Spread-spectrum communication is a core area within the field of digital communication. Originally used in military networks as countermeasures against the threats of jamming and interception, spread-spectrum systems are now widely used in commercial applications and are part of several wireless and mobile communication standards. Although spread-spectrum communication is a staple topic in textbooks on digital communication, its treatment is usually cursory. This book is designed to provide a more intensive examination of the subject that is suitable for graduate students and practicing engineers with a solid background in the theory of digital communication. As the title indicates, this book stresses principles rather than specific current or planned systems, which are described in manyotherbooks.My goal in this bookis to providea concisebut lucidexplanation of the fundamentals of spread-spectrum systems with an emphasis on theoretical principles.
標簽： Spread-Spectrum Communication Systems 2nd
上傳時間： 2020-06-01
上傳用戶：shancjb
In this chapter we give a quick overview of control theory, explaining why integral feedback control works, describing PID controllers, and summariz- ing some of the currently available techniques for PID controller design. This background will serve to motivate our results on PID control, pre- sented in the subsequent chapters.
標簽： Controllers Time-Delay Systems PID for
上傳時間： 2020-06-10
上傳用戶：shancjb
這是我在做大學教授期間推薦給我學生的一本書，非常好，適合入門學習。《python深度學習》由Keras之父、現任Google人工智能研究員的弗朗索瓦?肖萊（Franc?ois Chollet）執筆，詳盡介紹了用Python和Keras進行深度學習的探索實踐，包括計算機視覺、自然語言處理、產生式模型等應用。書中包含30多個代碼示例，步驟講解詳細透徹。作者在github公布了代碼，代碼幾乎囊括了本書所有知識點。在學習完本書后，讀者將具備搭建自己的深度學習環境、建立圖像識別模型、生成圖像和文字等能力。但是有一個小小的遺憾：代碼的解釋和注釋是全英文的，即使英文水平較好的朋友看起來也很吃力。本人認為，這本書和代碼是初學者入門深度學習及Keras最好的工具。作者在github公布了代碼，本人參照書本，對全部代碼做了中文解釋和注釋，并下載了代碼所需要的一些數據集（尤其是“貓狗大戰”數據集），并對其中一些圖像進行了本地化，代碼全部測試通過。（請按照文件順序運行，代碼前后有部分關聯）。以下代碼包含了全書約80%左右的知識點，代碼目錄：2.1: A first look at a neural network（ 初識神經網絡）3.5: Classifying movie reviews（電影評論分類：二分類問題）3.6: Classifying newswires（新聞分類：多分類問題 ）3.7: Predicting house prices（預測房價：回歸問題）4.4: Underfitting and overfitting（ 過擬合與欠擬合）5.1: Introduction to convnets（卷積神經網絡簡介）5.2: Using convnets with small datasets（在小型數據集上從頭開始訓練一個卷積網絡）5.3: Using a pre-trained convnet（使用預訓練的卷積神經網絡）5.4: Visualizing what convnets learn（卷積神經網絡的可視化）
上傳時間： 2022-01-30
上傳用戶：
STM32L053C8T6數據手冊Features ? Ultra-low-power platform – 1.65 V to 3.6 V power supply – -40 to 125 °C temperature range – 0.27 μA Standby mode (2 wakeup pins) – 0.4 μA Stop mode (16 wakeup lines) – 0.8 μA Stop mode + RTC + 8 KB RAM retention – 139 μA/MHz Run mode at 32 MHz – 3.5 μs wakeup time (from RAM) – 5 μs wakeup time (from Flash) ? Core: ARM? 32-bit Cortex?-M0+ with MPU – From 32 kHz up to 32 MHz max. – 0.95 DMIPS/MHz ? Reset and supply management – Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds – Ultralow power POR/PDR – Programmable voltage detector (PVD) ? Clock sources – 1 to 25 MHz crystal oscillator – 32 kHz oscillator for RTC with calibration – High speed internal 16 MHz factory-trimmed RC (+/- 1%) – Internal low-power 37 kHz RC – Internal multispeed low-power 65 kHz to 4.2 MHz RC – PLL for CPU clock ? Pre-programmed bootloader – USART, SPI supported ? Development support – Serial wire debug supported ? Up to 51 fast I/Os (45 I/Os 5V tolerant) ? Memories – Up to 64 KB Flash with ECC – 8KB RAM – 2 KB of data EEPROM with ECC – 20-byte backup register
標簽： stm32l053c8t6
上傳時間： 2022-02-06
上傳用戶：
數字示波器功能強大,使用方便,但是價格相對昂貴。本文以Ti的MSP430F5529為主控器,以Altera公司的EP2C5T144C8 FPGA器件為邏輯控制部件設計數字示波器。模擬信號經程控放大、整形電路后形成方波信號送至FPGA測頻,根據頻率值選擇采用片上及片外高速AD分段采樣。FPGA控制片外AD采樣并將數據輸入到FIFO模塊中緩存,由單片機進行頻譜分析。測試表明:簡易示波器可以實現自動選檔、多采樣率采樣、高精度測頻及頻譜分析等功能。Digital oscilloscope is powerful and easy to use, but also expensive. The research group designed a low-cost digital oscilloscope, the chip of MSP430F5529 of TI is chosen as the main controller and the device of EP2C5T144C8 of Altera company is used as the logic control unit. Analog signal enter the programmable amplifier circuit, shaping circuit and other pre-processing circuit. The shaped rectangular wave signal is sent to FPGA for measure the frequency. According to the frequency value to select AD on-chip or off-chip high-speed AD for sampling. FPGA controls the off-chip AD sampling and buffers AD data by FIFO module. The single chip microcomputer receives the data, and do FFT for spectrum analysis. The test shows that the simple oscilloscope can realize automatic gain selection, sampling at different sampling rates, high precision frequency measurement and spectrum analysis.
