201010428 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種信號補償裝置，且特別是有關於 一種避免產生拖影現象及過激現象之信號補償裝置、信號 補償方法及多電腦切換系統。 【先前技術】 隨著科技的日新月異，現今電腦主機輸出之視訊信號 ❹經由信號傳輸線已能傳遞至身處異地的顯示裝置。但是當 視訊信號經由信號傳輸線傳遞至顯示裝置時，視訊信號將 隨著傳輸路徑的逐漸增加而導致視訊信號的逐漸衰減。倘 若未進行任何的信號補償，則顯示晝面將會模糊而不清 晰。相反地，若對視訊信號過度地補償，則顯示畫面將出 現過激的現象，而降低顯示裝置的使用壽命。 為了解決此一問題，目前的補償方式係以每20公尺 為單位對視訊信號進行補償。然而，此種做法往往受限於 ❹現場環境，而無法正確地且有效地補償。舉例來說，原先 補償方式設定的尺度為10公尺、30公尺及50公尺，但現 場環境的距離卻為20公尺，此時則不知要設定為10公尺 或20公尺。倘若直接設定於10公尺，則顯示畫面將產生 拖影現象。但若直接設定於30公尺，顯示畫面卻又發生 過激現象。所以如何能提供一種正確且有效的信號補償方 式，乃業界所致力的主要課題之一。 201010428 【發明内容】 本發明係有關於一種信號補償裝置、信號補償方法及 多電腦切換系統。信號補償裝置、信號補償方法及多電腦 切換系統正確且有效的補償視訊信號，以避免產生過激現 象或拖影現象。 根據本發明，提出一種信號補償裝置。信號補償裝置 包括解差動單元、偵測單元、控制單元、濾波器及等化器。 解差動單元根據差動信號輸出單端信號。偵測單元根據單 ❿端信號輸出偵測信號。控制單元根據偵測信號輸出脈波寬 度調變信號。濾波器根據脈波寬度調變信號輸出直流信 號❶等化器根據直流信號補償視訊信號。 根據本發明，提出一種信號補償方法。信號補償方法 包括如下步驟：根據差動信號輸出單端信號；根據單端信 號輸出偵測信號；根據偵測信號輸出脈波寬度調變（Pulse Width Modulation，PWM )信號；根據PWM信號輸出直流信 號；以及根據直流信號補償視訊信號。201010428 IX. Description of the Invention: [Technical Field] The present invention relates to a signal compensation device, and more particularly to a signal compensation device, a signal compensation method and a multi-computer switching system for avoiding smear and over-excitation . [Prior Art] With the rapid development of technology, the video signal output by the computer mainframe can be transmitted to the display device in a different place via the signal transmission line. However, when the video signal is transmitted to the display device via the signal transmission line, the video signal will gradually attenuate the video signal as the transmission path is gradually increased. If no signal compensation is performed, the display will be blurred and unclear. Conversely, if the video signal is excessively compensated, the display screen will be over-excited and the life of the display device will be reduced. In order to solve this problem, the current compensation method compensates the video signal every 20 meters. However, this practice is often limited by the on-site environment and cannot be compensated correctly and effectively. For example, the original compensation method is set to 10 meters, 30 meters and 50 meters, but the distance in the field environment is 20 meters. At this time, it is not necessary to set it to 10 meters or 20 meters. If it is set directly at 10 meters, the display will produce smear. However, if it is set directly at 30 meters, the display screen will be over-excited. So how to provide a correct and effective signal compensation method is one of the main topics in the industry. 201010428 SUMMARY OF THE INVENTION The present invention is directed to a signal compensation apparatus, a signal compensation method, and a multi-computer switching system. The signal compensation device, the signal compensation method, and the multi-computer switching system compensate the video signal correctly and effectively to avoid over-excitation or smear. According to the invention, a signal compensation device is proposed. The signal compensation device includes a solution differential unit, a detection unit, a control unit, a filter, and an equalizer. The solution differential unit outputs a single-ended signal according to the differential signal. The detecting unit outputs a detection signal according to the single terminal signal. The control unit outputs a pulse width modulation signal according to the detection signal. The filter outputs a DC signal according to the pulse width modulation signal, and the equalizer compensates the video signal according to the DC signal. According to the present invention, a signal compensation method is proposed. The signal compensation method comprises the following steps: outputting a single-ended signal according to the differential signal; outputting the detection signal according to the single-ended signal; outputting a Pulse Width Modulation (PWM) signal according to the detection signal; and outputting the DC signal according to the PWM signal And compensating the video signal based on the DC signal.
