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ADaptive

  • 基于有藍牙共存情況下的WiFi射頻模塊設計

    移動通信網絡由于帶寬和技術的限制,遠遠不能滿足人們不斷高漲的無線上網需求。Wi-Fi作為無線接入技術MLAN的主流標準口益成熟,它能夠隨時隨地高速連接到Internet,極大地滿足了用戶對無線上網需求,受到消費者的青睞。因而越來越多的移動終端都集成了Wi-Fi功能,Wi-Fi和藍牙樣成為移動終端的標配。隨之而來的是wi-Fi和藍牙都工作在2.4CHZz ISM頻段而引發的互相 擾問題,導致數據吞吐量下降,語音質量惡化失真,極端狀況下甚至導致鏈路斷開而不能正常工作。因此,必須尋求有效的措施和方法,實現兩種技術在近距離的和諧共存,這已成為非常迫切的技術需要,也成為人們研究的一個熱點和難點。近距離WiFi和藍牙互相1擾的問題,目前已經形成了非常多的有效解決機制,包括基于Wi-Fi的PTA(Packet Traffic Arbitration)、AWMA(Alternating Wireless Medium Access)和DSE(Deterministic Spectral Excision),其中PTA和AWMA機制在Wi-Fi側MAC層實現,通過協調Wi-Fi和藍牙的幀發射時間來避免相互干擾:而DSE是在Wi-Fi側物理層PHY實現,通過一個可編程帶阻濾波器(Notch Filter)來阻止來白藍牙的窄帶干擾。還有基于藍牙側的AFH(ADaptive Frequency Hopping),它通過跳頻,自動避開被干擾的頻點,從而大大提高了藍牙傳輸性能。

    標簽: 藍牙共存 wifi 射頻模塊

    上傳時間: 2022-06-20

    上傳用戶:zhanglei193

  • 單片機實現ADPCM編碼和解碼

    INTRODUCTION In the past, adding speech recording and playback capability to a product meant using a digital signal processor or a specialized audio chip. Now, using a simplified ADaptive Differential Pulse Code Modulation(ADPCM) algorithm, these audio capabilities can be added to any PICmicro device. This application note will cover the ADPCM compression and decompression algorithms, performance comparison of all PICmicro devices, and an application using a PIC16C72 micro-controller.DEFINITION OF TERMS step size -value of the step used for quantization of ana-log signals and inverse quantization of a number of steps.quantization -the digital form of an analog input signal is represented by a finite number of steps.ADaptive quantization -the step size of a quantizer is dramatically changed with time in order to adapt to a changing input signal.inverse quantizer -a finite number of steps is converted into a digital representation of an analog signal.

    標簽: 單片機 adpcm 編碼 解碼

    上傳時間: 2022-06-20

    上傳用戶:

  • 路斯特ServoOne手冊

    German universities and scientists have repeatedly set the intermational standard in drive technology. Identification and active compensation of natural frequencies in oscillatory mechanics, status controls with monitoring structures incorporating acceleration sensors, ADaptive compensation of measurement system deficiencies, self-adjusting detent torque compensation… everything invented with only a single aim in mind: to continue improv-ing the motion control, dynamics, precision and processing speed of your machines. For the industrial applicabability of this technology scientific publications in proceedings and laboratory test rigs are not enough. These features consequenty need to be converted into cost-efficient and easily manageable products. That 's exactly what we have done.So in future, if you should need more than today ' smarket can offer you, now everything isgoing to be alright. With our new high-performance ServoOne drive series you will experi-ence 

    標簽: servoone

    上傳時間: 2022-06-24

    上傳用戶:kingwide

  • STM32F407VET6數據手冊

    STM32F407VET6數據手冊Core: ARM 32-bit Cortex?-M4 CPU with FPU,ADaptive real-time accelerator (ARTAccelerator?) allowing 0-wait state executionfrom Flash memory, frequency up to 168   MHz,memory protection unit, 210 DMIPS/1.25 DMIPS/MHz (Dhrystone 2.1), and DSPinstructions

    標簽: stm32f407vet6 數據手冊

    上傳時間: 2022-07-25

    上傳用戶:

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