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EETE MAY 2013

the ability of the user to accurately select small objects. This in turn constrains the UI design. It is important to distinguish tremor from intentional movements, and treat the two separately. This task is not simple, as tremor varies from individual to individual, varies based on remote control design, and varies based on the specific posture of the user at that time. The solution must undergo significant testing, specifically of the remote control design as size, shape, weight, balance and button layout all affect the level of tremor seen. This testing is important from concept through prototyping and should cover the full range of use cases for motion control, with users in various postures and positions relative to the TV. Additionally, unintentional motions caused by pressing a button have to be identified and removed. This can be done by freezing the cursor on the press of a button, and by the action executing on release of the button rather than the press of a button, which typically causes the larger unintentional motion – see figure 2. Challenge 3: There’s a difference between the ‘two foot’ and the ‘ten foot’ environment. PC mouse users generally sit around two feet from their monitor, looking straight on. Living room airmouse user is not required to hold the remote control exactly parallel to the floor or point the remote directly at the TV in order to use it – see figure 3. A person can lie on the sofa at a 30 degree viewing angle to the TV, and make small wrist motions, and control the cursor in a more relaxed manner. This article barely scratches the surface of the challenges facing engineers seeking to design the most efficient motion control interfaces for Smart TVs. We saw when air-mice first entered the market around 2003, they were met with mixed reviews, as Fig 2: Low pass filters can cause a motion ‘dead zone’ which makes it difficult to select small objects. issues around latency, precision, and in-hand ergonomics were very apparent to reviewers and users alike. However, adoption has followed the maturation and improvement of the technology, and today major brands such as LG, TCL and Roku are making air-mouse products an essential part of the user experience for their products. The new interactions are helping consumers find more content, more enjoyably, and we’re convinced that the growing momentum behind motion control technology will change how consumers use TVs every day. Fig 3: Orientation Compensation translates motion from the device frame to the user frame. capacitors power film & dc link • High performance in rugged, Hi-Rel packages • Maximum capacitance values – up to 10,000μF • Low inductance, low ESR and ESL with low DF • Voltages to 10,000 VDC, ripple currents up to 400 Arms, 150°C operation • Ideal for renewable energy power converters, off-highway vehicle traction control, electric vehicle battery chargers and many others Download our NEW datasheet Call 49.9122.7950 or visit eis.apitech.com/film Power Film Capacitors API Technologies – Spectrum Control has developed a new line of power film capacitors, designed using the latest film technology to achieve maximum capacitance density. Available in application-specific packages and terminations, these new power film capacitors feature rugged construction to withstand even the harshest environments. Features and Specifications Metallized: polyester, polypropylene and polyphenylene sulphide film dielectrics Temperature ratings -55°C up to + 150°C Low ESR and ESL construction Rugged construction for even the harshest environments In-house electrical, environmental and reliability testing verification Standard designs up to 20,000 VDC/ 750 VAC Standard capacitance values up to 10,000 μF Applications Renewable energy inverters – solar converters, wind turbines and fuel cells Electric vehicle power conversion and battery chargers Aircraft power conversion systems Radar systems, laser pulse power Industrial welders, elevators, rail traction drives High voltage power supplies, switching power supplies Medical imaging equipment, defibrillators Model Features & Ordering Information Example: 55DC-801-401-F 55HV – 20K – 103 – M Voltage Code 20K = 20,000 VDC High Voltage Capacitor Series Capacitance Code* 103 = 0.01 μF Tolerance** M = ±20% High Voltage Capacitor Series Metalized polyester Flame retardant tape wrap and epoxy end fill Temperature -55°C to + 125°C Voltages up to 20,000 VDC 55PP – 801 – 106 – K Voltage Code 801 = 800 VDC Power Polypropylene Capacitor Series Capacitance Code* 106 = 10 μF Tolerance** M = ±10% High Power Capacitor Series Metalized polypropylene, low loss Flame retardant tape wrap and epoxy end fill Axial leads or tab termination Low ESL & ESR design for high ripple currents Temperature -55°C to +105°C Voltages up to 2,000 VDC Capacitance 1-100 μF * Capacitance in Picofarads. The first two digits are significant and the third represents the number of zeros. ** Indicates standard tolerance. Others available upon request. For complete specs and drawings, visit eis.apitech.com/film      users can be sitting, standing or lying down in many different orientations, at different distances, and at various angles with respect to the TV. The use of the remote control must be comfortable and usable in all these positions, and the user should be able to focus on the content on the TV, regardless of how the remote is being held. This makes it essential that the orientation of the remote is compensated for. This feature, called “Orientation Compensation”, translates the device frame of reference into the user frame of reference. So when the user moves the remote to the left, the cursor will move left, even if the PowerFilmAd-EETE_Layout 1 3/1/13 11:35 AM Page 1 remote control is held with roll. This means that the EMI Filters • EMI Filtered Connectors • Advanced Ceramics • Power Filters & Capacitors • Magnetics www.electronics-eetimes.com Electronic Engineering Times Europe May 2013 31


EETE MAY 2013
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