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Designing a Low-Cost ECG Sensor and Monitor: Practical Considerations and Measures
Published in Daniel Tze Huei Lai, Rezaul Begg, Marimuthu Palaniswami, Healthcare Sensor Networks, 2016
Ahsan H. Khandoker, Brian A. Walker
The USB, or universal serial bus, is definitely not new technology, as it was originally developed in 1995 by Intel and Microsoft to meet the need for an inexpensive and widespread solution that would allow connection of a wide range of peripheral devices to their respective PCs (Jungo 2010). One advantage of USB is its plug-and-play feature, which enables the computer to automatically detect the peripheral device upon connection and install any necessary software needed to communicate with the device. USB currently operates at a number of speeds, from low speed (1.5 Mb/s) to high speeds of 480 Mb/s and above. Many cheap, widely available microcontrollers handle USB at what is known as full speed, which corresponds to a rate of 12 Mb/s. Both USB v1.1 and v2.0 can operate at full speed. USB v2.0 is backward-compatible and able to operate at even the lowest speeds. It is rare to find a microcontroller able to handle the highest speeds, for obvious reasons. Microcontrollers with inbuilt dedicated USB hardware can usually handle full-speed USB communication.
PC expansion bus systems
Published in Mike Tooley, PC Based Instrumentation and Control, 2013
A typical example of isochronous data is voice. If the delivery rate of this type of data stream is not maintained, drop-outs can occur due to buffer or frame underruns or overruns. Even if data is delivered at the appropriate rate by USB hardware, delivery delays introduced by software may degrade applications requiring real-time turn-around. To safeguard the delivery of data at the desired rate, USB isochronous data streams are allocated a dedicated portion of the USB bandwidth.
Theoretical and experimental evidence of the bulk relaxation peak on the loss tangent versus frequency diagrams for concrete
Published in Mechanics of Advanced Materials and Structures, 2023
Marina V. Shitikova, Ivan I. Popov, Yury A. Rossikhin
In the present work, damping is measured by the Resonant Frequency Damping Analyzer, RFDA Basic, using the Impulse Excitation Technique. The details of the method are discussed in [33]. Original RFDA Basic device has the following composition:RFDA Basic software (Installation CD);USB hardware key;Transducer (Logitech USB-microphone);Manual excitation device;Reference sample;Universal wire support;Computer system (not included).