How can I measure jitter?
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How can I measure jitter?
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Boki
Guest
Posted: Tue Nov 29, 2005 5:35 pm    Post subject: How can I measure jitter? Reply with quote
How can I measure jitter?

I have to measure Bluetooth jitter, could you please advice the device and
method...


Best regards,
Boki.

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PeteS
Guest
Posted: Wed Nov 30, 2005 1:35 am    Post subject: Re: How can I measure jitter? Reply with quote
Boki wrote:
Quote:
How can I measure jitter?

I have to measure Bluetooth jitter, could you please advice the device and
method...


Best regards,
Boki.

What jitter? What chipset? Are you trying to measure jitter in the
transported signal, or in the carrier?
The jitter of the RF generator?
Then we get to:
Long term jitter (drift), cycle to cycle jitter (much more difficult
but do-able, depending on the frequency of the signal you are
measuring), deterministic jitter (predictable using a network analyzer
or even a diff TDR) - the list goes on.

Please try and be more precise as to what it is you are trying to
measure.

Cheers

PeteS
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Pooh Bear
Guest
Posted: Wed Nov 30, 2005 9:35 am    Post subject: Re: How can I measure jitter? Reply with quote
PeteS wrote:

Quote:
Boki wrote:
How can I measure jitter?

I have to measure Bluetooth jitter, could you please advice the device and
method...


Best regards,
Boki.

What jitter? What chipset? Are you trying to measure jitter in the
transported signal, or in the carrier?
The jitter of the RF generator?
Then we get to:
Long term jitter (drift), cycle to cycle jitter (much more difficult
but do-able, depending on the frequency of the signal you are
measuring), deterministic jitter (predictable using a network analyzer
or even a diff TDR) - the list goes on.

Please try and be more precise as to what it is you are trying to
measure.

I'll bet he means jitter on an audio signal transported over Bluetooth but Boki
likes to evade asking a question directly.

Graham

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PeteS
Guest
Posted: Wed Nov 30, 2005 9:35 am    Post subject: Re: How can I measure jitter? Reply with quote
Quote:
I'll bet he means jitter on an audio signal transported over Bluetooth but Boki
likes to evade asking a question directly.

Graham

That's what I figure. As you note, Boki has a hard time formulating a
decent question. I consider it my teaching duty to nag him ;)

Cheers

PeteS
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Don Bowey
Guest
Posted: Wed Nov 30, 2005 5:35 pm    Post subject: Re: How can I measure jitter? Reply with quote
On 11/29/05 8:02 PM, in article 438D244C.76F5E4BB@hotmail.com, "Pooh Bear"
<rabbitsfriendsandrelations@hotmail.com> wrote:

Quote:


PeteS wrote:

Boki wrote:
How can I measure jitter?

I have to measure Bluetooth jitter, could you please advice the device and
method...


Best regards,
Boki.

What jitter? What chipset? Are you trying to measure jitter in the
transported signal, or in the carrier?
The jitter of the RF generator?
Then we get to:
Long term jitter (drift), cycle to cycle jitter (much more difficult
but do-able, depending on the frequency of the signal you are
measuring), deterministic jitter (predictable using a network analyzer
or even a diff TDR) - the list goes on.

Please try and be more precise as to what it is you are trying to
measure.

I'll bet he means jitter on an audio signal transported over Bluetooth but
Boki
likes to evade asking a question directly.

Graham


There is no "audio signal" transported on Bluetooth.

Boki likes to make cryptic posts, which are best ignored.

Don
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Guest
Posted: Thu Dec 01, 2005 7:47 am    Post subject: Re: How can I measure jitter? Reply with quote
Clock jitter. : )

It is using a 48 MHz internal clock; this gives a jitter of ~21ns.
Using a 4 MHz internal clock and have a higher jitter of 250 ns.

Please advice the clock jitter measure method.

Best regards,
Boki.
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Guest
Posted: Thu Dec 01, 2005 7:49 am    Post subject: Re: How can I measure jitter? Reply with quote
Nice smell.
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Guest
Posted: Thu Dec 01, 2005 8:02 am    Post subject: Re: How can I measure jitter? Reply with quote
= =

....................


= =

no your business...
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Pooh Bear
Guest
Posted: Thu Dec 01, 2005 5:14 pm    Post subject: Re: How can I measure jitter? Reply with quote
Don Bowey wrote:

Quote:
On 11/29/05 8:02 PM, in article 438D244C.76F5E4BB@hotmail.com, "Pooh Bear"
rabbitsfriendsandrelations@hotmail.com> wrote:



PeteS wrote:

Boki wrote:
How can I measure jitter?

