TW436609B

TW436609B - Signal processing method and circuit for range finder

Info

Publication number: TW436609B
Application number: TW88112862A
Authority: TW
Inventors: Bi-Yau Jian; Ruei-Feng Huang; Jia-Rung Wu; Jr-Wei Hung
Original assignee: Asia Optical Co Inc
Priority date: 1999-07-29
Filing date: 1999-07-29
Publication date: 2001-05-28

Abstract

This invention is about the signal processing method and circuit that can be used for range finder. The concept is based on the concept that noise signal is a randomly appeared phenomenon such that the same probing procedure is repeated several times and, after the obtained signals are statically processed, the target object signal is extracted according to the statistical data. At first, a probing wave is emitted to probe a desired object. Then, the reflected wave of the probing wave is received and plural signals among the reflected wave are recorded. After the procedure stated above are repeated several times, a statistical data is obtained. According to the statistical data but not the signal intensity, the information of the desired object is calculated. The characteristic of circuit is that the removal of noise signal is not necessary and the received signal is amplified, reshaped as much as possible so as to make it convenient for the statistical calculation. Therefore, target can be detected under the condition that amplitude ratio of signal/noise is smaller than 1 (S/N < 1).

Description

1 43 66 〇 g 五、發明說明（1) ' 【技術領域】本發明係關於一種信號處理方法及其電路，特別是關於一種於探測儀上，用於接收、處理探測信號之方法及其電路。 ‘ 【發明的背景】測距儀，特別是^以雷射光基礎之雷射測距儀，多年來已廣被應用於量測一遠距之物體或目標的距離。若以雷射測距儀為例，其量測的方法基本上是：發射出一雷射光脈衝（laser plus)射向目標物’同時以一光感偵測器（photo sensor)開始接收由外界反射回來之雷射光的信號。而後比較發出雷射光脈衝的時間，與接收到雷射反射光的時間’從而可得出其間的時間差。再將此時間差乘上光速再除以2，便可計算出雷射測距儀與目標物間的距離〇故然在雷射測距儀上，往往會在一些鏡頭上鍍膜，使其僅容許特定波長（所發出之雷射光的波長）之光線通過，以抑制非反射自目標物的光線干擾光感偵測器的運作。然而還是會有來自於外界的光源，如陽光；以及來自於路徑上微粒的反射；以及雷射光本身散射、漫射所反射回之訊號等等進入雷射測距儀中，因此光感偵測器往往不可能只接收到一個單一訊號，而是會接收到數個訊號而使人無從分辨何者方為目標物所反射回來的信號。如第la圖，一雷射發射脈衝示意圖’及第1 b圖，一光感偵測器之收訊示意圖所不’當雷射光啟動脈衝11之後，光感偵測器接收到數個雷射光信號1 2。因此對一雷射測距儀而言’必需有一信1 43 66 〇g 5. Description of the invention (1) 'Technical Field' The present invention relates to a signal processing method and a circuit thereof, and more particularly to a method for receiving and processing a detection signal on a detector and a circuit therefor. . ‘[Background of the invention] Rangefinders, especially laser rangefinders based on laser light, have been widely used for many years to measure the distance of a distant object or target. If a laser rangefinder is used as an example, the measurement method is basically: emitting a laser light pulse (laser plus) to the target object, and at the same time using a photo sensor to start receiving from the outside world The signal of the reflected laser light. Then, compare the time when the laser light pulse is emitted with the time when the laser reflected light is received, so as to obtain the time difference therebetween. Then multiply this time difference by the speed of light and divide by 2 to calculate the distance between the laser rangefinder and the target. Therefore, on the laser rangefinder, there are often coatings on some lenses, which only allows Light of a specific wavelength (the wavelength of the emitted laser light) passes to suppress the light that is not reflected from the target from interfering with the operation of the light sensor. However, there will still be light sources from the outside, such as sunlight; reflections from particles on the path; and laser light scattering, diffused and reflected signals, etc. into the laser rangefinder, so light detection It is often impossible for a device to receive only a single signal, but it will receive several signals, making it impossible for a person to distinguish which signal is reflected by the target. As shown in Fig. La, a schematic diagram of a laser transmitting pulse 'and Fig. 1b, a schematic diagram of a light receiving detector's receiving signal' When the laser light starts pulse 11, the light detecting detector receives several laser lights Signal 1 2. So for a laser rangefinder, there must be a letter

