Forums - Music techology
Subject: how does an oscillator work
Original Message 1/17 09-Sep-98 @ 04:12 AM - how does an oscillator work
also, why the FUCK do companies bother with analog modelling? i can understand real-instrument modelling, for the lifelike realism...but real analog is surely much cheaper than emulating it with a chip! why bother?? seems like a serious case of fixing shite that ain't broke...
Message 2/17 09-Sep-98 @ 07:03 AM - RE: how does an oscillator work
Message 3/17 09-Sep-98 @ 09:21 PM - RE: how does an oscillator work
Message 4/17 10-Sep-98 @ 03:38 AM - RE: how does an oscillator work
then you have pulse waves.... a square wave is a pulse emitted all on at once.. held then all-off at once... a sawtooth is fade up and all-off at once (almost).... plus spike waves which are like tiny short on-off bursts... .
a pulse wave has a length called the 'mark' time.. and intervals, called 'space' time..... the mark/space ratio describes the shape of the pulse.... a number of sine waves can be added up to produce a pulse wave with a certain repetition frequency.....one of those frequencies dominates to determine the repetition rate... this is the fundamental frequency..... this accounts for the way the fish can swim undrwater without breathing in the conventional sense as we know it.... er....
Message 5/17 10-Sep-98 @ 05:13 AM - RE: how does an oscillator work
Message 6/17 10-Sep-98 @ 09:56 AM - RE: how does an oscillator work
Message 7/17 10-Sep-98 @ 10:42 AM - RE: how does an oscillator work
inductors, diodes and other items around an oscillator is what ultimately controls the type of waveform that is produced.
Buggo, the type of waveforms that you are seeking can be done with proper circuit "biasing". With a sine wave, voltage is applied to a certain point then allowed to decay. It does in phase and out of phase thus producing the positive and negative cycle of the sine wave. With waveforms that are being "cut off", you usually have a diode in the circuit that "turns on" when it has a certain amount of voltage on one side of it, thus "cutting off" the waveform. This is biasing. A diode has a negative and a positive side. If you apply +5 volts on the neg. side of a diode, it will not conduct or "turn on". If you apply that same voltage on the positive side, it will conduct. Depending on how intricate the circuit, you can create virtually any type of waveform you desire.
Peace
Message 8/17 10-Sep-98 @ 03:16 PM - RE: how does an oscillator work
i was mucking about with a tutorial on synthesis a few years back and created a simple program where you add two sinewaves together with different frequencies. try it. as such, you can create a myriad of bizzare waveforms.
try just adding a touch of a detuned 2nd oscillator to 'colour' the timbre of the first. not as intense as some other forms of modulation, but something to explore if you are limited to an analog synth.
xoxos.
Message 10/17 11-Sep-98 @ 01:23 AM - RE: how does an oscillator work
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