this is a digital intercom projects using ADC PWM and UART interrupt. you take the value from mic enter it to ADC and then send serially to the other microcontroller which receives the data and transform the digital data into analog data by PWM which is connected to speaker
標簽： interrupt intercom projects digital
上傳時間： 2017-04-19
上傳用戶：亞亞娟娟123
The TAS3204 is a highly-integrated audio system-on-chip (SOC) consisting of a fully-programmable, 48-bit digital audio processor, a 3:1 stereo analog input MUX, four ADCs, four DACs, and other analog functionality. The TAS3204 is programmable with the graphical PurePath Studio? suite of DSP code development software. PurePath Studio is a highly intuitive, drag-and-drop environment that minimizes software development effort while allowing the end user to utilize the power and flexibility of the TAS3204’s digital audio processing core. TAS3204 processing capability includes speaker equalization and crossover, volume/bass/treble control, signal mixing/MUXing/splitting, delay compensation, dynamic range compression, and many other basic audio functions. Audio functions such as matrix decoding, stereo widening, surround sound virtualization and psychoacoustic bass boost are also available with either third-party or TI royalty-free algorithms. The TAS3204 contains a custom-designed, fully-programmable 135-MHz, 48-bit digital audio processor. A 76-bit accumulator ensures that the high precision necessary for quality digital audio is maintained during arithmetic operations. Four differential 102 dB DNR ADCs and four differential 105 dB DNR DACs ensure that high quality audio is maintained through the whole signal chain as well as increasing robustness against noise sources such as TDMA interference. The TAS3204 is composed of eight functional blocks: Clocking System Digital Audio Interface Analog Audio Interface Power supply Clocks, digital PLL I2C control interface 8051 MCUcontroller Audio DSP – digital audio processing 特性 Digital Audio Processor Fully Programmable With the Graphical, Drag-and-Drop PurePath Studio? Software Development Environment 135-MHz Operation 48-Bit Data Path With 76-Bit Accumulator Hardware Single-Cycle Multiplier (28 × 48)
上傳時間： 2016-05-06
上傳用戶：fagong
This design uses Common-Emitter Amplifier (Class A) with 2N3904 Bipolar Junction Transistor. Use “Voltage Divider Biasing” to reduce the effects of varying β (= ic / ib) (by holding the Base voltage constant) Base Voltage (Vb) = Vcc * [R2 / (R1 + R2)] Use Coupling Capacitors to separate the AC signals from the DC biasing voltage (which only pass AC signals and block any DC component). Use Bypass Capacitor to maintain the Q-point stability. To determine the value of each component, first set Q-point close to the center position of the load line. (RL is the resistance of the speaker.)
