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公开(公告)号：US08102959B2
公开(公告)日：2012-01-24
申请号：US13092616
申请日：2011-04-22
IPC分类号： H04L7/00
CPC分类号： G10L19/02
摘要： A digital audio processing system includes an input to receive a phase component of a signal. The digital audio processing system includes symbol recognition logic to adjust a sample of the phase component using an offset value. The symbol recognition logic maps the adjusted sample to a nearest predetermined phase value of a plurality of predetermined phase values. The symbol recognition logic determines a symbol using a difference between the nearest predetermined phase value and a prior nearest predetermined phase value. The prior nearest predetermined phase value corresponds to a prior sample of the phase component of the signal. The offset value is based on a detected error of the prior sample of the phase component of the signal. The digital audio processing system also includes an output to provide a second signal that indicates the symbol.
摘要翻译： 数字音频处理系统包括用于接收信号的相位分量的输入。 数字音频处理系统包括使用偏移值来调整相位分量的采样的符号识别逻辑。 符号识别逻辑将经调整的样本映射到多个预定相位值的最近的预定相位值。 符号识别逻辑使用最近的预定相位值和先前最近的预定相位值之间的差来确定符号。 先前最近的预定相位值对应于信号的相位分量的先前采样。 偏移值基于信号的相位分量的先前样本的检测误差。 数字音频处理系统还包括提供指示符号的第二信号的输出。
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公开(公告)号：US20080147762A1
公开(公告)日：2008-06-19
申请号：US11641564
申请日：2006-12-19
IPC分类号： G06F17/10
CPC分类号： G10L19/02
摘要： A digital audio processing system and method is disclosed. In an embodiment, the digital audio processing system can include a phase detector to sample an input signal and provide an output to adjust a decimation rate of an input signal. In another embodiment, the digital audio processing system can include symbol recognition logic to determine a symbol using a difference between a nearest predetermined phase value to a sample and a nearest predetermined phase value to a prior sample.
摘要翻译： 公开了一种数字音频处理系统和方法。 在一个实施例中，数字音频处理系统可以包括相位检测器以对输入信号进行采样并提供输出以调整输入信号的抽取率。 在另一个实施例中，数字音频处理系统可以包括符号识别逻辑，以使用最接近样本的预定相位值与最近的预定相位值之间的差值来确定符号。
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公开(公告)号：US07774079B2
公开(公告)日：2010-08-10
申请号：US11242404
申请日：2005-10-03
IPC分类号： G06F17/00
CPC分类号： G10L19/26
摘要： A system and method for decoding a received television signal is disclosed. The system includes an input to receive a digital audio signal and a digital variable deemphasis module to modify the amplitude of the digital audio signal based on a plurality of variable coefficients. The system also includes an exponential digital root mean square (ERMS) detector to provide level detection of the digital audio signal. The plurality of variable coefficients of the digital variable deemphasis module are digitally computed based on an output of the digital ERMS detector.
摘要翻译： 公开了一种用于解码所接收的电视信号的系统和方法。 该系统包括用于接收数字音频信号的输入端和数字可变去加重模块，用于基于多个可变系数来修改数字音频信号的振幅。 该系统还包括指数数字均方根（ERMS）检测器，用于提供数字音频信号的电平检测。 数字可变去加重模块的多个可变系数基于数字ERMS检测器的输出进行数字计算。
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公开(公告)号：US20080144743A1
公开(公告)日：2008-06-19
申请号：US11641995
申请日：2006-12-19
CPC分类号： H04L27/3845 , H04L27/2331
摘要： A demodulator system and method is disclosed. In an embodiment, the demodulator system can include a Coordinate Rotation Digital Computer (CORDIC) mixer to mix a first signal substantially to baseband using a first input frequency and to mix a second signal substantially to baseband using a second input frequency. In another embodiment, the demodulator system can include a phase detector to receive a pilot signal and to generate a control signal to adjust a decimation rate based on the pilot signal. In another embodiment, the demodulator system can include a symbol decoder to determine a symbol from a phase signal.
摘要翻译： 公开了一种解调器系统和方法。 在一个实施例中，解调器系统可以包括坐标旋转数字计算机（CORDIC）混频器，以使用第一输入频率将第一信号基本上与基带混频，并且使用第二输入频率将基本上与基带的第二信号混合。 在另一个实施例中，解调器系统可以包括相位检测器，用于接收导频信号并产生控制信号以根据导频信号来调节抽取率。 在另一个实施例中，解调器系统可以包括符号解码器，以从相位信号确定符号。
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公开(公告)号：US20080144740A1
公开(公告)日：2008-06-19
申请号：US11641994
申请日：2006-12-19
CPC分类号： G06F7/4818
摘要： A digital mixer system and method is disclosed. In an embodiment, a digital mixer can receive a modulated signal having a sample rate approximately equal to a clock rate divided by an integer factor. The digital mixer can include a first mixing stage having a first plurality of Coordinate Rotation Digital Computer (CORDIC) elements to serially perform a predetermined number of consecutive CORDIC iterations per clock cycle. The first mixing stage can further have logic to selectively process data received from an output of the first mixing stage. The digital mixer can also include a second mixing stage having a second plurality of CORDIC elements to serially perform a number of consecutive CORDIC iterations per clock cycle. The second mixing stage can also have logic to selectively process data received from an output of the first mixing stage and from an output of the second mixing stage.
