Prominent Tone Analyzer
Prominent Tone Analyzer
The Nelson Acoustics Prominent Tone Analyzer (PTA) conducts Tone to Noise (TNR) and Prominence Ratio (PR) analysis as defined by industry standards such as ANSI S1.13, ISO 7779 and ECMA-74. The TNR and PR metrics are utilized to judge the prominence of tonal components in the noise emission spectra of the product for both regulatory declaration and customer acceptance.
The PTA reads from text based FFT analysis data files. The analyzer is programmed to import FFT files generated by the Nelson Acoustics Trident application but can be used with an FFT data file that is generated by any analyzer as long as the data is written or assembled in the proper text file format.
The PTA conducts both TNR and PR on every FFT line and generates a plot of TNR vs Frequency and PR vs Frequency, facilitating quick analysis of FFT files. An interactive user interface with cursor controls allows for detailed study of tones and the masking noise that surrounds them. The program logic allows users to analyze both single tone and multiple tones in the same critical band.
PTA analysis results are written to a Tone Table which may then be exported into an MSExcel workbook. Nelson Acoustics Trident users can export their prominent tone analysis results in the same MSExcel spreadsheet used for their Trident Results.
Several PTA screenshots are shown below:
