Invention Grant
- Patent Title: Modulation of audio signals in a parametric speaker
- Patent Title (中): 在参数化扬声器中调制音频信号
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Application No.: US13427614Application Date: 2012-03-22
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Publication No.: US08976980B2Publication Date: 2015-03-10
- Inventor: Ryo Tsutsui , Keitaro Hashimoto
- Applicant: Ryo Tsutsui , Keitaro Hashimoto
- Applicant Address: US TX Dallas
- Assignee: Texas Instruments Incorporated
- Current Assignee: Texas Instruments Incorporated
- Current Assignee Address: US TX Dallas
- Agent Mirna Abyad; Frederick J. Telecky, Jr.
- Main IPC: H03G5/00
- IPC: H03G5/00 ; H03C1/00

Abstract:
Methods and systems for amplitude modulation in a parametric speaker system are provided that perform truncated double sideband (TDSB) frequency modulation of audio signal in which most of the processing is performed in the frequency domain, thus permitting use of fast processing techniques for amplitude modulation (AM) and filtering and reducing computation cost over time domain processing. A maximum envelope value of the time domain audio signal may be to the carrier signal in the frequency domain that avoids emitting the carrier signal when the input signal level is low or mute. The application of the envelope value may be smoothed to reduce discontinuity at input block boundaries.
Public/Granted literature
- US20120243708A1 Modulation of Audio Signals in a Parametric Speaker Public/Granted day:2012-09-27
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