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Brakeshoe
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re: The Sound of Innovation at Cochlear Limited
Brakeshoe   8/17/2011 9:27:51 AM
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Unfortunately, Cochlear has refused to properly space their electrodes, trying to jam 24 contacts (22 + 2 grounds) on the inch-long array into the pea-sized hearing organ. Because of this, channel crossover is a problem, where a given electrode stimulates the wrong part of the spiral ganglion, causing all sorts of problems. For a description, see: Cochlear Implant Channel Crossover: First Person Report at: http://thehearingblog.com/archives/205 Then, to see how deafness f*cked with the wrong guy, check out how Mike Marzalek did it at: http://www.CItheory.com Be sure to go to his biography page; and also do a patent search for his name.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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