[Discuss-gnuradio] Threshold Block (was: Re: Discuss-gnuradio Digest, Vol 165, Issue 21)

[Marcus Müller]

Dear Bala,

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What does threshold block does. If, i give constant source of amp=1 and set threshold low=-1 and high=-2. The output is still 1. I cant understand what the threshold block used for. Can anyone explain. Thank you 

The Threshold block generates 0 or 1.

If your current output state is 1, then your input must be below the "low" value to change to state 0.
If your current output state is 0, then your input must be above the "high" value to change to state 0.

Since your input is > high all the time, your output is always 1.

This is the behaviour of a Schmitt Trigger[1].

Best regards,
Marcus

[1] https://en.wikipedia.org/wiki/Schmitt_trigger

On 20.08.2016 18:07, bala vishnu wrote:

What does threshold block does. If, i give constant source of amp=1 and set threshold low=-1 and high=-2. The output is still 1. I cant understand what the threshold block used for. Can anyone explain. Thank you 

On Sat, Aug 20, 2016 at 9:30 PM, <address@hidden> wrote:

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Today's Topics:

   1. Re: [USRP-users] Is there any gnuradio block that will repeat
      two file sources a fixed number of times and is variable?
      (Chris Kuethe)


----------------------------------------------------------------------

Message: 1
Date: Fri, 19 Aug 2016 10:56:21 -0700
From: Chris Kuethe <address@hidden>
To: Martin Braun <address@hidden>
Cc: "address@hidden" <address@hidden>,
        "address@hidden" <address@hidden>
Subject: Re: [Discuss-gnuradio] [USRP-users] Is there any gnuradio
        block that will repeat two file sources a fixed number of times and is
        variable?
Message-ID:
        <CAGHP0pK=OTgDFtUAqgSKBGv_bz3h4=Qfk9rHwdNqcOAm-t17ew@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

You could use a "python block" or "python module" block to build an
appropriate replay block.

On Thu, Aug 18, 2016 at 1:24 PM, Martin Braun via USRP-users <
address@hidden> wrote:

> Craig,
>
> you might just want to read the files into Python and then use vector
> sources to generate any kind of signal you like.
>
> Cheers,
> M
>
> On 08/18/2016 07:49 AM, Swanson, Craig wrote:
> > ?Marcus,
> >
> > I have two file sources: pulse and no pulse (noise)
> >
> >
> > I want to use an interleaver to send a pulse file and then after that
> > just noise.
> >
> > But the interleaver will alternate file sources evenly.
> >
> >
> > I want to setup a parameter that allows the combination to vary.  Maybe
> > one time send five pulses, then three no pulses.  Then when I run the
> > python file again, send two pulses alternating with five no pulses.
> >
> >
> > Do you have a block like that?
> >
> >
> > Craig
> >
> >
> > *Craig F. Swanson*
> > */Research Engineer II
> > /*
> > */Information and Communications Laboratory/*
> > */Communications, Systems, and Spectrum Division/*
> > /Georgia Tech Research Institute/
> > /Room 560
> > 250 14th St NW
> > /
> > /Atlanta, GA 30318/
> > /Cell: 770.298.9156/
> > http://www.gtri.gatech.edu
> > <https://mail.gtri.gatech.edu/owa/redir.aspx?C=
> c20925f2f0af4dd29329ddf0701ecfff&URL="" moz-do-not-send="true" href="http://2fwww.gtri.gatech.edu" rel="noreferrer" target="_blank">2fwww.gtri.gatech.edu%2f>
> >
>
>
> _______________________________________________
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>



--
GDB has a 'break' feature; why doesn't it have 'fix' too?
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End of Discuss-gnuradio Digest, Vol 165, Issue 21
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--

With regards,

Bala vishnu.J,

Teaching Fellow,

Dept of Electronics and Communication Engineering,

Anna University(CEG),

Chennai-600025.

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