第4頁【4366 〇 9 五、發明說明（2) 號處理之方法及電路，協助系統辨視出來自目標物的訊號 (target signal) 〇一般在一定距離内，由於雷射光係被集束的射向目標. 物，因此反射自目標物的信號往往會大於途中散射、漫射而返回的信號。所以習知技藝的信號處理方法，如美國專利5, 574, 552中所示·，乃利用「目標物反射信號的強度（電壓振幅）會大於雜訊」的現象，推衍出一「設一門檻電壓，以將所有小信號忽略或濾除，只考慮大於門檻電壓之信號」的方法來判別真正來自於目標物的訊號。如第2圖所示，其於電路中設一門檻電壓（threshold vol tage)21，以濾除所有小於此門檻電壓的信號。其電路於雷射脈衝發出時，會對一電容開始充電，待收到一大於該門檻電壓21的信號時，便停止對該電容的充電，並改為開始放電。計算該電容的充放電的時間，再經適當的計算，便可得到被測物的距離。而為了因應不同的狀況，在美國專利5, 612, 779中更揭出一種可自動調整門檻電壓的設計。在該前案中，門植電壓可隨目標物反射信號之強度變化而變化，務使在不同環境中’仍可設定出一介於雜訊及目標物訊強度之間的門檻電壓。然而’由於習知技藝係建立在「目標物反射信號的強度（電壓振幅）會大於雜訊j這個前提之L，故一旦當被測物極遠’以致於其反射信號，衰弱至小於一般雜訊時，習知技藝便無法再進行偵測。Page 4 [4366 〇9 V. Method and circuit of invention description (2) processing, to assist the system to identify the target signal from the target object 〇 Generally within a certain distance, because the laser light is focused by the beam To the target. Therefore, the signal reflected from the target is often larger than the signal returned by scattering and diffusion on the way. Therefore, the conventional signal processing method, as shown in US Patent No. 5,574,552, uses the phenomenon that the intensity (voltage amplitude) of the reflected signal of the target object is greater than the noise, and derives a "set one" Threshold voltage, in order to ignore or filter out all small signals, and only consider signals larger than the threshold voltage "to determine the signal that really comes from the target. As shown in Figure 2, a threshold voltage 21 is set in the circuit to filter out all signals less than this threshold voltage. The circuit starts to charge a capacitor when a laser pulse is sent. When a signal greater than the threshold voltage 21 is received, it stops charging the capacitor and starts discharging instead. Calculate the charging and discharging time of the capacitor, and then calculate the distance of the measured object through proper calculation. In order to respond to different situations, a design that can automatically adjust the threshold voltage is disclosed in U.S. Patent 5,612,779. In the previous case, the gate plant voltage can change with the intensity of the reflected signal of the target, so that in different environments, a threshold voltage between noise and the intensity of the target signal can still be set. However, 'as the conventional technique is based on the premise that the intensity of the reflected signal (voltage amplitude) of the target object will be greater than L on the premise of noise j, so once the measured object is far away', so that its reflected signal weakens to less than ordinary noise. At the time of hearing, the know-how can no longer be detected.