根據本發明，提出一種多電腦切換系統，用以供一近 端控制端及一遠端控制端操控多個電腦主機。多電腦系統 包括多電腦浦器、遠端信號延長器、及近端信號延長 器。多電腦切換器係電性連接至電腦主機。 器係電性連接至遠端控制端。近端信號延長端信號延長 至多電腦切換器、遠端信號延長器及近端控電性連接 號延長器及近端信號延長器之至少一者以上°遠端信 單元、偵測單元、控制單元、濾波器及 $括解差動 ° °解差動單 201010428 元根據差動信號輸出單端信號。偵測單元根據單端信號輸 出偵測信號。控制單元根據偵測信號輸出脈波寬度調變信 號。濾波器根據脈波寬度調變信號輸出直流信號。等化器 根據直流信號補償視訊信號。近端控制端及遠端控制端各 包含鍵盤、滑鼠以及顯示裝置。等化器補償過後之視訊信 號將可以傳送至近端控制端及/或遠端控制端之顯示裝置 而顯示。 根據本發明，提出一種多電腦切換系統，用以供一控 Θ 制端操控多個電腦主機。多電腦切換系統包括矩陣式多電 腦切換器及信號延長器。矩陣式多電腦切換器係電性連接 至電腦主機。信號延長器係電性連接至控制端及矩陣式多 電腦切換器。信號延長器包括包括解差動單元、偵測單 元、控制單元、濾波器及等化器。解差動單元根據差動信 號輸出單端信號。偵測單元根據單端信號輸出偵測信號。 控制單元根據偵測信號輸出脈波寬度調變信號。濾波器根 據脈波寬度調變信號輸出直流信號。等化器根據直流信號 ❹補償視訊信號。控制端包含鍵盤、滑鼠以及顯示裝置。等 化器補償過後之視訊信號將可以傳送至控制端之顯示裝 置而顯示。 為讓本發明之上述内容能更明顯易懂，下文特舉一較 佳實施例，並配合所附圖式，作詳細說明如下： 【實施方式】 請參照第1圖，其繪示依照本發明較佳實施例的一種 7 仏號補償裝置之示意圖。信號補償裝置10包括解差動單 兀150、偵測單元11〇、控制單元12〇、濾波器13〇及等化 器140。偵測單元no電性連接於解差動單元15〇及控制 單元120之間，濾波器130電性連接於控制單元12〇及等 化器140之間。解差動單元15〇係由一纜線接收至少一差 動k號S5，且根據所接收之差動信號％輸出單端信號 S6。規線例如是無遮蔽對絞(unshielded twisted pair，υτρ) 纜線，包含CAT5/5e/6/7纜線且不僅限於此。偵測單元11〇 ®係接收解差動單元150所輸出之單端信號S6，且根據所接 收之單端彳§號S6輸出偵測信號si。控制單元120係接收 偵測單元110所輸出之偵測信號S1，且根據所接收之偵測 k號S1輸出至少一脈波寬度調變（灿记別她Modulation， PWM)仏號S2。濾波器130係接收控制單元12〇所輸出之 PWM信號S2，且根據所接收之pWM信號S2輸出直流信 號S3。等化器140係接收濾波器13〇所輸出之直流信號 S3 ’且根據所接收之直流信號S3補償視訊信號S4。等化 參器140補償後之視訊信號將可以被傳送至一顯示裝置而顯 示。其中’顯示裝置例如疋陰極射線管（Cathode Ray Tube ’ CRT)榮幕、液晶顯示面板（Liquid Crystal Display，LCD)勞幕、投影機或任何影像顯示裝置。 進一步來說’視訊信號S4包括第一影像信號、第二 影像信號及第三影像信號’而差動信號S5係為第一影像 信號、第二影像#號及第二影像信號之一與一電子信號所 組合而成。其中，電子信號例如係為8MHz的標準方波信 8 號，上述之單端信號可以是8MHz的標準方波信號在經過 一缆線傳輸至信號補償裝置10後之衰減信號。纜線例如 是無遮蔽對絞(unshielded twisted pair, UTP)缆線，包含 CAT5/5e/6/7纜線且不僅限於此。而第一影像信號、第二 影像信號及第三影像信號例如分別係為紅色（R)、綠色（G) 及藍色（B)影像信號，或是亮度（Y)、色度（U)及色差（V)影 像信號。其中，解差動單元150例如是ADA4851-2濾波器， 偵測單元110例如是8M偵測器，控制單元120例如是 β MPC82L52AT或MPC82E52微處理器。濾波器130例如是 ADA4851-2濾波器，等化器140例如是一顆EL9112或三刻 EL9110等化器’但本發明之技術並不限於此。 本發明所屬技術領域中具有通常知識者可以明瞭本 發明之技術並不侷限於此。舉例而言，解差動單元15〇係According to the present invention, a multi-computer switching system is provided for a near-end control terminal and a remote control terminal to operate a plurality of computer hosts. Multi-computer systems include multi-computers, remote signal extenders, and near-end signal extenders. The KVM switch is electrically connected to the host computer. The device is electrically connected to the remote control terminal. The signal of the proximal signal extension end is extended to at least one of the KVM switch, the remote signal extender, the near-end power connection number extender and the near-end signal extender. The remote signal unit, the detection unit, and the control unit , filter and $ differential solution ° ° solution differential single 201010428 yuan output single-ended signal according to the differential signal. The detecting unit outputs a detection signal according to the single-ended signal. The control unit outputs a pulse width modulation signal according to the detection signal. The filter outputs a DC signal according to the pulse width modulation signal. The equalizer compensates for the video signal based on the DC signal. The near-end control terminal and the remote control terminal each include a keyboard, a mouse, and a display device. The video signal after the equalizer compensation can be transmitted to the display device of the near-end control terminal and/or the remote control terminal for display. According to the present invention, a multi-computer