlled while, detect at least one characteristic value of the time dependent relation of yield value, for example at least one local maximum of yield value and at least one local minimum.In step S410, local maximum or minimum value when the searching yield value is adjusted, if after finding one of them, in step S420, judge whether to find at least one local maximum and at least one local minimum, if not, continue execution step S410, until find at least one local maximum and at least one local minimum.Step S430, according to the characteristic value detected, as at least one local maximum and at least one local minimum, determine a switching value and set according to this yield value, by gain value settings, is for example switching value or other numerical value based on the switching value gained.As shown in step S435, after setting yield value, must wait for a period of time at every turn, with the numerical value of guaranteeing switching point, come into force.As shown in step S440, step S410 to S430 can carry out one or many.If no longer design is calculated switching value to set yield value, after can setting yield value the last time, finish searching modes.The above embodiments are applicable to the fixed reception environment, and result is controlled in the gain that can obtain as shown in Figure 3 D.
In addition, Fig. 4 B illustrates the flow chart according to another embodiment of auto gain control method of the present invention.In this embodiment, the searching modes of square S400 representative as shown in the flow chart of Fig. 4 A, after searching modes, enter a tracking pattern.This embodiment is applicable to the mobile reception environment, and result is controlled in the gain that can obtain as shown in Fig. 3 A or Fig. 3 B.Square S460, in the tracking pattern, periodically adjust the size of yield value or remain unchanged with decision according to the comparative result of the intensity estimated value that receives signal and preset signals intensity.Yield value controlled cycle in the tracking pattern is greater than the cycle of the system frequency of communication system.Also furtherly, yield value controlled cycle in the tracking pattern is greater than yield value controlled cycle of yield value when not entering the tracking pattern.For example, under the application mobile environment or under wired communication environment, as applied orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing, OFDM) communication system, above-mentioned yield value controlled cycle in the tracking pattern is greater than the time span of symbol.
In addition, Fig. 4 C illustrates the flow chart according to another embodiment of auto gain control method of the present invention.Different being of embodiment at this embodiment from Fig. 4 B, after searching modes, through step 450, judge whether to enter the tracking pattern.If the beginning is carried out the tracking pattern of square S460 representative; If not, carry out other control or end.The effect of step 450 herein is for reaching optimization, and make the embodiment of the method can be applicable to different reception environments, the communication system of carrying out this embodiment can be judged whether to enter the tracking pattern in step S450 according to demand or actual conditions, or sets parameter wherein.And the criterion of judgement, for example: whether current reception signal derives from mobile environment; Or mobile environment whether at a high speed (as vehicle of the bullet train travelled or highway); Or whether the signal strength signal intensity that receives signal reaches a threshold value.So, according to this embodiment, can reach in response to different situations the optimization effect that automatic gain is controlled.
Then, in above-described embodiment, the different execution modes of the step of searching modes and the pattern of tracking are described as follows.
In Fig. 4 A, step S410 and S420 mean: be subject to automatic gain at yield value and control and controlled while, detect at least one characteristic value of the time dependent relation of yield value.Characteristic value is at least one local maximum and at least one local minimum of aforesaid gain curve for example, characteristic value can also represent for other numerical value of yield value variation characteristic in addition, for example, yield value when corresponding to the point of inflexion on gain curve or yield value and changing second-order differential to the time and be zero.Below with the example of enumerating several characteristic value definition, illustrate.
At first take local maximum and minimum value is example as the characteristic value of change in gain.Fig. 5 A is shown in the searching modes of auto gain control method of the present invention, and a yield value is according to the situation of time dependent relation, and wherein transverse axis represents the time, and the longitudinal axis represents the numerical value of yield value.Be shown in a plurality of yield values obtained in a time interval in Fig. 5 A, can be considered as in fact a gain curve 500 through sampling and a plurality of yield values, and straight line 501 represents the gain level of target, wherein, the corresponding yield value of time point n is called y[n].
First case is in a time interval, compares a plurality of yield values of the time dependent relation of yield value, to determine local maximum and minimum value.For example, between the time point 7 to 11 of Fig. 5 A, yield value has following relation to occur: y[7]<y[8]<y[9]>y[10]>y[11], yield value y[9] can be considered a local maximum.In addition, between time point 17 to 21, yield value has following relation to occur: y[17]>y[18]>y[19]<y[20]<y[21], yield value y[19] can be considered a local minimum.The gain curve sampling frequency can be more than or equal to the digital quantizer sampling frequency.
Second case is at first in a time interval, and the single order differential of finding change in gain is essentially zero the corresponding yield value of time point, and this yield value can be considered in fact the stationary point (stationary point) of gain curve 500.Then, utilize gain values magnitude relationship corresponding to these stationary points to determine that the yield value of the gained of previous step is local maximum or minimum value.The single order differential of the gain curve 500 of the curve 510 schematic diagram 5A of Fig. 5 B for example, find at least one group of the time point that gain single order differential is zero, and example time point as shown in Figure 5 B is respectively: t
1, t
2, t
3, t
4.According to t
1, t
2, t
3, t
4, the yield value that corresponds to gain curve is respectively: y[t
1], y[t
2], y[t
3], y[t
4], and the numerical relation of these yield values of comparison.Due to y[t
1]>y[t
2], y[t
2]<y[t
3], y[t
3]>y[t
4], can judge y[t
1] and y[t
3] (equal approximately respectively y[9], y[29]) be local maximum, y[t
2] and y[t
4] (equal approximately respectively y[19], y[39]) be local minimum.