KHHHI 4366 〇 9KHHHI 4366 〇 9

五、a 皆明說明（3) [ 發明概述 ] L. 本發明的的在於提出一種信號處理方法及電路。本發明之另一目的在於提出一種，在訊號/雜訊振幅比小於1( S/N < 1)的情況下*仍能偵測目標之信號處理方法及電路〇本發明的觀念在.於「利用雜訊乃隨機出現的現象，將同一探測步驟重複數次並將所得之信號加以統計，後依該統計資料求出 3 標物信號」 0 以測距為例，請參考第3a圖，及第3b 圖。第一時間點 31 及第二時間點3 2分別代表一對應的距離A及距離B。假設今有一固定的待測物位於距離B上則在定點的測距過程中 ’每向該待測物探測一次，便可在第二時間點3 2上收得 — 信號。相反的，由於雜訊是以隨機的方式出現，因此在第一時間點31 處將時而有信訊，時而無訊號。因此若今對固定的待測物進行數次定點量測並加以統計’由於目標物信號的出現機率大於其他各處，所以統計資料的向點便可視為是 § 標物的所在。是以 * 由於所依據者乃信號的統計次數（或發生的；^ 率），所以即使目標物的信號強度小於雜訊只要其乃是可被接收的 ) 便無損於本發明之探測能力 0 是以本發明可以工作在訊號/雜訊振幅比小於1 ( S/N < 1) 的情況下。同時由於本發明不以信號的強弱來做為計算距離的依據，因此便不需設_門檻電壓以分隔目標物信號 (target si gna〇及雜訊（no i se) ° 異於前案的’而是同時V. a is clearly stated (3) [Overview of the invention] L. What the present invention is to propose a signal processing method and circuit. Another object of the present invention is to propose a signal processing method and circuit that can still detect a target in the case where the signal / noise amplitude ratio is less than 1 (S / N < 1). The concept of the present invention is in "Using noise is a phenomenon that occurs randomly, repeat the same detection step several times and count the obtained signals, and then obtain the 3 target signal based on the statistical data." 0 Take ranging as an example, please refer to Figure 3a. And Figure 3b. The first time point 31 and the second time point 32 represent a corresponding distance A and distance B, respectively. Suppose that there is a fixed object to be measured at distance B. During the fixed-point distance measurement process, every time you detect the object, you can receive a signal at the second time point 32. On the contrary, because noise appears in a random manner, there will be a signal from time to time at 31, and sometimes no signal. Therefore, if we take a number of fixed-point measurements on a fixed object to be measured today and make statistics, since the probability of the signal of the target object is greater than everywhere else, the direction of the statistical data can be regarded as the location of the object. It is because * is based on the statistical count of the signal (or occurrence; ^ rate), so even if the signal strength of the target is less than the noise, as long as it is receivable, it will not damage the detection ability of the present invention. 0 Yes The present invention can work in the case where the signal / noise amplitude ratio is less than 1 (S / N < 1). At the same time, the invention does not use the strength of the signal as the basis for calculating the distance, so there is no need to set a threshold voltage to separate the target signal (target si gna〇 and noise (no i se) ° different from the previous case ' But at the same time

