the time of the 'beep' function

[Peter Quain]

that is a cool tone

At 11:25 PM 20/04/2012, you wrote:
>Scientists,
>Well, there we go. Here's the very ultimate in timing: 100 ms 
>16bit/stereo (which is useless)/44.1Khz wave-form with envelope of 
>10 ms stochastic fade in/fade out (to avoid clicks). Please use this 
>if you want a real beep or want some sound to demarcate an event or something.
>Hope it'll be actually attached after i send it to g-groups.
>Best,
>Michiel
>
>From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On 
>Behalf Of Michiel Sovijarvi-Spape
>Sent: 20 April 2012 16:09
>To: e-prime at googlegroups.com
>Subject: RE: the time of the 'beep' function
>
>Hi,
>No. In fact, it will say explicitly in your e-basic help file that 
>the Beep function *should never be used* for stimulus presentation. 
>This is because E-Prime cannot guarantee the onset time of the beep 
>- the only thing your function below does is measuring when E-Prime 
>starts to send the call to beep to Windows (if I'm not mistaken). It 
>will then take X ms until your internal speaker starts beeping. For 
>that matter, what beep is it? How long in ms? Is there a fade in or 
>does it start at full amplitude? What frequency? dB? If you can't 
>know this (and you'd have to measure it with a microphone), it is 
>exactly the same as saying "Somewhere around the 3rd second, maybe, 
>a picture of unknown quality, size and colour was shown to the 
>subjects for a bit", literally.
>Anyway, so you might find out, with an electronic ear and such, but 
>you could take the easy path and just record a precise tone using 
>something like cooledit. PST can, given conditions, guarantee ('ish) 
>accurate timing for sound-files, just not for beeps (correct me if I'm wrong).
>
>To be fair, I don't know why they don't just provide an inbuilt 
>function to play a 1s 1000 Hz sine wave tone and name the sub to 
>play("MichsCoolTone.wav") beep. I think people can spare the few 
>bytes of memory involved in keeping that permanently in memory.
>Cheers,
>Michiel
>
>
>
>From: <mailto:e-prime at googlegroups.com>e-prime at googlegroups.com 
>[mailto:e-prime at googlegroups.com] On Behalf Of hangue jo
>Sent: 20 April 2012 11:43
>To: <mailto:e-prime at googlegroups.com>e-prime at googlegroups.com
>Subject: the time of the 'beep' function
>
>Hi there,
>
>Is there anybody figure out how to measure the onset time of the beep?
>Is this code below report the exact onset time of beep in milisecond 
>unit (with trigger signal to sync to the recording computer)?
>
>Beep
>WritePort &H378, 1
>BeepTime = Clock.Read
>
>I can't use Slide object because of my whole stimuli was conducted 
>in InLine (made an animation using Canvas).
>Thank you.
>
>Best,
>HanGue Jo.
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