標簽： 音頻放大器設(shè)計 電路圖 英文
上傳時間： 2020-11-27
上傳用戶：
黑金CYCLONE4 EP4CE6F17C8 FPGA開發(fā)板ALTIUM設(shè)計硬件工程（原理圖+PCB+AD集成封裝庫）,Altium Designer 設(shè)計的工程文件，包括完整的原理圖及PCB文件，可以用Altium(AD)軟件打開或修改，可作為你產(chǎn)品設(shè)計的參考。集成封裝器件型號列表：Library Component Count : 50Name Description----------------------------------------------------------------------------------------------------1117-3.3 24LC04B_0 4148 BAV99 CAP NP_Dup2CAP NP_Dup2_1 CAP NP_Dup2_2CP2102_0 C_Dup1 C_Dup1_1C_Dup2 C_Dup3 C_Dup4 C_Dup4_1 Circuit Breaker Circuit BreakerConnector 15 Receptacle Assembly, 15-Pin, Sim Line ConnectorDS1302_8SO EC EP4CE6F17C8 Cyclone IV Family FPGA, 2V Core, 179 I/O Pins, 2 PLLs, 256-Pin FBGA, Speed Grade 8, Commercial GradeEP4CE6F17C8_1 Cyclone IV Family FPGA, 2V Core, 179 I/O Pins, 2 PLLs, 256-Pin FBGA, Speed Grade 8, Commercial GradeFuse 2 FuseHEX6HY57651620/SO_0 Header 2 Header, 2-PinHeader 9X2 Header, 9-Pin, Dual rowINDUCTOR JTAG-10_Dup1 KEYB LED LED_Dup1 M25P16-VMN3PB 16 Mb (x1) Automotive Serial NOR Flash Memory, 75 MHz, 2.7 to 3.6 V, 8-pin SO8 Narrow (MN), TubeMHDR2X20 Header, 20-Pin, Dual rowMiniUSBB OSCPNP R RESISTOR RN RN_Dup1 R_Dup1 R_Dup2 R_Dup3 R_Dup5R_Dup6 SD speakerSRV05-4SW KEY-DPDT ZTAbattery
標簽： 黑金 cyclone4 ep4ce6f17c8 fpga
上傳時間： 2021-12-22
上傳用戶：
高通(Qualcomm)藍牙芯片QCC5151_硬件設(shè)計詳細指導(dǎo)書（官方內(nèi)部培訓(xùn)手冊）共52頁其內(nèi)容是針對硬件設(shè)計、部分重要元器件選擇(ESD，F(xiàn)ilter）及走線注意事項的詳細說明。2 Power management 2.1 SMPS 2.1.1 Components specification 2.1.2 Input power supply selection 2.1.3 Minimize SMPS EMI emissions 2.1.4 Internal LDOs and digital core decoupling 2.1.5 Powering external components 2.2 Charger 2.2.1 Charger connections.2.2.2 General charger operation2.2.3 Temperature measurement during charging 2.3 SYS_CTRL 3 Bluetooth radio3.1 RF PSU component choice 3.2 RF band-pass filter3.3 Layout (天線 走線的注意事項)4 Audio4.1 Audio bypass capacitors 4.2 Earphone speaker output4.3 Line/Mic input 4.4 Headphone output optimizition5 LED pads 5.1 LED driver 5.2 Digital/Button input 5.3 Analog input5.4 Disabled 6 Reset pin (Reset#)7 QSPIinterface 8 USB interfaces 8.1 USB device port8.1.1 USB connections8.1.2 Layout notes8.1.3 USB charger detection
上傳時間： 2022-01-24
上傳用戶：XuVshu
