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pcm decoder:triangular noise dither

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minjaesong
2023-01-08 21:53:19 +09:00
parent 853e48dc9a
commit ba699606bb
1 changed files with 4 additions and 3 deletions
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7
assets/disk0/tvdos/include/pcm.js
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@@ -1,12 +1,12 @@
const HW_SAMPLING_RATE = 30000 const HW_SAMPLING_RATE = 30000
function printdbg(s) { if (0) serial.println(s) } function printdbg(s) { if (0) serial.println(s) }
function printvis(s) { if (1) println(s) } function printvis(s) { if (0) println(s) }
function sampleToVisual(i) { function sampleToVisual(i) {
let rawstr = Math.abs(i).toString(2) let rawstr = Math.abs(i).toString(2)
if (i < 0) rawstr = rawstr.padStart(16, '0') if (i < 0) rawstr = rawstr.padStart(16, '0')
else rawstr = rawstr.padEnd(16, '0') else rawstr = rawstr.padEnd(16, '0')
let strPiece = rawstr.substring(0, Math.ceil(Math.abs(i) / 2048)) let strPiece = rawstr.substring(0, Math.ceil((Math.abs(i)) / 2048))
if (i == 0) if (i == 0)
return ' ][ ' return ' ][ '
if (i < 0) if (i < 0)
@@ -29,7 +29,8 @@ function s16Tou8(i) {
} }
function u16Tos16(i) { return (i > 32767) ? i - 65536 : i } function u16Tos16(i) { return (i > 32767) ? i - 65536 : i }
function randomRound(k) { function randomRound(k) {
if (Math.random() < (k - (k|0))) let rnd = (Math.random() + Math.random()) / 2.0 // this produces triangular distribution
if (rnd < (k - (k|0)))
return Math.ceil(k) return Math.ceil(k)
else else
return Math.floor(k) return Math.floor(k)