PAL SIGNAL

I am doing a PAL signal generation project using atmega8.I need to know
exact timing chart.ie Where do I give sync pulse,vertical pulse and
other things??

On 23 Jun 2006 08:35:43 -0700, in comp.arch.embedded "palli"
<naveendavisv@gmail.com> wrote:

>I am doing a PAL signal generation project using atmega8.I need to know
>exact timing chart.ie Where do I give sync pulse,vertical pulse and
>other things??

Google?

http://www.epanorama.net/documents/video/pal_timing.html




martin

On 23 Jun, in article
     <1151076942.989647.155560@c74g2000cwc.googlegroups.com>
     naveendavisv@gmail.com "palli" wrote:

>I am doing a PAL signal generation project using atmega8.I need to know
>exact timing chart.ie Where do I give sync pulse,vertical pulse and
>other things??

I would say google for PAL timing should return plenty of hits and then
depending on which country and type of PAL timing you are trying to match.
PAL exists in many flavours from A to I and M for the main ones, some of the
differences are to do with sound and transmission, others are to do with
important things like sub-carrier frequency.

I personally would use a small CPLD for signal generation and not a micro
in the first place.

-- 
Paul Carpenter          | paul@pcserviceselectronics.co.uk
<http://www.pcserviceselectronics.co.uk/>    PC Services
<http://www.gnuh8.org.uk/>              GNU H8 & mailing list info
<http://www.badweb.org.uk/>             For those web sites you hate

palli wrote:

> I am doing a PAL signal generation project using atmega8.I need to know
> exact timing chart.ie Where do I give sync pulse,vertical pulse and
> other things??

Google is a good start, and also the Philips Video ICs : devices like 
teletext will have full PAL frame info.

  I presume you do not want true PAL (colour information, phase encoded 
on the 4.433Mhz colour) : that's beyond a Mega8.

  But just the composite sync signals, and some lowser frequency 
luminance should be do-able.

-jg

Paul Carpenter scrobe on the papyrus:

> On 23 Jun, in article
>      <1151076942.989647.155560@c74g2000cwc.googlegroups.com>
>      naveendavisv@gmail.com "palli" wrote:
> 
> > I am doing a PAL signal generation project using atmega8.I need to
> > know exact timing chart.ie Where do I give sync pulse,vertical
> > pulse and other things??
> 
> I would say google for PAL timing should return plenty of hits and
> then depending on which country and type of PAL timing you are trying
> to match.  PAL exists in many flavours from A to I and M for the main
> ones, some of the differences are to do with sound and transmission,
> others are to do with important things like sub-carrier frequency.
> 
> I personally would use a small CPLD for signal generation and not a
> micro in the first place.

Not forgetting the very quaint PAL N, with three lines of equalising
and serration pulses, as used in Uruguay & Paraguay!!!

-- 
John B

On Sat, 24 Jun 2006 08:31:54 +1200, Jim Granville wrote:

>  But just the composite sync signals, and some lowser frequency 
>luminance should be do-able.

Here's an example of such project: http://rk86.com/frolov/vi_frs.htm

On 23 Jun, in article <4g346fF1lgp3qU1@individual.net>
     spamj_baraclough@blockerzetnet.co.uk "John B" wrote:

>Paul Carpenter scrobe on the papyrus:
>
>> On 23 Jun, in article
>>      <1151076942.989647.155560@c74g2000cwc.googlegroups.com>
>>      naveendavisv@gmail.com "palli" wrote:
>> 
>> > I am doing a PAL signal generation project using atmega8.I need to
>> > know exact timing chart.ie Where do I give sync pulse,vertical
>> > pulse and other things??
>> 
>> I would say google for PAL timing should return plenty of hits and
>> then depending on which country and type of PAL timing you are trying
>> to match.  PAL exists in many flavours from A to I and M for the main
>> ones, some of the differences are to do with sound and transmission,
>> others are to do with important things like sub-carrier frequency.
>> 
>> I personally would use a small CPLD for signal generation and not a
>> micro in the first place.
>
>Not forgetting the very quaint PAL N, with three lines of equalising
>and serration pulses, as used in Uruguay & Paraguay!!!

Well I did say the "the main ones", comparing total population (hence
potential number PAL-N devices) of Paraguay and Uruguay to say Brazil
(PAL-M) would show what I mean for 'main ones'. I would not be surprised
if they used a variety of equipment depending which country they were
nearest in border regions and could import cheaply.

For many years in France it was easier to set up small video studios
in PAL-M and transcode to SECAM for final recording/transmission.
This was before everybody changed to component then digital and of
course multi-standard encoders/decoder chips.

-- 
Paul Carpenter          | paul@pcserviceselectronics.co.uk
<http://www.pcserviceselectronics.co.uk/>    PC Services
<http://www.gnuh8.org.uk/>              GNU H8 & mailing list info
<http://www.badweb.org.uk/>             For those web sites you hate

Paul Carpenter scrobe on the papyrus:

.
. 
> For many years in France it was easier to set up small video studios
> in PAL-M and transcode to SECAM for final recording/transmission.
> This was before everybody changed to component then digital and of
> course multi-standard encoders/decoder chips.

Probably not PAL-M as that's 525. I was in the Thomson CSF studio in
Rennes in the late 70's and it was PAL throughout with only a SECAM
encoder on the studio output. The French control rooms had a style that
even the Beeb couldn't match, so much space and the wonderful smell of
coffee and croissants everywhere!!

-- 
John B

On 24 Jun, in article <4g5b0jF1kb21tU1@individual.net>
     spamj_baraclough@blockerzetnet.co.uk "John B" wrote:

>Paul Carpenter scrobe on the papyrus:
>
>.
>. 
>> For many years in France it was easier to set up small video studios
>> in PAL-M and transcode to SECAM for final recording/transmission.
>> This was before everybody changed to component then digital and of
>> course multi-standard encoders/decoder chips.
>
>Probably not PAL-M as that's 525. I was in the Thomson CSF studio in

Damn meant PAL-I .

Even though PAL-M is just plain weird.
 
>Rennes in the late 70's and it was PAL throughout with only a SECAM
>encoder on the studio output. The French control rooms had a style that
>even the Beeb couldn't match, so much space and the wonderful smell of
>coffee and croissants everywhere!!

Last I dealt with anything like that was late 80's and same then as to
get equipment for SECAM then was so expensive for them. Even from French
manufacturers.

-- 
Paul Carpenter          | paul@pcserviceselectronics.co.uk
<http://www.pcserviceselectronics.co.uk/>    PC Services
<http://www.gnuh8.org.uk/>              GNU H8 & mailing list info
<http://www.badweb.org.uk/>             For those web sites you hate

Paul Carpenter scrobe on the papyrus:

.
. 
> Last I dealt with anything like that was late 80's and same then as to
> get equipment for SECAM then was so expensive for them. Even from
> French manufacturers.

I think there were only two manufacturers of true SECAM mixers. Thomson
and Cox. Thomson made a killing in Russia as they decided to go SECAM
for some strange reason (probably something to do with arms trading no
doubt) and Mike Cox would always go where no one else would dare to
tread.

-- 
John B