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1.发明授权公开(公告)号：US07221301B2
公开(公告)日：2007-05-22
申请号：US11216292
申请日：2005-08-31
IPC分类号： H03M1/00
CPC分类号： H03M7/3008
摘要： A sigma delta digital-to-analog (D/A) converter system (10) includes a summing device (35) at an input of a D/A converter (30), and a low frequency low amplitude wave signal (31) injected at an input of the summing device that remains unfiltered and is used to suppress spurious tone artifacts. The D/A converter system can further include an amplitude control and a frequency control for selectively adjusting the frequency and the amplitude of the low frequency low amplitude wave signal being injected. Note, the low frequency low amplitude repeating wave signal generator can take the form of a digital signal processor (DSP) (37) having the appropriate software to generate such signals.
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公开(公告)号：US07110559B2
公开(公告)日：2006-09-19
申请号：US10702714
申请日：2003-11-06
摘要： The invention concerns a method (300) and system (100) for controlling audio output. The method includes the steps of inputting (312) an audio signal and a voltage level signal, measuring (314) the audio signal and the voltage level signal, mapping (316) the audio signal against at least one table (134) of predetermined corresponding gain targets (138) and selecting (318) at least one gain target for the audio signal. The mapping step and the selecting step are based at least in part on the measurement of the voltage level signal and the measurement of the audio signal. The method also includes the step of applying (320) the gain target to the audio signal.
摘要翻译： 本发明涉及一种用于控制音频输出的方法（300）和系统（100）。 该方法包括以下步骤：输入（312）音频信号和电压电平信号，测量（314）音频信号和电压电平信号，将音频信号与预定对应的至少一个表格（134）映射（316） 增益目标（138）和选择（318）音频信号的至少一个增益目标。 映射步骤和选择步骤至少部分地基于电压电平信号的测量和音频信号的测量。 该方法还包括将增益目标应用于（320）音频信号的步骤。
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公开(公告)号：US5749056A
公开(公告)日：1998-05-05
申请号：US522200
申请日：1995-08-31
CPC分类号： H04M1/6016 , H03G3/20
摘要： An audio ramping technique (200) reduces acoustic shock in radio (100) that has multiple operating modes each having a different nominal audio speaker level. The ramping technique (200) sets the audio speaker level to the same initial sound pressure level (SPL) (208) regardless of the mode of radio operation and then ramps the audio level (216) until either a user initiated control signal (212) is received or the audio level reaches a maximum threshold level (210).
摘要翻译： 音频斜坡技术（200）减少无线电（100）中的声学冲击，其具有多个操作模式，每个操作模式具有不同的标称音频扬声器水平。 斜坡技术（200）将音频扬声器电平设置为相同的初始声压级（SPL）（208），而不管无线电操作的模式，然后使音频电平（216）变高，直到用户发起控制信号（212） 或音频电平达到最大阈值电平（210）。
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4.发明授权公开(公告)号：US07224992B2
公开(公告)日：2007-05-29
申请号：US10683596
申请日：2003-10-10
CPC分类号： H04W84/08 , H04L65/1016 , H04L65/4061 , H04M1/05 , H04M1/6066 , H04R5/04
摘要： A stereo headset (104) with push-to-talk function can be interfaced with a wireless communication device (102) via a connector interface. The connector interface preferably includes a jack at the wireless communication device (102) and a compatible plug at the stereo headset (104). An electrical contact (310) at the connector interface can contemporaneously interconnect both electrical audio signals between the wireless communication device (102) and at least one of the speakers of the stereo headset (104) and electrical user input signals from an external push-to-talk user input device (232) to the wireless communication device (102).
摘要翻译： 具有一键通功能的立体声耳机（104）可以经由连接器接口与无线通信设备（102）接口。 连接器接口优选地包括在无线通信设备（102）处的插座和立体声耳机（104）处的兼容插头。 连接器接口处的电触点（310）可以同时互连无线通信设备（102）和立体声头戴耳机（104）的至少一个扬声器之间的电音频信号和来自外部推送的电用户输入信号 - 向用户输入设备（232）发送到无线通信设备（102）。
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公开(公告)号：US07089176B2
公开(公告)日：2006-08-08
申请号：US10400845
申请日：2003-03-27
IPC分类号： G10L21/00
摘要： A method, system and computer readable medium for increasing the audio perceptual loudness includes shifting at least one frequency of a first audio signal to create a second audio signal so as to increase the audio perceptual loudness. The power level of the second audio signal is not more than a power level of the first audio signal. The method also includes generating high-audio perceptual loudness tone alert sequences based on psychoacoustic and audiometric data. It further includes acquiring a listener's threshold audio profile; adding the listener's audio profile to the loudness sensitivity curve for producing the listener's tonal sensitivity curve; determining a required dB scaling for critical band tones from the listener's tonal sensitivity curve; normalizing the tonal sensitivity curve for creating a decibel curve; selecting a frequency range of the tones by using the tonal sensitivity curve; and spacing the sequence of tones along a critical band scale.
摘要翻译： 用于增加音频感知响度的方法，系统和计算机可读介质包括移动第一音频信号的至少一个频率以产生第二音频信号，以便增加音频感知响度。 第二音频信号的功率电平不大于第一音频信号的功率电平。 该方法还包括基于心理声学和听力数据产生高音频感知响度音警报序列。 它还包括获取听众的阈值音频配置文件; 将听众的音频配置文件添加到响度灵敏度曲线中，以产生听众的音调敏感度曲线; 从收听者的音调灵敏度曲线确定关键乐队音调所需的dB缩放; 归一化用于创建分贝曲线的色调敏感度曲线; 通过使用色调敏感度曲线选择色调的频率范围; 并沿着临界频带尺度间隔音调序列。
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