摘要翻译： 公开了一种数字混合器系统和方法。 在一个实施例中，数字混合器可以接收具有大约等于时钟频率除以整数因子的采样率的调制信号。 数字混合器可以包括具有第一多个坐标旋转数字计算机（CORDIC）元件的第一混合级，以在每个时钟周期串行地执行预定数量的连续CORDIC迭代。 第一混合阶段还可以具有选择性地处理从第一混合阶段的输出接收的数据的逻辑。 数字混合器还可以包括具有第二多个CORDIC元件的第二混合级，以在每个时钟周期串行地执行多个连续的CORDIC迭代。 第二混合阶段还可以具有选择性处理从第一混合阶段的输出和第二混合阶段的输出接收的数据的逻辑。
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公开(公告)号：US20110194661A1
公开(公告)日：2011-08-11
申请号：US13092616
申请日：2011-04-22
IPC分类号： H04L7/00
CPC分类号： G10L19/02
摘要： A digital audio processing system includes an input to receive a phase component of a signal. The digital audio processing system includes symbol recognition logic to adjust a sample of the phase component using an offset value. The symbol recognition logic maps the adjusted sample to a nearest predetermined phase value of a plurality of predetermined phase values. The symbol recognition logic determines a symbol using a difference between the nearest predetermined phase value and a prior nearest predetermined phase value. The prior nearest predetermined phase value corresponds to a prior sample of the phase component of the signal. The offset value is based on a detected error of the prior sample of the phase component of the signal. The digital audio processing system also includes an output to provide a second signal that indicates the symbol.
摘要翻译： 数字音频处理系统包括用于接收信号的相位分量的输入。 数字音频处理系统包括使用偏移值来调整相位分量的采样的符号识别逻辑。 符号识别逻辑将经调整的样本映射到多个预定相位值的最近的预定相位值。 符号识别逻辑使用最近的预定相位值和先前最近的预定相位值之间的差来确定符号。 先前最近的预定相位值对应于信号的相位分量的先前采样。 偏移值基于信号的相位分量的先前样本的检测误差。 数字音频处理系统还包括提供指示符号的第二信号的输出。
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公开(公告)号：US20110022649A1
公开(公告)日：2011-01-27
申请号：US12895170
申请日：2010-09-30
IPC分类号： G06F17/17
CPC分类号： G10L19/02
摘要： A method includes receiving first data corresponding to a first signal sampled at a first sample rate, decimating the first data to provide a second signal sampled at a second sample rate, and recovering a pilot signal from the second signal. The method also includes evaluating the pilot signal to determine an error value, where the error value is based on a comparison of a sample of the pilot signal to zero. The method also includes adjusting the second sample rate based on the error value.
摘要翻译： 一种方法包括接收对应于以第一采样率采样的第一信号的第一数据，抽取第一数据以提供以第二采样率采样的第二信号，以及从第二信号恢复导频信号。 该方法还包括评估导频信号以确定误差值，其中误差值基于导频信号的采样与零的比较。 该方法还包括基于误差值调整第二采样率。
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公开(公告)号：US07518661B2
公开(公告)日：2009-04-14
申请号：US11240332
申请日：2005-09-30
CPC分类号： H04N5/46 , H04N5/60 , H04N21/42607 , H04N21/4383 , H04N21/8106
摘要： A system and method for detecting a mode of an audio signal is disclosed. The system includes an integrated circuit with an input to receive a signal and an audio processor coupled to the input. The audio processor includes an audio standard detection module, wherein the audio standard detection module detects a characteristic of the received signal that identifies a television audio standard by measuring the energy level of a plurality of different frequency bands of the received signal.
摘要翻译： 公开了一种用于检测音频信号的模式的系统和方法。 该系统包括具有用于接收信号的输入和耦合到输入的音频处理器的集成电路。 音频处理器包括音频标准检测模块，其中音频标准检测模块通过测量接收信号的多个不同频带的能量水平来检测识别电视音频标准的接收信号的特征。
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公开(公告)号：US20090015714A1
公开(公告)日：2009-01-15
申请号：US11825841
申请日：2007-07-09
IPC分类号： H04N7/00
CPC分类号： H04N5/60 , H04N7/06 , H04N21/4394 , H04N21/4396
摘要： A system and method for demodulating signals are disclosed. In a particular embodiment, the method includes receiving a signal at an input and determining a first noise estimate of the signal. The method also includes providing a first output indicating a second noise estimate of the signal at a primary carrier frequency and providing a second output indicating a third noise estimate of the signal at a secondary carrier frequency.
摘要翻译： 公开了一种用于解调信号的系统和方法。 在特定实施例中，该方法包括在输入处接收信号并确定信号的第一噪声估计。 该方法还包括提供指示在主载波频率处的信号的第二噪声估计的第一输出，并提供指示辅助载波频率处的信号的第三噪声估计的第二输出。
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公开(公告)号：US08477248B2
公开(公告)日：2013-07-02
申请号：US11825841
申请日：2007-07-09
CPC分类号： H04N5/60 , H04N7/06 , H04N21/4394 , H04N21/4396
摘要： A system and method for demodulating signals are disclosed. In a particular embodiment, the method includes receiving a signal at an input and determining a first noise estimate of the signal. The method also includes providing a first output indicating a second noise estimate of the signal at a primary carrier frequency and providing a second output indicating a third noise estimate of the signal at a secondary carrier frequency.
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