J 4366 〇 9 五、發明說明（4) 〜接收複個‘信號（包含目標物信號及雜訊），經計錄、統計後’於完成統計結果後才以此資料來計算求取被探測物的距離。而對一移動的待測物而言’由於光線的速度及電子處理的時間極短，因此對測距儀而言’大部份的待測物皆仍可視為靜止’除非待.測物係以超高速移動，然而這對測距儀之使用者而言幾乎是不可能發生的情形。依據上述的觀念’在本發明中提出一種以次數而非強度來分辨目標物的方法’首先發出一探測波以探測一待測物’而後接收該探測波之反射波，記錄該反射波中的複數個仏號’重覆上述步驟數次後得一統計資料，依據此統計資料而非信號的強度，計算出待探測物的情報^其電路特徵在於不需去除雜訊，而是將所接收的信號，儘可能的放大、整形以利於計算統計。該電路至少包含有—接收電路及一放大整形電路’將信號適度處理，以便於計算。【圖示說明】 # 第la圖，為一雷射發射脈衝示意圖第1 b圖，為一光感偵測器之收訊示意圖第2圖，為習知技藝之信號處理示意圖第3a圖，為一測距收訊示意圖第3b圖，為一測距收訊示意圖第四圖1為本發明之實施例第5c圖，為本發明實施例之實驗記錄圖第6圖。為比較器電性圖J 4366 〇9 V. Description of the Invention (4) ~ Receive multiple 'signals (including target signals and noise), after recording and statistics', use this data to calculate and obtain the detected object after completing the statistical results distance. For a moving object to be measured 'because the speed of light and the electronic processing time are extremely short,' most of the object to be measured can still be regarded as stationary 'for a rangefinder unless it is to be measured. Moving at super high speeds, however this is almost impossible for users of rangefinders. According to the above-mentioned concept, “a method for resolving a target object by the number of times rather than the intensity is proposed in the present invention.” First, a probe wave is sent to detect a test object, and then the reflected wave of the probe wave is received, and the reflected wave is recorded. A plurality of slogans' repeated the above steps several times to obtain a statistical data. Based on this statistical data instead of the strength of the signal, the information of the object to be detected is calculated. The circuit is characterized by the need to remove noise, but to receive the received data. The signal is amplified and shaped as much as possible to facilitate the calculation of statistics. The circuit includes at least a receiving circuit and an amplifying and shaping circuit 'to moderately process the signal for easy calculation. [Illustration] # Fig. La is a schematic diagram of a laser transmitting pulse. Fig. 1b is a schematic diagram of receiving a light detector. Fig. 2 is a schematic diagram of signal processing of a conventional technique. Fig. 3a is FIG. 3b is a schematic diagram of ranging and receiving, and FIG. 4 is a schematic diagram of ranging and receiving. FIG. 1 is a diagram 5c of an embodiment of the present invention, and FIG. 6 is an experimental record diagram of an embodiment of the present invention. Comparator electrical diagram

t 4366 Ο 9 五、發明說明（5) 第7圖，為本實施例部份示意圖【最佳實施例說明】請參閱第4圖’為基於本發明之芕法，而設計之實施例。其包含有一感光元件APD41 ’用以接收雷射波脈衝，並依光線強度（intensi ty)的大小感應產生出強度相應的電流脈衝。APD41連接一前級放大區42，除了可將APD41之信號平均化之外，可用以將電流的信號脈衝放大轉換為電壓信號。經前級放大區42處理後之電壓信號經偏壓區43偏壓之後’進入南倍放大區44 ’其主要包含有一工作於線性區之比較器441(max-913)，其放大倍率約為5000倍。之後經放大後的信號進入整波區45，其主要包含有一整波ic 451以將原本的數比波形整形為易於計數之等寬等高的數位波（如第5c圖）。該整波1C 451主要的功能，在於將所收到的信號數位化，以利於電臑軟體計算信號波的位置。該整波1C 451的工作方式為：若收到一信號，其強度超過該整波1C 451的門襤電壓，其將會發出一方波信號；反之，若小於該門檻電壓，則不會發出信號。如第5a圖所示，其中第一電壓值51為雷射發射之啟動信號，第二電壓值52為感光元件APD41接收光線後所反應出之信號。第5b圖中，第三電壓值為經高倍放大區44後之信號’可看出APD41的信號已被巨祕的放大。第5c圖中，第四電壓值54為經整波區45後之信號，可見其第三電壓值中高低不平均之信號，已被轉為等強等寬之信號。相較於第5b圖中非等強等寬的信號而言，第5c圖中的信號由於其t 4366 Ο 9 V. Description of the invention (5) Figure 7 is a partial schematic diagram of this embodiment. [Best Embodiment Description] Please refer to Figure 4 'which is an embodiment designed based on the method of the present invention. It includes a photosensitive element APD41 ′ for receiving laser wave pulses and inductively generating current pulses of corresponding intensity according to the intensity of light intensity (intensi ty). The APD 41 is connected to a pre-amplification area 42. In addition to averaging the signals of the APD 41, it can be used to amplify and convert the signal pulses of current into voltage signals. The voltage signal processed by the pre-amplification region 42 is biased by the bias region 43 and enters the south magnification region 44. It mainly includes a comparator 441 (max-913) operating in the linear region, and its magnification is about 5000 times. After that, the amplified signal enters the whole wave area 45, which mainly contains a whole wave ic 451 to shape the original digital ratio waveform into digital waves of equal width and height that are easy to count (see Figure 5c). The main function of the full wave 1C 451 is to digitize the received signal to facilitate the software to calculate the position of the signal wave. The working mode of the full wave 1C 451 is: if a signal is received, the intensity of which exceeds the threshold voltage of the full wave 1C 451, it will send a square wave signal; otherwise, if it is less than the threshold voltage, it will not send a signal . As shown in Fig. 5a, the first voltage value 51 is a start signal for laser emission, and the second voltage value 52 is a signal reflected by the light receiving element APD41 after receiving light. In Fig. 5b, the third voltage value is the signal after the high magnification region 44. It can be seen that the signal of the APD 41 has been amplified by the giant secret. In Fig. 5c, the fourth voltage value 54 is a signal after the whole wave region 45, and it can be seen that the signal of the third voltage value having an uneven high and low voltage has been converted into a signal of equal strength and width. Compared to the non-equal-strength equal-width signal in Figure 5b, the signal in Figure 5c

