![]() ![]() Then the output of the generator is split into three branches: The white noise generator is based on a BC547 transistor (socketed, so you can easily change them). Block diagram will explain the basics of the devices topology: Ocean Noise Generator block diagram (made with my synthesizer diagram template) Both channel’s signal path is connected only in one point – where the “close wave” sound stage is being narrowed. The core of the circuit consists of 2 identical circuits, for left and right channel, sharing output stage mixing controls. 99% of components are easily available, only AS2164 quad VCA IC may a harder to obtain. The almost full schematic is here – the main voice board, excluding the power supply circuit, which is application-dependent (you can still jump to the PSU section and read about it). I wanted to test the AS2164 VCA and LFO circuits to see how much I can simplify them. I’ve also built a simple hardware prototype, just one pink noise generator with output amplitude modulated by triangle LFO. “air” noise to brighten overall sound (simple white noise separate for L and P channels). “close” waves (white noise low-passed around 4 kHz (VCF module) with amplitude modulated by triangle LFO, with L and P channels mixed to get panorama narrower than “far” waves), “far” waves (pink noise from NOIS with amplitude modulated by triangle LFO (VCA-2 + LFO-2), separate for L and P channels), “core” noise (simulated by pink noise NOIS module, separate for L and P channels), VCV Rack prototype – 2 noise generators, 2 HP filters, 4 VCAs, 4 LFOs, and 4 channel stereo mixer probably over €500 in the modular synth world I couldn’t model all nuances (like _/\_/\ half-triangle waveform), but it was still great to verify the idea. ![]() As a final touch, a bit of white can be added to reproduce the noise of the wind.īefore I moved to circuit prototyping, I decided to test the concept using VCV Rack – a software modular synthesizer. The other are “close” waves, smaller, washed ashore, with the well-defined direction they come from, and more high-frequency components. To make the simulation more natural, wave sounds are added – “far” waves, bass, and spatial, breaking lazily in the distance. The core was obvious – the pink noise, which alone sounds like a waterfall or very rough ocean. The generator was my side project for around 4 years, most of the time I spent figuring out how to get the ocean noise synthesized. As the white/pink noise generators quality is not bad, will work as a backup, two-channel, generator for simple measurements. Originally, the main usage was supposed to be ambient mixes for chill out-zones, but it greatly will serve as well as a home relaxation device, may be also useful for yoga classes. By mixing generated signals you can go from waterfall-like sound to gentle sea or storm if you like. The device is built around 2 white noise generators, 4 filters (to get pink and kind of hi-frequency boosted pink noise), 4 VCAs controlled by 4 LFOs with variable waveshape and modulation depth. Ocean Noise Generator (as the name says) generates stereophonic ocean-like noise, by simulation of background noise and different kinds of waves (“close” and “far”).
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