switching system is proposed for a control terminal to operate a plurality of computer hosts. The multi-computer switching system includes a matrix type multi-switch and a signal extender. The matrix KVM switch is electrically connected to the host computer. The signal extender is electrically connected to the control terminal and the matrix type KVM switch. The signal extender includes a de-differential unit, a detecting unit, a control unit, a filter, and an equalizer. The solution differential unit outputs a single-ended signal based on the differential signal. The detecting unit outputs a detection signal according to the single-ended signal. The control unit outputs a pulse width modulation signal according to the detection signal. The filter outputs a DC signal according to the pulse width modulation signal. The equalizer compensates for the video signal based on the DC signal ❹. The console includes a keyboard, a mouse, and a display device. The video signal after the equalizer compensation can be transmitted to the display device of the control terminal for display. In order to make the above description of the present invention more comprehensible, the following description of the preferred embodiments and the accompanying drawings will be described in detail as follows: [Embodiment] Referring to Figure 1, it is shown in accordance with the present invention. A schematic diagram of a 7 apostrophe compensation device of the preferred embodiment. The signal compensating device 10 includes a de-spinning unit 150, a detecting unit 11A, a control unit 12A, a filter 13A, and an equalizer 140. The detecting unit is electrically connected between the differential unit 15 and the control unit 120. The filter 130 is electrically connected between the control unit 12 and the equalizer 140. The differential unit 15 receives at least one differential k number S5 from a cable and outputs a single-ended signal S6 based on the received differential signal %. The gauge line is, for example, an unshielded twisted pair (υτρ) cable, and includes a CAT5/5e/6/7 cable and is not limited thereto. The detecting unit 11A receives the single-ended signal S6 output from the differential unit 150, and outputs the detection signal si according to the received single-ended 彳§ S6. The control unit 120 receives the detection signal S1 outputted by the detecting unit 110, and outputs at least one pulse width modulation (Chang Ming Modulation, PWM) 仏 S2 according to the received detection k number S1. The filter 130 receives the PWM signal S2 outputted by the control unit 12, and outputs a DC signal S3 based on the received pWM signal S2. The equalizer 140 receives the DC signal S3' output from the filter 13A and compensates the video signal S4 based on the received DC signal S3. The video signal compensated by the equalizer 140 can be transmitted to a display device for display. Among them, the display device is, for example, a cathode ray tube (CRT), a liquid crystal display (LCD) screen, a projector, or any image display device. Further, the video signal S4 includes a first image signal, a second image signal, and a third image signal, and the differential signal S5 is one of the first image signal, the second image ##, and the second image signal, and an electron. The signals are combined. The electronic signal is, for example, a standard square wave signal 8 of 8 MHz. The single-ended signal may be an attenuation signal of a standard square wave signal of 8 MHz after being transmitted to the signal compensating device 10 via a cable. The cable is, for example, an unshielded twisted pair (UTP) cable, and includes a CAT5/5e/6/7 cable and is not limited