Created
December 7, 2020 17:57
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Pokey noise, 4-bit poly, joined channels (16bit divider)
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poly_4 = [0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1] | |
poly_5 = [0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1] | |
CLOCK_177 = 1778400 | |
MIN_SAMPLE_RATE = 8000 | |
MAX_SAMPLE_RATE = 96000 | |
function createNoise16Buffer(ctx, poly_data, divider) { | |
let position = 0; | |
sample_rate = Math.floor(CLOCK_177 / (divider + 1)) | |
let multiplier = 1 | |
if(sample_rate < MIN_SAMPLE_RATE) { | |
multiplier = Math.ceil(MIN_SAMPLE_RATE / sample_rate) | |
} else if(sample_rate > MAX_SAMPLE_RATE) { | |
return null; | |
} | |
let n_samples = sample_rate * multiplier; | |
console.log("sample rate:", sample_rate, "mult:", multiplier) | |
data = new Float32Array(n_samples) | |
let index = 0; | |
for(let n=0; n<n_samples; n++) { | |
let sample = poly_data[position % poly_data.length] * 2 - 0.5 | |
position += 1 | |
for(let i=0; i<multiplier; i++) { | |
data[index] = sample; | |
index += 1; | |
} | |
} | |
console.log(data); | |
let buffer = ctx.createBuffer(1, n_samples, n_samples) | |
buffer.copyToChannel(data, 0) | |
return buffer | |
} | |
let ctx = new AudioContext() | |
let buffer = createNoise16Buffer(ctx, poly_4, 0x5e6) | |
buffer_source = ctx.createBufferSource() | |
buffer_source.buffer = buffer | |
buffer_source.connect(ctx.destination) | |
buffer_source.start() |
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