System and method for stereo sound field expansion
AssigneeAltec Lansing Technologies, A Division of Plantronics, Inc.
InventorJames Albert
Life of this patent
Estimating the term…
Abstract
A system and method for enhancing the stereo sound effect produced by speaker systems having two or more speakers fed by two or more channels or audio, respectively. Second-order high pass filtering is applied to first and second audio signals of a stereo signal. A phase shift of approximately 180 degrees is applied to the resulting signals. A mixer mixes the processed first audio signal with the original second audio signal and mixes the processed second audio signal with the original first audio signal, whereby an expanded stereo sound field effect is created.
Claims32
A method for providing an improved stereo image in an audio system, comprising:
- high-pass filtering a first audio signal to create a first filtered audio signal;
- high-pass filtering a second audio signal to create a second filtered audio signal;
- reversing a phase of the first filtered audio signal to create a first phase-reversed audio signal;
- reversing a phase of the second filtered audio signal to create a second phase-reversed audio signal;
- mixing the first phase-reversed audio signal with the second audio signal;
- and,
- mixing the second phase-reversed audio signal with the first audio signal.
A system for providing an improved stereo image in an audio system:
- an electronic filtering device that removes a first low-frequency component of a first audio signal and a second low-frequency component of a second audio signal, whereby first and second filtered audio signals are created;
- an electronic phase-reversing device which reverses a phase of the first filtered audio signal and which reverses a phase of the second filtered audio signal to create first and second phase-reversed audio signals;
- a mixer configured to mix the first phase-reversed audio signal with the second audio signal, the mixer further mixing the second phase-reversed audio signal with the first audio signal.
Dependencies are inferred from the claim text.