thereto. The first image signal, the second image signal, and the third image signal are, for example, red (R), green (G), and blue (B) image signals, or luminance (Y), chromaticity (U), and Color difference (V) image signal. The deciphering unit 150 is, for example, an ADA4851-2 filter, the detecting unit 110 is, for example, an 8M detector, and the control unit 120 is, for example, a β MPC82L52AT or an MPC82E52 microprocessor. The filter 130 is, for example, an ADA4851-2 filter, and the equalizer 140 is, for example, an EL9112 or a three-time EL9110 equalizer', but the technique of the present invention is not limited thereto. It is obvious to those skilled in the art that the technology of the present invention is not limited thereto. For example, the differential unit 15
由一纜線接收至少一差動信號S5，差動信號％例如是G 影像彳5號與8MHz的標準方波信號所組合而成。解差動單 元150根據所接收之差動信號S5輸出單端信號邡，單端 枱號S6例如是8MHz的標準方波信號在經過一纜線傳輸至 佗號補償裝置1 〇後之衰減信號。偵測單元11 〇係接收解 差動單元150所輸出之單端信號S6，例如是⑽Hz的標準 方波信號在經過一纜線傳輸至信號補償裝置1〇後之衰減 信號，且根據所接收之單端信號S6輸出偵測信號S1至控 制單元120。 由於第一影像信號、第二影像信號及第三影像信號係 為類比信號，因此在長距離傳輸將產生信號衰減，而導致 9 201010428 信號的變形及失真。前述信號補償裝置ίο不僅能補償信 號的變形及失真，且更能正確且有效的補償視訊信號S4， 以避免產生過激現象或拖影現象。 請參照第2圖，其緣示係為控制單元120及濾波器 130之細部示意圖。前述控制單元120例如為微控制器 (Microprocessor ’ MCU)、特殊應用積體電路(Application Specific Integrated Circuit，ASIC)、複雜型可程式邏輯元 件（Complex programmable Logic Device，CPLD)、場效 ❹型可程式閘陣列（Field programmable Gates Array， FPGA )、可程式化元件或非可程式化元件，且控制單元 更包括類比數位轉換器122、PWM控制器124及儲存單元 126。類比數位轉換器122轉換偵測信號幻為數位信號sn 輸出至PWM控制器124。PWM控制器124根據數位信號 及查閱表輸出前述第i圖繪示之PWM信號S2，並調 整PWM仏號S2之工作週期（Duty Cycle)。其中，查閱表 _可儲存於儲存單元丨26，或是直接儲存於PWM控制器124 而1略儲存單元126。此外，PWM控制器124也能根據數 位信號^11及-個二次函數方程式輪出前述第i圖綠示之 PWM信號S2 ’並調整pwM信號％之工作週期。或者， PWM控制器124也能根據數位信號S11及一個多次函數方 輸出前述第i圖繪示之pwM信號S2，並調整 之工作週期”戈者，pwM控㈣124也能根據數 舌號S11及一個非線性函數方程式輸出前述第丨圏繪示 之PWM信號S2,並調整PWM信號％之工作週期。或者， 201010428 PWM控制器124也能根據數位信號S11及一個線性函數方 程式輸出前述第1圖獪示之PWM信號S2，並調整PWM 信號S2之工作週期。須要注意的是，控制單元120所執 行之功能亦可由韌體、硬體或韌體及硬體之組合而完成。 PWM信號S2包括PWM增益信號PWM-Vgain及 PWM控制信號PWM-Vcrtl。PWM控制器124根據數位信 號S11及查閱表調整PWM增益信號PWM-Vgain及PWM 控制信號PWM-Vcrtl之工作週期。其中，査閱表係記載不 β 同之數位信號S11與對應之PWM增益信號PWM-Vgain 及PWM控制信號PWM-Vcrtl的映射（Mapping)關係表。 前述濾波器130例如為低通濾波器，而前述第1圖繪 示之直流信號S3包括增益電壓Vgain及控制電壓Vcrtl。 遽波器130根據PWM增益信號PWM-Vgain輸出增益電壓 Vgain’使得等化器140根據增益電壓Vgain補償第1圖繪 示之視訊信號S4之增益，例如是補償振幅部分，避免顯 ❹不裝置所顯示之畫面產生過亮或過暗的現象。且濾波器 UO根據PWM控制信號PWM-Vcrtl輸出控制電壓Vert卜 使得等化器140根據’使得等化器14〇根據增益電壓Vgain 補償第1圖繪示之視訊信號S4之增益。補償第1圖繪示 之視訊信號S4之頻寬，例如是補償高頻部分’避免顯示 裝置所顯示之畫面產生模糊的現象。 由於前述增益及頻寬的補償方式相當於線性或非線 性的方式’較為彈性且全面性，因此不需要再以每2〇公 尺為單位對視訊信號S4進行階梯式分段補償。透過上述 201010428 揭露之信號補償裝置10將能較佳地精進至每增加一公尺 或一英呎都能對視訊信號S4做精確地補償。 請同時參照第1圖及第3圖，第3圖繪示係為依照本 發明較佳實施例的一種信號補償方法之流程圖。信號補償 方法係可應用於前述之信號補償裝置10。信號補償方法至 少包括如下步驟：首先如步驟310所示，解差動單元150 根據差動信號S5輸出單端信號S6。接著如步驟320所示， 偵測單元110根據單端信號S6輸出偵測信號S1。跟著如 Ο 步驟330所示，控制單元120根據偵測信號S1輸出PWM 信號S2。然後如步驟340所示，根據PWM信號S2輸出 直流信號S3。最後如步驟340所示，等化器140根據直流 信號S3補償視訊信號S4。 前述信號補償裝置係能設置於信號延長器中，使得信 號延長器根據信號傳輸線之長度大小適當地補償視訊信 號的增益或頻寬。後述將進一步以兩種不同的多電腦切換 系統為例說明。請參照第4圖，其繪示係為第一種多電腦 _切換系統之示意圖。多電腦切換系統40用以供一近端控 制端450及一遠端控制端430操控多個電腦主機410，多 電腦切換系統40包括多電腦切換器420、遠端信號延長器 440及近端信號延長器460。遠端控制端430及近端控制 端450例如分別包括鍵盤、滑鼠及顯示裝置。多電腦切換 器420係電性連接至電腦主機410,且遠端信號延長器440 係電性連接至遠端控制端430。近端信號延長器460係電 性連接至多電腦切換器420、遠端信號延長器440及近端 12 201010428 控制端450。前述信號補償裝置10 (如第1圖所示）係能 進一步地設置於近端信號延長器460及遠端仏號延長器 440之二者至少之一以上中，使得近端信號延長器460根 據信號傳輸線之長度正確且有效地補償視訊信號。也就是 說’遠端信號延長器440及近端信號延長器460包含信號 補償裝置10(如第1圖所示）之元件及其功能。近端控制 端450及遠端控制端430各包含鍵盤、滑鼠以及顯示裝 置。等化器補償過後之視訊信號將可以傳送至近端控制端 ❹ 450及/或遠端控制端430之顯示裝置而顯示。其中，近端 信號延長器460係分別透過一纜線與遠端信號延長器440 及多電腦切換器420電性連接，纜線例如是無遮蔽對絞親 線，包含CAT5/5e/6/7纜線且不僅限於此。 請參照第5圖，其繪示係為第二種多電腦切換系統之 示意圖。多電腦切換系統50用以供控制端530及550操 控多個電腦主機510,多電腦切換系統50包括矩陣式多電 腦切換器520、控制端530、信號延長器540、控制端55〇 ❿及信號延長器560。控制端530及控制端550例如分別包 括鍵盤、滑鼠及顯示裝置。控制端530及控制端550分別 電性連接至信號延長器540及信號延長器560，而信號延 長器540及信號延長器560分別電性連接至矩陣式多電腦 切換器520。