Phase shift mixing multiple square wave signals together  - Page 1
Forum section: electronics / general

author: jonovid
author_rank: Super Contributor
timestamp: January 22, 2022, 07:49:31 am
content: the idea here is to use a single clock input to represent up to 4 or 5 multiple square wave signals at one time in the use of phase shift mixingsoduplication of the logic gates is avoided at the outputs. one signal path can be used representing multiple square wave signalsbefore conducting experiments I seek the opinion of others. as reinventing the wheel isbefore ordering more components for an experiment that may failI seek the opinion of others.most phase shift mixing for motor control is only two inputsmixing 4 or 5 square wave signals together in to one square wave phase shiftNot an analog outputNot a analog to digital converterphase shift mixing to a square wave by logic gateswhyin music synthesis experimentssay I have 12 square wave inputs with-in one octave of frequency and all 12 are inputs are combined logicly to a single output in square wave phase shiftwill the individual square wave inputs be distinguishable in the output square wave? or will it be random noise?the difference between input signals will be less then one octave of their frequencyin most cases no more then 4 or 5 input signals will be combined logicly at any time out of a bank of 12 input square wave signalssquare wave duty cycles of all input signals be the same say 50% or 5% duty cyclemy experiment is tomake up a set of gates for all 12 inputs 12x 555 timersor get this ic8 input gate so two of thisnote that the on state for any one of the inputs will add to the signal output on time .74LVC30Ahttps://assets.nexperia.com/documents/data-sheet/74LVC30A.pdf

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 22, 2022, 10:00:25 am
content: To what end? Do you want to "mix" (in the audio sense) the signals?Logic gates are nonlinear in that sense. An adding circuit (audio mixer) is required.Phase shift is mostly irrelevant; the logic result will have tones (harmonics and intermodulation (mixing) products) at various sum and difference frequencies. Phase can null certain tones but not change the overall spectrum.(The most linear a gate gets, is either an XOR gate which is linear in the sense that it obeys algebraic rules, or maybe something like a Hadamard gate which is lossless in the information sense. Neither is linear in the analog sense.)If multiple outputs are acceptable, then an AND gate (to select each input), followed by a chain of adders, will create a binary result (ceil(lg(N)) bits for N inputs) corresponding to the analog sum.Tim

author: jonpaul
author_rank: Super Contributor
timestamp: January 22, 2022, 10:05:48 am
content: Check electronic music sites, and work of Moog, etc. on polyphonic syntheses.Jon

author: jonovid
author_rank: Super Contributor
timestamp: January 22, 2022, 12:48:23 pm
content: I have no idea what will happen if conducting this experiment it may end in random noise.just that no one has posted a circuit like this anywhere. maybe because it doesn't work.Quoteyes I know the audio at some point in the signal path needs to be recovered as analog from the digital output.in analog audio mixing the results are well known and well documented we all know that.QuoteI know about Moog ARP and Japanese Roland history, the many good analog synthesizer siteswhy try this or experimentthere are some things one can do with a digital output that one can not do with a analog outputexample clocking sequencers and digital circuit bending.I started with the popularAtari Punk Consoleand decided add to both ends of the circuit with a big bag of 555's from AliEx.the front end is the circuit posted here. middle is the un-known digital circuitand the rear end does work as a digital to analog converter.I am posting to see if anyone has tried this beforethinking about this it looks like a high frequency clock is needed to coordinate thedigital mixing at both the top and bottom of the frequency's to be combined. this is getting complicatedif all else fails I can copythe Atari Punk Console circuit12 times in parallel, then tune it to scale. that's 24 knobs to play with.add two sequencers on analog audio mixing output, 18 more knobs to play with. mission accomplished