Audio artifact noise masking
September 23, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and apparatus for adaptive power adjustment of mixed modulation radio transmission Noise suppression apparatus Speech signal distortion measurement which varies as a function of the distribution of measured distortion over time and frequency Noise estimating system for use with audio reproduction equipment Methods and apparatus for generating noise signals from speech signals Small portable apparatus with EL device producing reduced noise Radiotelephone voice control device, in particular for use in a motor vehicle Noise suppression circuit Patent #: 6647367 InventorAssigneeApplicationNo. 10065158 filed on 09/23/2002US Classes:455/67.13, Noise, distortion, or unwanted signal detection (e.g., quality control, etc.)381/73.1, SOUND OR NOISE MASKING704/228Post-transmissionExaminersPrimary: Nguyen, LeeAssistant: West, Lewis Attorney, Agent or FirmForeign Patent References
International ClassesH04B 1700H04B 110 AbstractA system and method of masking an objectionable artifact in a mobile telephone. The process starts by referring to the design characteristics of the mobile phone to determine the expected level and source of objectionable artifacts that will be apparent during operation of the mobile phone. The noise necessary to mask the objectionable artifact is then calculated. The masking noise signal is then created within the mobile telephone and superimposed over the objectionable artifact. The masking noise signal is typically created in a digital signal processor (DSP) resident within the mobile telephone using a pseudo-noise generator. The masking noise signal can be stored as a look-up table in the digital signal processor (DSP) of the mobile telephone. To further enhance the effectiveness of the masking process, the masking noise signal is filtered to best match the objectionable artifact. The masking noise signal can be low pass filtered for objectionable artifacts that are lower in frequency. The masking noise signal can be high pass filtered for objectionable artifacts that are higher in frequency. Or, the masking noise signal can be band pass filtered for objectionable artifacts regardless of frequency. In an alternative embodiment, the masking noise signal can be created as a band-limited masking noise signal created within a pre-determined frequency bandwidth correlated to the frequency bandwidth of the objectionable artifact.Other References
Field of SearchPost-transmissionNoise Noise, distortion, or unwanted signal detection (e.g., quality control, etc.) Distortion, noise, or other interference prevention, reduction, or compensation Having measuring, testing, or monitoring of system or part Radiotelephone equipment detail Undesired signal or noise control (e.g., antistatic) Balancing or cancelling Noise or interference elimination Internally generated noise or oscillations Unwanted oscillation or radiation prevention SOUND OR NOISE MASKING | |
