Digital filter simulators?

Joerg wrote:
> Hello Tim,
> 
>>
>> You should stick to "quantization" if you want us poor DSP types to 
>> understand.
>>
> 
> Ok, I'll try to be better in the future. Quantization it is. I guess 
> I'll also have to lose some other slang, apodization, CFAR and all that.

What is CFAR? Apodization is from the realm of optics, dealing with 
control of diffraction. The corresponding DSP term is windowing. The 
equivalence of diffraction patterns and side lobes doesn't immediately 
strike one, but of course they are in essence the same phenomenon.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

Tim Wescott wrote:

   ...

> We have a cable modem.  It really ticks my kid off that we don't also 
> have cable TV.

A buddy of mine has your setup, and the cable crews kept disconnecting 
him. He wasn't signed up for cable TV, so they figured it was an illegal 
tap. We finally climbed the pole and nailed a note to it near the drop.

Jerry
-- 
Engineering is the art of making what you want from things you can get.
�����������������������������������������������������������������������

Jerry Avins <jya@ieee.org> writes:

> What is CFAR? 

CFAR = Constant False Alarm Rate

It's a way of choosing thresholds based on how many false alarms your
system can deal with. Zero is not an option; something less than 99.9%
is easier to deal with.

Ciao,

Peter K.

Jerry Avins wrote:
> Joerg wrote:
> 
>> Hello Tim,
>>
>>>
>>> You should stick to "quantization" if you want us poor DSP types to 
>>> understand.
>>>
>>
>> Ok, I'll try to be better in the future. Quantization it is. I guess 
>> I'll also have to lose some other slang, apodization, CFAR and all that.
> 
> 
> What is CFAR? Apodization is from the realm of optics, dealing with 
> control of diffraction. The corresponding DSP term is windowing. The 
> equivalence of diffraction patterns and side lobes doesn't immediately 
> strike one, but of course they are in essence the same phenomenon.
> 
> Jerry

CFAR is term generally associated with radar and sonar. You want your 
radar to CFAR, don't you? So, you need a Constant False Alarm Rate 
device to control the rate of detections, and maximise sensitivity 
without flooding the system's back end with false alarms. Its a form of 
adaptive filter, though there are many variations on the basic theme.

Steve

Hello John,

> Around here, the cable company charges about $10 extra per month if you get 
> cable modem without some type of cable TV service.  The cheapest cable TV you 
> can get (basic service, which includes the local over-air channels and a few 
> extras) costs slightly more than $10.  So usually people opt to get the basic 
> service since it is essentially almost free.  But you can choose to pay the 
> extra $10 instead if you want.  In the hilly area I live in, over-air reception 
> can be bad to non-existent for many people even with a good antenna, so the 
> basic cable service is popular. 
> 

Very different here. They offer Internet for between $20 and $30 but w/o 
subscribing to their TV it's $55 or more IIRC. DSL is $50 so it's a 
better deal. No idea why the cable guys do that, I guess most people 
must have cable TV.

AFAIK the basic cable TV is already over $40. Not worth it IMHO. 
Terrestrial reception is spotty as we live in the hills. You can see 
ghosting over several lines, meaning the ghost image is vertically and 
horizontally separated. Sometimes you have to train your antenna on that 
ghost because it's more intelligible than the direct path. I could 
imagine that DTV will be a failure around here. Instead of a somewhat 
intelligible screen we might just see a garbled mess of data. Oh well, 
it won't be a great loss anyway.

Regards, Joerg

http://www.analogconsultants.com

Hello Jerry,

>> We have a cable modem.  It really ticks my kid off that we don't also 
>> have cable TV.
> 
> A buddy of mine has your setup, and the cable crews kept disconnecting 
> him. He wasn't signed up for cable TV, so they figured it was an illegal 
> tap. We finally climbed the pole and nailed a note to it near the drop.
> 

In California this might have required a bilingual note ;-)

I wonder, if they send most basic channels unscrambled how do they avoid 
somebody from tapping the line at the modem input and connect the TV to 
that?

