533746 7081twf. doc/006 A7 B7 i、發明說明（/ ) 本發明是有關於一^種垣繞音效系統，且特別是有關 於一種自動偵測並設定多聲道的環繞音效系統。 目前PC產品輸出音源有2聲道系統，4聲道系統以 及5.1聲道系統等輸出規格。而2聲道系統及4聲道系統 音效效果較5.1聲道系統環繞音效來的單薄，並不能真正 滿足聆聽者聽覺上的需求，所以便有了 2聲道系統轉換成 5.1聲道環繞音效系統的推出，來滿足聆聽者聽覺上的需 求。 但目前5.1聲道環繞音效系統不是效果不佳就是操作 太過於複雜，使用者在使用相關環繞音效產品時，要依據 輸入音源做適當的音效設定非常不方便。 習知之2聲道系統轉換成5.1聲道系統環繞音效系統 之方塊示意圖’請參照第1圖。當人工操作127啓動環繞 音效電路125時，前置右聲道音源101以及前置左聲道 音源103經過環繞音效電路125處理，輸出增加了環繞 前置右聲道音效113,環繞前置左聲道音效115’環繞後 置右聲道音效117,環繞後置左聲道音效119,環繞中置 聲道音效121以及環繞重低音聲道音效123。若當輸入爲 2聲道系統時，即只有前置右聲道音源輸入101以及前置 左聲道音源輸入103,則必須經由人工操作127啓動環繞 音效電路125,再經由人工操作127設定開關電路129、 131以及133切換輸出，使前置右聲道音效輸出141爲環 繞前置右聲道音效113、前置左聲道音效輸出143爲環繞 前置左聲道音效115、後置右聲道音效輸出145爲環繞後 3 (請先閱讀背面之注咅？事項再填寫本頁) 身 訂---------線」 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS)A4規格（21ϋ x 297公釐） 533746 A7 B7 7081twf. doc/006 五、發明說明（z) 置右聲道音效117、後置左聲道音效輸出147爲環繞後置 左聲道音效119、中置聲道音效輸出149爲環繞中置聲道 音效121以及重低音聲道音效輸出151爲環繞重低音聲 道音效123，使之成爲5.1聲道環繞音效系統。若當輸入 爲4聲道系統或5.1聲道系統時，則保持原音輸出不做任 何處理。圖中緩衝器135、137以及139之功用爲減少負 載效應，讓輸出音效更加穩定。 綜合上述之意見，2聲道系統轉換成5.1聲道環繞音 效系統的處理方法尙有許多缺點，現列述如下： 1.系統無法自動判斷輸入音源爲2聲道系統或是4 聲道系統抑或是5.1聲道環繞音效系統，需由人爲判斷。 2·當輸入音源爲2聲道系統時，必須仰賴人工操作切 換輸出，無法自動切換爲5.1聲道環繞音效系統。 3·當輸入音源爲4聲道系統時，系統無法切換爲5.1. 聲道環繞音效系統。 4·傳統2聲道系統轉換成5.1聲道環繞音效系統效果 太差，無法真正滿足聆聽者的需求。 但市面上現今並無能輕易使用且能自動偵測和調整 設定使系統成爲5.1聲道環繞音效系統的環繞音效產品。 有鑒於此，本發明提出一種自動偵測並設定多聲道的環繞 音效系統’此系統包括：自動音源偵測並設定電路以及環繞 音效電路。 該自動音源偵測並設定電路，包括信號狀態偵測電 路’邏輯控制電路以及開關電路，來達成自動偵測並設定 4 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公爱） (請先閱讀背面之注咅？事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 l^i ϋ 11 Bmt 1 n Bit n ·1 - ·ϋ mmamf eMMm I mmmmmmw mma§ i·— ϋ ·1 i^i tmme I i·— ϋ 1B1 ϋ —.1 ϋ ϋ n n n n ai_— 533746 7081twf.doc/006 A7 __ B7 五、發明說明（夕） (請先閱讀背面之注意事項再填寫本頁) 多聲道的環繞音效系統。信號狀態偵測電路可以由偵測六 個輸入音源簡化成只偵測後置聲道音源以及中置聲道音 源’其中後置聲道音源信號包括後置右聲道音源信號與後 置左聲道音源信號，二者至少擇一。當環繞音效功能啓動 時’信號狀態偵測電路將輸入音源信號送往邏輯控制電 路’邏輯控制電路則判斷輸入音源信號組態後輸出切換信 號’通知開關電路切換輸出。若邏輯控制電路判斷是2聲 道組態時，便自動產生環繞前置右聲道音效、環繞前置左 聲道音效、環繞後置右聲道音效、環繞後置左聲道音效、 環繞中置聲道音效以及環繞重低音聲道音效輸出。若邏輯 控制電路判斷是4聲道組態時，便自動產生環繞中置聲道 音效以及環繞重低音聲道音效輸出，其餘輸入音源皆保持 不變’彌補輸入音源輸出音效的不足，以自動達成5.1 聲道環繞音效輸出。若是5.1聲道音源輸入時，則保持原 音輸出不做任何處理，使聆聽者能夠非常容易得到最好的 5.1聲道環繞音效效果。 該環繞音效電路，設計理論乃是依據聆聽者在音樂 廳對音場的感受，再用電路特性加以模擬。 經濟部智慧財產局員工消費合作社印製 由於音樂廳之演唱者聲音集中於中間，兩側有不同 樂器演奏，而音場強度是由正前方向四周擴散開來且音量 逐漸降低並帶有些微回音。因此該環繞音效電路系統採用 5.1聲道系統，區分爲中置喇D八（Center)，前置左聲道喇 叭和前置右聲道喇叭（Front Left & Front Right)，後置左 聲道喇叭和後置右聲道喇叭（Real Left & Real Right)以及 5 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） 533746 7 0 81twf. doc/0 06 A7 B7 五、發明說明（十） 重低音喇叭（Subwoofer)。模擬音樂廳音場將音源集中還 原於中置聲道之後再使用音源反向180°將音場拉開的原 理，將聲音音場自前置聲道和後置聲道逐漸拉開並且降低 音量，最後將重低音集中於重低音聲道如此便完成環繞音 效的效果。 綜上所述，本發明藉由一自動音源偵測並設定電路 以及環繞音效電路以達到自動設定成5.1聲道環繞音效並 且模擬成音樂廳的環繞音場效果。使聆聽者能感受到音場 的渾厚飽滿以及溫暖感。 爲讓本發明之上述和其他目的、特徵、和優點能更 明顯易懂，下文特舉較佳實施例，並配合所附圖式，作詳 細說明如下： 之簡單說明： 第1圖繪示的是習知的2聲道系統轉換成5.1聲道環 繞音效系統之流程示意圖； 第2圖繪示的是本發明的自動偵測並設定多聲道的環 繞音效系統的方塊流程示意圖。； 第3圖繪示的是本發明所使用的一種信號偵測電路示 意圖； 第4圖繪示的是本發明的環繞音效方塊示意圖； 第5A圖繪示的是第4圖中的環繞中置聲道處理器線 路方塊示意圖； 第5B圖繪示的是第4圖中的環繞前置左聲道處理器 線路方塊示意圖； 6 本紙張尺度適用中國國家標準（CNS)A4規格（21〇χ 297公釐） (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 -1· ·1 n n ϋ 1 ·1 · «_ϋ ϋ 1 i_l ϋ I n 1 i-i ϋ ϋ ·ϋ n I n ϋ n I in ϋ n n an n n _ 533746 A7 B7 7081twf.doc/006 五、發明說明（Γ) 第5C圖繪示的是第4圖中的環繞前置右聲道處理器 線路方塊示意圖； 第5D圖繪示的是第4圖中的環繞後置左聲道處理器 線路方塊示意圖； 第5Ε圖繪示的是第4圖中的環繞後置右聲道處理器 線路方塊示意圖；以及 第5F圖繪示的是第4圖中的環繞重低音聲道處理器 線路方塊示意圖。 重要元件標號= 101 :前置右聲道音源 103 :前置左聲道音源 105 :後置右聲道音源 107 :後置左聲道音源 109 :中置聲道音源 111 :重低音聲道音源 113 :環繞前置右聲道音效 115 :環繞前置左聲道音效 117 :環繞後置右聲道音效 119 :環繞後置左聲道音效 121 :環繞中置聲道音效 123 :環繞重低音聲道音效 125 :環繞音效電路 127 :人工操作 129 :開關電路 7 (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 • ϋ n -I- ϋ ϋ ϋ n 一-口、· am Β··· W Μ·· 菌 n ϋ I i I ϋ n n ϋ ϋ n I n ϋ ϋ ·ϋ I I n 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 533746 7081twf. doc/006 A7 B7 五、發明說明u ) (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製 131 :開關電路 133 :開關電路 135 :緩衝器 137 :緩衝器 139 :緩衝器 141 :前置右聲道音效 143 :前置左聲道音效 145 :後置右聲道音效 147 :後置左聲道音效 149 :中置聲道音效 151 :重低音聲道音效 201 :自動偵測並設定電路 203 :邏輯控制開關電路 205 :前置右聲道音源 207 :前置左聲道音源 209 :後置右聲道音源 211 :後置左聲道音源 213 :中置聲道音源 215 :重低音聲道音源 217 :環繞前置右聲道音效 219 :環繞前置左聲道音效 221 :環繞後置右聲道音效 223 :環繞後置左聲道音效 225 :環繞中置聲道音效 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 533746 7081twf. doc/006 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（q) 227 :環繞重低音聲道音效 229 :環繞音效電路 231 :信號狀態偵測電路 233 :邏輯控制電路 235 :開關電路 237 :開關電路 239 :開關電路 241 :緩衝器 243 :緩衝器 245 :緩衝器 247 :前置右聲道音效 249 :前置左聲道音效 251 :後置右聲道音效 253 :後置左聲道音效 255 :中置聲道音效 257 :重低音聲道音效 301 :後置聲道音源 303 :信號準位 305 :後置聲道音源信號狀態 307 :中置聲道音源 309 :信號準位 311 :中置聲道音源信號狀態 401 :環繞音效電路 403 :前置右聲道音源 (請先閱讀背面之注意事項再填寫本頁) ϋ H ϋ H ·ϋ 一： 0、a n ϋ I ϋ n ·ϋ ·ϋ I ϋ I— I ϋ n ϋ i i n n 1 n n ϋ I ϋ n n n ϋ n _ 本紙張尺度適用中國國家標準（CNS)/V1規格（2.10 X 297公釐） 533746 7081twf.doc/006 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（公） 405 :前置左聲道音源 407 :環繞前置右聲道音效 409 :環繞前置左聲道音效 411 :環繞後置右聲道音效 413 :環繞後置左聲道音效 415 :環繞中置聲道音效 417 :環繞重低音聲道音效 419 :環繞前置右聲道處理器 421 :環繞前置左聲道處理器 423 :環繞後置右聲道處理器 425 :環繞後置左聲道處理器 427 :環繞中置聲道處理器 429 :環繞重低音聲道處理器 501 :前置右聲道音源 503 :前置左聲道音源 505 :加法器 507 :放大器 509 :低通濾波器 511 :環繞中置聲道音效 513 :前置右聲道音源 515 :前置左聲道音源 517 :放大器 519 :減法器 521 :環繞前置左聲道音效 (請先閱讀背面之注意事項再填寫本頁) 訂---------線· 本紙張尺度適用中國國家標準（CNS)A4規格（210 x 297公釐） 533746 7081twf.doc/006 A7 B7 經濟部智慧財產局員工消費合作社印製 五、發明說明（1) 523 :前置右聲道音源 525 :前置左聲道音源 527 :放大器 529 :減法器 531 :環繞前置右聲道音效 533 :前置右聲道音源 535 :前置左聲道音源 537 :放大器 539 :減法器 541 :低通濾波器 543 :環繞後置左聲道音效 545 :前置右聲道音源 547 :前置左聲道音源 549 :放大器 551 :減法器 553 :低通瀘波器 555 :環繞後置右聲道音效 557 :前置右聲道音源 559 :前置左聲道音源 561 :加法器 563 :放大器 565 :低通濾波器 567 :環繞重低音聲道音效 較佳實施例 (請先閱讀背面之注意事項再填寫本頁) --------訂---------線 本紙張尺度適用中國國家標準（CNS)A4規格（2]〇χ 297公釐） 533746 7 081twf. doc/0 06 A7 B7 五、發明說明（/ 0 ) 第2圖繪示的是，自動偵測並設定多聲道的環繞音效 系統，將2聲道系統以及4聲道系統，自動切換成5.1聲 道環繞音效之方塊示意圖。 當自動偵測並設定多聲道的環繞音效系統201啓動 時，前置右聲道音源205以及前置左聲道音源207經過 一環繞音效電路229處理，輸出增加了環繞前置右聲道音 效217、環繞前置左聲道音效219、環繞後置右聲道音效 221、環繞後置左聲道音效223、環繞中置聲道音效225 以及環繞重低音聲道音效 227。然後信號狀態偵測電路 231便自動偵測後置聲道音源以及中置聲道音源213並發 射一信號組態給邏輯控制電路233,其中後置聲道音源爲 後置右聲道音源209與後置左聲道音源211，二者至少擇 一。邏輯控制電路233接收該信號組態後，判斷系統之聲 道組態後，送出一切換信號給開關電路235、237、239， 開關電路235、237、239接受到該切換信號後適當切換輸 出。若當邏輯控制電路233判斷聲道組態爲2聲道組態 時，開關電路235、237以及239便切換輸出，使前置右聲 道音效輸出247爲環繞前置右聲道音效217、前置左聲道 音效輸出249爲環繞前置左聲道音效219、後置右聲道音 效輸出251爲環繞後置右聲道音效221、後置左聲道音效 輸出253爲環繞後置左聲道音效223、中置聲道音效輸出 255爲環繞中置聲道音效225以及重低音聲道音效輸出 257爲環繞重低音聲道音效227,使之成爲5.1聲道環繞 音效系統。若當邏輯控制電路233判斷聲道組態爲4聲道 12 本紙張尺度適用中國國家標準（CNS)A:1規格〇M〇x 297公釐） (請先閱讀背面之注意事項再填寫本頁) 訂---------線—雄 經濟部智慧財產局員工消費合作社印製 經濟部智慧財產局員工消費合作社印製 533746 7081twf.doc/006 A7 —__ B7 五、發明說明（丨ρ 組態時’開關電路235、237以及239便切換輸出，使前置 右聲道音效輸出247爲前置右聲道音源輸入205、前置左 聲道音效輸出249爲前置左聲道音源輸入207、後置右聲 道音效輸出251爲後置右聲道音源輸入2〇9、後置左聲道 音效輸出253爲後置左聲道音源輸入211、中置聲道音效 輸出255爲環繞中置聲道音效225以及重低音聲道音效 輸出257爲環繞重低音聲道音效227,即增加了環繞中置 聲道音效225以及環繞重低音聲道音效227,其餘輸出皆 保持原輸入音源。若當邏輯控制電路233判斷聲道組態爲 5·1聲道組態時，開關電路便不做任何切換，皆保持原音 源輸出。圖中緩衝器 241、243以及245之功用爲減少負 載效應’議輸出音效更加穩定。 第3圖繪示的是本發明所使用的一種信號偵測電路示 意圖，請參照第3圖。上述中，當輸入音源信號301、307 大於預定信號準位303、309時，該電路便產生一個爲“Γ 的信號狀態305、311，而低於預定信號準位時，該電路 便生一個爲“0”的信號狀態305、311，其中信號狀態305、 311可爲1或0。 上述中’邏輯控制開關電路依據信號偵測電路所送 來的信號組態做出最佳化的處理。例如當環繞音效功能啓 動時，信號偵測電路便將後置聲道音源以及中置聲道音源 之信號狀態送往邏輯控制電路處理，其中後置聲道音源爲 後置右聲道音源與後置左聲道音源，二者至少擇一。當後 置聲道音源以及中置聲道之音源信號狀態都爲”0”時，邏 13 ------------，裝--------訂---------線 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS)A4規格（2.10 X 297公釐） 533746 7081twf.doc/006 A7 _B7__ 五、發明說明（/1) (請先閱讀背面之注意事項再填寫本頁) 輯控制電路便判斷爲2聲道組態，然後再透過開關電路產 生一環繞後置右聲道音效、一環繞後置左聲道音效、一環 繞中置聲道音效以及一環繞重低音聲道音效。若後置聲道 音源信號狀態爲”1”而中置聲道音源信號狀態爲”0”時，邏 輯控制電路則判斷輸入音源信號爲4聲道組態，然後再透 過開關電路產生環繞中置聲道音效以及環繞重低音聲道音 效，其餘音源皆保持原音輸出。若後置聲道音源信號狀態 和中置聲道音源信號狀態都爲”1”時，邏輯控制電路則判 斷輸入音源信號爲5.1聲道聲系統，然後將不做任何處理 保持原輸入音源輸出。如此便能讓輸出達到最佳的5.1聲 道環繞音效效果。此邏輯控制開關電路亦能使用微處理器 取代其功能。 第4圖繪示的是本發明的環繞音效方塊示意圖，請參 照第4圖。上述中，該環繞音效電路401，用以接收前置 右聲道音源403與前置左聲道音源405,並經過環繞前置 右聲道處理器419、環繞前置左聲道處理器421、環繞後 置右聲道處理器423、環繞後置左聲道處理器425、環繞 中置聲道處理器427、環繞重低音聲道處理器429,輸出 。 一環繞前置右聲道音效407、一環繞前置左聲道音效 409、一環繞後置右聲道音效411 一環繞後置左聲道音效 Ό I 413、一環繞中置聲道音效415以及一環繞重低音聲道音 ; 效 417 。 t 第5A圖繪示的是第4圖中的環繞中置聲道處理器線 ^ 路方塊示意圖，請參照第5A圖。上述中，由於一般立體 本紙張尺度適用中國國家標準（CNS)/V〗規格（210 x 297公釐） 533746 7081twf.doc/006 A7 B7 五、發明說明（/>) (請先閱讀背面之注意事項再填寫本頁) 聲之音源，將歌唱者以單音方式同時均等錄製在左聲道及 右聲道^如此才能在放音時將歌唱者之音感還原於中間。 利用此特性透過一加法器505將右聲道音源501加上左 聲道音源503，再通過一個參數爲c(1.2<=c<=1.7)的放大 器507使音量不至於太大，之後再經由頻寬爲7KHz的低 通濾波器509將較高頻的信號濾除便成爲環繞中置聲道音 效 511。 第5B圖繪示的是第4圖中的環繞前置左聲道處理器 線路方塊示意圖，請參照第5B圖。上述中，由於中置聲 道已將歌唱者音源集中，故必須將前置左聲道的音感拉開 有別於一般立體聲之音源。利用此特性將前置左聲道音源 515通過一個參數爲a(1.5<=a<=2.0)的放大器517放大，再 透過一減法器519減掉前置右聲道音源513，如此便成爲 環繞前置左聲道音效521。 經濟部智慧財產局員工消費合作社印制π 第5C圖繪示的是第4圖中的環繞前置右聲道處理器 線路方塊示意圖，請參照第5C圖。上述中，由於中置聲 道已將歌唱者音源集中，故必須將前置右聲道的音感拉開 有別於一般立體聲之音源。利用此特性將前置右聲道音源 525通過一個參數爲a(1.5<=a<=2.0)的放大器527放大，再 透過一減法器529減掉前置左聲道音源523,如此便成爲 環繞前置左聲道音效531 第5D圖繪示的是第4圖中的環繞後置左聲道處理器 線路方塊示意圖，請參照第5D圖。上述中，環繞後置左 聲道處理器處理方式和環繞前置左聲道處理器處理方式相 15 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐） 533746 7 081twf. doc/0 06 A7 B7 五、發明說明（/tf) 似，將前置左聲道音源535通過一個參數爲b(1.2<=b<=1.7) 的放大器537放大，再透過一減法器539減掉前置右聲 道音源533,然後再經過頻寬爲7KHz的低通濾波器541， 使音感拉的更寬廣些，如此便成爲環繞後置左聲道音效。 第5E圖繪示的是第4圖中的環繞後置右聲道處理器 線路方塊示意圖，請參照第5E圖。上述中，環繞後置右 聲道處理器處理方式和環繞前置右聲道處理器處理方式相 似，將前置右聲道音源545通過一個參數爲b(1.2<=b<=1.7) 的放大器549放大，再透過一減法器551減掉前置左聲 道音源547，然後再經過頻寬爲7KHz的低通濾波器553， 使音感拉的更寬廣些，如此便成爲環繞後置右聲道音效。 第5F圖繪示的是第4圖中的環繞重低音聲道處理器 線路方塊示意圖，請參照第5F圖。上述中，環繞重低音 聲道處理器處理方式和環繞中置聲道處理器處理方式相 似，先透過一加法器561將前置右聲道音源557加上前 置左聲道音源559，再通過一'個參數爲c(l.2<=c<=l.7)的 放大器563使音量不至於太大，之後再經由頻寬爲250KHz 的低通濾波器565將較高頻的信號濾除便成爲環繞重低音 聲道效567。 