專利名稱：電子琴電路的制作方法
技術(shù)領(lǐng)域：
本發(fā)明是一種電子琴電路。
電子琴電路種類繁多，但原理大致雷同?，F(xiàn)有各種電子琴，存在著音色不夠完美、各種管弦器樂聲模擬不夠逼真的缺點。此外，音響頻寬不夠、采用軟件太復(fù)雜、高頻諧波失真等，亦系現(xiàn)有技術(shù)中所存在之問題。
針對以上不足之處，本發(fā)明的目的是研制一種新的電子琴電路，這種電路采用較簡單的軟件，即可達(dá)到音色和諧、樂聲模擬逼真的目的。
本發(fā)明所述電路包括六個集成塊U1-U6。其中U1是微型電腦，U2是高頻控制信號發(fā)生器，U3為數(shù)模轉(zhuǎn)換器，U4是隔離放大器，U5為時鐘脈沖發(fā)生器，U6是雙聲道功率放大器。當(dāng)電源開啟后，時鐘脈沖發(fā)生器U5即產(chǎn)生3.579兆赫的時鐘脈沖訊號，該訊號分別經(jīng)兩級及一級反相器而輸入微型電腦U1和調(diào)頻控制信號發(fā)生器U2。微型電腦在時鐘脈沖信號及其中軟件的操縱下，對琴鍵和/或功能鍵進(jìn)行掃描，送出某一(或某些)鍵已被按下信息，送入調(diào)頻控制信號發(fā)生器內(nèi)。調(diào)頻控制信號發(fā)生器產(chǎn)生相對應(yīng)的數(shù)碼音頻信號，經(jīng)數(shù)模轉(zhuǎn)換器轉(zhuǎn)換成模擬音頻信號，然后送入隔離放大器，把輸入端與輸出端隔離開，以達(dá)最佳負(fù)荷匹配之目的。由隔離放大器輸出的信號復(fù)入每邊的雙聲道功率放大器進(jìn)行功率放大后，被送至揚(yáng)聲器。
本發(fā)明采用了特殊設(shè)計的微型電腦集成塊U1，配以一種新型簡單的數(shù)碼控制程序，而達(dá)到音質(zhì)優(yōu)美、音色和諧、器樂聲模擬逼真的目的。
本發(fā)明中的集成塊U1(附

圖1)是一個單芯片64腳微型電腦。它內(nèi)藏一個中央處理器(CPU)，只讀存儲器(EPROM)，隨機(jī)存取存儲器(RAM)、累加器、輸入/輸出端口、電源開啟歸零線路以及串接介面等。存儲器中的只讀存儲器(EPROM)為8192×8位元;隨機(jī)存取存儲器(RAM)為512×4位元;位元復(fù)制記憶為16位元;此外還具有四個8×4位元的一般用途儲存庫。累加器有位元累加器(CY)、4位元累加器(A)和8位元累加器(XA)三種。輸入/輸出端口包括高電流(200毫安)輸出端口(32只腳)，可直接推動諸發(fā)光二極管;以及12條N-溝通(漏極開路)。串連介面為8位元串連介面，數(shù)據(jù)傳輸可由LSB或MSB開始，它具有兩個切換選擇(傳送/接收)。本集成塊的腳與腳間距離為1.78毫米，它能產(chǎn)生46種指令，并能產(chǎn)生位元復(fù)制指令、8位元數(shù)據(jù)的傳輸、比較、加/減指令，1位組相連分支指令，其中1位組指令能完成2-3位組指令功能。指令周期分兩種高速度周期(0.95微秒/4.19兆赫)以及低伏特周期(1.91微秒/4.19兆赫，或15.3微秒/4.19兆赫)微型電腦中使用的數(shù)碼控制程序，附在說明書之后。
