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Ittiam Systems Announces the Availability of High Performance Multimedia Codecs on the ARM Cortex-A8. |
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Octasic Provides Echo Cancellation for ZTE Corporation’s 3G Wireless Products |
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BittWare Announces Altera® Stratix® IV GX-based AMC . |
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Sundance and Dillon Marry Fastest FFT with Fastest Virtex-5 LXT FPG. |
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Xilinx Virtex-5 FXT Devices Move Into Production as New Virtex-5 TXT FPGA Platform Becomes Available. |
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High Performance 32-bit Stereo DAC Optimized for Sound Quality |
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TI introduces new low-power audio codec with integrated Class-D amplifier |
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| DSP Software Radio Techniques by A Bateman, C Mayhew, G Carter - DSP e-Newsletter Staff |
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Delivering high-speed wireless connection to the Internet for business and residential users is a massive business opportunity and technical challenge. Governments around the globe are proactively allocating new blocks of spectrum specifically to facilitate this service, trying to ensure that their respective economies benefit from full exploitation of the Internet potential.
The design challenge for the wireless terminal is to achieve robust communication at the desired data rate, with good spectral efficiency, (in order to maximise data rate or number of users for a given frequency allocation), the minimum of set-up and maintenance overhead, at a competitive price. From a manufacturing standpoint, it is also essential that the wireless platform can be easily tailored to new frequency bands as they become available, and be able to exploit and/or manage the characteristics of the channel and variable data transfer demands in a flexible manner.
This article looks at using a software radio approach to wireless Internet terminal design, harnessing the ever increasing MIPS/Watt potential of modern DSP devices. The result is a highly configurable, low cost solution with minimal frequency selective components, high efficiency and small size. Practical architectures, and algorithms are highlighted. more>>
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DSP Tricks: Reduce A/D Converter Quantization Noise - by Richard Lyons |
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To reduce or eliminate the ill effects of quantization noise in analog-to-digital (A/D) converters, . DSP practitioners can use two tricks to reduce converter quantization noise. Those schemes are called oversampling and dithering. Oversampling. The process of oversampling to reduce A/D converter quantization noise is straightforward. We merely sample an analog signal at an fs sample rate higher than the minimum rate needed to satisfy the Nyquist criterion (twice the analog signal's bandwidth), and then lowpass filter. What could be simpler?
Dithering is another technique used to minimize the effects of A/D quantization noise, dithering is the process of adding noise to our analog signal prior to A/D conversion. more>> |
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