Sine to square wave conversion

On 10/15/15 8:18 AM, Bob Masta wrote:
> On Wed, 14 Oct 2015 19:45:14 -0400, robert bristow-johnson
> <rbj@audioimagination.com>  wrote:
>
> <snip>
>
>> i have a different embarrassing trial (tried it during a rehearsal)
>> thinking that we could put a resistor pad on the speaker output of the
>> guitar amp instead of micing it.
>>
>> i thought fer sher it would work.
>
> OK, I'll bite:  What was the problem?

very loud hum.  it wasn't transformer isolated.


-- 

r b-j                  rbj@audioimagination.com

"Imagination is more important than knowledge."

Sharan123 <99077@dsprelated> wrote:
(someone wrote)
>>In some cases I do wonder why the term "filter" is applied.   "Filter"
>>tends to imply that something in the input gets passed while other
>>things in the input do not.   Is the idea that x(t) = sgn(sin(wt))
>>removes the amplitude information and lets everything else through?

(snip)

> To be frank, I have had the same doubt and I had put this question in this
> forum. A filter intuitively means that something is removed and something
> is not. But I realized that probably that was a shallow co-relation I was
> making about filters. After a bit of thinking, I assume filtering does not
> always mean removal of signal components but can also mean removal of
> things like noise. 

Do filters have to be linear in their removing?

A rectifier removes the bottom half of a sine, is that a filter?

Note that in doing the removing, it adds man frequency components?

There is an interesting field called non-linear optics, where
optical frequency signals go through non-linear devices, which includes
adding frequency components.
 
> So, if we use moving average as an example, the noise is reduced, though
> the power sort of gets distributed ... in this case, the noise is removed
> but the signal associated is not ...

-- glen

On 2015-10-16 00:38, gyansorova@gmail.com wrote:
[...]
> That is not a filter. A filter performs some form of convolution in the traditional sense. You can get multiplicative filtering of course for multiplicative noise.

Of course, we can go forever replying each
other "it's a filter", "no, it's not".

What I'm writing here is that "filter" as
"convolution" (as you write) is only a
narrow view of the concept.

BTW, I'm not even sure an IIR is a convolution
in a "traditional" sense (on the other hand,
who knows what "traditional" means...).

Many people, in different, but close, fields,
define "filter" as a much broader tool.

As I mentioned, there is a "median filter",
which does not convolve anything, strictly.
Nevertheless, it's called "filter".

bye,

-- 

piergiorgio

>If we were getting drunk at a university bar I'd make a bet with you
>that it's filtering, just for the joy of arguing.

Linear filters are boring anyways. To quote my professor, "everything is a
filter. This room is a filter. I'm a filter. You're a filter."



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>On 2015-10-16 00:38, gyansorova@gmail.com wrote:
>[...]
>> That is not a filter. A filter performs some form of convolution in
the
>traditional sense. You can get multiplicative filtering of course for
>multiplicative noise.
>
>Of course, we can go forever replying each
>other "it's a filter", "no, it's not".
>
>What I'm writing here is that "filter" as
>"convolution" (as you write) is only a
>narrow view of the concept.
>
>BTW, I'm not even sure an IIR is a convolution
>in a "traditional" sense (on the other hand,
>who knows what "traditional" means...).
>
>Many people, in different, but close, fields,
>define "filter" as a much broader tool.
>
>As I mentioned, there is a "median filter",
>which does not convolve anything, strictly.
>Nevertheless, it's called "filter".
>
>bye,
>
>-- 
>
>piergiorgio

Just to add to the silly list of filters. A wire causes delay and so is a
filter.

Bye (Piergiorgio Sartor)

Kaz
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