The 3rd example is to apply the way of second case, different, further obtains the second-order differential of gain curve 500, and utilizes the time point t that the single order differential is zero
1, t
2, t
3, t
4, according to the numerical value of corresponding second-order differential, whether be plus or minus, judge whether the corresponding yield value of these time points is local minimum or maximum.Due to this basic application that is the calculus principle, therefore do not repeat them here.
Except usining local maximum and the minimum value characteristic value as change in gain, the corresponding yield value of time point when the second-order differential that the characteristic value of change in gain may be defined as change in gain is zero.If with the viewpoint of gain curve, this characteristic value corresponds to the point of inflexion (inflection point) of gain curve 500.Please refer to Fig. 6, the variation relation of the second-order differential of the gain curve 500 in curve 520 schematic diagram 5A.Find the time point that the gain second-order differential is 0, more at least, the time point in Fig. 6: t ' for example
1, t '
2, t '
3, t '
4, according to t '
1, t '
2, t '
3, t '
4-, the yield value that corresponds to gain curve 500 is designated as respectively y[t '
1], y[t '
2], y[t '
3], y[t '
4].Because these yield values can be considered in fact the target gain level, so, as long as at least obtain an above-mentioned yield value, as y[t '
1], can be set as new yield value for step S 430.
In step S430, switching value is to obtain according at least one characteristic value, different execution modes can be arranged according to the definition of characteristic value, its purpose is to find out a switching value and can determines according to this how to set current yield value in variation to make it to be switched to a new yield value, to approach the target gain level.For example, characteristic value is that to take at least one local maximum and at least one local minimum be definition, but the summation of the weighting of these local maximums and minimum value can be tried to achieve a switching value, as mean value.In addition, the yield value (can be considered the point of inflexion of gain curve) that if characteristic value is defined as the second-order differential of the time dependent relation of gain while being zero, except can directly setting this increment for switching value, other algorithm of also can arranging in pairs or groups, for example calculate the mean value of a plurality of yield values that correspond to the point of inflexion as switching value, and set according to this yield value, to increase accuracy.In addition, switching point also can according to the element characteristic of the automatic gain control unit in receiving terminal, local maximum and minimum value decide in addition.Element characteristic for example refers to the input signal power of a variable gain amplifier, the relation of the relation of output signal power and gain and input signal and gain.
Generally speaking, in searching modes, detect at least step of one or more characteristic value, be to estimate the kenel that current yield value changes, and then set yield value according to this in step S430.So any characteristic value that can reflect substantially this change in gain kenel, can be in order to implementation step S410 and S420.The gain control signal of variable gain amplifying unit for example, its change to yield value is relevant, so, detect at least one characteristic value of this gain control signal, also can be considered the embodiment of the equalization of step S410 and S420.
While stating on the implementation the method for embodiment, the step that comprises step S410 to S430 if only carry out in searching modes once after, enter the tracking pattern, but omit step S440.In addition, in other embodiments, as shown in Figure 3 B, but the variation of duplicate detection gain curve and calculating switching value position are at least one times, and the switching point numerical value that makes to gain progressively approaches desirable level.In addition, during the numerical value that is switching point at each setting yield value, must wait for a period of time, come into force with the numerical value of guaranteeing switching point, as shown in step S435.In addition, the time of this wait can be set a reasonable time by the element characteristic of the automatic gain control unit in receiving terminal when implementing, TUA 6034 tuners of company of Infineon (Infineon) for example, and the stand-by period can be set as 110ms.
At the step S460 shown in Fig. 4 B and Fig. 4 C, after entering the tracking pattern, the comparative result of periodic test received signal strength estimated value and preset signals intensity, determine that the direction of adjusting is for increasing amplitude A, reducing amplitude A, or remain unchanged.For example, A is the gain delta transfer function, is the function A () of signal strength signal intensity comparison device Output rusults.If the gain delta transfer function as shown in Figure 7 A, the embodiment of step S460 is as shown in the flow chart of Fig. 4 D.Step S510 and S520, be a cycle in order to maintain gain, if when the time maintained arrives a cycle, as shown in step S530, checks the relation of comparative result Err and a threshold value THD.If the absolute value of comparative result Err is not more than threshold value THD, yield value remains unchanged, and gain delta is 0, therefore method is got back to execution step S510.If the absolute value of comparative result Err is greater than the intensity estimated value of threshold value THD and reception signal and is greater than preset signals intensity,, as shown in step S533, reduce yield value, gain delta is negative value-A.If the intensity estimated value that the absolute value of the large Err of comparative result is greater than threshold value THD and receives signal is less than preset signals intensity,, as shown in step S535, increase yield value, gain delta is on the occasion of+A.As for gain delta+A or-variation pattern of A determines with gain delta transfer function A (), as Fig. 7 A, comparative result Err between threshold value THD and another threshold value XLIMIT the time, gain delta A is SLOPE* (Err-THD), wherein SLOPE means the slope of line segment; When comparative result Err is greater than XLIMIT, gain delta A is a numerical value YLIMIT.
