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Discussion of precise time and frequency measurement

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Re: [time-nuts] wifi with time sync

J
jimlux
Sun, Jan 15, 2017 2:35 PM

On 1/15/17 6:27 AM, Bob Camp wrote:

Hi

Again, this is why the interest in “how the heck did they accomplish it?
With the claim of microsecond level performance, they must have run
into all these issues.

or is it "with these two specific WiFi adapters in this specific
environment, we were able to achieve microsecond level performance, and
who knows if it's generalizable"

On 1/15/17 6:27 AM, Bob Camp wrote: > Hi > > > Again, this is why the interest in “how the heck did they accomplish it? > With the claim of microsecond level performance, they must have run > into all these issues. or is it "with these two specific WiFi adapters in this specific environment, we were able to achieve microsecond level performance, and who knows if it's generalizable"
BC
Bob Camp
Sun, Jan 15, 2017 2:50 PM

Hi

The push behind this is whole house audio. These guys want to be able to set up WiFi
speakers / mic's all through a home and get proper audio imaging in each room. They likely
also want to use it to figure out which mic you are talking to using time of arrival. They very
much want to do this in real environments (300 WiFi nets in the building). Since they want to
roll it out that way, it’s got to be cheap and fairly robust. They need their gizmo to work with
the infrastructure you already have.

Bob

On Jan 15, 2017, at 9:35 AM, jimlux jimlux@earthlink.net wrote:

On 1/15/17 6:27 AM, Bob Camp wrote:

Hi

Again, this is why the interest in “how the heck did they accomplish it?
With the claim of microsecond level performance, they must have run
into all these issues.

or is it "with these two specific WiFi adapters in this specific environment, we were able to achieve microsecond level performance, and who knows if it's generalizable"


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Hi The push behind this is whole house audio. These guys want to be able to set up WiFi speakers / mic's all through a home and get proper audio imaging in each room. They likely also want to use it to figure out which mic you are talking to using time of arrival. They very much want to do this in real environments (300 WiFi nets in the building). Since they want to roll it out that way, it’s got to be cheap and fairly robust. They need their gizmo to work with the infrastructure you already have. Bob > On Jan 15, 2017, at 9:35 AM, jimlux <jimlux@earthlink.net> wrote: > > On 1/15/17 6:27 AM, Bob Camp wrote: >> Hi >> >> >> Again, this is why the interest in “how the heck did they accomplish it? >> With the claim of microsecond level performance, they must have run >> into all these issues. > > or is it "with these two specific WiFi adapters in this specific environment, we were able to achieve microsecond level performance, and who knows if it's generalizable" > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.
"G
"Björn Gabrielsson"
Sun, Jan 15, 2017 3:05 PM

Hi Bob,

Below are some efforts to reduce buffering in both routers and non router
network stacks including wifi. They are focusing on reducing latency -
maybe some is relevant for you.

https://www.bufferbloat.net/projects/make-wifi-fast/wiki/
https://wiki.openwrt.org/doc/howto/sqm
https://www.bufferbloat.net/projects/bloat/wiki/Windows_Tips/

--

Björn
Hi Bob, Below are some efforts to reduce buffering in both routers and non router network stacks including wifi. They are focusing on reducing latency - maybe some is relevant for you. https://www.bufferbloat.net/projects/make-wifi-fast/wiki/ https://wiki.openwrt.org/doc/howto/sqm https://www.bufferbloat.net/projects/bloat/wiki/Windows_Tips/ -- Björn
D
David
Mon, Jan 16, 2017 8:22 PM

Sonos and I guess their competitors do this by dropping WiFi
compatibility.  They exist on their own network in the same ISM band
so I wonder how well they coexist with WiFi.  Online reports say
poorly under crowded band conditions.

On Sun, 15 Jan 2017 09:50:05 -0500, you wrote:

Hi

The push behind this is whole house audio. These guys want to be able to set up WiFi
speakers / mic's all through a home and get proper audio imaging in each room. They likely
also want to use it to figure out which mic you are talking to using time of arrival. They very
much want to do this in real environments (300 WiFi nets in the building). Since they want to
roll it out that way, it’s got to be cheap and fairly robust. They need their gizmo to work with
the infrastructure you already have.

Bob

Sonos and I guess their competitors do this by dropping WiFi compatibility. They exist on their own network in the same ISM band so I wonder how well they coexist with WiFi. Online reports say poorly under crowded band conditions. On Sun, 15 Jan 2017 09:50:05 -0500, you wrote: >Hi > >The push behind this is whole house audio. These guys want to be able to set up WiFi >speakers / mic's all through a home and get proper audio imaging in each room. They likely >also want to use it to figure out which mic you are talking to using time of arrival. They very >much want to do this in real environments (300 WiFi nets in the building). Since they want to >roll it out that way, it’s got to be cheap and fairly robust. They need their gizmo to work with >the infrastructure you already have. > >Bob