綜合上所述，本發明的優點如下： 1·將2聲道系統以及4聲道系統透過本發明之自動偵 測並設定多聲道的環繞音效系統處理後自動產生5.1聲道 環繞音效，並且能夠溫和地，緩緩地將音場拉開，使聆聽 者能感受到音場的飽滿感及溫暖感而不會有壓迫感，宛如 16 本紙張尺度適用中國國家標準（CNS)A4規格⑵〇 X 297公釐） (請先閱讀背面之注意事項再填寫本頁) 經濟部智慧財產局員工消費合作社印製533746 7081twf. Doc / 006 A7 B7 i. Description of the invention (/) The present invention relates to a surround sound effect system, and particularly to a surround sound effect system that automatically detects and sets multiple channels. At present, the output sources of PC products include 2-channel system, 4-channel system and 5.1-channel system. The sound effects of the 2-channel system and 4-channel system are thinner than the surround sound of the 5.1-channel system, which cannot really meet the auditory needs of the listener. Therefore, the 2-channel system is converted into a 5.1-channel surround sound system. Launched to meet the auditory needs of listeners. However, the current 5.1-channel surround sound system is either ineffective or too complicated to operate. When using related surround sound products, it is very inconvenient for users to make appropriate sound settings based on the input source. Please refer to Figure 1 for a block diagram of a conventional 2-channel system converted into a 5.1-channel surround sound system. When the surround sound circuit 125 is activated by the manual operation 127, the front right channel sound source 101 and the front left channel sound source 103 are processed by the surround sound circuit 125, and the surround front right channel sound effect 113 and the front left sound are added to the output. Channel sound 115 'surround back right channel sound 117, surround back left channel sound 119, surround center channel sound 121 and surround subwoofer sound 123. If the input is a 2-channel system, that is, only the front right channel sound source input 101 and the front left channel sound source input 103, the surround sound circuit 125 must be started by manual operation 127, and the switch circuit is set by manual operation 127 129, 131, and 133 switch the output so that the front right channel sound output 141 is surround front right channel sound effect 113, the front left channel sound output 143 is surround front left channel sound effect 115, and rear right channel The sound output is 145 after the surround 3 (please read the note on the back? Matters before filling out this page). Customization --------- Line "Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, Consumer Consumption Cooperative Paper Size Applicable to China National Standard (CNS) A4 specification (21ϋ x 297 mm) 533746 A7 B7 7081twf.doc / 006 V. Description of the invention (z) Set the right channel sound 117 and the rear left channel sound output 147 to surround the rear left sound Channel sound effect 119, center channel sound output 149 are surround center channel sound effect 121 and subwoofer sound output 151 is surround sub channel sound effect 123, making it a 5.1 channel surround sound system. If the input is a 4-channel system or a 5.1-channel system, the original sound output is left unprocessed. The functions of the buffers 135, 137, and 139 in the figure are to reduce the load effect and make the output sound more stable. Based on the above opinions, the processing method for converting a 2-channel system into a 5.1-channel surround sound system has many disadvantages, which are listed below: 1. The system cannot automatically determine whether the input source is a 2-channel system or a 4-channel system or It is a 5.1-channel surround sound system that requires human judgment. 2. When the input sound source is a 2-channel system, you must rely on manual operation to switch the output, and you cannot automatically switch to a 5.1-channel surround sound system. 3. When the input source is a 4-channel system, the system cannot be switched to a 5.1. Channel surround sound system. 4. The conversion from a traditional 2-channel system to a 5.1-channel surround sound system is too poor to truly meet the needs of the listener. However, there are currently no surround sound products on the market that can be easily used and can automatically detect and adjust settings to make the system a 5.1-channel surround sound system. In view of this, the present invention proposes a surround sound effect system for automatically detecting and setting multiple channels. The system includes: an automatic sound source detection and setting circuit and a surround sound effect circuit. The automatic sound source detection and setting circuit includes a signal state detection circuit, a logic control circuit, and a switching circuit to achieve automatic detection and setting. 