Subject: Re: [AUDITORY] EEG - what hardware do you use to record triggers? From: Lloyd Smith <lsmith@xxxxxxxx> Date: Sun, 6 Aug 2023 11:06:49 -0400--000000000000826a730602427b81 Content-Type: text/plain; charset="UTF-8" We make a device called Triggy (https://tinyurl.com/v79tr7zf) that can produce TTL outputs with the same precision as the synchronization between channels of any audio device. It accepts audio (or photocell, or pressure) inputs and converts each input into a precisely timed TTL output. We are the US/Canada representative for Biosemi, so Triggy was designed to address the need for trigger timing precision to match the high sampling rates the ActiveTwo system provides for auditory neuroscience applications. Triggys TTL onset times are ultra-precise. With an analog audio source, the response time is a function of the internal propagation delay of 0.25 nanoseconds. Onset jitter and interchannel differences are thus practically unmeasurable. Offset time (the length of TTL outputs) are set by an analog RC time constant circuit, so they can vary a bit, owing to the imprecision of passive components. However, four of the eight channels can be latched together so that their output durations match perfectly, making it easier to interpret the four bits as a nibble by applying a binary mask to the TTL output byte. There are some demonstration videos on YouTube at https://tinyurl.com/44xht85z. I'd be happy to answer any questions about Triggy or demonstrate specific functionality either over Zoom or in an edited YouTube video. Just drop me a line offline. Best regards, Lloyd Smith President Cortech Solutions, Inc. E-mail: LSmith@xxxxxxxx Tel: 910-362-1143 x202 Cell: 910-431-2811 > > > On Fri, Aug 4, 2023, 11:18 PM Abigail Noyce <anoyce@xxxxxxxx> wrote: > >> Hi Auditory list! Do you have an EEG triggering setup that you're happy >> with? Can you tell me about it? We are using the BioSemi EEG system, with a >> custom hardware box that converts auditory channel output to TTL pulses. >> This has worked well enough, but the custom hardware boxes are aging and >> starting to fail, and are not well documented or supported. We'd like to >> move to an off-the-shelf solution. We've recently purchased a new product, >> but we haven't gotten it working reliably (not calling anyone out here!). >> We need to be able to record multi-bit triggers, at sub-millisecond >> precision. What's out there that's working for people? >> >> Thanks! >> Abby Noyce >> >> -- >> Abigail Noyce, Ph.D. >> > -- Cortech Solutions, Inc.1409 Audubon Blvd, Suite B1 Wilmington, NC 28403 USA Tel: 910-362-1143 Fax: 910-378-3443 Sales: sales@xxxxxxxx <mailto:sales@xxxxxxxx> Support / repairs: support@xxxxxxxx <mailto:support@xxxxxxxx> Billing / administration: admin@xxxxxxxx <mailto:admin@xxxxxxxx> Web: www.cortechsolutions.com <http://www.cortechsolutions.com> --000000000000826a730602427b81 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable <div dir=3D"auto">We make a device called Triggy (<a href=3D"https://tinyur= l.com/v79tr7zf" target=3D"_blank" rel=3D"noreferrer">https://tinyurl.com/v7= 9tr7zf</a>) that can produce TTL outputs with the same precision as the syn= chronization between channels of any audio device. It accepts audio (or pho= tocell, or pressure) inputs and converts each input into a precisely timed = TTL output. We are the US/Canada representative for Biosemi, so Triggy was = designed to address the need for trigger timing precision to match the high= sampling rates the ActiveTwo system provides for auditory neuroscience app= lications.<div dir=3D"auto"><br></div><div dir=3D"auto">Triggys TTL onset t= imes are ultra-precise. With an analog audio source, the response time is a= function of the internal propagation delay of 0.25 nanoseconds. Onset jitt= er and interchannel differences are thus practically unmeasurable. Offset t= ime (the length of TTL outputs) are set by an analog RC time constant circu= it, so they can vary a bit, owing to the imprecision of passive components.