第8頁 1 4366 0^ 五、發明說明（6) 等強，因此較易判斷信號的有無；等寬的信號則易於判斷信號所被接收到的時間點。是故此一整波區，可使信號更易於被計算統計。如前所述，在本發明主要係以次數而非強度來分辨目標物的方法，以統計資料而非信號的強度，計算出待探測物的情報°因此電路特徵在於不需去除雜訊，而是將APJJ 所接收到的信號’儘可能的放大、整形以利於計算統計。是故’為求最大的靈敏度及放大倍率，APD41可選擇性的將其操作電歷設定在其臨界電壓上.當APD41操作在臨界電壓上時，其將會極為敏感’只要有些微的光線便可使之產生電流脈衝。而比較器441則***作於線性區中。請參考第6圖，為本實施中所使用之比較器441 (max-91 3 )之電性圖，及第7 圖，為本實施例之部份示意圖。如第6圖所示，由於比較器441的線性區61僅有lmv的寬度，因此一旦輸入的信號較大，便會進入其飽和區而降低放大倍率。因此在設計上會避免輸入的信號超過線性區61，使比較器441可以工作於一穩定的基準點而避免飄移至飽和區。請參考第7圖，本實施例中將比較器441的輸出電壓，經一電阻711及並聯一電容712接回比較器的負輸入端，構成一低頻通過之回饋電路71。因此當正輸入端的電壓和負輸入端的電壓有變化差時，負輸入端的電壓會經®饋電路71而變化*用以抑制電壓差，而終使正輸入端電壓會近似於負輸入端電壓。故此一回饋電路71可使比較器441工作於一穩定的基準點而Page 8 1 4366 0 ^ V. Description of the invention (6) It is easier to judge the presence or absence of a signal; a signal of the same width is easier to judge the time point at which the signal was received. It is for this reason that the whole wave area can make the signal easier to be calculated and counted. As mentioned above, in the present invention, the method of distinguishing the target object by the number of times rather than the intensity is used to calculate the information of the object to be detected using statistical data rather than the intensity of the signal. Therefore, the circuit is characterized by the need to remove noise, and It is to enlarge and shape the signal received by APJJ as much as possible to facilitate the calculation of statistics. That's why 'for maximum sensitivity and magnification, the APD41 can optionally set its operating calendar at its threshold voltage. When the APD41 operates at the threshold voltage, it will be extremely sensitive' as long as there is a slight amount of light It can be used to generate current pulses. The comparator 441 is operated in the linear region. Please refer to FIG. 6, which is an electrical diagram of the comparator 441 (max-91 3) used in this implementation, and FIG. 7 is a partial schematic diagram of this embodiment. As shown in Fig. 6, since the linear region 61 of the comparator 441 has only the width of lmv, once the input signal is large, it will enter its saturation region and reduce the magnification. Therefore, in the design, the input signal is prevented from exceeding the linear region 61, so that the comparator 441 can work at a stable reference point and avoid drifting to the saturation region. Please refer to FIG. 7. In this embodiment, the output voltage of the comparator 441 is connected to the negative input terminal of the comparator via a resistor 711 and a capacitor 712 in parallel to form a low-frequency feedback circuit 71. Therefore, when there is a difference between the voltage at the positive input and the voltage at the negative input, the voltage at the negative input will change via the ®feed circuit 71 * to suppress the voltage difference, and finally the voltage at the positive input will approximate the voltage at the negative input. Therefore, a feedback circuit 71 can make the comparator 441 work at a stable reference point and