集成塊U2(附圖2)是調(diào)頻控制信號發(fā)生器，在數(shù)碼程序控制下，產(chǎn)生一系列可變化的寬頻音響，并具備產(chǎn)生音樂節(jié)奏功能。由于它內(nèi)藏一個低頻振蕩器，用于產(chǎn)生聲音振動并調(diào)幅效應(yīng)，故在產(chǎn)生特別音響效果時，可減少軟件的復(fù)雜性。由于該集成塊是數(shù)碼輸出的，故在其輸出端設(shè)有數(shù)碼轉(zhuǎn)換塊。本集成塊能產(chǎn)生較寬可變的調(diào)頻音響，并內(nèi)藏振動產(chǎn)生器及調(diào)幅器，能配合TTL輸入/輸出。集成塊由5伏單電源供電。
集成塊U3(附圖3)是浮動串連輸入數(shù)碼/線性模擬信號轉(zhuǎn)換器，它能把一系列數(shù)碼輸入轉(zhuǎn)換成線性模擬信號而輸出(具有16位元的動態(tài)量程)。該集成塊能減少一般噪音及高頻諧波失真，在不同氣溫下具有穩(wěn)定工作點的性能。
集成塊U4(附圖4)為一個二運(yùn)算放大器的8腳集成塊，第8腳和第4腳分別接正和負(fù)電源(VDD及VSS)。它通過二運(yùn)放深度負(fù)反饋來提高輸入阻抗，降低輸出阻抗，起到隔離輸入端和輸出端的作用。
集成塊U5為時鐘脈沖發(fā)生器，是一個晶體振蕩器，它是一個14腳的集成塊，經(jīng)由內(nèi)藏的反相器而分別將信號送至微型電腦集成塊U1，和調(diào)頻控制信號發(fā)生器U2。
集成塊U6為一雙聲道功率放大器，放大器每邊功率為2.5瓦，電源為9伏，接4歐姆揚(yáng)聲器。其中第1腳和第10腳分別接負(fù)和正電源。
附圖5是整個電路的系統(tǒng)方塊圖。
附圖6是本發(fā)明之最佳實施例。
附圖2集成塊U2的各出腳說明IRQ輸入請求IC內(nèi)部聯(lián)接AO放大器輸出端WR·RD控制線CS通道狀態(tài)φSy同步SH存貯操作采樣保持Nc不連接Dφ-D7八位數(shù)據(jù)線附圖3集成塊U3的出腳說明VDD電源LoAD置數(shù)ToBUFF至緩沖SD抽樣延遲φ1(clock)時鐘RB反向讀出MP維修程序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權(quán)利要求
1.一種電子琴電路，包括調(diào)頻控制信號發(fā)生器，數(shù)模轉(zhuǎn)換器，隔離放大器，時鐘脈沖發(fā)生器和雙聲道功率放大器，其特征在于使用一種64個腳的微型電腦。
2.按權(quán)利要求1所述的電子琴電路，其特征在于所用微型電腦的腳間距為1.78毫米。
3.按權(quán)利要求1或2所述的電子琴的微型電腦，其特征在于采用一種新型、簡單的數(shù)碼控制程序。
4.按權(quán)利要求1所述的電子琴電路，其特征在于調(diào)頻控制信號發(fā)生器中內(nèi)藏一個用于產(chǎn)生音頻響應(yīng)增寬的低頻振蕩器。
全文摘要
本發(fā)明為一種電子琴電路，其中包括微型電腦、調(diào)頻控制信號發(fā)生器、數(shù)模轉(zhuǎn)換器、隔離放大器、時鐘脈沖發(fā)生器和雙聲道功率放大器，并采用一種新型簡單的數(shù)碼控制程序，以達(dá)到音色和諧，樂音模擬更加逼真之目的。
文檔編號G10H1/00GK1032254SQ8710650
公開日1989年4月5日 申請日期1987年9月25日 優(yōu)先權(quán)日1987年9月25日
發(fā)明者原蜀育, 鄧開權(quán) 申請人:中國康華實業(yè)公司南方分公司深圳支公司