class SPCore::Gain
Provide utility functions to convert between a linear and decibel (logarithm) unit.
Constants
- MAX_DB_ABS
Public Class Methods
db_to_linear(db)
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Convert a decibel value to a linear value.
# File lib/spcore/util/gain.rb, line 9 def self.db_to_linear db db_abs = db.abs raise ArgumentError, "decibel value #{db} is more than allowed maximum #{MAX_DB_ABS}" if db_abs > MAX_DB_ABS raise ArgumentError, "decibel value #{db} is less than allowed minimum #{-MAX_DB_ABS}" if db_abs < -MAX_DB_ABS return 10.0**(db / 20.0) end
linear_to_db(linear)
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Convert a linear value to a decibel value.
# File lib/spcore/util/gain.rb, line 17 def self.linear_to_db linear raise ArgumentError, "linear value #{linear} is less than 0.0" if linear < 0.0 if linear == 0.0 return -MAX_DB_ABS else return 20.0 * Math::log10(linear) end end