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He proposed that the harmonics of tones related by small integer frequency ratios either coincide or are widely spaced and thus do not interfere with each other at the auditory receptor surface . The critical frequencies of the conducted disturbances emitted are the 2 nd and 3rd harmonics of the transmitted signal ( 265 KHz and 497.5 kHz for the channel at 132.5 kHz ) the harmonics of the working frequency of the power supply regulator and two spurious tones centered at 1.3 MHz ( + / - the channel frequency ) produced by the direct synthesis technique used for the transmitted signal generation . Effective air gap , air-gap and saturation harmonics , development of hybrid circuit model , analysis and applications . This method allows users to obtain the quality of a spherical harmonics , or Pn solution , while exploiting the efficiency and better parallelizability of the Sn method .