USB音頻方案,USB聲卡方案1. 描述ATE1133是一顆包含音頻編解碼器、HIFI級單麥克風輸入和立體聲耳機輸出解決方案。內(nèi)部集成多個模塊，包括高速&全速USB Host/Device收發(fā)器(PHY)，ARM??Cortex?-M4?32-bit?MCU內(nèi)核主頻96MHZ，16bit ADC采樣率：48、96KHZ、16bit DAC采樣率：48、96KHZ，支持標準安卓耳機線控按鍵控制，支持美標CTIA帶耳機插拔檢測。它非常適用于USB C型桌面拓展塢、數(shù)據(jù)音頻HUB、視頻會議、Type-c耳機、C型音頻轉(zhuǎn)接頭、USB話務(wù)耳機、USB車載AUX音頻線等應(yīng)用。此外還支持上位機Windows PC端軟件界面在線調(diào)試仿真和更新片內(nèi)flash閃存。2.特點·符合USB 2.0全速運行·符合USB AUDIO & HID設(shè)備類規(guī)范·支持Headset模式·支持Microphone模式·支持speaker模式·支持硬件設(shè)置三種模式切換·支持左右聲道平衡·麥克風Audio-ADC參數(shù)： 采樣率：48、96KHZ 位寬：16Bit THD+N=0.005% SNR≥98 Bias電壓：3V·立體聲耳機輸出Audio-DAC參數(shù)： 采樣率：48、96KHZ 位寬：16Bit THD+N=0.003%(RL=32Ω) RL輸出擺幅=1.6V 直驅(qū)16/32Ω耳機，最大功率35mW·內(nèi)置低功耗ARM核心，全速運行功耗=3.3V@18ma，功耗0.06mW·支持線控耳機模式：上一曲、下一曲、播放/暫停、點按音量加減、長按音量連續(xù)加減·芯片單電源供電：3.3~5V-MAX·32針腳QFN32 4X4 封裝
上傳時間： 2022-03-22
上傳用戶：shjgzh
高通(Qualcomm)藍牙芯片QCC5144_硬件設(shè)計詳細指導(dǎo)書（官方內(nèi)部培訓(xùn)手冊）其內(nèi)容是針對硬件設(shè)計、部分重要元器件選擇(ESD，F(xiàn)ilter）及走線注意事項的詳細說明。2 Power management 2.1 SMPS 2.1.1 Components specification 2.1.2 Input power supply selection 92.1.3 Minimize SMPS EMI emissions 2.1.4 Internal LDOs and digital core decoupling 2.1.5 Powering external components 2.2 Charger 2.2.1 Charger connections.2.2.2 General charger operation2.2.3 Temperature measurement during charging 2.3 SYS_CTRL 3 Bluetooth radio3.1 RF PSU component choice 3.2 RF band-pass filter3.3 Layout (天線 走線的注意事項)4 Audio4.1 Audio bypass capacitors 4.2 Earphone speaker output4.3 Line/Mic input 4.4 Headphone output optimizition5 LED pads 5.1 LED driver 5.2 Digital/Button input 5.3 Analog input5.4 Disabled 6 Reset pin (Reset#)7 USB interfaces7.1 USB device port7.1.1 USB device port7.1.2 Layout notes 7.1.3 USB charger detectionA QCC5144 VFBGA example schematic and BOM B Recommended SMPS components specificationB.1 Inductor specifition B.2 Recommended inductors B.3 SMPS capacitor specifition
上傳時間： 2022-04-07
上傳用戶：默默
在疫情下，世界各國都面對著嚴峻的挑戰(zhàn)，人民的生活模式和商業(yè)模式都因為疫情爆發(fā)而需要作出改變，例如減少人流在外的活動和時間，減少社交活動等，以降低因為人與人之間的接觸而導(dǎo)致的病毒傳播風險。 疫情期間，大多數(shù)人與人之間的社交活動已經(jīng)停止，但社會的商業(yè)活動還是一直在進行， 這避免不了會產(chǎn)生人與人之間的互動和接觸。為了減少人與人之間的接觸，我們只好使用互聯(lián)網(wǎng)來保持人與人和公司與公司之間的商業(yè)交往，從而使商業(yè)活動在疫情期間可以繼續(xù)進行。 目前，最普遍的是使用電腦或手機連接互聯(lián)網(wǎng)，經(jīng)過大氣電波可以聽到對方的聲音和看見對方的影像。這種方式在個人對個人的互聯(lián)網(wǎng)連接使用是足夠，而且效果也不錯。但如果在公司對公司的會議中，各有一大群人圍在一起進行會議，單純電腦與電腦或手機與手機的連接，出來的效果恐怕不會好。 首先，傳統(tǒng)電腦和手機在原始設(shè)計的時候，只針對個人應(yīng)用，它并沒有預(yù)計在今天疫情期間，公司之間會廣泛的用它來做群組會議的功能。其二，電腦的收音只是固定在特定的方向，會議期間不同的人在不同的方向講話，它的拾音能力絕對不能滿足需求。其三，電腦和手機沒有使用專門的語音芯片做語音處理，會議期間會出現(xiàn)雜音，嘯叫，拾音不良 … …等等的情況，嚴重影響會議的質(zhì)量和效果。 因此，選用一個帶有專門語音處理功能的外置拾音speaker，對會議的質(zhì)量會大大提升。本文會對這產(chǎn)品的要求做詳細的介紹。
上傳時間： 2022-04-11
上傳用戶：
該文件包括了華為P8手機所有的電路圖設(shè)計，其中主基板部分包括了片上電源模塊和電源管理模塊，SOC各個外設(shè)接口部分，eMMC和DDR3，LCD，USB，Camera，Codec，Audio/speaker,SIM Card,FPC 接口以及headphone等等，而調(diào)制解調(diào)器部分則包括了RF 接口，RF Transceiver，RF ANT Tunner,BW/WLAN/FM/NFC,GPS,RF PA等等部分，各個子電路圖非常詳盡，具有極高的參考價值
上傳時間： 2022-04-17
上傳用戶：
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