So, can application parameter THD, SLOPE, XLIMIT and YLIMIT defined a gain delta transfer function indicatrix.Other two examples that Fig. 7 B and Fig. 7 C are the gain delta transfer function, gain delta transformation curve 710 and 720, they each own different threshold value T1 and T2.When comparative result is greater than threshold value, each own different variation of gain delta+A.For gain delta transformation curve 710, when comparative result is greater than T1, gain delta+A is fixing numerical value YLIMIT.For gain delta transformation curve 720, when comparative result is greater than T2, gain delta+A is can be different with the change of comparative result.Thus, in step S460, can descend low noise to the impact of system with high-speed mobile, to select suitable update cycle and gain delta transfer function, to reduce jittering noise and compensatory tracking path loss ability.
Below disclose several embodiment according to an automatic gain control equipment of the present invention, wherein, these embodiment can be in order to carry out the embodiment of above-mentioned auto gain control method.
Please refer to an embodiment of the photograph automatic gain control equipment of the present invention of Fig. 8 A, be used in a communication system control a yield value of a reception signal, so that the signal after gain closes the requirement of the signal strength signal intensity of symbol communication system.Automatic gain control equipment 800 comprises a variable gain amplifying unit 810, an analog-digital converter 820, a detecting unit 830 and a control unit 840A.Variable gain amplifying unit 810, amplify and receive signal Si to produce a first signal So in order to the yield value according to an analog gain control signal Cga representative.Analog-digital converter 820, produce digital signal Sd in order to foundation first signal So.Detecting unit 830, in order to foundation digital signal Sd and a target level signal T, produce a gain signal Sg and a comparison signal Sc.Control unit 840A, produce above-mentioned analog gain control signal Cga in order to foundation gain signal Sg, and wherein, it is to adjust according to analog gain control signal Cga that variable gain amplifier 810 amplifies the yield value that receives signal Si.
When control unit 840A operates in a searching modes, after at least one characteristic value that control unit 840A in the time dependent pass of the numerical value that gain signal Sg detected is, determine a switching value according to this at least one characteristic value, and set analog gain control signal Cga, with representative, yield value is switched to a new yield value, this yield value can calculate for switching value or according to switching value the numerical value obtained.
The embodiment of above automatic gain control equipment can carry out the embodiment of above-mentioned auto gain control method, is particularly useful in the fixed reception environment.But variable gain amplifying unit 810 for example comprises a variable gain amplifier or gain-programmed amplifier.Control unit 840A is for example but that the programmable circuit is as a microprocessor, microcontroller, digital signal processor, field domain programmed logic gate array or other logical circuit.In searching modes, control unit 840A for example can be by sequencing to implement the method in Fig. 4 A, or the hardware circuit mode is to implement.In addition, in searching modes, when control unit 840A is initial, according to gain signal Sg, determine analog gain control signal Cga; When yield value carries out this gain adjustment, control unit 840A detects at least one characteristic value of the numerical value change of gain signal Sg, after this at least one characteristic value being detected, control unit 840A determines switching value according to this at least one characteristic value in addition, to determine analog gain control signal Cga.
When implementing, also can make control unit 840A set two or more switching values.When control unit 840A sets last switching value, do not change analog gain control signal Cga until after the numerical value of switching point comes into force, control unit 840A is the source as decision analog gain control signal Cga according to gain signal Sg again, as the situation of yield value variation between the time point 311 to 312 of Fig. 3 D; As control unit 840A again at least one characteristic value of the numerical value change that gain signal Sg detected, for example, after being local maximum and local minimum, control unit 840A determines analog gain control signal Cga according to the switching value that this time determined, as shown in the time point 312 in Fig. 3 D, so that yield value more approaches a target gain level of target level signal T representative, as to using the difference of the corresponding comparison signal representative of the more last switching point of difference of comparison signal representative be the little condition as choosing next switching point.In addition, switching value also as above-mentioned be according at least one characteristic value, or its weighted sum or mean value calculate.Moreover, the element characteristic of variable gain amplifying unit 810, as the pass of input/output signal power and gain is and the relation of input signal and gain, can reflect trend and the speed of gain convergence, therefore can when design, consider that it be to determine suitable weight or the ratio of calculating that said elements closes.
Please refer to Fig. 9 A and Fig. 9 B, control unit 900A and 900B implement respectively the circuit block diagram of the embodiment of the control unit 840A in Fig. 8 A.In Fig. 9 A, control unit 900A gain acceptance in signal Sg, and produce according to this analog gain control signal Cga.Control unit 900A comprises a controller 910, a switching value determining means 930A, gain storage element 970 and a digital analog converter 990.
