WodzBorsuk
I don't know if I'm the minority here, but all 3 of my controllers (mixtrack pro, NS6 and now HS5500's) over time developed a bug which caused certain buttons to send a doubled signal after pressing. I would press play and track would move a few mili seconds and stop, on Serato i would press load, and software performed an instant double function which was associated with double clicking load button.
I assume that it comes from used up micro switches but I figured it wouldn't be too much trouble to add the option "prevent accidental double press" which would cause Virtual DJ to ignore every double press that occured, let's say less than 10ms apart. It's not humanly possible to double press a button in such short time so I think it wouldn't affect anyone performance and it would really help out all of us using a slightly "worn out" hardware.
I assume that it comes from used up micro switches but I figured it wouldn't be too much trouble to add the option "prevent accidental double press" which would cause Virtual DJ to ignore every double press that occured, let's say less than 10ms apart. It's not humanly possible to double press a button in such short time so I think it wouldn't affect anyone performance and it would really help out all of us using a slightly "worn out" hardware.
Inviato Wed 03 Dec 14 @ 3:30 pm
locoDog
The term is 'contact bounce' and HW has debouncing built in usually about 50 ms so I'm not sure this is a goer.
Inviato Wed 03 Dec 14 @ 5:16 pm
WodzBorsuk
HW?
Inviato Wed 03 Dec 14 @ 5:34 pm
locoDog
HW=Hardware SW=Software
Inviato Wed 03 Dec 14 @ 7:15 pm
WodzBorsuk
Well as I said I used 3 midi devices, and none of them had it or it didn't work properly. Software implementation shouldn't be much work, hence the thread. Am I the only one who had experienced such problems?
Inviato Wed 03 Dec 14 @ 8:01 pm
locoDog
No all hardware has debouncing written in to the firmware, (it has to) adding another layer of debouncing in the SW will make it a bit unresponsive, I think it's time to get the soldering iron out.
Inviato Thu 04 Dec 14 @ 1:28 am
WodzBorsuk
Ok I've read about "contact bounce" and I understand why one can assume that debouncing has to implemented in the hardware itself as it's a case for every switch by nature. Sill i've looked at few sample codes implementing debouncing and they do not appear to be resource consuming in comparison to all the other things software has to do every time a button is pressed. I'm not that hi-level programmer to presume I can think of every drawback to adding a second level of debouncing in the software, but if it's possible it would be a nice feature.
If not - well my soldering iron has it's own little spot on my desk ;).
If not - well my soldering iron has it's own little spot on my desk ;).
Inviato Thu 04 Dec 14 @ 5:30 am
PhantomDeejay
To be honest, the cost to replace a few button switches does not justify the cost to implement a second layer of software protection.
Also the key here is not CPU consumption, but LATENCY!!! Software protection against accidental double clicks would increase the latency between the button press and the software processing the command.
Finally the fact that when you press play you can hear some sound and then it stops, means that the second "press" was enough time ahead of initial press to get away from protection.
PS: When you scratch, or tap buttons "quickly" to create a stutter effect your hand can get as low as sending a command every 3 ms!
PS2: The useless information of the day: Some drummers are known to be able to manipulate hits approximately every 1.6ms meaning 600 hits per minute (per hand - 1200 total)! So, no it's not impossible to hit willingly the same button twice in less than 10ms!
Also the key here is not CPU consumption, but LATENCY!!! Software protection against accidental double clicks would increase the latency between the button press and the software processing the command.
Finally the fact that when you press play you can hear some sound and then it stops, means that the second "press" was enough time ahead of initial press to get away from protection.
PS: When you scratch, or tap buttons "quickly" to create a stutter effect your hand can get as low as sending a command every 3 ms!
PS2: The useless information of the day: Some drummers are known to be able to manipulate hits approximately every 1.6ms meaning 600 hits per minute (per hand - 1200 total)! So, no it's not impossible to hit willingly the same button twice in less than 10ms!
Inviato Thu 04 Dec 14 @ 1:36 pm
WodzBorsuk
Understood.. Thank you for taking the time to explain the problem in such detail. Shutting up now.. ;)
Inviato Thu 11 Dec 14 @ 11:42 am