音視頻及家電
電子發(fā)燒友網(wǎng)本頻道提供專業(yè)的視頻技術(shù)文章和音響技術(shù)應用資料等;是值得收藏和分享的視頻技術(shù)與音頻技術(shù)欄目。
Sawtooth Generator Exhibits ~1
Abstract: Two integrated circuits (ICs) and some associated components form a voltage-controlled sawtooth generator that costs less than $3 and produces an auxiliary square wave at the same frequency. The generator is useful in a varie...
2009-05-07 標簽：Frequency 1275
Circuit Drives Mixed Types and
Portable systems often use LEDs of different colors-white for the display backlight, green for keypad illumination, red for power, etc., and in varying quantities of each. Typically the LEDs are driven by at least two power supplies, one f...
2009-05-07 標簽：led 955
順序啟動CCFL顯示器的突發(fā)亮度調(diào)節(jié)
摘要：為了降低對直流逆變器瞬間電流的需求，DS3984/DS3988冷陰極熒光燈控制器采用順序啟動突發(fā)亮度調(diào)節(jié)的方式，控制LCD顯示器的每個通道。 圖1給出了DS3984/DS3988冷陰...
2009-05-07 標簽：顯示器 1031
單晶體管降低噪音的LDO的46分貝-Single Trans
Abstract: A simple RC filter with an external transistor driver rejects LDO noise. A plot of noise density vs. frequency shows that the filter rejects LDO noise by more than 46dB, and achieves a noise floor of 7nV/...
2009-05-07 標簽：ldo 1447
Ultra-Low-Noise LDO Achieves 6
Abstract: This ultra-low-noise LDO combines low-noise components with filtering to achieve an output noise performance of 6nV/ at 1kHz. Of the many low-dropout (LDO)...
2009-05-07 標簽：ldo 1877
Class D Audio Amplifier Output
Abstract: This application note examines the effect of the output filter on audio Class D amplifier performance. Switch-mode amplifiers such as the MAX4295 and MAX4297 offer improved efficiency over their more traditional Class AB counterp...
2009-05-06 標簽：audio 1919
音/視頻應用中利用負壓電荷泵和模擬開關(guān)構(gòu)建DirectDri
摘要：MAX9503/MAX9505 DirectDrive™視頻濾波放大器集成了模擬開關(guān)(MAX9505)和負壓電荷泵，可有效提高音/視頻應用的性能。 引言MAX9503/MAX9505 DirectDrive視頻濾波放大...
2009-05-06 標簽： 942
下一代視頻濾波放大器，延長了手持式視頻系統(tǒng)的電池使用時間
摘要：越來越多的便攜式設備，例如數(shù)碼相機、蜂窩電話和便攜式媒體播放器等，都開始逐漸增加復合視頻輸出的連接功能。這類設備中，視頻數(shù)/模轉(zhuǎn)換器(DAC)產(chǎn)生復合視頻信號，...
2009-05-06 標簽：視頻 650
掌握視頻信號的箝位、偏置和交流耦合
摘要：本文闡述了視頻信號的箝位、偏置和交流耦合，與之對應的適當?shù)男盘?，雙電源和單電源供電的優(yōu)缺點，以及為什么某些電路更適合特定的應用。 為什么要...
2009-05-06 標簽：視頻 1501
MAX4090與重建濾波器的配合使用
摘要：在大多數(shù)視頻應用中，DAC產(chǎn)生的視頻信號需要經(jīng)過重建濾波器對輸出進行平滑濾波，消除采樣引起的混疊噪聲。MAX4090為直流耦合輸出驅(qū)動器，可以在重建濾波器之后驅(qū)動視頻...
2009-05-06 標簽：MAX4090 1177
視頻系統(tǒng)中視頻參數(shù)的視覺影響: 色度至亮度延遲的影響
摘要：影響視頻系統(tǒng)質(zhì)量的最終標準很大程序上取決于對最終圖像的視覺效果。雖然如此，工程人員在判別視頻系統(tǒng)質(zhì)量好壞時常常采用一套客觀的測試標準。色度與亮度延時的不...
2009-05-06 標簽：視頻 1323
用EDMA傳輸數(shù)字視頻信號
提出了如何利用EDMA將數(shù)字視頻信號從較小的緩沖區(qū)轉(zhuǎn)移到較大的存儲器，經(jīng)過排序組成一幅完整的圖像的方法。 關(guān)鍵詞：EDMA...
2009-05-05 標簽：視頻信號 1119
MM5483在加油機液晶顯示中的應用
介紹了液晶顯示驅(qū)動器MM5483在電腦加油機中的應用及其C51編程實現(xiàn)。? 關(guān)鍵詞：MM5483, 液晶顯示, 串行接口 1 引 言? 因為低電壓、微功耗、...
