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fix: TAD for TSVM producing distorted audio

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minjaesong
2025-11-10 10:43:49 +09:00
parent 0e6f2162c8
commit 0f5875d45b
2 changed files with 30 additions and 14 deletions
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40
tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
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@@ -142,17 +142,32 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
)
// Base quantiser weight table (10 subbands: LL + 9 H bands)
private val BASE_QUANTISER_WEIGHTS = floatArrayOf(
1.0f, // LL (L9) - finest preservation
1.0f, // H (L9)
1.0f, // H (L8)
1.0f, // H (L7)
1.0f, // H (L6)
1.1f, // H (L5)
1.2f, // H (L4)
1.3f, // H (L3)
1.4f, // H (L2)
1.5f // H (L1) - coarsest quantization
// CRITICAL: Different weights for Mid (channel 0) and Side (channel 1) channels!
private val BASE_QUANTISER_WEIGHTS = arrayOf(
floatArrayOf( // Mid channel (channel 0)
4.0f, // LL (L9) DC
2.0f, // H (L9) 31.25 hz
1.8f, // H (L8) 62.5 hz
1.6f, // H (L7) 125 hz
1.4f, // H (L6) 250 hz
1.2f, // H (L5) 500 hz
1.0f, // H (L4) 1 khz
1.0f, // H (L3) 2 khz
1.3f, // H (L2) 4 khz
2.0f // H (L1) 8 khz
),
floatArrayOf( // Side channel (channel 1)
6.0f, // LL (L9) DC
5.0f, // H (L9) 31.25 hz
2.6f, // H (L8) 62.5 hz
2.4f, // H (L7) 125 hz
1.8f, // H (L6) 250 hz
1.3f, // H (L5) 500 hz
1.0f, // H (L4) 1 khz
1.0f, // H (L3) 2 khz
1.6f, // H (L2) 4 khz
3.2f // H (L1) 8 khz
)
)
private val LAMBDA_FIXED = 6.0f
@@ -931,7 +946,8 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
val normalizedVal = lambdaDecompanding(quantized[i], maxIndex)
// Denormalize using the subband scalar and apply base weight + quantiser scaling
val weight = BASE_QUANTISER_WEIGHTS[sideband] * quantiserScale
// CRITICAL: Use channel-specific weights (Mid=0, Side=1)
val weight = BASE_QUANTISER_WEIGHTS[channel][sideband] * quantiserScale
coeffs[i] = normalizedVal * TAD32_COEFF_SCALARS[sideband] * weight
// }
}