I'm aware that input noise isn't factored when talking about measurement. Having said this, how is sound distortion measured and what does 1% sound distortion mean? I'm saying this with the understanding that we still have different types of distortion.
Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
Actually, noise is usually factored in when making distortion measurements. One should know the noise floor, and realize that beneath it, harmonics and other distortions are "invisible" to the measurement gear. They are said to be lost "below the noise floor." The term THD+N is total harmonic distortion plus noise.
This gets me confused at times. Much as THD comprises of all harmonic distortion products in a measurement, how does it differ from selective harmonic distortion?
Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
Some harmonics are more discordant than others. Odd harmonics sound worse than even harmonics do, and higher harmonics sound more edgy than lower ones. So if you have 5% second harmonic in one environment and 3% fifth harmonic in another, the latter will sound worse even though the percentage of distortion in the first case is higher.
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