Regards, Joerg

http://www.analogconsultants.com

Jerry Avins wrote:

> Tim Wescott wrote:
> 
>   ...
> 
>> We have a cable modem.  It really ticks my kid off that we don't also 
>> have cable TV.
> 
> 
> A buddy of mine has your setup, and the cable crews kept disconnecting 
> him. He wasn't signed up for cable TV, so they figured it was an illegal 
> tap. We finally climbed the pole and nailed a note to it near the drop.
> 
> Jerry

What! Cable employees that can read.
I hand delivered a note to local cable company giving formal notice that 
their sales people were to stay away from me of suffer civil and/or 
criminal penalties.

Before handing it over, I asked if the was anyone in the office who 
could read [with provocation I can be sarcastic ;]

I 'gentleman', identifying himself as OFFICE MANAGER, "I graduated from 
... {the local state university}."

I replied "But I asked if there was anyone who could read."
Haven't been bothered in last ten years ;}

"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:UaYpf.35338$dO2.12978@newssvr29.news.prodigy.net...
> Hello Jerry,
>
> >> We have a cable modem.  It really ticks my kid off that we don't also
> >> have cable TV.
> >
> > A buddy of mine has your setup, and the cable crews kept disconnecting
> > him. He wasn't signed up for cable TV, so they figured it was an illegal
> > tap. We finally climbed the pole and nailed a note to it near the drop.
> >
>
> In California this might have required a bilingual note ;-)
>
> I wonder, if they send most basic channels unscrambled how do they avoid
> somebody from tapping the line at the modem input and connect the TV to
> that?

This is why most cable providers (atleast here in San Jose, CA) make you pay
the $10 extra if you want only their cable modem services. They can't block
the basic cable content since it isn't scrambled. So if you subscribe to
their broadband services, you can tap into their basic channels.

Cheers
Bhaskar

>
> Regards, Joerg
>
> http://www.analogconsultants.com

Hello Bhaskar,

>>I wonder, if they send most basic channels unscrambled how do they avoid
>>somebody from tapping the line at the modem input and connect the TV to
>>that?
> 
> This is why most cable providers (atleast here in San Jose, CA) make you pay
> the $10 extra if you want only their cable modem services. They can't block
> the basic cable content since it isn't scrambled. So if you subscribe to
> their broadband services, you can tap into their basic channels.
> 

Well, I don't want TV. It isn't just $10 here, it's more like $40 and 
IMHO absolutely not worth it. Why can't they just filter the TV band out 
good enough so that the resulting picture quality after an illegal tap 
would be miserable?

Regards, Joerg

http://www.analogconsultants.com

Bhaskar Thiagarajan wrote:

>"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
>news:UaYpf.35338$dO2.12978@newssvr29.news.prodigy.net...
>  
>
>>Hello Jerry,
>>
>>    
>>
>>>>We have a cable modem.  It really ticks my kid off that we don't also
>>>>have cable TV.
>>>>        
>>>>
>>>A buddy of mine has your setup, and the cable crews kept disconnecting
>>>him. He wasn't signed up for cable TV, so they figured it was an illegal
>>>tap. We finally climbed the pole and nailed a note to it near the drop.
>>>
>>>      
>>>
>>In California this might have required a bilingual note ;-)
>>
>>I wonder, if they send most basic channels unscrambled how do they avoid
>>somebody from tapping the line at the modem input and connect the TV to
>>that?
>>    
>>
>
>This is why most cable providers (atleast here in San Jose, CA) make you pay
>the $10 extra if you want only their cable modem services. They can't block
>the basic cable content since it isn't scrambled. So if you subscribe to
>their broadband services, you can tap into their basic channels.
>
>Cheers
>Bhaskar
>  
>
So, if they are charging you the full value of the basic unscrambled 
channels, what are they charging the other $9.98 for? :-)

Mary Christ'sMa
Steve

>  
>
>>Regards, Joerg
>>
>>http://www.analogconsultants.com
>>    
>>