نتایج جستجو برای: mems microphone
تعداد نتایج: 18404 فیلتر نتایج به سال:
چکیده: قطعات mems بدلیل مزایایی از قبیل توان تلفاتی کم، نویز، وزن و قیمت کمی که دارند بسیار مورد توجه قرار گرفته اند و امروزه در سیستم های rf فرکانس بالا بسیار مورد استفاده قرار می گیرند. یکی از مهمترین المانهایی که قطعات mems دارند سوئیچ ها می باشند که دارای قابلیت مجتمع سازی هستند. سوئیچ ها در مقایسه با قطعات نیمه هادی از توان مصرفی خیلی پایین، فرکانس قطع بالا، تلفات داخلی کمتر و همچنین ایزو...
در این پایان نامه یک ساختار جدید برای سوئیچ های میکروالکترومکانیکی نوع موازی ارائه شده است . مشخصه بارز سوئیچ پیشنهاد شده ایزوله شدن بخش مرکزی بازو از زمین است. این امر باعث کاهش پدیده های خودتحریکی و چسبندگی (به دلیل ولتاژ موثر حاصل از سیگنال های با توان بالا) در این ساختار می شود. کاهش پدیده های خودتحریکی و چسبندگی در سوئیچ های میکروالکترومکانیکی می-تواند، باعث افزایش توان قابل حمل این سوئیچ ...
A polar pattern is a circular graph that shows how sensitive a microphone is in different directions. Each “circular” division represents 5dB of sensitivity, so you can see where the microphone picks up the strongest to the weakest sounds at different points. On the graph below, 0 degrees shows the direction the microphone is facing. 90 and 270 degrees are the sides of the microphone and 180 de...
In this paper, we introduce a noise robust speech recognition system for a voice-driven wheelchair. Our system has adopted a microphone array system in order for the user not to need to wear a microphone. By mounting the microphone array system on the wheelchair, our system can easily distinguish the user’s utterances from other voices without using a speaker identification technique. We have a...
Multi-microphone speech enhancement methods typically require a reference position with respect to which the target signal is estimated. Often, this arbitrarily chosen as one of microphones. However, it has been shown that choice microphone can have significant impact on final noise reduction performance. In paper, we therefore theoretically analyze selecting performance near-end being taken in...
Currently, the detection of targets using drone-mounted imaging equipment is a very useful technique and being utilized in many areas. In this study, we focus on acoustic signal with drone detecting where sounds occur, unlike image-based detection. We implement system which detects sources above ground by applying phase difference microphone array technique. Localization methods are based beamf...
In recent years, a very large amount of scientific work has been achieved around Micro-Electro-Mechanical Systems (MEMS). Some industrial success stories (accelerometers, gyroscopes and MOEMS) have shown their maturity. MEMS are now starting to take place around us in our everyday life as the microelectronic did 20 years ago. However, a lot of effort is still needed for the integration of ICs a...
Wireless Fidelity (WiFi) and Wireless microphone are assumed to operate on adjacent channels in TV White Spaces(TVWS). The Scenario of WiFi potentially interfering with Wireless microphone is analyzed through Minimum Coupling Loss (MCL) and Spectrum Engineering Advanced Monte Carlo Analysis Tool (SEAMCAT) based on the Monte-Carlo simulation method. In the case of single WiFi interfering with Wi...
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