The digital gain control signal Cgd that switching value determining means 930A gain acceptance in storage element 970 is exported, and detect according to this local maximum and the minimum value of change in gain, calculate switching value to produce gain switching signal Sf.
Switching value determining means 930A in Fig. 9 A detects at least one local maximum and at least one local minimum as characteristic value.Switching value determining means 930A comprises a maximum detection unit 933, minimum value detecting unit 935 and a ranking operation device 931, in order to produce gain switching signal Sf.This example can be in order to implement as shown in Figure 5A, and the comparison between the above-mentioned numerical value that utilizes an a plurality of yield values time interval in or equalization decides local maximum and minimum value.For example, digital gain control signal Cgd can be considered as in fact the variation of yield value, maximum detection unit 933 and minimum value detecting unit 935 receive a plurality of yield values by digital gain control signal Cgd representative between the time, tranmittance also stores respectively to measure local maximum and minimum value than their relation, after at least one local maximum and at least one local minimum obtain, then export ranking operation device 931 to calculate switching value and to produce according to this gain switching signal Sf.Controller 910 be subject to the gaining notice of switching signal Sf, the source that makes digital gain control signal Cgd produce switches to gain switching signal Sf from above-mentioned gain signal Sg, thereby controls the yield value of variable gain amplifying unit 810.Under the fixed reception environment, after can implementing controller 910 and waiting for that these new yield values come into force, the source that makes digital gain control signal Cgd produce reverts to gain signal Sg, so can draw and control result as the gain of Fig. 3 D.
In addition, switching value determining means 930A also can be in order to implement as shown in Figure 5 B, to utilize the yield value variation relation, and utilize its single order differential or even second order is micro-to determine the example of local maximum and local minimum.When implementation, switching value determining means 930A also can set up single order differentiator or second-order differential device.
In addition, Fig. 9 B is depicted as another embodiment of control unit 840, and the control unit 900A difference shown in itself and Fig. 9 A is that the switching value determining means 930B of the control unit 900B in Fig. 9 B detects the second-order differential of time dependent relation of at least one yield value as characteristic value.So, can be in order to implement characteristic value and switching point deciding means as shown in Figure 6.Switching value determining means 930B for example comprises a second-order differential device 936, switching value retrieval control unit 938 and a buffer 939.Second-order differential device 936 receives digital gain control signal Cgd, and the numerical value of change in gain is carried out to the processing of second-order differential signal.Switching value retrieval control unit 938 detects time point the output signal that second-order differentials are zero, control buffer 939 and store now corresponding gain values, and and then produce gain switching signal Sf, with notification controller 910.So, the source that controller 910 makes digital gain control signal Cgd produce switches to gain switching signal Sf from above-mentioned gain signal Sg, and this is similar to above-mentioned controller 910 function modes, therefore repeat no more.
Please refer to Fig. 8 B, it is another embodiment according to automatic gain control equipment of the present invention.The difference of embodiment shown in this embodiment and Fig. 8 A is: the control unit 840B of Fig. 8 B automatic gain control equipment produces above-mentioned analog gain control signal Cga in order to foundation gain signal Sg and comparison signal Sc.The control unit 840B of this embodiment searching modes, also has the tracking pattern except implementing, so applicable in the mobile reception environment.So, this embodiment can implement the embodiment of the auto gain control method as shown in Fig. 4 B or Fig. 4 C.
In the tracking pattern, whether control unit 840B periodically adjusts analog gain control signal Cga according to comparison signal Sc with decision increases yield value, reduce or remain unchanged with representative.Yield value controlled cycle in the tracking pattern is greater than yield value controlled cycle in searching modes.
In the tracking pattern, control unit 840B for example can be with reference to the gain delta as Fig. 7 A, Fig. 7 B or Fig. 7 C and the relation of comparative result, to adjust analog gain control signal Cga.In other embodiments, control unit 840B the relation of comparison signal Sc and analog gain control signal Cga can be embodied as a functional relation with sequencing mode or hardware circuit mode to be implemented among control unit 840B.In addition, in the different execution modes of control unit 840B, also can additionally add internal memory (not illustrating), with the signal that helps control unit 840 to store to be read and the data in processing procedure, or the numerical value of gain control signal Cga.Certainly, internal memory is built in control unit 840B in also can being designed to.
In addition, control unit 840B also can implement with other circuit element.Refer to the embodiment that Fig. 9 C illustrate is control unit 840B.In Fig. 9 C, control unit 900C gain acceptance in signal Sg and comparison signal Sc, and produce according to this analog gain control signal Cga.Control unit 900C comprises a controller 910, a switching value determining means 930, a gain tracing unit 940A, gain storage element 970 and digital analog converter 990.With respect to the control unit shown in Fig. 9 A or Fig. 9 B, control unit 900C has also comprised that gain tracing unit 940A is to realize the tracking pattern, in the tracking pattern, and the gain trace signals St of controller 910 receiving gain tracing unit 940A.