= However, four of the eight channels can be latched together so that their = output durations match perfectly, making it easier to interpret the four bi= ts as a nibble by applying a binary mask to the TTL output byte.</div><div = dir=3D"auto"><br><div data-smartmail=3D"gmail_signature" dir=3D"auto">There= are some demonstration videos on YouTube at=C2=A0<a href=3D"https://tinyur= l.com/44xht85z">https://tinyurl.com/44xht85z</a>.</div><div data-smartmail= =3D"gmail_signature" dir=3D"auto"><br></div><div data-smartmail=3D"gmail_si= gnature" dir=3D"auto">I'd be happy to answer any questions about Triggy= or demonstrate specific functionality either over Zoom or in an edited You= Tube video. Just drop me a line offline.</div><div data-smartmail=3D"gmail_= signature" dir=3D"auto"><br>Best regards,=C2=A0<br><br>Lloyd Smith=C2=A0<br= >President=C2=A0<br>Cortech Solutions, Inc.=C2=A0<br><br>E-mail:=C2=A0<a hr= ef=3D"mailto:LSmith@xxxxxxxx" rel=3D"noreferrer noreferrer" tar= get=3D"_blank">LSmith@xxxxxxxx</a>=C2=A0<br><br>Tel:=C2=A0910-3= 62-1143 x202=C2=A0<br><br>Cell:=C2=A0910-431-2811<br><br><br>=C2=A0=C2=A0= =C2=A0 </div><br><div class=3D"gmail_quote" dir=3D"auto"><blockquote class= =3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd= ing-left:1ex"><div dir=3D"auto"><div dir=3D"auto"><br><br></div><br><div cl= ass=3D"gmail_quote" dir=3D"auto"><div dir=3D"ltr" class=3D"gmail_attr">On F= ri, Aug 4, 2023, 11:18 PM Abigail Noyce <<a href=3D"mailto:anoyce@xxxxxxxx= " rel=3D"noreferrer noreferrer noreferrer" target=3D"_blank">anoyce@xxxxxxxx<= /a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0= 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Hi = Auditory list! Do you have an EEG triggering setup that you're happy wi= th? Can you tell me about it? We are using the BioSemi EEG system, with a c= ustom hardware box that converts auditory channel output to TTL pulses. Thi= s has worked well enough, but the custom hardware boxes are aging and start= ing to fail, and are not well documented or supported. We'd like to mov= e to an off-the-shelf solution. We've recently purchased a new product,= but we haven't gotten it working reliably (not calling anyone out here= !). We need to be able to record multi-bit triggers, at sub-millisecond pre= cision. What's out there that's working for people?<div><div><br></= div><div>Thanks!</div><div>Abby Noyce<br clear=3D"all"><div><br></div><span= class=3D"gmail_signature_prefix">-- </span><br><div dir=3D"ltr" class=3D"g= mail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div di= r=3D"ltr"><div>Abigail Noyce, Ph.D.</div></div></div></div></div></div></di= v> </blockquote></div></div> </blockquote></div></div></div> <br> <hr><font size=3D"2">Cortech Solutions, Inc.</font><div><font size=3D"2">14= 09 Audubon Blvd, Suite B1</font></div><div><font size=3D"2">Wilmington, NC = 28403 USA</font></div><div><font size=3D"2"><br></font></div><div><font siz= e=3D"2">Tel: 910-362-1143</font></div><div><font size=3D"2">Fax:</font> 910= -378-3443<br></div><div><font size=3D"2"><br></font></div><div><font size= =3D"2">Sales: <a href=3D"mailto:sales@xxxxxxxx" target=3D"_blan= k">sales@xxxxxxxx</a></font></div><div><font size=3D"2">Support= / repairs: <a href=3D"mailto:support@xxxxxxxx" target=3D"_blan= k">support@xxxxxxxx</a></font></div><div><font size=3D"2">Billi= ng / administration: <a href=3D"mailto:admin@xxxxxxxx" target= =3D"_blank">admin@xxxxxxxx</a></font></div><div><font size=3D"2= "><br></font></div><div><div><font size=3D"2">Web: <a href=3D"http://www.co= rtechsolutions.com" target=3D"_blank">www.cortechsolutions.com</a></font></= div></div><div style=3D"font-size:1.3em"><br></div> --000000000000826a730602427b81--