上傳時間： 2022-03-27
上傳用戶：
Introduction The Sil9135/Sil9135A HDMI Receiver with Enhanced Audio and Deep Color Outputs is a second-generation dual-input High Definition Multimedia Interface(HDMI)receiver. It is software-compatible with the Sil9133receiver, but adds audio support for DTS-HD and Dolby TrueHD. Digital televisions that can display 10-or 12-bit color depth can now provide the highest quality protected digital audio and video over a single cable. The Sil9135and Sil9135A devices, which are functionally identical, can receive Deep Color video up to 12-bit,1080p @60Hz. Backward compatibility with the DVI 1.0specification allows HDMI systems to connect to existing DVI 1.0 hosts, such as HD set-top boxes and PCs. Silicon Image HDMI receivers use the latest generation Transition Minimized Differential Signaling(TMDS) core technology that runs at 25-225 MHz.The chip comes pre-programmed with High-bandwidth?
上傳時間： 2022-06-25
上傳用戶：
開關升壓型鋰電池充電管理芯片FLD5302/3概述 為開關型兩節或三節鋰離子/鋰 聚合物電池充電管理芯片，非常適合于便攜 式設備的充電管理應用。 集電壓和電 流調節器、預充、充電狀態指示和充電截止 適配器自適應等功能于一體，采用 SOP-8 封裝。 對電池充電分為三個階段：預 充（ Pre-charge ）、恒流（CC/Constant Current）、恒壓（CV/Constant Voltage）過程。 集成過壓及過流保護，確保電芯的 安全。
上傳時間： 2022-06-25
上傳用戶：
eMMC (Embedded Multi Media Card）是MMC協會訂立、主要針對手機或平板電腦等產品的內嵌式存儲器標準規格。eMMC在封裝中集成了一個控制器，提供標準接口并管理閃存，使得手機廠商就能專注于產品開發的其它部分，并縮短向市場推出產品的時間。MMC的應用是對存儲容量有較高要求的消費電子產品。2011年已大量生產的一些熱門產品，如Palm Pre、Amazon Kindle II和Flip MinoHD，都采用了eMMC。為了確認這些產品究竟使用了何種存儲器，iSuppli利用拆機分析業務對它們進行了拆解，發現eMMC身在其中。附件為介紹EMMC5.1標準的數據手冊.
上傳時間： 2022-06-27
上傳用戶：
FU6831 是一款集成 8051 內核和電機控制引擎(ME)的電機驅動專用芯片，8051 內核處理常規事務，ME 處理電機實時事務，雙核協同工作實現各種高性能電機控制。其中 8051 內核大部分指令周期為 1T 或 2T，芯片內部集成有高速運算放大器、比較器、Pre-driver、高速 ADC、高速乘/除法器、CRC、SPI、I2C、UART、多種 TIMER、PWM 等功能，內置高壓 LDO，適用于 BLDC/PMSM 電機的方波、SVPWM/SPWM、FOC 驅動控制。預驅動為 3P3N Predriver 輸出。
標簽： fu6831
上傳時間： 2022-07-09
上傳用戶：
FU6831/11 是一款集成 8051 內核和電機控制引擎(ME)的電機驅動專用芯片，8051 內核處理常規事務，ME 處理電機實時事務，雙核協同工作實現各種高性能電機控制。其中 8051 內核大部分指令周期為 1T 或 2T，芯片內部集成有高速運算放大器、比較器、Pre-driver(FU6811 除外)、高速 ADC、高速乘/除法器、CRC、SPI、I2C、UART、多種 TIMER、PWM 等功能，內置高壓 LDO，適用于BLDC/PMSM 電機的方波、SVPWM/SPWM、FOC 驅動控制。預驅動類型為：FU6811 為 Gate Driver 輸出；FU6831 為 3P3N Predriver 輸出。
標簽： FU6831
上傳時間： 2022-07-09
上傳用戶：
