Re: [music-dsp] basic in-store speaker evaluation

[Stefan Sullivan]

It would be difficult to control for things like the time-varying behavior
of the audio processing on the phone, as well as the nonlinearities of the
same audio processing on the phone, not to mention the environmental noise
in the store, which would confound both of these behaviors. The audio
engineering approach would be to just play back pink noise, but that
involves training your ears to know what to expect. I don't know any
resources to train your ears for this kind of thing off the top of my head,
but I definitely recall learning about some apps/websites that could help
you at AES a few years ago. Maybe some others on this list know of
something?

Stefan


On Jul 4, 2017 8:54 AM, "Sampo Syreeni"  wrote:

> On 2017-07-04, Andy Farnell wrote:
>
> Something in the vein of "just put in a test DVD-A, and let your Android
>>> app run"?
>>>
>>
>> DVD? Maybe in 2000. Not knowing the playback capabilities at the store
>> you'd be better to put the test files online, in a spotify or soundcloud
>> channel.
>>
>
> Granted...if you could just drop something like eight channel FLAC's in
> and have them work out of the box on any and all of your setups.
>
> I too thoroughly hate the standardization that DVD-A never was. But you'll
> have to agree there's one thing which speaks for it: choosing the proper
> rates and channel counts, every little bit of variance has been certified
> and test out of the system. It *does* work out of the box, unlike so many
> newer file based systems.
>
> The room and listening position will be variables, needs factoring out
>> clientside, so quite a bit of DSP on the mobile.
>>
>
> Not perhaps on the mobile; let the mobile just work as the pickup, and
> stream the result back to something more workstation-like.
>
> Obviously you couldn't help your phone's pickup being uneven, that
>>>
>>
>> You need to know the phone, the app must do a client detect and
>> look up a database because there are large variances between
>> devices.
>>
>
> If you're only doing comparisons, you don't need that.
> --
> Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
> +358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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Re: [music-dsp] basic in-store speaker evaluation

[Sampo Syreeni]

On 2017-07-04, Andy Farnell wrote:

Something in the vein of "just put in a test DVD-A, and let your 
Android app run"?


DVD? Maybe in 2000. Not knowing the playback capabilities at the store
you'd be better to put the test files online, in a spotify or soundcloud
channel.


Granted...if you could just drop something like eight channel FLAC's in 
and have them work out of the box on any and all of your setups.


I too thoroughly hate the standardization that DVD-A never was. But 
you'll have to agree there's one thing which speaks for it: choosing the 
proper rates and channel counts, every little bit of variance has been 
certified and test out of the system. It *does* work out of the box, 
unlike so many newer file based systems.


The room and listening position will be variables, needs factoring out 
clientside, so quite a bit of DSP on the mobile.


Not perhaps on the mobile; let the mobile just work as the pickup, and 
stream the result back to something more workstation-like.



Obviously you couldn't help your phone's pickup being uneven, that


You need to know the phone, the app must do a client detect and
look up a database because there are large variances between
devices.


If you're only doing comparisons, you don't need that.
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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Re: [music-dsp] basic in-store speaker evaluation

[Andy Farnell]

On Tue, Jul 04, 2017 at 01:17:49PM +0300, Sampo Syreeni wrote:
> Is there an extant software out there which lets me do comparisons
> between various speaker sets? 

Its a good idea.

> Something in the vein of "just put in
> a test DVD-A, and let your Android app run"?

DVD? Maybe in 2000. Not knowing the playback capabilities at the store
you'd be better to put the test files online, in a spotify or soundcloud
channel.

> magnitude, and a bunch of synch signals, in some reasonable
> combination. So that you could at least in theory do synchronous
> detection of whatever you hear from your test DVD-A, simply by
> listening to it via your phone.

The room and listening position will be variables, needs factoring 
out clientside, so quite a bit of DSP on the mobile.

> Obviously you couldn't help your phone's pickup being uneven, that

You need to know the phone, the app must do a client detect and
look up a database because there are large variances between
devices.

cheers,
Andy



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Re: [music-dsp] basic in-store speaker evaluation

[STEFFAN DIEDRICHSEN]

Hi Sampo, 

https://www.faberacoustical.com/apps/ios/ 


It’s on iOS, not Android, but it’s a “portable” solution. And you don’t need a 
DVD player. ;-)


Steffan 


> On 04.07.2017|KW27, at 12:17, Sampo Syreeni  wrote:
> 
> Is there an extant software out there which lets me do comparisons between 
> various speaker sets? Something in the vein of "just put in a test DVD-A, and 
> let your Android app run"?
> 
> I mean, something like that ought to be doable per se. You'd just record your 
> normal test signals such as an MLS noise of known characteristic, a 1kHz sine 
> wave, a set of linear chirps of growing magnitude, and a bunch of synch 
> signals, in some reasonable combination. So that you could at least in theory 
> do synchronous detection of whatever you hear from your test DVD-A, simply by 
> listening to it via your phone.
> 
> Obviously you couldn't help your phone's pickup being uneven, that way. But 
> if you put the phone in the far field, pretty much the only thing you'd be 
> missing would be its linear characteristic. That would distort any one 
> measurement, but not any linear comparison. Also it needn't distort any 
> nonlinear measurement such as THD, per se.
> 
> Is there an app for that already?
> -- 
> Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
> +358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
> ___
> dupswapdrop: music-dsp mailing list
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[music-dsp] basic in-store speaker evaluation

[Sampo Syreeni]

Is there an extant software out there which lets me do comparisons 
between various speaker sets? Something in the vein of "just put in a 
test DVD-A, and let your Android app run"?


I mean, something like that ought to be doable per se. You'd just record 
your normal test signals such as an MLS noise of known characteristic, a 
1kHz sine wave, a set of linear chirps of growing magnitude, and a bunch 
of synch signals, in some reasonable combination. So that you could at 
least in theory do synchronous detection of whatever you hear from your 
test DVD-A, simply by listening to it via your phone.


Obviously you couldn't help your phone's pickup being uneven, that way. 
But if you put the phone in the far field, pretty much the only thing 
you'd be missing would be its linear characteristic. That would distort 
any one measurement, but not any linear comparison. Also it needn't 
distort any nonlinear measurement such as THD, per se.


Is there an app for that already?
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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