Reel-to-reel tape emulation with physical hysteresis and transport. More...

#include <TapeMachine.h>

Public Types
enum class	Standard { NAB , CCIR }
	Playback equalization standard. More...

enum class	Speed { IPS_7_5 , IPS_15 , IPS_30 }
	Tape speed. More...

Public Member Functions
void	prepare (const AudioSpec &spec)
	Allocates the whole chain. Invalid specs (non-positive or non-finite rate, block size or channel count) are ignored: the previous state is kept and an unprepared instance stays pass-through.

void	reset () noexcept
	Clears all signal state (keeps parameters). RT-safe.

void	setDrive (T driveDb) noexcept
	Input drive in dB [-12, +24]. Level-compensated: more drive means more saturation at roughly constant loudness. Non-finite values are ignored.

void	setBias (T bias) noexcept
	Bias setting [0, 1]; 0.5 is nominal calibration (carrier at 3x the JA field constant: full branch-memory erasure, clean odd saturation). Below nominal the carrier drops under the erase threshold: growing distortion and the level instability of a real under-biased machine. Above nominal, self-erasure progressively rolls off the top octave. Non-finite values are ignored.

void	setOversampling (int factor)
	Configures internal oversampling of the biased hysteresis core (visible, tunable and switchable off). SETUP THREAD ONLY - it reallocates the polyphase filters and re-prepares/re-calibrates the whole chain exactly like prepare(); never call it concurrently with processBlock().

int	getOversamplingFactor () const noexcept
	Active oversampling factor (1 = off, 4 = default).

void	setSpeed (Speed s) noexcept
	Tape speed (changes EQ time constants, losses and head bump). Out-of-range values are clamped.

void	setStandard (Standard s) noexcept
	Equalization standard (NAB adds the LF time constant). Out-of-range values are clamped.

void	setLossEffects (T amount) noexcept
	Playback loss intensity [0, 1] (0 bypasses the loss FIR). Non-finite values are ignored.

void	setHeadBump (T amount) noexcept
	Head-bump resonance intensity [0, 1] (~2.5 dB at full). Non-finite values are ignored.

void	setWowFlutter (T amount) noexcept
	Wow & flutter depth [0, 1] (~0.25% peak pitch deviation at 1). Non-finite values are ignored.

void	setNoise (T dbfs) noexcept
	Tape hiss level in dBFS (e.g. -55 for audible vintage hiss); values <= -120 disable it (default). Non-finite values are ignored.

void	setMix (T mix) noexcept
	Dry/wet mix [0, 1]; dry is latency-compensated. Non-finite values are ignored.

T	getDrive () const noexcept

T	getBias () const noexcept

Speed	getSpeed () const noexcept

Standard	getStandard () const noexcept

T	getLossEffects () const noexcept

T	getHeadBump () const noexcept

T	getWowFlutter () const noexcept

T	getNoise () const noexcept

T	getMix () const noexcept

int	getLatency () const noexcept
	Total latency in samples (active oversampler + loss FIR + transport delay); reflects the current factor for host PDC.

int	getLatencySamples () const noexcept
	Compatibility alias of getLatency(), in prepared-rate samples.

std::vector< uint8_t >	getState () const
	Serializes the parameter state (setup/UI threads; allocates).

bool	setState (const uint8_t *data, size_t size)
	Restores parameters from a blob (tolerant; rejects foreign ids).

void	processBlock (AudioBufferView< T > buffer) noexcept
	Processes a block in-place. Pass-through until prepare() succeeds.

Detailed Description

template<FloatType T>
class dspark::TapeMachine< T >

Reel-to-reel tape emulation with physical hysteresis and transport.

Template Parameters

T	Sample type (float or double).

Definition at line 121 of file TapeMachine.h.

Member Enumeration Documentation

◆ Speed

template<FloatType T>

enum class dspark::TapeMachine::Speed

strong

Tape speed.

Enumerator
IPS_7_5
IPS_15
IPS_30

Definition at line 128 of file TapeMachine.h.

◆ Standard

template<FloatType T>

enum class dspark::TapeMachine::Standard

strong

Playback equalization standard.

Enumerator
NAB
CCIR

Definition at line 125 of file TapeMachine.h.