Switching value determining means 930 is to realize searching modes, is for example switching value determining means 930A or 930B.
Gain tracing unit 940A accepts digital gain control signal Cgd and comparison signal Sc, to produce gain trace signals St.
Refer again to Fig. 9 C, the embodiment of gain tracing unit 940A comprises a tracking value generator 950A, a latch unit 959 and a periodic pulses generator 961.Gain tracing unit 940A periodically according to comparison signal Sc to produce gain trace signals St.So, in the tracking pattern, output in order to the circuit that produces a gain delta transfer function offers a holder, for example latch unit 959, and periodically produce frequency to control the output of latch unit by a pulse generator 961, this trace signals St that periodically gains is that to make yield value controlled cycle in the tracking pattern be to be greater than yield value controlled cycle in searching modes.
In Fig. 9 C, tracking value generator 950A comprises that a function generating circuit 951a, produces arithmetic element 952, an adder 953, a subtracter 955, a multiplexer 957 of absolute value.Arithmetic element 952 is to obtain the absolute value Sca of the comparative result of comparison signal Sc representative.And function generating circuit 951a in order to the absolute value Sca according to this comparative result as input, realize the output of a gain delta transfer function B (); For example, gain delta transfer function B () can be considered first of gain delta transfer function A () in Fig. 7 A, Fig. 7 B or Fig. 7 C and resembles the corresponding function in boundary, gain delta transfer function B () corresponding on the occasion of input, have on the occasion of output.Multiplexer 957 has the input on three tunnels and control or the judgement input on a road, is for example Sc.When Sc is greater than a threshold value THD and Sc is timing, multiplexer 957 is selected subtracter 955 outputs of Third Roads, that is the digital gain control signal Cgd of the last time of gain storage element 970 outputs cuts the result of gain delta transfer function 951a output.When Sc is greater than threshold value THD and Sc when negative, multiplexer 957 is selected the output of the adder 953 of the first via, that is the digital gain control signal Cgd of the last time of gain storage element 970 outputs adds the result of gain delta transfer function 951a output.Remaining situation, multiplexer 957 is selected the second tunnel gain storage element 970 outputs.
In addition, another example of tracking value generator 950A please refer to the embodiment of Fig. 9 D, and the difference of this embodiment and Fig. 9 C only is that tracking value generator 950A changes tracking value generator 950B into.Tracking value generator 950B comprises a function generating circuit 951b and adder 953.Function generating circuit 951b as input, realizes the output of a gain delta transfer function A () in order to the comparative result of foundation comparison signal Sc.For example, the gain delta transfer function A () shown in Fig. 7 A, Fig. 7 B or Fig. 7 C.The last digital gain control signal Cgd of adder 953 output adds the result of gain delta transfer function 951b output.According to the size of the comparative result of comparison signal, function generating circuit 951b is for example according to the gain delta transfer function A () shown in Fig. 7 A, Fig. 7 B or Fig. 7 C, output on the occasion of the result or zero of A () of result, negative value of A ().And above-mentioned function generating circuit 951a or 951b are to realize with hardware by the mode of tabling look-up or calculate.
As for an execution mode of detecting unit 830, as shown in Figure 8, detecting unit 830 comprises: a power detector (power detector) 831, one comparator 833 and a loop filter (loop filter) 835.Power detector 830, in order to the average power of foundation digital signal Sd decision digital signal Sd.Comparator 833, in order to average power and the target level signal of comparative figures signal Sd, produce comparison signal Sc.Loop filter 835, produce gain signal Sg in order to foundation comparison signal Sc.In addition, in other embodiments, detecting unit 830 can be implemented with the various integration of different power detectors, peak detector, comparator and loop filter or the mode of combination.In addition, the detecting unit in Fig. 8 A or Fig. 8 B 830 also can be considered a main control unit with its control unit and makes and integrating or other modes are implemented.
For example, in other embodiments, the detecting unit 830 of Fig. 8 A or Fig. 8 B can be combined into a control unit with its control unit, and example is with control unit 1010 as shown in figure 10, and it is to implement with treatment circuit, digital signal processor or the logical circuit of programmable.In addition, analog-digital converter 820 and control unit 1010 can be used the microcontroller of built-in analog-digital converter or digital signal processor with implementation.
Moreover below to take gain curve figure and the automatic gain control equipment 1000 of Figure 11 A be example, the proper proportion that illustrates searching modes in above-described embodiment measures mode and switching point account form.Utilize automatic gain control equipment 1000, can see through the situation that measures the time dependent relation of gain, or the variation of gain curve, the proper proportion that switching value is calculated obtained.At first, utilize control unit 1010 to observe the level of long-time gain convergence, be set as the perfect Gain level.The perfect Gain level 1101 of gain curve 1100 as shown in Figure 11 A.Then, record a maximum MAX of gain curve and minimum value MIN respectively with the difference D of the perfect Gain level
maxwith D
min, as the arrow 1110 in Figure 11 A and 1115 represented sizes values or the arrow 1130 in Figure 11 B and 1135 represented sizes values.Proper proportion R is set as R=D
min/ (D
max+ D
min).
So, control unit 840 calculates switching value according to this proper proportion R, and illustrates with Figure 11 A and Figure 11 B.If maximum occurs prior to minimum value, as shown in Figure 11 A, switching value can be set as MAXR+MIN (1-R).If minimum value occurs prior to maximum, as shown in Figure 11 B, switching value can be set as MINR+MAX (1-R).
In addition, please refer to the calcspar of another embodiment of the automatic gain control equipment of the present invention that Figure 12 illustrates.Automatic gain control equipment 1200 can also be implemented the embodiment of auto gain control method of the present invention, and the embodiment in aforesaid Fig. 8 different be in: utilize power discriminator (discriminator) 1210 to reach the effect as the power detector 831 in Fig. 8 and comparator 833, to produce comparison signal Sc.In an example, power discriminator 1210 comprises power detector 831 and comparator 833.In addition, automatic gain control equipment 1200 also comprises a control unit 1220.Control unit 1220 is different from aforesaid control unit 900, is to comprise a loop filter 1230, a gain detector 1250, gain tracker 1270 and a controller 1290.Loop filter 1230 is the loop filter 835 in Fig. 8 for example.After power discriminator 1210 receives the analog-digital converter sampling, signal produces comparison signal Sc.Comparison signal Sc inputs to loop filter 1230 and gain tracker 1270.The output signal Sl of gain curve the gain signal Sg based on loop filter 1230 outputs, gain detector by controller 1290 produces with the gain trace signals St of gain tracker generation.Gain detector 1250 is switching value determining means 930 for example.In another example, gain detector 1250 can be embodied as gain detector 1250 and find and the recording feature values, local maximum and minimum value for example, and the calculating of switching point is judged and is calculated by the controller 1290 with calculation function.Gain tracker 1270 is for example gain tracing unit 940A or 940B.Controller 1290 is for example processor or other logical circuit of programmable, gain acceptance in signal Sg, output signal Sl and gain trace signals St, as the searching modes of automatic gain control equipment in above-mentioned embodiment and the running of the pattern of tracking, controller 1290 is taken the source produced as digital gain control signal Cg (or analog gain control signal Cga) of above-mentioned signal Sg, Sl and St, thereby controls variable gain amplifying unit 810.
In addition, the automatic gain control equipment 1200 based on Figure 12, in one is applicable to the embodiment of fixed reception environment, the tracker 1270 that can embodiment gains, and gain detector 1250 is for example with switching value determining means 930.
For above-mentioned Fig. 9 A to Fig. 9 D and embodiment illustrated in fig. 12 in controller (as 910 or 1290), in other example, the gain storage element 970 can be incorporated into controller in.In addition, in other example, for implementing the embodiment of auto gain control method as shown in Figure 4 C, controller can be accepted situation or the parameter of a signal from communication system to learn reception environment in addition, with optionally according to reception environment and actual situation, for example whether at a high speed or low speed mobile environment, and determines whether further to carry out the tracking pattern.
In addition, the embodiment based on shown in Fig. 9 A to Fig. 9 D or Figure 12, in other example, digital analog converter 990 can be independent of beyond control unit or be included in control unit.
In addition, embodiment based on shown in Fig. 8 A, Fig. 8 B, Figure 10 or Figure 12, in other example, variable gain amplifying unit 810 be change with other can accept digital signal (as digital gain control signal Cgd) but with variable gain amplifying unit or the program variable gain amplifying unit of ride gain value, so can use digital analog converter 990 to produce analog gain control signal Cga.But variable or program gain amplifying unit for example see through digital interface as serial peripheral interface (SPI) or an integrated circuit agreement (I2C) with ride gain.
The above embodiment of the present invention has disclosed auto gain control method and device.It realizes searching modes, in the process of gain convergence, determines at least one switching value, to shorten the gain convergence time; In addition, other embodiment also further realizes the tracking pattern, promotes under the mobile reception environment when path loss compensates and can reduce the impact of noise on system.So the gain convergence rate under various reception environments is improved, signal receives effect and also can improve.
In sum, although the present invention discloses as above with embodiment, so it is not in order to limit the present invention.The persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when doing various also moving and retouchings.Therefore, protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (29)
1. an auto gain control method, the method comprises:
(a) in a searching modes, one yield value of one reception signal is gained when adjusting, situation of change according to a gain curve of this yield value, change in addition this yield value at least one times so that this yield value tends to a target gain level, wherein, the step that changes in addition this yield value comprises:
Detect at least one characteristic point of this gain curve, at least one characteristic point of this of this gain curve comprises the single order differential of this gain curve or the point that second-order differential is 0;
This at least one characteristic point according to detecting, determine a switching value, and this switching value is with so that this yield value approaches this target gain level; And
According to this switching value, to set this yield value be a new gain value and make it to come into force;
The step of wherein, this detection, this decision and this setting at least is performed once.
2. auto gain control method as claimed in claim 1, it is characterized in that, in the step of this detection of this step (a), at least one characteristic point of this of this gain curve comprises: the point that the point that at least one local maximum of this gain curve is corresponding and at least one local minimum are corresponding.
