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Old 5th October 2004, 10:40 PM   #11
Eva is offline Eva  Spain
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The most usual way to accomplish volume, balance, fader, bass, mid, trebble, surround, louness, equalizer, etc..., in cheap consumer electronics are hybrid analog/digital ICs. These ICs are intended to be controlled by a main microcontroller through a simple digital bus and provide steppped adjustments [not continuous]. They are based in analog filters with switched-resistor networks and sometimes also in switched-capacitor filters. These ICs are designed to minimize external component count so nearly everything is inside the IC except the capacitors

These cheap hybrid ICs may be found inside most 'potentiometer-less' consumer equipment, despite they usually provide high THD, high noise and low headroom

Some consumer equipment with both analog and digital inputs and/or outputs is actually based on classic analog signal processing with DACs and ADCs in front of it
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Old 7th October 2004, 12:38 AM   #12
advan is offline advan  United States
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I don't want todesign and build a complete system, I just want to alter the programming characteristics of a processer. Does anyone know of any companies that sell DSP chips.
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Old 7th October 2004, 10:38 AM   #13
sss is offline sss  Israel
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www.ti.com
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Old 9th October 2004, 01:37 AM   #14
advan is offline advan  United States
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Thanks for the info. I am currently in process of purchacing a development kit from IT. I have a question though. Features like Dolby, DTS, Lucasfilm THX, from my understanding are programs and not actual circuitry. Is this true. Thanks
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Old 9th October 2004, 12:03 PM   #15
MikeB is offline MikeB  Germany
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Principally you are right. DTS and DolbyDigital are codecs, means
you need an algorithm to decode these streams. THX is a certification,
given if your system fulfills a minimum of requirements, and you have enough money...
You can't decode DTS/DD/MPEG without any kind of processor/cpu,
typically these are embedded chips with digital in + dsp + analog out/
digital out. Some of these can be reprogrammed, means the software/
firmware needs to be loaded into these at startup. Others have ROM
inside, eliminating the need for an extra cpu.
You might understand now, why i think that this is above DIY.
You need lowlevelprogramming, maybe even DSP-programming. And
you don't get easily specs for DTS and DD-decoding, you are required
to obtain sub-expensive licences. If you buy an embedded chip, you
might have luck to obtain these licences along with the chip.
You might be able to solder together all these chips, but without
apropriate firmware these might be some useless circuitry.

Mike
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Old 9th October 2004, 01:54 PM   #16
sss is offline sss  Israel
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advan if u wanna make a dolby decoder i think u should take one from an old reciever or something , otherwise it costs allot of money - not for a DIYer
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Old 9th October 2004, 09:26 PM   #17
advan is offline advan  United States
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I have an idea for sound processing and learned that with the use a DSP chip it would be possible. Although if the chips are already being produced and are controlled by programming, it would be the programming that needs to be patented and not the circuitry. Thank you every one for the valuble information.
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