Patent ID: 9583091
Date: 2017-02-28
CPC Classifications: G10K

Claim:
1. A method for masking noise originating from rotary equipment in a vehicle engine, the method comprising: checking if one or more engine input conditions fulfill one or more engine input condition threshold values; and if the one or more engine input conditions fulfill the one or more engine input condition threshold values, measuring a sound spectrum originating from the rotary equipment and the vehicle engine inside a compartment by means of at least one microphone; calculating a first tone/noise amplitude ratio between the amplitude of a first specific noise frequency determined by the input conditions and the amplitude of ambient sound in a DSP from the measured sound spectrum; and if the first tone/noise amplitude ratio exceeds a predetermined tone/noise amplitude ratio threshold value, outputting a first masking noise from the at least one speaker, wherein the first masking noise comprises a first central frequency, a first bandwidth and a first amplitude, wherein the first central frequency is the first specific noise frequency, and the first amplitude is determined by the tone/noise amplitude ratio.