4 paper sizes are applicable to China National Standard (CNS) A4 specifications (210 X 297 public love) (Please read the note on the back? Matters before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy l ^ i ϋ 11 Bmt 1 n Bit n · 1-· ϋ mmamf eMMm I mmmmmmw mma§ i · — ϋ · 1 i ^ i tmme I i · — ϋ 1B1 ϋ —.1 ϋ ϋ nnnn ai_— 533746 7081twf.doc / 006 A7 __ B7 V. Description of the invention (Even) (Please read the precautions on the back before filling this page) Multi-channel surround sound system. The signal state detection circuit can be simplified from detecting six input sound sources to detecting only the rear channel sound source and the center channel sound source. The rear channel sound source signal includes the rear right channel sound source signal and the rear left sound source. Audio source signal, choose at least one of the two. When the surround sound function is activated, the 'signal state detection circuit sends the input sound source signal to the logic control circuit' and the logic control circuit judges that the input sound source signal is configured and outputs a switching signal 'to notify the switch circuit to switch the output. If the logic control circuit determines that it is a 2-channel configuration, it will automatically generate surround front right channel sound, surround front left channel sound, surround back right channel sound, surround back left channel sound, and surround. Set channel sound effects and surround subwoofer sound output. If the logic control circuit determines that it is a 4-channel configuration, it will automatically generate surround center channel sound effects and surround subwoofer channel sound output, and the remaining input sound sources will remain unchanged. 5.1 channel surround sound output. If it is a 5.1-channel audio input, the original sound output is left unprocessed, so that the listener can easily obtain the best 5.1-channel surround sound effect. The design theory of this surround sound effect circuit is based on the listener's perception of the sound field in the concert hall, and then the circuit characteristics are used to simulate it. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs because the singer's voice in the concert hall is concentrated in the middle, with different instruments playing on both sides, and the sound field intensity is diffused from the front direction and the volume gradually decreases with some echo . Therefore, the surround sound circuit system adopts a 5.1-channel system, which is divided into a center D8 (Center), a front left channel speaker and a front left channel speaker (Front Left & amp Right), and a rear left channel. Speaker and rear right channel speaker (Real Left & Real Right) and 5 paper sizes are applicable to China National Standard (CNS) A4 (210 x 297 mm) 533746 7 0 81twf. Doc / 0 06 A7 B7 V. Description of the invention (ten) Subwoofer. The principle of simulating the sound field of a concert hall is to restore the sound source to the center channel and then use the sound source to reverse 180 ° to pull the sound field apart. The sound field is gradually pulled away from the front and rear channels and the volume is reduced. , And finally focus the subwoofer on the subwoofer channel to complete the surround sound effect. In summary, the present invention uses an automatic sound source detection and setting circuit and a surround sound effect circuit to achieve an automatic 5.1-channel surround sound effect and simulate the surround sound field effect of a concert hall. The listener can feel the fullness and warmth of the sound field. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments in detail with the accompanying drawings, as follows: Brief description: It is a schematic flow chart of converting a conventional 2-channel system into a 5.1-channel surround sound system. FIG. 2 illustrates a block flow diagram of the present invention for automatically detecting and setting a multi-channel surround sound system. Figure 3 shows a schematic diagram of a signal detection circuit used in the present invention; Figure 4 shows a schematic block diagram of the surround sound effect of the present invention; Figure 5A shows the surround center in Figure 4 Schematic diagram of the channel processor circuit block; Figure 5B shows the schematic diagram of the surround front left channel processor circuit block in Figure 4; 6 This paper size applies to the Chinese National Standard (CNS) A4 specification (21〇χ 297 Mm) (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-1 · · 1 nn ϋ 1 · 1 · «_ϋ ϋ 1 i_l ϋ I n 1 ii ϋ ϋ · ϋ n I n ϋ n I in ϋ nn an nn _ 533746 A7 B7 7081twf.doc / 006 V. Description of the invention (Γ) Figure 5C shows the surround front right channel processor circuit block in Figure 4. Figure 5D shows a schematic block diagram of the surround back left channel processor circuit in Figure 4; Figure 5E