3. auto gain control method as claimed in claim 2, it is characterized in that, in the step of this detection of this step (a), at least one local maximum of this gain curve and at least one local minimum be dependent on this gain curve obtained in a time interval at least two vicinities stationary point and determine.
4. auto gain control method as claimed in claim 1, is characterized in that, the method also comprises:
(b) after this step of setting this yield value is performed for the last time, enter a tracking pattern, in this tracking pattern, periodically judge whether to adjust this yield value, wherein, this yield value controlled cycle in this tracking pattern is greater than the cycle that this yield value is carried out this gain adjustment in this searching modes.
5. auto gain control method as claimed in claim 4, is characterized in that, this step (b) also comprises:
After this step of setting this yield value is performed for the last time, if this reception signal is while receiving in a mobile reception environment, this tracking pattern begins to enter.
6. auto gain control method as claimed in claim 4, is characterized in that, in this step (b), periodically according to the intensity estimated value of this reception signal and the comparative result of a preset signals intensity, with decision, adjusts this yield value or make it to remain unchanged.
7. auto gain control method as claimed in claim 6, is characterized in that, in this step (b):
If the absolute value of this comparative result is not more than a threshold value, this yield value remains unchanged;
If the absolute value of this comparative result is greater than the intensity estimated value of this threshold value and this reception signal and is greater than this preset signals intensity, reduce this yield value;
If the absolute value of this comparative result is greater than the intensity estimated value of this threshold value and this reception signal and is less than this preset signals intensity, increase this yield value.
8. an automatic gain control equipment is characterized in that this device comprises:
One variable gain amplifying unit, receive signal to produce a first signal in order to control one according to a yield value;
One analog-digital converter, in order to produce a digital signal according to this first signal; And
One main control unit, in order to according to this digital signal and a target level, to produce a gain control signal, wherein, this yield value of this variable gain amplifier is to adjust according to this gain control signal;
Wherein, when this main control unit operates in a searching modes, this main control unit is when this yield value gains adjustment, determine a switching value according at least one characteristic point of the time dependent relation of this yield value, this switching value is with so that this yield value approaches a target gain level, and this at least one characteristic point of the time dependent relation of this yield value comprises the single order differential of the time dependent relation of this yield value or the point that second-order differential is 0.
9. automatic gain control equipment as claimed in claim 8, it is characterized in that, this at least one characteristic point that at least one characteristic point that this main control unit detects the time dependent relation of numerical value of this gain control signal is usingd as the time dependent relation of this yield value is to determine this switching value, and set this gain control signal according to this switching value, so that this yield value approaches this target gain level.
10. automatic gain control equipment as claimed in claim 8, is characterized in that, this main control unit comprises:
One detecting unit, in order to according to this digital signal and this target level, produce a gain signal; And
One control unit, in order to produce this gain control signal according to this gain signal;
Wherein, when this control unit is while operating in this searching modes, this control unit, when this yield value gains adjustment, according to this at least one characteristic point of the time dependent relation of this yield value, is set this yield value at least one times so that this yield value tends to this target gain level in addition.
11. automatic gain control equipment as claimed in claim 10, is characterized in that, this detecting unit comprises:
One power detector, in order to determine the average power of this digital signal according to this digital signal;
One comparator, in order to relatively this average power and this target level, produce a comparison signal; And
One loop filter, in order to produce this gain signal according to this comparison signal.
12. automatic gain control equipment as claimed in claim 10, it is characterized in that, this at least one characteristic point that at least one characteristic point that this control unit detects the time dependent relation of numerical value of this gain control signal is usingd as the time dependent relation of this yield value to be to determine this switching value, and according to this switching value to set this gain control signal to set in addition this yield value so that this yield value approaches this target gain level.
13. automatic gain control equipment as claimed in claim 10, is characterized in that, this control unit comprises:
One switching value determining means, according to this gain control signal, detect at least one characteristic point of the time dependent relation of this yield value, to obtain this switching value to produce a gain switching signal; And
One controller, in order to receive this gain signal, this gain switching signal, and produce this gain control signal according to this; Wherein, in this searching modes, this controller is set this gain control signal to set this yield value according to this gain switching signal.
14. automatic gain control equipment as claimed in claim 13, is characterized in that, this switching value determining means comprises a differentiator.
15. automatic gain control equipment as claimed in claim 10 is characterized in that:
After last this yield value of setting in addition comes into force, this main control unit enters a tracking pattern, in this tracking pattern, this main control unit periodically judges whether to adjust this yield value, wherein, this yield value controlled cycle in this tracking pattern is greater than the cycle that this yield value is carried out this gain adjustment in this searching modes.
16. automatic gain control equipment as claimed in claim 15, is characterized in that, this control unit also comprises:
One gain tracing unit, in this tracking pattern, according to this gain control signal and a comparison signal, periodically determine whether adjust this gain control signal, to produce a gain trace signals;
Wherein, this detecting unit also produces this comparison signal according to this digital signal and this target level signal; In this tracking pattern, this controller is also adjusted this gain control signal to set this yield value according to this gain trace signals.
