see Figure Seven 4 below ) required two pulse-width modulator (PWM) outputs to control the two motors; two encoders to provide velocity feedback for the two motors; two analog input channels for the Hall-effect sensor to detect the dancer position; two digital lines for signaling; and channels for thermal and air readings.

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MTMM-108-08-T-S-300

来源:LM317 Electronics Components编辑:OKI Semiconductor时间:2021-06-14 05:24:19

The tension-control hardware in our design (see Figure Seven 4 below ) required two pulse-width modulator (PWM) outputs to control the two motors; two encoders to provide velocity feedback for the two motors; two analog input channels for the Hall-effect sensor to detect the dancer position; two digital lines for signaling; and channels for thermal and air readings.

SUPPLIER: Eastman Kodak Co., Rochester, N.Y., www.kodak.com

PRODUCT: Quest X3ME

MTMM-108-08-T-S-300

WHAT IT DOES: Immerses a viewer into on-screen action by delivering synchronized, realistic motion on three axis points.

HOW IT'S DIFFERENT: The Quest X3ME (pronounced extreme”) transforms home entertainment by lifting a seated viewer in perfect synchronization with on-screen action and sound to create a virtual reality experience, drawing viewers into the action of movies, TV programs, sporting events and games. Inspired by the motion simulators in theme parks, the X3ME employs a D-Box developed simulator that operates with existing audio and video equipment. It incorporates actuators placed under the four corners of the seating platform and relies on a computerized control system to synchronize with action on the screen.

X3ME is available only as a single chair in premium leather. The films for which F/X Motion Codes have been written include The French Connection” and Black Hawk Down.”

MTMM-108-08-T-S-300

SUPPLIER: D-Box Technologies Inc., Compton, Calif., www.d-box.com

MTMM-108-08-T-S-300

PRODUCT: SMS3-250 Smart Media Server

In a system that will incorporate audio/speech algorithms, robust audio firmware is a must. It must give the maximum time and accurate data to the algorithms to perform efficiently. One common mistake is to interrupt the core upon each sample's arrival. If the algorithm operates only on the frames of a fixed number of samples, other interrupts are redundant. DMAs and internal FIFOs can collect samples and interrupt the core after collecting a frame.

Example algorithms When developing any telecommunication system, engineers often begin by testing the voice quality with the typical pulse-code modulation (PCM) codec, known as G.711. This narrow-band codec restricts the sample amplitude to 8-bit precision and produces a 64-kbit/s throughput. The encoder and decoder work on each data sample using a weightless algorithm with little complexity and almost no processing delay. This gives designers the option to play with it and verify the system.

Checking the signal levels, adjusting the hardware codec gains, synchronizing the near and far-end interrupts, verifying the DMA function, or any other experiment can be accomplished using this basic telephony standard. During this process, don't be surprised to find that the received compressed data is in bit-reversed manner. A simple bit-reversing” code will bring it back to the expected state.

Any wideband speech codec could be used as an example of a speech algorithm that's heavy in terms of memory and clock consumption. One example is sub-band ADPCM (adaptive differential PCM), or G.722, which operates on data sampled on 16 kHz and thus covers entire speech spectrum. It retains the unvoiced frequency components, those between 4 and 7 kHz that provide high-quality natural speech.

Before any codec is integrates into a system, I recommend that the designer do careful testing. While G.711 encoding and decoding can be tested on a sample-by-sample basis, codecs that involve filters and other frequency-domain algorithms are tested differently, using a stream of at least few thousand samples. The codec verification engages the engineer in unit testing with ITU vectors, signal-level testing, and interoperability testing with other available codecs. Interoperability issues related to arranging the encoded data in 16-bit word before transmitting and mismatching in signal levels aren't new to system integration engineers.

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