矩陣式多電腦切換器520係電性連接至電腦 主機510。前述信號補償裝置(如第1圖所示）係能進 一步地設置於信號延長器560及信號延長器540中，使得 信號延長器56〇及信號延長器540根據信號傳輸線之長度 13 201010428 正確且有效地補償視訊信號。也就是說，信號延長器560 及信號延長器540包含信號補償裝置10 (如第1圖所示） 之凡件以及其功能。其中，信號延長器540及560分別透 過一規線與矩陣式多電腦切換器520電性連接。規線例如 是無遮蔽對絞纜線，包含CAT5/5e/6/7纜線且不僅限於此。 ❹ 鲁 請同時參照第5圖及第6圖，第6圖繪示係為第三種 多電腦切換系統之示意圖。多電腦切換系統6〇與多電腦 切換系統50不同之處在於：多電腦切換系統6〇更包括信 號延長器570，各設置於各電腦主機510及矩陣式多電腦 切換器520之間。信號延長器57〇用以將一 轉換於-差動封包及-數位形式之間，以傳== 510及矩陣式多電腦切換器52〇之間。信號延長器5川能 將矩陣式多電肋換H 520輸出之鍵歸以讀由差動封 包形式轉換為數位形式輸出至電腦主機51〇。或者，俨號 延長器570能將電腦主機510輸出之鍵盤滑鼠信由:仞 形式轉換為數位差動封包形式輸出至矩陣式多^腦 器520。或者，將電腦主機51〇輸出之視訊信號由類刀比 式轉換為差動形式輸出至矩陣式多電腦切換 一即便電腦域5H)無料多電㈣㈣ 之尨號形式不同，亦能透過信號延長器57〇適卷 ^ 達到使電腦主機510與矩陣式多電腦切換器52J轉換而 ，目的。其中’信號延長器570分別透過一規線== 多電腦切換器52G電性連接。觀例如是無 式 線，包含CAT5/5e/6/7纜線且不僅限於此。 201010428 本發明上述實施例所揭露之信號補償裝置、信號補償 方法及多電腦切換系統，係以相當於線性的方式對視訊信 號的增益及頻寬進行補償。所以，每增加一公尺都能對視 訊信號精確地補償，而不會發生拖影現象或過激現象。 綜上所述，雖然本發明已以一較佳實施例揭露如上， 然其並非用以限定本發明。本發明所屬技術領域中具有通 常知識者，在不脫離本發明之精神和範圍内，當可作各種 之更動與潤飾。因此，本發明之保護範圍當視後附之申請 ® 專利範圍所界定者為準。 參 15 201010428 【圖式簡單說明】 第1圖緣示依照本發明較佳實施例的一種信號補償 裝置之示意圖。 第2圖緣不係為控制單元12〇及濾波器ι3〇之細部示 意圖。 闽哏不你馮依照本發明較佳實施例的 補償方法之流程圖。At least one differential signal S5 is received by a cable, and the differential signal % is, for example, a combination of a G image, a 5th and an 8MHz standard square wave signal. The differential unit 150 outputs a single-ended signal 根据 according to the received differential signal S5. The single-ended station number S6 is, for example, an attenuation signal of a standard square wave signal of 8 MHz transmitted to the apostrophe compensation device 1 via a cable. The detecting unit 11 receives the single-ended signal S6 output by the de-differential unit 150, for example, an attenuation signal of a standard square wave signal of (10) Hz after being transmitted to the signal compensating device 1 through a cable, and according to the received signal The single-ended signal S6 outputs the detection signal S1 to the control unit 120. Since the first image signal, the second image signal, and the third image signal are analog signals, signal attenuation will occur during long-distance transmission, resulting in distortion and distortion of the signal of 201010428. The aforementioned signal compensation device ίο not only compensates for the distortion and distortion of the signal, but also compensates the video signal S4 correctly and effectively to avoid over-excitation or smear. Referring to Fig. 2, the schematic diagram is a detailed view of the control unit 120 and the filter 130. The control unit 120 is, for example, a microcontroller (Microprocessor ' MCU), an application specific integrated circuit (ASIC), a complex programmable logic device (CPLD), and a field effect type program. A field programmable gates Array (FPGA), a programmable component or a non-programmable component, and the control unit further includes an analog digital converter 122, a PWM controller 124, and a storage unit 126. The analog digital converter 122 converts the detection signal into a digital signal sn output to the PWM controller 124. The PWM controller 124 outputs the PWM signal S2 shown in the aforementioned i-th diagram according to the digital signal and the look-up table, and adjusts the duty cycle of the PWM signal S2 (Duty Cycle). The look-up table _ can be stored in the storage unit 丨 26, or directly stored in the PWM controller 124 and slightly stored in the unit 126. In addition, the PWM controller 124 can also rotate the PWM signal S2' shown in the aforementioned i-th image according to the digital signal ^11 and the quadratic function equation and adjust the duty cycle of the pwM signal %. Alternatively, the PWM controller 124 can also output the pwM signal S2 shown in the aforementioned