I have to measure Bluetooth jitter, could you please advice the device and
method...


Best regards,
Boki.

What jitter? What chipset? Are you trying to measure jitter in the
transported signal, or in the carrier?
The jitter of the RF generator?
Then we get to:
Long term jitter (drift), cycle to cycle jitter (much more difficult
but do-able, depending on the frequency of the signal you are
measuring), deterministic jitter (predictable using a network analyzer
or even a diff TDR) - the list goes on.

Please try and be more precise as to what it is you are trying to
measure.

I'll bet he means jitter on an audio signal transported over Bluetooth but
Boki
likes to evade asking a question directly.

Graham


There is no "audio signal" transported on Bluetooth.

There is if you happen to use Bluetooth to do that.

Bluetooth is multi-function.

Graham
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Anthony Fremont
Guest
Posted: Fri Dec 02, 2005 1:35 am    Post subject: Re: How can I measure jitter? Reply with quote
"Don Bowey" <dbowey@comcast.net> wrote

Quote:
There is no "audio signal" transported on Bluetooth.

Really? Are you sure about that?

Quote:
Boki likes to make cryptic posts, which are best ignored.

Don
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PeteS
Guest
Posted: Fri Dec 02, 2005 1:35 am    Post subject: Re: How can I measure jitter? Reply with quote
Don Bowey wrote:

Quote:

There is no "audio signal" transported on Bluetooth.

Boki likes to make cryptic posts, which are best ignored.

Don

I agree on the cryptic posts.

Bluetooth does, in a way, carry audio. It is designed to pass PCM, 8k
frame rate - standard telecom style digitised audio. Indeed, I am using
bluetooth links with this specifically in mind (amongst other things)
in commercial products.
Certainly one could pass any arbitrary data on this (SCO) link with
decent QoS, but it was designed specifically for audio. The data are
retimed at each end, so any jitter analysis would be pretty meaningless
from a pure signalling perspective, without knowing the limits of
retiming.

Boki does seem to reply further down, but has yet to specify clearly
the question :)

Cheers

PeteS
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PeteS
Guest
Posted: Fri Dec 02, 2005 1:35 am    Post subject: Re: How can I measure jitter? Reply with quote
bokiteam@ms21.hinet.net wrote:
Quote:
Clock jitter. : )

It is using a 48 MHz internal clock; this gives a jitter of ~21ns.
Using a 4 MHz internal clock and have a higher jitter of 250 ns.

Please advice the clock jitter measure method.

Best regards,
Boki.

If you are asking how to measure the jitter, how do you know you have
the jitter you have stated?

Where, in the system, are you measuring this jitter? Against what
reference? On what signal?
As I said above, state the problem more clearly, please

Cheers

PeteS
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Jasen Betts
Guest
Posted: Sat Dec 03, 2005 1:26 pm    Post subject: Re: How can I measure jitter? Reply with quote
On 2005-12-01, Anthony Fremont <spam@anywhere.com> wrote:
Quote:

"Don Bowey" <dbowey@comcast.net> wrote

There is no "audio signal" transported on Bluetooth.

Really? Are you sure about that?

They use something like that for wireless headsets.

Bye.
Jasen
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Guest
Posted: Sat Dec 03, 2005 5:35 pm    Post subject: Re: How can I measure jitter? Reply with quote
The bluetooth data exchange has some delay, I am confused that is
software problem or hardware problem, I consider both

For hardware, I think I have to check jitter, or DSP will request to
retry the data communication.


Best regards,
Boki
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Don Bowey
Guest
Posted: Sun Dec 04, 2005 1:35 am    Post subject: Re: How can I measure jitter? Reply with quote
On 12/2/05 11:26 PM, in article c8a.439148ae.db87e@clunker.homenet, "Jasen
Betts" <jasen@free.net.nospam.nz> wrote:

Quote:
On 2005-12-01, Anthony Fremont <spam@anywhere.com> wrote:

"Don Bowey" <dbowey@comcast.net> wrote

There is no "audio signal" transported on Bluetooth.

Really? Are you sure about that?

They use something like that for wireless headsets.

Bye.
Jasen

"Something like that" gets used for lots of things. But maybe what you are
thinking of is something like Bluetooth transporting a digital bit-stream of
encoded audio.
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