2009-05-05 標簽：液晶顯示 1375
用SAA7111A設計模擬視頻轉(zhuǎn)換接口
介紹了SAA7111A和AL251的特點、功能、原理以及在模擬轉(zhuǎn)換接口中的應用,并給出了硬件連接電路示意圖。? 關(guān)鍵詞：視頻A/D轉(zhuǎn)換, SAA7111A,AL251 1 引言? &nbs...
2009-05-05 標簽：視頻轉(zhuǎn)換 3474
Capacitor Type Selection Optim
Abstract: Microsoft Windows® next-generation client operating system, more commonly referred to as Windows Vista®, is enhancing the quality and fidelity of the desktop and notebook PC audio experience. Manufacturers must meet stric...
2009-05-05 標簽：audio 1589
最大限度地減少總諧波失真貢獻的模擬開關(guān)在音頻系統(tǒng)-Minim
Abstract: Analog switches are commonly used in audio systems to switch low-level inputs or adjust audio filter characteristics. Selecting the proper analog switch can help optimize the total harmonic distortion (THD) of a system within the...
駕駛音頻壓電傳感器-Driving Audio Piezoe
Abstract: This Audio application note identifies and describes the key elements in designing a driver for a Piezoelectric Transducer (PZT). The relationship between source impedance and sound pressure level is measured, single-ended (S/E) ...
優(yōu)化音頻橋系桿負載放大器-Optimizing Audio
Abstract: This audio bridge-tied load (BTL) amplifier application note describes a unique architecture that minimizes the differential output distortion and noise (THD+N). ...
使用DS1802按鈕數(shù)字電位器創(chuàng)建音頻放大器-Using a
Abstract: The DS1802 audio potentiometer contains two digitally controlled potentiometers and features a logarithmic taper that produces a 1dB change per increment. This application note describes using it in a push-button controlled audio...
D類音頻放大器節(jié)省電池壽命-Class D Audio Am
Abstract: This application note examines the operation and benefits of a Class D (switch-mode) audio amplifier. Switch-mode amplifiers such as the mono MAX4295 and stereo MAX4297 offer high quality audio with improved efficiency when compa...
2009-05-05 標簽：放大器 2774
音頻增益控制用數(shù)字電位器-Audio Gain Contro
Abstract: Digital potentiometers (pots) offer advantages in volume control applications over bulky mechanical pots, especially in handheld portable devices such as MP3 players, PDAs, cell phones, or stereo AM/FM radios. This document descr...
利用精巧的電路確保便攜式電腦的高品質(zhì)音質(zhì)
摘要：本文分析影響耳機放大器性能的關(guān)鍵參數(shù)，包括：PSRR、上電瞬態(tài)抑制以及PCB接地。所提供的解決方案僅關(guān)注一個應用(耳機放大器)，采用MAX4410與MAX4298/MAX4299耳機放大器。 ...
利用MAX5456/MAX5457構(gòu)成音量調(diào)節(jié)器
摘要：本應用筆記介紹了一種通過簡單的按鍵接口和三片MAX5456/MAX5457立體聲、對數(shù)抽頭數(shù)字電位器實現(xiàn)音量均衡、調(diào)節(jié)的方案。 ...
2009-05-05 標簽：MAX5456 1783
硅擴頻振蕩器在汽車電子產(chǎn)品中的應用
摘要：數(shù)字電子系統(tǒng)使我們的生活豐富多彩，但數(shù)字時鐘信號也扮演著“反面角色”，即傳導噪聲源(通過電纜)或電磁輻射干擾(EMI)。由于潛在的噪聲問題，電子產(chǎn)品需要經(jīng)過相關(guān)標...
2009-05-05 標簽：振蕩器 521
功能豐富、完善的GSM/GPRS蜂窩電話音頻記錄/回放方案
摘要：短促的設計周期，再加上印刷板空間和成本方面的壓力，迫使蜂窩電話電路不斷向更高集成度發(fā)展?；?低端)電話功能義無反顧地走向了單芯片方案。同時，嚴重關(guān)切品牌個...
2009-05-05 標簽：音頻 694
可自動關(guān)斷的揚聲器放大器，有效節(jié)省手機功耗
摘要：該電路在檢測到?jīng)]有音頻信號輸入時將自動關(guān)閉揚聲器驅(qū)動器，以節(jié)省手機的電池能量。 ...
對音頻放大器咔嗒聲的定量分析
摘要：咔嗒聲是指驅(qū)動變換器的放大器在打開或關(guān)閉過程中，音頻瞬變信號在耳機或揚聲器中產(chǎn)生的雜音。直到目前為止，業(yè)界仍然從主觀上評價這種咔嗒聲。“較低的咔嗒聲”和...
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