Member Function Documentation

◆ getBias()

template<FloatType T>

T dspark::TapeMachine< T >::getBias ( ) const

inlinenoexcept

Definition at line 374 of file TapeMachine.h.

◆ getDrive()

template<FloatType T>

T dspark::TapeMachine< T >::getDrive ( ) const

inlinenoexcept

Definition at line 373 of file TapeMachine.h.

◆ getHeadBump()

template<FloatType T>

T dspark::TapeMachine< T >::getHeadBump ( ) const

inlinenoexcept

Definition at line 384 of file TapeMachine.h.

◆ getLatency()

template<FloatType T>

int dspark::TapeMachine< T >::getLatency ( ) const

inlinenoexcept

Total latency in samples (active oversampler + loss FIR + transport delay); reflects the current factor for host PDC.

Definition at line 391 of file TapeMachine.h.

◆ getLatencySamples()

template<FloatType T>

int dspark::TapeMachine< T >::getLatencySamples ( ) const

inlinenoexcept

Compatibility alias of getLatency(), in prepared-rate samples.

Definition at line 394 of file TapeMachine.h.

◆ getLossEffects()

template<FloatType T>

T dspark::TapeMachine< T >::getLossEffects ( ) const

inlinenoexcept

Definition at line 383 of file TapeMachine.h.

◆ getMix()

template<FloatType T>

T dspark::TapeMachine< T >::getMix ( ) const

inlinenoexcept

Definition at line 387 of file TapeMachine.h.

◆ getNoise()

template<FloatType T>

T dspark::TapeMachine< T >::getNoise ( ) const

inlinenoexcept

Definition at line 386 of file TapeMachine.h.

◆ getOversamplingFactor()

template<FloatType T>

int dspark::TapeMachine< T >::getOversamplingFactor ( ) const

inlinenoexcept

Active oversampling factor (1 = off, 4 = default).

Definition at line 307 of file TapeMachine.h.

◆ getSpeed()

template<FloatType T>

Speed dspark::TapeMachine< T >::getSpeed ( ) const

inlinenoexcept

Definition at line 375 of file TapeMachine.h.

◆ getStandard()

template<FloatType T>

Standard dspark::TapeMachine< T >::getStandard ( ) const

inlinenoexcept

Definition at line 379 of file TapeMachine.h.

◆ getState()

template<FloatType T>

std::vector< uint8_t > dspark::TapeMachine< T >::getState ( ) const

inline

Serializes the parameter state (setup/UI threads; allocates).

Definition at line 397 of file TapeMachine.h.

◆ getWowFlutter()

template<FloatType T>

T dspark::TapeMachine< T >::getWowFlutter ( ) const

inlinenoexcept

Definition at line 385 of file TapeMachine.h.

◆ prepare()

template<FloatType T>

void dspark::TapeMachine< T >::prepare ( const AudioSpec & spec )

inline

Allocates the whole chain. Invalid specs (non-positive or non-finite rate, block size or channel count) are ignored: the previous state is kept and an unprepared instance stays pass-through.

Definition at line 135 of file TapeMachine.h.

◆ processBlock()

template<FloatType T>

void dspark::TapeMachine< T >::processBlock ( AudioBufferView< T > buffer )

inlinenoexcept

Processes a block in-place. Pass-through until prepare() succeeds.

Definition at line 437 of file TapeMachine.h.

◆ reset()

template<FloatType T>

void dspark::TapeMachine< T >::reset ( )

inlinenoexcept

Clears all signal state (keeps parameters). RT-safe.

Definition at line 228 of file TapeMachine.h.

◆ setBias()

template<FloatType T>

void dspark::TapeMachine< T >::setBias ( T bias )

inlinenoexcept

Bias setting [0, 1]; 0.5 is nominal calibration (carrier at 3x the JA field constant: full branch-memory erasure, clean odd saturation). Below nominal the carrier drops under the erase threshold: growing distortion and the level instability of a real under-biased machine. Above nominal, self-erasure progressively rolls off the top octave. Non-finite values are ignored.

Definition at line 277 of file TapeMachine.h.