17. automatic gain control equipment as claimed in claim 8, is characterized in that, this main control unit comprises:
One power discriminator, in order to according to this digital signal and a target level signal, produce a comparison signal; And
One control unit, in order to produce this gain control signal according to this comparison signal;
Wherein, when this control unit operates in this searching modes, this control unit, when this yield value gains adjustment, according to this at least one characteristic point of the time dependent relation of this yield value, is set this yield value at least one times so that this yield value tends to this target gain level in addition.
18. automatic gain control equipment as claimed in claim 17, it is characterized in that, this at least one characteristic point that at least one characteristic point that this control unit detects the time dependent relation of numerical value of this gain control signal is usingd as the time dependent relation of this yield value to be to determine this switching value, and according to this switching value to set this gain control signal to set in addition this yield value so that this yield value approaches this target gain level.
19. automatic gain control equipment as claimed in claim 17, it is characterized in that, this control unit comprises a loop filter, and in order to produce a gain signal according to this comparison signal to obtain a gain curve, this gain curve means the time dependent relation of this yield value.
20. automatic gain control equipment as claimed in claim 19 is characterized in that:
After last this yield value of setting in addition comes into force, this main control unit enters a tracking pattern, in this tracking pattern, this main control unit periodically judges whether to adjust this yield value, wherein, this yield value controlled cycle in this tracking pattern is greater than the cycle that this yield value is carried out this gain adjustment in this searching modes.
21. automatic gain control equipment as claimed in claim 20 is characterized in that this control unit also comprises:
One gain detecting unit, according to this gain control signal, detect local maximum and the minimum value of this gain curve, to obtain an output signal;
One gain tracing unit, in this tracking pattern, according to this gain control signal and this comparison signal, periodically determine whether adjust this gain control signal, to produce a gain trace signals; And
One controller, in order to receive this gain signal, this output signal and this gain trace signals, and produce this gain control signal according to this; Wherein, in this searching modes, this controller is set this gain control signal to set this yield value according to this output signal; In this tracking pattern, this controller is adjusted this gain control signal according to this gain trace signals.
22. automatic gain control equipment as claimed in claim 8 characterized by further comprising:
One gain storage element, in order to store this gain control signal.
23. automatic gain control equipment as claimed in claim 8 characterized by further comprising:
One digital analog converter, in order to according to this gain control signal to produce the gain control signal of a simulation.
24. as the described automatic gain control equipment of arbitrary claim in claim 8 to 23, it is characterized in that, in this searching modes, this at least one characteristic point of the time dependent relation of this yield value comprises: at least one local maximum of the time dependent relation of this yield value and at least one local minimum.
25. automatic gain control equipment as claimed in claim 24, it is characterized in that, this at least one local maximum and at least one local minimum are upper contiguous and can make a gain curve of the correspondence of this yield value be essentially zero yield value and determine the single order differential of time according at least two times of the time dependent relation of this yield value obtained in a time interval.
26. as claim 9,12,13,14,18 or 20 described automatic gain control equipments, it is characterized in that, in this searching modes, this at least one characteristic point of the time dependent relation of this yield value comprises: at least one local maximum of the time dependent relation of this yield value and at least one local minimum; This switching value determines according to the relation of input signal power, output signal power and the gain of this at least one characteristic point of the time dependent relation of this yield value and this variable gain amplifying unit and the relation of input signal and gain.
27. as claim 15,16,20 or 21 described automatic gain control equipments, it is characterized in that, when last set in addition this yield value and come into force after, if this automatic gain control equipment is in a mobile reception environment time, this tracking pattern begins to enter.
28. as claim 15,16,20 or 21 described automatic gain control equipments, it is characterized in that, after entering this tracking pattern, this main control unit is periodically adjusted this yield value or makes it to remain unchanged with decision according to the intensity estimated value of this reception signal and the comparative result of a preset signals intensity.
29. automatic gain control equipment as claimed in claim 28 is characterized in that:
If the absolute value of this comparative result is not more than a threshold value, this main control unit determines that this yield value remains unchanged;
If the absolute value of this comparative result is greater than the intensity estimated value of this threshold value and this reception signal and is greater than this preset signals intensity, this main control unit determines to reduce this yield value;
If the absolute value of this comparative result is greater than the intensity estimated value of this threshold value and this reception signal and is less than this preset signals intensity, this main control unit determines to increase this yield value.
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| EP2787746A1 (en) * | 2013-04-05 | 2014-10-08 | Koninklijke Philips N.V. | Apparatus and method for improving the audibility of specific sounds to a user |
| CN104362993A (en) * | 2014-11-17 | 2015-02-18 | 中环天仪股份有限公司 | Automatic gain adjustment control method of liquid ultrasonic flow meter |
| CN105811975B (en) * | 2014-12-30 | 2018-11-27 | 展讯通信（上海）有限公司 | A kind of method and device reducing quantizing noise |
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