j： AS66 09 五、發明說明（7) ’ 避免飄移至飽和區β 此外，如前所述，整波1C 451係有一門檻電壓。為了提高本實施例的靈敏度，使之能儘可能的反應所有接收到的信號’因此在本實施例中更設有一偏壓區43使比較器 441的輪出電壓能維持於一偏壓上。該偏壓係調整至略小於該整波1C 451的門·檻電壓，因此當比較器441的輸出上有一脈衝時，便可輕易的突破整波1C 451的門檻電壓而被反應出’所以更能提高本實施例的靈敏度。所需特別說明的是，在本實施例中固然如前案般有一門播電壓’然而這是數位化程序中必然的措施，與前案中所設之門檻電壓有不同的設計意義。在前案中雖然也設有門襤電壓以消除雜訊，然而其係用於消除所有的雜訊β而在本發明中，之所以要更設有一偏壓區，則是儘可能的減低整波1C 451的門樣電壓的慮波功能’因此整個系統可被視為無門檻電壓的，因其只能消除一些極小，如來自已電路電磁干擾的雜訊’而非如前案般’消除了絕大多數的雜訊。本發明雖以雷射測距儀為例，但其並不以此範圍為限’而可轉應用於其他之探測技術，如聲納、地質探測、空間掃描等。本發明已以較佳實施例揭露如上，然其並用以限定本發明’任何熟習此技藝者，在不脫離:發明精神和範圍内’當可作些許之更動與潤飾，因此本發明保護範圍當視後附之申請專利範圍所界定者為準。之【圖式之符號說明】 7^1 — — 4366 Ο 9 五、發明說明（8)j: AS66 09 V. Description of the invention (7) ’Avoid drifting to the saturation region β In addition, as mentioned earlier, the whole wave 1C 451 has a threshold voltage. In order to improve the sensitivity of this embodiment, it can respond to all received signals as much as possible '. Therefore, in this embodiment, a bias region 43 is further provided so that the wheel-out voltage of the comparator 441 can be maintained at a bias. The bias voltage is adjusted to be slightly smaller than the threshold voltage of the full-wave 1C 451. Therefore, when there is a pulse on the output of the comparator 441, the threshold voltage of the full-wave 1C 451 can be easily broken and reflected. The sensitivity of this embodiment can be improved. It should be particularly noted that, in this embodiment, there is a gate voltage as in the previous case. However, this is an inevitable measure in the digitization process and has a different design significance from the threshold voltage set in the previous case. Although the gate voltage is also provided in the previous case to eliminate noise, it is used to eliminate all noise β. In the present invention, the reason for providing a bias region is to reduce the whole as much as possible. The wave-like function of the gate-like voltage of the 1C 451 wave, so the entire system can be considered as having no threshold voltage, because it can only eliminate some extremely small, such as noise from the electromagnetic interference of the circuit, rather than 'as in the previous case'. The vast majority of noise. Although the present invention takes a laser rangefinder as an example, it is not limited to this range and can be transferred to other detection technologies, such as sonar, geological exploration, and space scanning. The present invention has been disclosed as above with a preferred embodiment, but it is also used to limit the present invention. 'Any person skilled in the art can do some modifications and retouching without departing from the spirit and scope of the invention.' Therefore, the protection scope of the present invention should be Subject to the scope of the attached patent application. [Illustration of Symbols in the Drawings] 7 ^ 1 — — 4366 Ο 9 V. Description of the Invention (8)