i-th diagram according to the digital signal S11 and a multiple function, and adjust the duty cycle of the "PhM control (4) 124 can also be based on the number S11 and A nonlinear function equation outputs the aforementioned PWM signal S2 and adjusts the duty cycle of the PWM signal %. Alternatively, the 201010428 PWM controller 124 can also output the first image according to the digital signal S11 and a linear function equation. The PWM signal S2 is shown, and the duty cycle of the PWM signal S2 is adjusted. It should be noted that the function performed by the control unit 120 can also be implemented by firmware, hardware or a combination of firmware and hardware. The PWM signal S2 includes PWM. The gain signal PWM-Vgain and the PWM control signal PWM-Vcrtl. The PWM controller 124 adjusts the duty cycle of the PWM gain signal PWM-Vgain and the PWM control signal PWM-Vcrtl according to the digital signal S11 and the look-up table. a map of the mapping between the digital signal S11 and the corresponding PWM gain signal PWM-Vgain and the PWM control signal PWM-Vcrtl. The filter 130 is, for example, a low-pass filter. The DC signal S3 shown in Fig. 1 includes a gain voltage Vgain and a control voltage Vcrtl. The chopper 130 outputs a gain voltage Vgain' according to the PWM gain signal PWM-Vgain such that the equalizer 140 compensates according to the gain voltage Vgain. The gain of the video signal S4 is, for example, a compensation amplitude portion, to avoid the phenomenon that the picture displayed by the device is not too bright or too dark, and the filter UO outputs the control voltage Vert according to the PWM control signal PWM-Vcrtl. The controller 140 compensates the gain of the video signal S4 shown in FIG. 1 according to the gain voltage Vgain. The bandwidth of the video signal S4 shown in FIG. 1 is compensated, for example, the compensation high frequency portion is avoided. The picture displayed by the device is blurred. Since the compensation method of the gain and bandwidth is equivalent to a linear or non-linear method, it is more flexible and comprehensive, so it is not necessary to use the video signal S4 every 2 metric meters. Stepped segmentation compensation is performed. The signal compensation device 10 disclosed in the above 201010428 will be better able to refine the video message for every additional one meter or one inch. No. S4 is precisely compensated. Please refer to FIG. 1 and FIG. 3 simultaneously, and FIG. 3 is a flow chart showing a signal compensation method according to a preferred embodiment of the present invention. The signal compensation method can be applied to the foregoing. The signal compensation device 10 includes at least the following steps: First, as shown in step 310, the de-differential unit 150 outputs a single-ended signal S6 according to the differential signal S5. Then, as shown in step 320, the detecting unit 110 is based on the single-ended The signal S6 outputs the detection signal S1. Following the step 330, the control unit 120 outputs the PWM signal S2 based on the detection signal S1. Then, as shown in step 340, the DC signal S3 is output in accordance with the PWM signal S2. Finally, as shown in step 340, the equalizer 140 compensates for the video signal S4 based on the DC signal S3. The signal compensating device can be disposed in the signal extender such that the signal extender appropriately compensates the gain or bandwidth of the video signal according to the length of the signal transmission line. As will be described later, two different KVM switching systems will be taken as an example. Please refer to FIG. 4, which is a schematic diagram of the