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<?php
declare(strict_types = 1);
namespace ExtendedStrings\Strings;
class Cent
{
/**
* Returns the number of cents between two frequencies.
*
* @param float $lower The lower frequency (in Hz).
* @param float $upper The upper frequency (in Hz).
* @return float
*/
public static function frequenciesToCents(float $lower, float $upper): float
return Math::isZero($lower) ? 0 : 1200 * (log($upper / $lower) / log(2));
}
* Converts a frequency to a number of cents above C4.
* @param float $frequency The frequency to convert.
* @param float $A4 The reference frequency of A4 (defaults to 440).
public static function frequencyToCents(float $frequency, float $A4 = 440.0): float
return self::frequenciesToCents($A4, $frequency) + 900;
* Calculates the frequency of a number of cents above a base frequency.
* @param float $cents A number of cents.
* @param float $base The base frequency (in Hz).
* @return float The calculated frequency (in Hz).
public static function centsToFrequency(float $cents, float $base): float
return $base * pow(2, $cents / 1200);
extended-strings /
strings
