sbl::signal Namespace Reference

Classes
struct	Frame

Functions
float	exp_mod (float base, float mod, float depth, float lo=20.0f, float hi=20000.0f)
void	exp_mod_block (const float *mod, float *freq_out, uint16_t n, float base, float depth, float lo=20.0f, float hi=20000.0f)

Function Documentation

exp_mod()

float sbl::signal::exp_mod ( float  base, float  mod, float  depth, float  lo = 20.0f, float  hi = 20000.0f  )

inline

Apply exponential modulation to a base frequency (scalar).

Converts a normalized modulation signal to a frequency via: freq = base * 2^(mod * depth)

At depth = 2.0 and mod = 1.0, output is base * 4 (2 octaves up). At depth = 2.0 and mod = -1.0, output is base / 4 (2 octaves down). The relationship is perceptually uniform — equal mod deltas produce equal musical intervals regardless of the base frequency.

Parameters

base	Center frequency in Hz (e.g., filter cutoff)
mod	Normalized modulation value, typically [-1.0, 1.0]
depth	Modulation depth in octaves (e.g., 2.0 = ±2 octaves)
lo	Minimum output frequency in Hz (default 20)
hi	Maximum output frequency in Hz (default 20000)

Returns

Modulated frequency in Hz, clamped to [lo, hi]

Definition at line 49 of file exp_mod.hpp.

References sbl::dsp::fast_exp2f().

Referenced by exp_mod_block(), and sbl::widgets::proc::Svf::process_modulated().

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exp_mod_block()

void sbl::signal::exp_mod_block ( const float *  mod, float *  freq_out, uint16_t  n, float  base, float  depth, float  lo = 20.0f, float  hi = 20000.0f  )

inline

Apply exponential modulation to an entire block (buffer version).

Writes modulated frequencies to freq_out[] for each sample. Use this when you need the frequency buffer for direct coefficient computation (e.g., feeding into a filter's set_cutoff per-sample).

Parameters

mod	Normalized modulation signal buffer [-1.0, 1.0]
freq_out	Output frequency buffer (Hz)
n	Frame count
base	Center frequency in Hz
depth	Modulation depth in octaves
lo	Minimum output frequency in Hz (default 20)
hi	Maximum output frequency in Hz (default 20000)

Definition at line 70 of file exp_mod.hpp.

References exp_mod().

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