first multi-computer_switching system. The multi-computer switching system 40 is configured to provide a near-end control terminal 450 and a remote control terminal 430 to control a plurality of computer hosts 410. The multi-computer switching system 40 includes a KVM switch 420, a remote signal extender 440, and a near-end signal. Extender 460. The remote control terminal 430 and the near-end control terminal 450 include, for example, a keyboard, a mouse, and a display device, respectively. The KVM switch 420 is electrically connected to the host computer 410, and the remote signal extender 440 is electrically connected to the remote control terminal 430. The near-end signal extender 460 is electrically coupled to the KVM switch 420, the remote signal extender 440, and the near-end 12 201010428 console 450. The signal compensation device 10 (shown in FIG. 1) can be further disposed in at least one of the near-end signal extender 460 and the distal-end horn extension 440, such that the near-end signal extender 460 is The length of the signal transmission line corrects and effectively compensates for the video signal. That is, the 'remote signal extender 440 and the near-end signal extender 460 contain elements of the signal compensation device 10 (shown in Figure 1) and their functions. The near-end console 450 and the remote console 430 each include a keyboard, a mouse, and a display device. The video signal after the equalizer compensation can be transmitted to the display device of the near-end control terminal 及450 and/or the remote control terminal 430 for display. The near-end signal extender 460 is electrically connected to the remote signal extender 440 and the KVM switch 420 through a cable, for example, the unshielded twisted pair, including the CAT5/5e/6/7. The cable is not limited to this. Please refer to FIG. 5, which is a schematic diagram of a second multi-computer switching system. The multi-computer switching system 50 is used for the control terminals 530 and 550 to control a plurality of computer hosts 510. The multi-computer switching system 50 includes a matrix type KVM switch 520, a control terminal 530, a signal extender 540, a control terminal 55, and a signal. Extender 560. The control terminal 530 and the control terminal 550 include, for example, a keyboard, a mouse, and a display device, respectively. The control terminal 530 and the control terminal 550 are electrically connected to the signal extender 540 and the signal extender 560, respectively, and the signal extension 540 and the signal extender 560 are electrically connected to the matrix KVM switch 520, respectively. The matrix KVM switch 520 is electrically connected to the computer host 510. The signal compensation device (as shown in FIG. 1) can be further disposed in the signal extender 560 and the signal extender 540 such that the signal extender 56 and the signal extender 540 are correct and effective according to the length of the signal transmission line 13 201010428. Ground compensation video signal. That is, the signal extender 560 and the signal extender 540 include the components of the signal compensation device 10 (shown in Figure 1) and their functions. The signal extenders 540 and 560 are electrically connected to the matrix type KVM switch 520 through a rule line. The gauge line is, for example, an unshielded twisted pair cable, including the CAT5/5e/6/7 cable and is not limited thereto. ❹ 请 Please refer to Figure 5 and Figure 6 at the same time. Figure 6 shows a schematic diagram of the third multi-computer switching system. The multi-computer switching system 6 is different from the multi-computer switching system 50 in