shows a schematic block diagram of the surround back right channel processor circuit in Figure 4; And Figure 5F shows the circuit of the surround subwoofer processor in Figure 4. FIG. Key component numbers = 101: front right channel sound source 103: front left channel sound source 105: rear right channel sound source 107: rear left channel sound source 109: center channel sound source 111: subwoofer sound source 113: Surround front right channel sound 115: Surround front left channel sound 117: Surround back right channel sound 119: Surround back left channel sound 121: Surround center channel sound 123: Surround subwoofer sound Road sound effect 125: Surround sound effect circuit 127: Manual operation 129: Switch circuit 7 (Please read the precautions on the back before filling this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs • ϋ n -I- ϋ ϋ ϋ n 1 -Mouth, · am Β ··· W Μ ·· bacteria n ϋ I i I ϋ nn ϋ I n I n ϋ ϋ · ϋ II n This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ) 533746 7081twf. Doc / 006 A7 B7 V. Description of the invention u) (Please read the notes on the back before filling this page) Printed by the Intellectual Property Bureau Staff Consumer Cooperatives 131: Switch Circuit 133: Switch Circuit 135: Buffer 137: Buffer 139: Buffer 141: Front right channel sound 143: Front Left channel sound effect 145: Rear right channel sound effect 147: Rear left channel sound effect 149: Center channel sound effect 151: Subwoofer sound effect 201: Automatic detection and setting circuit 203: Logic control switch circuit 205: Front right channel audio source 207: front left channel audio source 209: rear right channel audio source 211: rear left channel audio source 213: center channel audio source 215: subwoofer channel audio source 217: surround front right Channel sound effect 219: Front left channel sound effect 221: Surround back right channel sound effect 223: Surround back left channel sound effect 225: Surround center channel sound effect This paper standard applies to China National Standard (CNS) A4 specifications (210 X 297 mm) 533746 7081twf. Doc / 006 A7 B7 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (q) 227: Surround subwoofer sound 229: Surround sound effect circuit 231: Signal status detection Test circuit 233: logic control circuit 235: switch circuit 237: switch circuit 239: switch circuit 241: buffer 243: buffer 245: buffer 247: front right channel sound effect 249: front left channel sound effect 251: rear Set right channel sound 253: Rear left channel Effect 255: Center channel sound 257: Subwoofer sound 301: Rear channel sound source 303: Signal level 305: Rear channel sound source Signal status 307: Center channel sound source 309: Signal level 311: Center channel sound source signal status 401: Surround sound circuit 403: Front right channel sound source (please read the precautions on the back before filling this page) ϋ H ϋ H · ϋ 1: 0, an ϋ I ϋ n · ϋ · Ϋ I ϋ I— I ϋ n ϋ iinn 1 nn ϋ I ϋ nnn ϋ n _ This paper size applies to China National Standard (CNS) / V1 (2.10 X 297 mm) 533746 7081twf.doc / 006 A7 B7 Ministry of Economy Printed by the Intellectual Property Bureau's Consumer Cooperatives 5. Invention Description (public) 405: front left channel sound source 407: surround front right channel sound 409: surround front left channel sound 411: surround back right channel sound 413: surround back left channel sound 415: surround center channel sound 417: surround subwoofer sound 419: surround front right channel processor 421: surround front left channel processor 423: surround back Right channel processor 425: Surround rear left channel processor 427: Surround center channel 429: Surround subwoofer processor 501: Front right channel audio source 503: Front left channel audio source 505: Adder 507: Amplifier 509: Low pass filter 511: Surround center channel sound effect 513: Front Set right channel audio source 515: front left channel audio source 517: amplifier 519: subtracter 521: surround front left channel audio effect (please read the precautions on the back before filling this page) Order ------- --Line · This paper size applies to Chinese National Standard (CNS) A4 (210 x 297 mm) 533746 7081twf.doc / 006 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (1) 523: Front right audio source 525: Front left audio source 527: Amplifier 529: Subtractor 531: Surround front right audio source 533: Front right audio source 535: Front left audio source 537: Amplifier 539 : Subtractor 541: Low-pass filter 543: Surround back left channel sound 545: Front right channel sound source 547: Front left channel sound source 549: Amplifier 551: Subtractor 553: Low-pass chirper 555: Surround back right channel sound 557: front right channel sound source 559: front left channel sound source 561: plus 563: Amplifier 565: Low-pass filter 567: Surround subwoofer sound preferred embodiment (please read the precautions on the back before filling this page) -------- Order ------ --- The paper size of the paper is in accordance with the Chinese National Standard (CNS) A4 specification (2) 0 297 mm) 533746 7 081twf. Doc / 0 06 A7 B7 V. Description of the invention (/ 0) The second figure shows , Automatically detect and set the multi-channel surround sound system, automatically switch the 2-channel system and 4-channel system to 5.1-channel surround sound. When the multi-channel surround sound system 201 is automatically detected and set, the front right channel sound source 205 and the front left channel sound source 207 are processed by a surround sound circuit 229, and the output adds surround front right sound 217, surround front left channel sound 219, surround back right channel sound 221, surround back left channel sound 223, surround center channel sound 225, and surround subwoofer sound 227. Then the signal state detection circuit 231 automatically detects the rear channel sound source and the center channel sound source 213 and transmits a signal to the logic control circuit 233. The rear channel sound source is the rear right channel sound source 209 and Rear left channel sound source 211, at least one of which is selected. After receiving the signal configuration, the logic control circuit 233 judges the sound channel configuration of the system and sends a switching signal to the switching circuits 235, 237, and 239. The switching circuits 235, 237, and 239 appropriately switch the output after receiving the switching signal. If the logic control circuit 233 determines that the channel configuration is a 2-channel configuration, the switching circuits 235, 237, and 239 switch the output so that the front right channel sound output 247 is surround front right channel sound effect 217, front Set left channel sound output 249 to surround front left channel sound effect 219, rear right channel sound output 251 to surround back right channel sound effect 221, rear left channel sound output 253 to surround back left channel Sound effect 223, center channel sound output 255 is surround center channel sound effect 225 and subwoofer sound output 257 is surround subwoofer sound effect 227, making it a 5.1 channel surround sound system. If the logic control circuit 233 judges that the channel configuration is 4 channels 12 This paper size is applicable to Chinese National Standard (CNS) A: 1 specifications 0M〇x 297 mm) (Please read the precautions on the back before filling this page ) Order --------- Line—Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs and printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs and printed by 533746 7081twf.doc / 006 A7 —__ B7 ρ During configuration, the switch circuits 235, 237, and 239 switch the output so that the front right channel sound output 247 is the front right channel sound input 205, and the front left channel sound output 249 is the front left channel sound source Input 207, rear right channel audio output 251 is rear right channel audio input 209, rear left channel audio output 253 is rear left channel audio input 211, center channel audio output 255 is surround The center channel sound effect 225 and the subwoofer channel sound output 257 are the surround subwoofer channel sound effect 227, that is, the surround center channel sound effect 225 and the surround subwoofer channel sound effect 227 are added, and the other outputs are maintained as the original input sound source. If the logic control circuit 233 determines the channel configuration In the 5.1 channel configuration, the switching circuit does not perform any switching and maintains the original sound source output. The functions of the buffers 241, 243, and 245 in the figure are to reduce the load effect. The output sound effect is more stable. Figure 3 shows This is a schematic diagram of a signal detection circuit used in the present invention, please refer to Figure 3. In the above, when the input sound source signals 301, 307 are greater than the predetermined signal levels 303, 309, the circuit will generate a signal of "Γ State 305, 311, and when the signal level is lower than the predetermined signal level, the circuit generates a signal state 305, 311 of "0", wherein the signal states 305, 311 can be 1 or 0. In the above, the logic control switch circuit is based on The signal configuration sent