What is s&h waveform (lfo) for exmaple

loopeytunes · 15 Dec 2010

sample and hold maybe?

theun · 15 Dec 2010

djbrynte wrote: (....) Also intrested in knowing what panic button is. SO what is (....) panic button?

wikipedia wrote: In a MIDI instrument when the note-off message for a played note is not received, the note will sound on endlessly, and also has the potential to raise in amplitude enough to damage the speakers or other components in the sound system. Hitting the panic button will send a note-off command to all keys, stopping any notes that were still playing.

Oops, sounds a bit academic to me! Anyway, when one or more notes don't stop automatically you should hit the panic button.

theun

Acrobat · 15 Dec 2010

djbrynte wrote: does anyone know what it means. Also intrested in knowing what panic button is.

SO what is sh waveform and panic button?

panic button comes from the 80-90s MIDI age, sends ALL NOTE OFF when some machines of your setup were stuck on a note and can't receive further MIDI messeges. The panic funtion sends a flush of MIDI note off signals on ALL midi channels at once. Then you could restart the sequencer. It is still there on Cubase after 20 years and I stilll use it! Also some hardware synths has the fucntion built in. A. 😉

trogluddite · 15 Dec 2010

There is a thread and some schematics HERE for turning off all MIDI notes.

Acrobat · 15 Dec 2010

trogluddite wrote: There is a thread and some schematics HERE for turning off all MIDI notes.

the good old infzion and hey, how big is this forum?

djbrynte · 15 Dec 2010

thnx then i know what panic button is what is the SH its sample hold right? So what does that do on the lfo?

Jay · 15 Dec 2010

wikipedia also wrote and jay copied and pasted it

In electronics, a sample and hold (S/H, also "follow-and-hold"[1]) circuit is an analog device that samples (captures, grabs) the voltage of a continuously varying analog signal and holds (locks, freezes) its value at a constant level for a specified minimal period of time. Sample and hold circuits and related peak detectors are the elementary analog memory devices. They are typically used in analog-to-digital converters to eliminate variations in input signal that can corrupt the conversion process.[2]

A typical sample and hold circuit stores electric charge in a capacitor and contains at least one fast FET switch and at least one operational amplifier.[1] To sample the input signal the switch connects the capacitor to the output of a buffer amplifier. The buffer amplifier charges or discharges the capacitor so that the voltage across the capacitor is practically equal, or proportional to, input voltage. In hold mode the switch disconnects the capacitor from the buffer. The capacitor is invariably discharged by its own leakage currents and useful load currents, which makes the circuit inherently volatile, but the loss of voltage (voltage droop) within a specified hold time remains within an acceptable error margin. 😀 Here is another form of sample holding 😈

Best regards

trogluddite · 15 Dec 2010

Jay wrote: Here is another form of sample holding

I imagine that it would have a similar 'randomising' modulation effect to a S&H LFO when added to a vintage analogue synth too! 😉 (Sorry, I'm just taking the p*ss 😕 )

djbrynte · 15 Dec 2010

lol hahaha showing pie :P But ok i understand little mybe this is for the big boys 😀 Hard to read all this... I need some one to show me with images i think. Or what ever guys let it just be ui wont use it 😀 sounds to hard.

Jay · 15 Dec 2010

Lol Trogg 😀

datsound · 22 Dec 2010

this is a S & H LFO, when it is "held" the signal stays flat, at regular intervals, and when it "samples" it jumps to another value to sample, and holds it again.

this signal looks random, but SH can also be regular up and down stairs patterns, it depends if the sample hold frequency is related to the frequency of the signal it is sampling. if you have this: /\/\/\/\/\/\/\/\/\ and you sample and hold it with this: ..................

you get all different random or regular pulse shapes. if you devide each /\/ by 10 ... then you will have a pattern s h, if you make 23.6432786 /\/ shapes in between every . shape it would look pretty random.