class RemiAudio::DSP::ZitaReverb

• RemiAudio::DSP::ZitaReverb
• RemiAudio::DSP::Reverb
• Reference
• Object

Overview

Implements a Hall-like reverb effect.

This is a port of Zita-Rev1, a mostly-a-hall-partially-a-plate reverb based on a feedback delay network and allpass comb filters.

The original Zita-Rev1 supports an "ambisonic" mode, which allows for two inputs and four outputs. This implementation does not support the calculations for ambisonic mode, however, so it's strictly a reverb with stereo output.

Direct Known Subclasses

• RemiAudio::DSP::ZitaReverbSimple

Defined in:

remiaudio/dsp/reverbs/zita-paraeq.cr
remiaudio/dsp/reverbs/zita-presets.cr
remiaudio/dsp/reverbs/zita.cr

Constant Summary

DEFAULT_PRE_DELAY = 0.02

DEFAULT_REVERB_DAMPING = 4300.0

DEFAULT_REVERB_EQ1_FREQ = 200.0

DEFAULT_REVERB_EQ1_GAIN = -1.3

DEFAULT_REVERB_EQ2_FREQ = 2500.0

DEFAULT_REVERB_EQ2_GAIN = 0.0

DEFAULT_REVERB_TIME_HIGH = 2.84

DEFAULT_REVERB_TIME_LOW = 2.12

DEFAULT_REVERB_XOVER = 369.0

MAXIMUM_PRE_DELAY = 0.10

MAXIMUM_REVERB_DAMPING = 24000.0

MAXIMUM_REVERB_EQ1_FREQ = 2500.0

MAXIMUM_REVERB_EQ1_GAIN = 15.0

MAXIMUM_REVERB_EQ2_FREQ = 10000.0

MAXIMUM_REVERB_EQ2_GAIN = 15.0

MAXIMUM_REVERB_TIME_HIGH = 8.0

MAXIMUM_REVERB_TIME_LOW = 8.0

MAXIMUM_REVERB_XOVER = 1000.0

MINIMUM_PRE_DELAY = 0.02

MINIMUM_REVERB_DAMPING = 1500.0

MINIMUM_REVERB_EQ1_FREQ = 40.0

MINIMUM_REVERB_EQ1_GAIN = -15.0

MINIMUM_REVERB_EQ2_FREQ = 160.0

MINIMUM_REVERB_EQ2_GAIN = -15.0

MINIMUM_REVERB_TIME_HIGH = 1.0

MINIMUM_REVERB_TIME_LOW = 1.0

MINIMUM_REVERB_XOVER = 50.0

NUM_DELAYS = 8

NUM_DIFFS = 8

NUM_FILTERS = 8

PARA_EQ_MAX_CH = 2

PRESETS = {PresetNames::GmDefault => Preset.new(predelay: DEFAULT_PRE_DELAY, crossover: DEFAULT_REVERB_XOVER, timeLow: DEFAULT_REVERB_TIME_LOW, timeHigh: DEFAULT_REVERB_TIME_HIGH, damping: DEFAULT_REVERB_DAMPING, eq1Freq: DEFAULT_REVERB_EQ1_FREQ, eq1Gain: DEFAULT_REVERB_EQ1_GAIN, eq2Freq: DEFAULT_REVERB_EQ2_FREQ, eq2Gain: DEFAULT_REVERB_EQ2_GAIN), PresetNames::SmallRoom => Preset.new(predelay: 0.03, crossover: 300.0, timeLow: 1.0, timeHigh: 1.1, damping: 7500.0, eq1Freq: 40.0, eq2Freq: 160.0, eq1Gain: 0.0, eq2Gain: 0.0), PresetNames::Hall => Preset.new(predelay: 0.042, crossover: 290.0, timeLow: 3.0, timeHigh: 4.0, damping: 3900.0, eq1Freq: 200.0, eq2Freq: 8000.0, eq1Gain: -1.1, eq2Gain: 1.2)}

Pre-constructed Preset instances for MVerb that correspond to the names in PresetNames.

TDELAY = [153129.0e-6, 210389.0e-6, 127837.0e-6, 256891.0e-6, 174713.0e-6, 192303.0e-6, 125000.0e-6, 219991.0e-6]

TDIFF = [20346.0e-6, 24421.0e-6, 31604.0e-6, 27333.0e-6, 22904.0e-6, 29291.0e-6, 13458.0e-6, 19123.0e-6]

ZITA_G = Math.sqrt(0.125)

Constructors

• .new(newSampleRate : Int32, numFrames : Int32)

Class Method Summary

• .checkCrossover(value) : Nil

  Checks if value is a valid crossover frequency for the two bands.

• .checkDamping(value) : Nil

  Checks if value is a valid damping amount.

• .checkEQ1Freq(value) : Nil

  Checks if value is a valid frequency for EQ1.

• .checkEQ1Gain(value) : Nil

  Checks if value is a valid gain for EQ1.

• .checkEQ2Freq(value) : Nil

  Checks if value is a valid frequency for EQ2.

• .checkEQ2Gain(value) : Nil

  Checks if value is a valid gain for EQ2.

• .checkPredelay(value) : Nil

  Checks if value is a valid predelay time.

• .checkTimeHigh(value) : Nil

  Checks if value is a valid time length for the high band.

• .checkTimeLow(value) : Nil

  Checks if value is a valid time length for the low band.

Macro Summary

• processZ(z, x0, x1)

Instance Method Summary

• #crossover : Float64
• #crossover=(value : Float64)
• #damping : Float64
• #damping=(value : Float64)
• #eq(number : Int) : Tuple(Float64, Float64)
• #mute : Nil
• #predelay : Float64
• #predelay=(value : Float64)
• #process(inputLeft : Array(Float64) | Slice(Float64), inputRight : Array(Float64) | Slice(Float64), outputLeft : Array(Float64) | Slice(Float64), outputRight : Array(Float64) | Slice(Float64)) : Nil
• #process(inputLeft : Array(Float32) | Slice(Float32), inputRight : Array(Float32) | Slice(Float32), outputLeft : Array(Float32) | Slice(Float32), outputRight : Array(Float32) | Slice(Float32)) : Nil
• #process(input : Array(Float64) | Slice(Float64), output : Array(Float64) | Slice(Float64)) : Nil
• #process(input : Array(Float32) | Slice(Float32), output : Array(Float32) | Slice(Float32)) : Nil
• #process(buffer : Array(Float64) | Slice(Float64), amount : Float64 | Float64 = 1.0) : Nil
• #process(buffer : Array(Float32) | Slice(Float32), amount : Float32 | Float64 = 1.0) : Nil
• #setEq(number : Int, frequency : Float64, gain : Float64)
• #timeHigh : Float64
• #timeHigh=(value : Float64)
• #timeLow : Float64
• #timeLow=(value : Float64)
• #updateInternalParams(*, numFrames : Int32 = 0)
• #usePreset(preset : Reverb::Preset) : Nil

Constructor Detail

Class Method Detail

Macro Detail

Instance Method Detail