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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 8050434 | Multi-channel audio enhancement system A method for processing audio signals can include receiving left and right front audio signals, where the left and right front audio signals including information about front spatial position of sound sources relative to a listener. The method can also include recei... | 11/01/2011 |
| 8046093 | System and method for enhanced streaming audio A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sourc... | 10/25/2011 |
| 8027477 | Systems and methods for audio processing Systems and methods for audio signal processing are disclosed, where a discrete number of simple digital filters are generated for particular portions of an audio frequency range. Studies have shown that certain frequency ranges are particularly important for human ... | 09/27/2011 |
| 7987281 | System and method for enhanced streaming audio A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sourc... | 07/26/2011 |
| 7912231 | Systems and methods for reducing audio noise Various embodiments of systems and methods for reducing audio noise are disclosed. One or more sound components such as noise and network tone can be detected based on power spectrum obtained from a time-domain signal. Results of such detection can be used to make d... | 03/22/2011 |
| 7907736 | Acoustic correction apparatus An acoustic correction apparatus processes a pair of left and right input signals to compensate for spatial distortion as a function of frequency when said input signals are reproduced through loudspeakers in a sound system. The sound-energy of the left and right in... | 03/15/2011 |
| 7801734 | Systems and methods of remotely enabling sound enhancement techniques A system and method of remotely enabling sound enhancement techniques is disclosed. In an embodiment, a watermark is embedded in an encoded multi-channel audio stream to remotely enable an enhancement decoder portion of a multi-channel audio decoder. ... | 09/21/2010 |
| 7778427 | Phase compensation techniques to adjust for speaker deficiencies In an embodiment, a phase compensation system shifts the phase of an audio signal in a mid-range frequency band to compensate for phase distortion created when an electrical audio signal is converted to audio by an electronic transducer, such as a loudspeaker. An au... | 08/17/2010 |
| 7764802 | Frequency-warped audio equalizer In certain embodiments, an improved audio equalization filter can be generated by frequency warping one or more digital filters having a plurality of frequency bands. Frequency warping can include, for example, transforming at least some of the frequency bands of th... | 07/27/2010 |
| 7720240 | Audio signal processing Systems and methods of processing audio signals are described. The audio signals comprise information about spatial position of a sound source relative to a listener. At least one audio filter generates two filtered signals for each of audio signal. The two filtered... | 05/18/2010 |
| 7636443 | Audio enhancement system A stereo enhancement system processes the difference signal component generated from a pair of left and right input signals to create a broadened stereo image reproduced through a pair of speakers or through a surround sound system. Processing of the difference sign... | 12/22/2009 |
| 7606716 | Systems and methods for multi-dialog surround audio Systems and processes for transmission of multi-channel audio from a sender to one or more recipients. Multi-channel audio is encoded with a plurality of different dialog channels. The encoded multi-channel audio and dialog channels can be compressed to facilitate t... | 10/20/2009 |
| 7555130 | Acoustic correction apparatus An acoustic correction apparatus processes a pair of left and right input signals to compensate for spatial distortion as a function of frequency when the input signals are reproduced through speakers in a sound system. The sound-energy of the left and right input s... | 06/30/2009 |
| 7522733 | Systems and methods of spatial image enhancement of a sound source Reproduction of stereophonic audio information over a single speaker requires summing multiple stereo channels. When signals having approximately equal magnitudes and approximately opposite phases at a frequency are added together, the audio information at the frequ... | 04/21/2009 |
| 7492907 | Multi-channel audio enhancement system for use in recording and playback and methods for providing same An audio enhancement system and method for use receives a group of multi-channel audio signals and provides a simulated surround sound environment through playback of only two output signals. The multi-channel audio signals comprise a pair of front signals intended ... | 02/17/2009 |
| 7467021 | System and method for enhanced streaming audio A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sourc... | 12/16/2008 |
| 7451093 | Systems and methods of remotely enabling sound enhancement techniques A system and method of remotely enabling sound enhancement techniques is disclosed. In an embodiment, a watermark is embedded in an encoded multi-channel audio stream to remotely enable an enhancement decoder portion of a multi-channel audio decoder. ... | 11/11/2008 |
| 7277767 | System and method for enhanced streaming audio A system and method for enhancement and management of streaming audio is disclosed. In one embodiment, the system provides a client-side decoder that is compatible with numerous audio formats, so that a user can enjoy relatively high-quality audio from various sourc... | 10/02/2007 |
| 7200236 | Multi-channel audio enhancement system for use in recording playback and methods for providing same An audio enhancement system and method for use receives a group of multi-channel audio signals and provides a simulated surround sound environment through playback of only two output signals. The multi-channel audio signals comprise a pair of front signals intended ... | 04/03/2007 |
| 7043031 | Acoustic correction apparatus An acoustic correction apparatus processes a pair of left and right input signals to compensate for spatial distortion as a function of frequency when the input signals are reproduced through speakers in a sound system. The sound-energy of the left and right input s... | 05/09/2006 |
| 7031474 | Acoustic correction apparatus An acoustic correction apparatus processes a pair of left and right input signals to compensate for spatial distortion as a function of frequency when said input signals are reproduced through loudspeakers in a sound system. The sound-energy of the left and right in... | 04/18/2006 |
| 6718039 | Acoustic correction apparatus An acoustic correction apparatus processes a pair of left and right input signals to compensate for spatial distortion as a function of frequency when the input signals are reproduced through speakers in a sound system. The sound-energy of the left and right input s... | 04/06/2004 |
| 5892830 | Stereo enhancement system A stereo enhancement system processes the difference signal component generated from a pair of left and right input signals to create a broadened stereo image reproduced through a pair of speakers or through a surround sound system. Processing of the diff... | 04/06/1999 |