by the signal detection circuit is optimized for processing. For example, when the surround sound function is activated, the signal detection circuit sends the signal status of the rear channel sound source and the center channel sound source to the logic The control circuit processes the rear channel sound source as the rear right channel sound source and the rear left channel sound source, at least one of which is selected. When the signal status of the rear channel sound source and the center channel sound source is "0" " , Logic 13 ------------, install -------- order --------- line (please read the precautions on the back before filling this page) Paper size applies Chinese National Standard (CNS) A4 specification (2.10 X 297 mm) 533746 7081twf.doc / 006 A7 _B7__ V. Description of the invention (/ 1) (Please read the precautions on the back before filling this page) Edit control circuit It is determined to be a 2-channel configuration, and then a surround back right channel sound effect, a surround back left channel sound effect, a surround center channel sound effect, and a surround subwoofer sound effect are generated through the switch circuit. If the state of the rear channel sound source signal is "1" and the state of the center channel sound source signal is "0", the logic control circuit determines that the input sound source signal is in a 4-channel configuration, and then generates a surround center through the switch circuit. Channel sound effects and surround subwoofer sound effects, the remaining audio sources will remain the original sound output. If both the rear channel sound source signal state and the middle channel sound source signal state are "1", the logic control circuit determines that the input sound source signal is a 5.1 channel sound system, and then does nothing to maintain the original input sound source output. This will give the best 5.1-channel surround sound output. This logic controlled switching circuit can also use a microprocessor to replace its function. Figure 4 shows a block diagram of the surround sound effect of the present invention, please refer to Figure 4. In the above, the surround sound circuit 401 is configured to receive the front right channel sound source 403 and the front left channel sound source 405, and pass through the surround front right channel processor 419, the surround front left channel processor 421, The surround back right channel processor 423, the surround back left channel processor 425, the surround center channel processor 427, and the surround subwoofer channel processor 429 output. A surround front right channel sound 407, a surround front left channel sound 409, a surround back right channel sound 411, a surround back left channel sound Ό I 413, a surround center channel sound 415, and A surround subwoofer sound; effect 417. t Figure 5A shows the block diagram of the surround center channel processor cable in Figure 4; please refer to Figure 5A. Among the above, as the general three-dimensional paper size applies to the Chinese National Standard (CNS) / V〗 (210 x 297 mm) 533746 7081twf.doc / 006 A7 B7 V. Description of the Invention (/ >) (Please read the back Please fill in this page again), the sound source of the sound, the singer will be recorded in the left channel and the right channel at the same time in a single tone ^ so that the voice of the singer can be restored in the middle during playback. Use this feature to add the right channel sound source 501 to the left channel sound source 503 through an adder 505, and then use an amplifier 507 with a parameter c (1.2 < = c < = 1.7) to make the volume not too loud. The higher frequency signal is filtered through a low-pass filter 509 with a bandwidth of 7KHz to become a surround center channel sound effect 511. Figure 5B is a schematic diagram of the circuit block of the surround front left channel processor in Figure 4, please refer to Figure 5B. In the above, because the center channel has concentrated the singer's sound source, the front left channel must be separated from the sound source of ordinary stereo sound. Using this feature, the front left channel sound source 515 is amplified by an amplifier 517 having a parameter a (1.5 < = a < = 2.0), and then the front right channel sound source 513 is subtracted by a subtractor 519, so that it becomes Surround front left channel sound 521. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs π Figure 5C shows the schematic diagram of the circuit block of the front right channel processor in Figure 4, please refer to Figure 5C. In the above, since the center sound channel has concentrated the singer's sound source, the sound of the front right channel must be pulled apart from the ordinary stereo sound source. Use this feature to amplify the front right channel source 525 through an amplifier 527 with parameter a (1.5 < = a < = 2.0), and then subtract the front left channel source 523 through a subtractor 529, so that it becomes Surround front left channel sound effect 531 Figure 5D shows a schematic block diagram of the surround back left channel processor circuit in Figure 4, please refer to Figure 5D. In the above, the processing method of the surround back left channel processor and the surround front left channel processor are similar. 15 This paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 533746 7 081twf. Doc / 0 06 A7 B7 V. Invention description (/ tf) Similarly, the front left channel sound source 535 is amplified by an amplifier 537 with a parameter b (1.2 < = b < = 1.7), and then subtracted by a subtractor 539. Turn off the front right channel sound source 533, and then pass the low-pass filter 541 with a bandwidth of 7KHz to make the sound wider, so that it becomes the surround left channel sound effect. Figure 5E shows a schematic block diagram of the surround back right channel processor in Figure 4. Please refer to Figure 5E. In the above, the processing method of the surround back right channel processor is similar to that of the surround front right channel processor. The front right channel sound source 545 is passed a parameter b (1.2 < = b < = 1.7). The amplifier 549 is amplified, and then the front left channel sound source 547 is subtracted by a subtractor 551, and then the low-pass filter 553 with a bandwidth of 7KHz is used to make the sound wider, so it becomes the surround back right sound. Road sound effects. Figure 5F shows the block diagram of the surround subwoofer processor circuit in Figure 4. Please refer to Figure 5F. In the above, the processing method of the surround subwoofer processor is similar to that of the surround center channel processor. First, the front right channel source 557 is added to the front left channel source 559 through an adder 561, and then An amplifier 563 with a parameter of c (l.2 < = c < = l.7) keeps the volume from being too loud, and then filters the higher-frequency signal through a low-pass filter 565 with a bandwidth of 250KHz It becomes the surround subwoofer channel effect 567. To sum up, the advantages of the present invention are as follows: 1. The 2-channel system and the 4-channel system are automatically detected by the present invention and the multi-channel surround sound system is processed to automatically generate a 5.1-channel surround sound effect, and It can gently and slowly pull the sound field apart, so that listeners can feel the fullness and warmth of the sound field without feeling oppressive, as if the 16 paper standards are applicable to the Chinese National Standard (CNS) A4 specification⑵〇 X 297 mm) (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs
533746 7081twf.doc/006 五、發明說明（ 置身在音樂廳聆聽音樂，和直接將輸入音源複製成多聲道 音效產生很強的壓迫感有很大的差異。 2.當環繞音效系統功能啓動時，系統便會自動偵測其 輸入音源。若是2聲道系統以及4聲道系統便自動產生5丄 聲道環繞音效，若是5.1聲道系統則保持原輸入音源輸出_， 不做任何處理。如此一來便可使聆聽者不用判斷聲道組能 及設定就可輕易的達到5_1聲道環繞音效效果。 雖然本發明已以較佳實施例揭露如上，然其並 以限定本發明，任何熟習此技藝者，在不脫離本發明之^ 神和範圍內，當可作各種之更動與潤飾，因此本發明之S 護範圍當視後附之申請專利範圍所界定者爲準。 (請先閱讀背面之注咅？事項再填寫本頁} ---I I I--訂----- . 經濟部智慧財產局員工消費合作社印製 格 ί規 4 A S) N (C 準 標 '97533746 7081twf.doc / 006 V. Description of the invention (Listening to music in a concert hall, and copying the input source directly into a multi-channel sound effect have a very strong sense of oppression. 2. When the surround sound system function is activated , The system will automatically detect its input sound source. If it is a 2-channel system and a 4-channel system, it will automatically generate a 5-channel surround sound effect, if it is a 5.1-channel system, it will keep the original input source output_ without any processing. In this way, the listener can easily achieve the 5_1-channel surround sound effect without judging the channel set ability and setting. Although the present invention has been disclosed as above with a preferred embodiment, it also limits the present invention, anyone familiar with this Artists, without departing from the spirit and scope of the present invention, can make various modifications and retouches. Therefore, the S protection scope of the present invention shall be determined by the scope of the attached patent application. (Please read the back first Remarks? Please fill out this page again. --- II I--Order -----. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy 4 AS) N (C Standard '97