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advan 2nd October 2004 09:07 PM

bass & trebble
in a surround sound receiver where in the circuit is the circuitry for adjusting bass and trebble, what components are used to adjust these.

MikeB 3rd October 2004 06:52 PM

You could have asked: "Where on the earth is the ocean ?"

There are so many different ways to do this...
Some will use IIR-Filters inside the dsp, means fully digital, other
might use opamps. Are the settings done via a pot (turning knob)
or by pressing some +/- ?
In the case of opamps, there could be an IC with 8pins or 16pins,
around of it some caps and resistors...


advan 3rd October 2004 07:44 PM

I am no electronics geniouse just trying to find out a little information. So in a new surrond sound receiver for instance where there are no bass and trebble knobs what type of circuitr controls this and in what manner is it controlledand even going a little deeper, if it is controlled by a processer how is the procesor programmed. ? whst type of software and is the an industry standard on the software used to program chips? procesors? Sorry about the lack of knowledge but any help would be greatly appreciated.

Enzo 3rd October 2004 08:33 PM

How long is a piece of string?

johnnyx 3rd October 2004 09:00 PM

The design by Peter Baxandall is the most famous. Google the name and you get quite a few links to try.

advan 3rd October 2004 09:51 PM

Very interesting thanks for the info. but in an surrond sound receiver with digital audio inputs what kind of circuit adjusts and or controls tone control.

jaycee 5th October 2004 12:55 AM

It is highly likely this is done inside a Digitial Signal Processor (DSP) IC in the surround reciever. Typically these are programmed in an assembly language form. They may be controlled by a seperate Microcontroller IC but nowadays DSP's are coming with microcontrollers built in.

As for *exactly* how it's implemented, well there are numerous ways of doing it, so it depends how the manufacturer in question has chosen to achieve that particular task. In many cases, the firmware (software embedded in the DSP hardware) is proprietary.

Typically the chip firmware is programmed in using a protocol known as JTAG, it may be possible to read the firmware out again using the same protocol but thats very advanced and may even be illegal to do so in some cases.

advan 5th October 2004 01:05 AM

Is it possible to to purchase a DSP chip and program it with certain characteristics. If so where would you purchase this chip and what kind of harware would be required to program it.

MikeB 5th October 2004 03:27 PM

I think that's a bit above DIY. Assembling and programming a fully
functional DSP-system ? Don't forget, it's a sophisiticated Microcomputer !


audiofan 5th October 2004 07:06 PM

you may look at this program to desing discrete tone stack

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