Trane TRG-TRC007-EN manual Phon and Sone

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period two

Sound Perception and

Rating Methods

notes

Phon and Sone

 

 

 

 

 

120

 

 

 

loudness level (phons)

 

 

 

 

 

 

 

120

 

 

Pam

 

 

 

 

 

 

 

100

 

 

 

 

110

 

 

 

 

 

 

 

 

 

20

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90

 

 

ref

80

 

 

 

 

 

 

 

 

 

 

80

 

 

dB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

70

 

 

pressure,

60

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

50

 

 

sound

 

 

 

 

40

 

 

20

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

10

 

10,000

 

20

50

100

200

500

1,000 2,000

5,000

 

 

 

 

 

frequency, Hz

 

Figure 31

The phon is another descriptor used to indicate loudness with a single number. The loudness of a sound, expressed in phons, is equal to the sound- pressure level of a standard sound, at 1,000 Hz, that is considered equally loud. For example, a sound pressure level of 40 dB at 1,000 Hz is considered to have a loudness of 40 phons. Any sound that falls on this same loudness curve, at any frequency, would also be described as having a loudness equal to 40 phons.

While the phon scale is logarithmic, the sone is the linear equivalent to the phon. In principle, the sone scale is linear when compared to the response of the human ear. For example, two sones is twice as loud as one sone, and half as loud as four sones.

While the phon and sone scales are not widely used, some HVAC equipment, primarily non-ducted fans and power ventilators, is still rated in sones. AMCA Standard 301, Methods for Calculating Fan Sound Ratings from Laboratory Test Data, provides a method for calculating the sone rating from octave-band data. Use caution when comparing equipment based on sones. Multiple methods exist for calculating a sone rating, and they provide different results.

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Contents Air Conditioning Clinic Fundamentals of Hvac Acoustics Business Reply Mail Comment Card One of the Fundamental SeriesFundamentals of Hvac Acoustics Preface Fundamentals of Hvac AcousticsContents TRG-TRC007-EN Fundamentals of Sound Fundamentals of SoundWhat is Sound? What is Sound?Sound Wave and Frequency Wavelength Broadband Sound Broadband Sound and TonesOctave Bands Octave BandsLogarithmic sums One-Third Octave Bands Sound Power and Sound Pressure Sound Power and Sound PressureAn Analogy DB = 10 log DecibelLogarithmic Scale 10 ´ logEquation for Sound Power Equation for Sound PressureLogarithmic Addition of Decibels 50 dB + 44 dB = 51 dBHuman Ear Sound Perception Rating MethodsHuman Ear Response Loudness Contours Single-Number Rating Methods Response to TonesSingle-Number Rating Methods C Weighting Sound Perception and Rating MethodsWeighting Example Weighting Noise Criteria NC Curves NC-39 Room Criteria RC Curves MPa DB ref Pressure Sound Perception and Rating Methods RC-31 R Phon and Sone Octave-Band Rating Method Octave-Band Rating MethodAcoustical Analysis Acoustical AnalysisSetting a Design Goal Setting a Design GoalAcoustical Analysis Acoustical Analysis Source-Path-Receiver AnalysisSource-Path-Receiver Model Typical Sound Paths AirborneExamples of a Single Sound Path Example of Multiple Sound PathsIdentifying Sound Sources and Paths Modeling Sound Paths Sound-Path ModelingSupply Algorithms for Sound-Path Modeling Computerized Analysis Tools Attenuation and Regeneration Terms Used in Sound-Path ModelingSound Transmission Insertion loss IL Noise reduction NR Transmission loss TL Absorption Reflected Sound Receiver Sound Correction Equipment Sound Rating Equipment Sound RatingFree Field Fields of Measurement= L p1 20 log Distance Correction in a Free FieldLot Near Field Reverberant Field Semireverberant Field Rating Hvac Equipment Hvac Equipment Sound RatingReverberant-Room Method Free-Field Method Industry Standards Ducted Air-Handling Equipment Air Handler Test Configurations Former Methods of Sound Testing ARI Standard Sound Power by Octave Band Review Review-Period OneReview-Period Two Noise criteria NC Room criteria RCReview-Period Three Review-Period Four Review Quiz Questions for PeriodOctave-band frequency, Hz Answers Glossary Glossary Room effect See receiver room correction Glossary Trane