# Delay line

**URL:** <https://www.ruby-forum.com/t/delay-line/238879>\
**Category:** GNU Radio\
**Created:** [February 2, 2014, 2:06pm UTC](https://www.ruby-forum.com/t/delay-line/238879 "2014-02-02T14:06:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [February 2, 2014, 2:06pm UTC](https://www.ruby-forum.com/t/delay-line/238879/1 "2014-02-02T14:06:15Z")

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Dear Sir  
I created a C++ sync block and inserted

out[i]=in[i-100]  
I wanted to get 100th earliest sample continuously.  
It worked. But I wanted to know will this correct when it connected to a  
source continuously.  
Thanks  
Neil

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**Author:** ![MHMND\_Herath](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ecccb3/32.png) [@MHMND\_Herath](https://www.ruby-forum.com/u/MHMND_Herath)\
**Post date:** [February 2, 2014, 2:07pm UTC](https://www.ruby-forum.com/t/delay-line/238879/2 "2014-02-02T14:07:25Z")

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On 02.02.2014 14:14, MHMND Herath wrote:

> Dear Sir  
> I created a C++ sync block and inserted
> 
> ```
> out[i]=in[i-100]
> 
> ```
> 
> I wanted to get 100th earliest sample continuously.  
> It worked. But I wanted to know will this correct when it connected to a  
> source continuously.  
> Thanks  
> Neil

You probably want to use the blocks.delay() block here.

MB

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**Author:** ![MHMND\_Herath](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ecccb3/32.png) [@MHMND\_Herath](https://www.ruby-forum.com/u/MHMND_Herath)\
**Post date:** [February 3, 2014, 12:14am UTC](https://www.ruby-forum.com/t/delay-line/238879/3 "2014-02-03T00:14:20Z")

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Yes, it will.  
The GNU Radio scheduler calls your block’s work() function whenever it  
needs new data.

Anyway, this is a very basic principle of GR; I recommend working  
through the “creating an OOT module” tutorial, it’s really great!

Greetings,  
Marcus

On 02.02.2014 14:14, MHMND Herath wrote:

> mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)

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<div class="post-metadata">

**Author:** ![MHMND\_Herath](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ecccb3/32.png) [@MHMND\_Herath](https://www.ruby-forum.com/u/MHMND_Herath)\
**Post date:** [February 3, 2014, 12:20am UTC](https://www.ruby-forum.com/t/delay-line/238879/4 "2014-02-03T00:20:45Z")

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Forgot to mention: You must call the set\_history() function accordingly!

On 03.02.2014 00:13, Marcus M. wrote:

> \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ Discuss-gnuradio  
> mailing list [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)

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