◆ setDrive()

template<FloatType T>

void dspark::TapeMachine< T >::setDrive ( T driveDb )

inlinenoexcept

Input drive in dB [-12, +24]. Level-compensated: more drive means more saturation at roughly constant loudness. Non-finite values are ignored.

Definition at line 264 of file TapeMachine.h.

◆ setHeadBump()

template<FloatType T>

void dspark::TapeMachine< T >::setHeadBump ( T amount )

inlinenoexcept

Head-bump resonance intensity [0, 1] (~2.5 dB at full). Non-finite values are ignored.

Definition at line 342 of file TapeMachine.h.

◆ setLossEffects()

template<FloatType T>

void dspark::TapeMachine< T >::setLossEffects ( T amount )

inlinenoexcept

Playback loss intensity [0, 1] (0 bypasses the loss FIR). Non-finite values are ignored.

Definition at line 333 of file TapeMachine.h.

◆ setMix()

template<FloatType T>

void dspark::TapeMachine< T >::setMix ( T mix )

inlinenoexcept

Dry/wet mix [0, 1]; dry is latency-compensated. Non-finite values are ignored.

Definition at line 367 of file TapeMachine.h.

◆ setNoise()

template<FloatType T>

void dspark::TapeMachine< T >::setNoise ( T dbfs )

inlinenoexcept

Tape hiss level in dBFS (e.g. -55 for audible vintage hiss); values <= -120 disable it (default). Non-finite values are ignored.

Definition at line 359 of file TapeMachine.h.

◆ setOversampling()

template<FloatType T>

void dspark::TapeMachine< T >::setOversampling ( int factor )

inline

Configures internal oversampling of the biased hysteresis core (visible, tunable and switchable off). SETUP THREAD ONLY - it reallocates the polyphase filters and re-prepares/re-calibrates the whole chain exactly like prepare(); never call it concurrently with processBlock().

Parameters

factor Power-of-two multiplier in {1,2,4,8,16}. DEFAULT 4. 1 = OFF (no internal resampling, zero added oversampler latency; the AC-bias carrier then lands in-band at a quarter of the base rate, so 1x is only sensible under host/chain oversampling). CPU scales ~linearly with the factor. Invalid/non-power-of-two values are ignored. getLatency() reflects the new factor after this call.

Definition at line 297 of file TapeMachine.h.

◆ setSpeed()

template<FloatType T>

void dspark::TapeMachine< T >::setSpeed ( Speed s )

inlinenoexcept

Tape speed (changes EQ time constants, losses and head bump). Out-of-range values are clamped.

Definition at line 311 of file TapeMachine.h.

◆ setStandard()

template<FloatType T>

void dspark::TapeMachine< T >::setStandard ( Standard s )

inlinenoexcept

Equalization standard (NAB adds the LF time constant). Out-of-range values are clamped.

Definition at line 322 of file TapeMachine.h.

◆ setState()

template<FloatType T>

bool dspark::TapeMachine< T >::setState	(	const uint8_t *	data,
		size_t	size
	)

inline

Restores parameters from a blob (tolerant; rejects foreign ids).

Definition at line 416 of file TapeMachine.h.

◆ setWowFlutter()

template<FloatType T>

void dspark::TapeMachine< T >::setWowFlutter ( T amount )

inlinenoexcept

Wow & flutter depth [0, 1] (~0.25% peak pitch deviation at 1). Non-finite values are ignored.

Definition at line 351 of file TapeMachine.h.

The documentation for this class was generated from the following file:

TapeMachine.h

Public Types

Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ Speed

◆ Standard

Member Function Documentation

◆ getBias()

◆ getDrive()

◆ getHeadBump()

◆ getLatency()

◆ getLatencySamples()

◆ getLossEffects()

◆ getMix()

◆ getNoise()

◆ getOversamplingFactor()

◆ getSpeed()

◆ getStandard()

◆ getState()

◆ getWowFlutter()

◆ prepare()

◆ processBlock()

◆ reset()

◆ setBias()

◆ setDrive()

◆ setHeadBump()

◆ setLossEffects()

◆ setMix()

◆ setNoise()

◆ setOversampling()

◆ setSpeed()

◆ setStandard()

◆ setState()

◆ setWowFlutter()