11雷射光·啟動脈衝 12雷射光信號 2 1門檻電壓 31第一時間點 32第二時間點，41APD 4 2 前級放大區 4 3偏廢區 44 高倍放大區 441 比較器11 Laser light · Starting pulse 12 Laser light signal 2 1 Threshold voltage 31 First time point 32 Second time point, 41APD 4 2 Preamplification area 4 3 Waste area 44 High magnification area 441 Comparator

45 整波區 451整波1C 51第一電壓值 52第二電壓值 53第三電壓值 54第四電壓值 61 線性區 71回饋電路 711 電阻 712 電容45 whole wave area 451 whole wave 1C 51 first voltage value 52 second voltage value 53 third voltage value 54 fourth voltage value 61 linear area 71 feedback circuit 711 resistance 712 capacitance

Claims

^ 43 66 0 g -----—___ 六、申請專利範圍 ' —---------^ 種測距儀之信號處理方法，其係可探測一待探物之情報，該方法至少包含有： (a) 發出一探測波； (b) 接收反射波，其中該反射波中至少包含有隨機發生的雜訊及反射自該待測物之待測物信號； (c) 記錄該雜额u及該待測物信號； (d) 重覆步驟（a)至步驟（c)數次，以得一統計資料，該統計資料至少包含有該雜訊及該待測物信號之出現次數； (e )依據該統計資料，求取出該待測物的情報；其中’由於該方法係以統計次數而非信號強度來進行判斷’故於信说/雜訊比小於1的情況下，仍可工作。 2、如專利申請範圍第1項所述之測距儀之信號處理方法’其中’該探測波係為雷射光脈衝。 3、如專利申請範圍第1項所述之測距儀之信號處理方法’其中於步驟（b)之後，可更包含有：一放大步驟，係用以放大該雜訊及該待測物信號；一數位步驟，用以依該放大後之雜訊及放大後之待測物信號的強度，對應的輸出數位信號。 4、如專利申請範圍第1項所述之測距儀之信號處理方法，其中該統計資料更包含有：及該待測物信號之接收時間。 5、一種雷射測距儀之信號處理電路’可測量一待測物之距離，該電路至少包含有：^ 43 66 0 g ------___ VI. Scope of Patent Application '—--------- ^ Signal processing methods of rangefinders, which can detect the information of an object to be detected, the The method includes at least: (a) sending out a detection wave; (b) receiving a reflected wave, wherein the reflected wave includes at least random noise and a signal of the object reflected from the object; (c) recording The miscellaneous amount u and the signal of the object to be measured; (d) repeating steps (a) to (c) several times to obtain a statistical data, the statistical data including at least the noise and the signal of the object to be measured Occurrences; (e) Find out the information of the object to be tested according to the statistical data; where 'Because the method uses the number of statistics instead of the signal strength to judge', so in the case where the signal / noise ratio is less than 1 And still works. 2. The signal processing method of the rangefinder as described in item 1 of the scope of patent application, wherein the detection wave is a laser light pulse. 3. The signal processing method of the rangefinder as described in item 1 of the scope of the patent application, wherein after step (b), it may further include: an amplification step for amplifying the noise and the signal of the object under test A digital step for outputting digital signals corresponding to the amplified noise and the strength of the signal of the object to be measured after amplification; 4. The signal processing method of the rangefinder as described in item 1 of the scope of patent application, wherein the statistical data further includes: and the receiving time of the signal of the object under test. 5. A signal processing circuit of a laser rangefinder can measure the distance of an object to be measured. The circuit includes at least:

丨厶366 〇9 六、申請專利範圍 ^ 一雷射接枚電路，其中該雷射接收電路可依所接收到之雷射的強度，轉為第一電子訊號；一放大電路，相接於該雷射接收電路，可放大該第一電子訊號，輸出一第二電子訊號；一整波電路’相接於該放大電路，可依該第二電子訊號之強度’輸出等寬·等強之第三電子訊號，以便於程式計算。 6、如專利申請範圍第5項所述之一種雷射測距儀之信號處理電路，其中：該雷射接收電路中係包含有一感光元件。 7、如專利申請範圍第6項所述之一種雷射測距儀之信號處理電路，其中：該感光元件係工作於臨界電壓之上。 8、如專利申請範圍第5項所述之一種雷射測距儀之信號處理電路，其中，該放大電路係包含有：一前級放大電路；一高倍放大電路。 9、如專利申請範圍第8項所述之一種雷射測距儀之信號處理電路，其中：該命倍放大電路包含有y比較器。 1〇、如專利申請範圍第9項所述之一種雷射測距儀之信號處理電路’其中更包含有：一回饋電路，使該比較器可工作於線性區。 11、如專利申請範圍第5項所述之一種雷射測距儀之信號丨厶 366 〇9. Scope of patent application ^ A laser connection circuit, in which the laser receiving circuit can be converted into the first electronic signal according to the intensity of the received laser; an amplifier circuit is connected to the The laser receiving circuit can amplify the first electronic signal and output a second electronic signal; a full-wave circuit 'connected to the amplifying circuit and can output a uniform width and equal strength according to the strength of the second electronic signal' Three electronic signals to facilitate program calculation. 6. The signal processing circuit of a laser rangefinder as described in item 5 of the patent application scope, wherein: the laser receiving circuit includes a photosensitive element. 7. The signal processing circuit of a laser rangefinder as described in item 6 of the scope of patent application, wherein: the light sensing element works above a threshold voltage. 8. The signal processing circuit of a laser rangefinder as described in item 5 of the scope of patent application, wherein the amplifying circuit includes: a preamplifier circuit; a high magnification circuit. 9. A signal processing circuit for a laser rangefinder as described in item 8 of the scope of the patent application, wherein: the life multiplier circuit includes a y comparator. 10. A signal processing circuit of a laser rangefinder according to item 9 of the scope of patent application, which further includes: a feedback circuit that enables the comparator to operate in a linear region. 11.Signal of a laser rangefinder as described in item 5 of the scope of patent applications

^ 4366 09 六、申請專利範圍 .處理電路其中該整波電路包含有：一整波積體電路，該整波積體電路係具有數化位功能，該整波積體電路係有一門檻電壓，若該整波積體電路接收一大於該門檻電壓之信號，便會輸出一定高定寬之脈衝，反之則輸出一零伏特的電壓。 12 '如專利申請範圍·第11項所述之一種雷射測距儀之信號處理電路，其中更包含有：一偏壓電路，可提供該第二電子信號一略小於該門檻電壓之電壓偏移。^ 4366 09 VI. Patent application scope. Processing circuit The full wave circuit includes: a full wave integrated circuit, which has a digitizing function, and the full wave integrated circuit has a threshold voltage, If the whole wave integrated circuit receives a signal greater than the threshold voltage, it will output a pulse of a certain high fixed width, otherwise it will output a voltage of zero volts. 12 'The signal processing circuit of a laser rangefinder as described in the scope of patent application · item 11 further includes: a bias circuit which can provide the second electronic signal with a voltage slightly smaller than the threshold voltage Offset.

第14頁Page 14