that the multi-computer switching system 6 further includes a signal extender 570, which is disposed between each of the computer main body 510 and the matrix type multi-computer switch 520. The signal extender 57 is used to convert a between the differential packet and the digital form to pass between == 510 and the matrix KVM switch 52A. The signal extender 5 can convert the matrix multi-electric rib to the H 520 output key to read and convert it into a digital form to the computer main unit 51〇 by the differential package form. Alternatively, the apostrophe extender 570 can output the keyboard mouse signal output from the host computer 510 to the matrix multi-branch 520 in the form of a 差 form converted into a digital differential packet. Or, the video signal outputted by the computer main unit 51 is converted from the knife-like ratio to the differential form and outputted to the matrix type multi-computer switching. Even if the computer domain 5H) has no material (4) (four), the nickname is different, and the signal extender can also be transmitted. 57〇 Applicable volume ^ achieves the purpose of converting the computer host 510 and the matrix type KVM switch 52J. The signal extender 570 is electrically connected through a rule line == KVM switch 52G. The view is, for example, a no-wire, including a CAT5/5e/6/7 cable and is not limited thereto. 201010428 The signal compensation device, the signal compensation method and the multi-computer switching system disclosed in the above embodiments of the present invention compensate the gain and bandwidth of the video signal in a linear manner. Therefore, the video signal can be accurately compensated for every additional one meter without smear or overshoot. In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is defined by the scope of the appended application ® patent. Ref. 15 201010428 [Schematic Description of the Drawings] Fig. 1 is a schematic view showing a signal compensating apparatus in accordance with a preferred embodiment of the present invention. The second figure is not intended to be a detailed description of the control unit 12A and the filter ι3. A flow chart of a compensation method in accordance with a preferred embodiment of the present invention.
第4圖緣示係為第一種多電腦切換系統之示 第5圖繪示係為第二種多電腦 ' 第6 Ιϋ猞千後a # 开示研*之不意圖 繪不係為第二種多電腦切換系 【主要元件符號說明】 仞：信號補償裝置 110 :偵測單元 120 ··控制單元 122 ·•類比數位轉換器 124 : PWM控制器 126 :儲存單元 130 :濾波器 M0 :等化器 150 :解差動單元 310〜340 :步驟 # ' 50、60 :多電腦切換系統 201010428 410、510 :電腦主機 420 :多電腦切換器 430 :遠端控制端 440 :遠端信號延長器 450 :近端控制端 460 :近端信號延長器 520 :矩陣式多電腦切換器 530、550 :控制端 〇 540、560、570 :信號延長器 51 :偵測信號 52 : PWM信號 53 :直流信號 54 :視訊信號 S11 :數位信號 PWM-Vgain : PWM 增益信號 PWM-Vcrtl : PWM 控制信號 ❿ Vgain :增益電壓The fourth picture shows the first type of multi-computer switching system. The fifth picture shows that it is the second type of multi-computer's 6th Ιϋ猞千后 a # 开示研* is not intended to be painted as the second Multi-computer switching system [Main component symbol description] 仞: Signal compensation device 110: Detection unit 120 · Control unit 122 • Analog-to-digital converter 124: PWM controller 126: Storage unit 130: Filter M0: Equalization 150: Solution differential units 310 to 340: Step # ' 50, 60: KVM switching system 201010428 410, 510: Computer host 420: KVM switch 430: Remote control terminal 440: Remote signal extender 450: Near-end control terminal 460: near-end signal extender 520: matrix type KVM switch 530, 550: control terminal 〇 540, 560, 570: signal extender 51: detection signal 52: PWM signal 53: DC signal 54: Video signal S11: Digital signal PWM-Vgain: PWM gain signal PWM-Vcrtl: PWM control signal ❿ Vgain: Gain voltage
Vcrtl :控制電壓 17Vcrtl: control voltage 17