Cutoff frequency

Chapter 5 Proximity Sensor 5.1 Introduction A proximity sensors is the sensor able to detect the presence of nearby objects without any physical contact. A proximity sensors often emits an electromagnetic field or a beam of electromagnetic radiation, and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity sensor's target. Different proximity sensor target demand different sensor. For examples a capacitive or photoelectric sensors…

In the first place let begin by saying what is the (LRAD)? It is The Long Range Acoustic Device. Which is a loud megaphone/microphone or speaker to convey important messages to individuals who makes loud noise and disturb the environment. Certainly, the LRAD is not a less lethal weapon. Of course, the LRAD is used to get the attention of a large crowd or a criminal is about to break the law by disturbing the peace. The LRAD once in operation will get the attention of the troublemaker, prevent…

microchip placed into things like: supermarket items(known as the barcode), inside people, pets, computers, phones, etc. to track them down, read their data and transfer files to and from. An RFID tag is a Radio frequency identification device(Tag You're It 72). It contains radio frequency which means anyone with an RFID tag reader can receive radio waves and see whatever the RFID tag contains. Even Though RFID’s track kids and pets that ran away from home, they should not be used because they…

wireless local area network (WLAN), cellular phone, medical applications. and satellite communication. As shown in Fig. 1, The Microstrip Patch Antenna consists of a metallic patch above a ground plane. The shape and size of patch determine the frequency of operation of the antenna and its…

1.1 Overview: In antenna theory of analysis and design, the most forward looking topic is microstrip patch antenna. Microstrip patch antennas are made to have many different geometrical shapes and dimensions but among all the shapes of microstrip patch, four of them are most common than another that are square, rectangular, dipole and circular. They are employed in wide range of modern applications because of their easiness to design and compatibility with printed-circuit technology. The basic…

Extra Extra read all about it Haarp, An Government Weapon? On 1993 in Gakona, Alaska something weird was born a machine that most people didn’t know could be so powerful. Haarp, an High frequency active auroral research program is what Haarp Actually stand for if you do not know. Most people think that this machine is very dangerous, Most know this machine can change the world. Money, an issue any person can have trouble with. Haarp has gotten millions 300 (to be exact) of tax dollars every…

Time Domain Sampling Implementing the signal generator a sine wave was generated with an amplitude of approximately 3 volts and a frequency of 800Hz. One second of data was recorded at the following sample rates: 2048, 3200, 6400, and 25600 samples/sec. The LPF in the DAQ was then set to 1Hz below the Nyquist frequency for each different sample rate. The maximum amplitude seen for each acquisition were as follows: • 2048Hz: 1.5229e-04 V • 3200Hz: 1.1791e-04 V • 6400Hz:…

of harmonics and presents the most accurate reproduction of the original sound. (33) Exponential Horn: The exponential horn has a specific acoustic loading property that allows the speaker driver to remain evenly balanced in output level over its frequency range. (34) Exponential horns are defined as horns for which the axial length is exponentially related to the area of the horn.…

the most commonly used self-assessed method to diagnose postpartum depression in women, including minorities and teenagers. Each question response is coded from 0-3, with 30 being the maximum total score. A cutoff score of 10 or more identifies women as high risk for postpartum depression. A cutoff score of 13 or more indicates a major depressive disorder. The DDI has been determined reliable across different populations. It is one of the most widely used evaluations for measuring the severity…

Speech perception is the process by which the sounds of a language are heard, interpreted and understood. ‘Speech perception’ is defined as the receptive language process in which the input signal is speech. ‘Hearing’ is one of the sensory processes that may be used in speech perception. Thus “speech perception is a particular form of receptive language processing and hearing is a particular sensory modality contributing to speech perception” (Marschark & Spencer, 2011). Speech audiometry has…