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    • 6. 发明申请
    • Digital audio amplifier, an audio system including the same, and a method of amplifying an audio signal
    • 数字音频放大器,包括其的音频系统以及放大音频信号的方法
    • US20060100726A1
    • 2006-05-11
    • US11268420
    • 2005-11-07
    • Il-Joong KimJeoung-In Lee
    • Il-Joong KimJeoung-In Lee
    • G06F17/00H04H5/00
    • H03F3/217
    • A digital audio amplifier, an audio system including the same and a method of amplifying an audio signal that can reduce switching noise interference generated in a pulse width modulator are provided. The digital audio amplifier includes a selection circuit, a digital signal processor and a pulse width modulator. The selection circuit selects one of an audio data signal and a digitized broadcasting signal to output a digital input signal. The digital signal processor samples the digital input signal using one of a plurality of oversampling frequencies based on a local oscillator output signal and a separation signal to output a sampled digital signal. The pulse width modulator performs a pulse width modulation on the sampled digital signal.
    • 提供了一种数字音频放大器,包括该音频放大器的音频系统和放大可以减少在脉冲宽度调制器中产生的开关噪声干扰的音频信号的方法。 数字音频放大器包括选择电路,数字信号处理器和脉宽调制器。 选择电路选择音频数据信号和数字化广播信号之一以输出数字输入信号。 数字信号处理器使用基于本地振荡器输出信号和分离信号的多个过采样频率之一对数字输入信号进行采样,以输出采样的数字信号。 脉冲宽度调制器对采样的数字信号执行脉宽调制。
    • 7. 发明授权
    • CPE alert signal detector and caller identification detector using peak detection
    • CPE警报信号检测器和使用峰值检测的呼叫者识别检测器
    • US06480589B1
    • 2002-11-12
    • US09353102
    • 1999-07-14
    • Jeung-in LeeYoung-ho ShinIl-joong KimChung-gil YangYank-gyun Kim
    • Jeung-in LeeYoung-ho ShinIl-joong KimChung-gil YangYank-gyun Kim
    • H04M156
    • G11C16/26G11C2216/20H03D1/02H04L27/30
    • An amplitude modulation detector use peak detection. A CAS (Customer premise equipment Alert Signal) detection apparatus and a caller information detection apparatus use the peak detection and methods for CAS and the caller information detection. The CAS detection apparatus includes a mixing unit, an amplitude modulation detection unit, and a frequency discriminating unit. The mixing unit mixes two or more frequency components of the input signal to generate an amplitude modulated signal including a carrier and an envelope. The amplitude modulation detection unit measures the envelope. Also, the frequency discriminating unit detects whether the frequency of the envelope is in a predetermined range to discriminate whether the CAS is present. Thus, the existence of the CAS can be detected through a single path by mixing a dual tone CAS signal, and can be accurately detected by discriminating the frequency the envelope. Also, the amplitude detection unit capable of detecting the amplitude modulation signal of the CAS can be digitally implemented, so that the CAS detection apparatus can be implemented in a single chip without an external part, and the amplitude modulation detection unit can be applied to all the systems utilizing the amplitude modulation as well as the CAS detection apparatus.
    • 幅度调制检测器使用峰值检测。 CAS(客户驻地设备警报信号)检测装置和来电者信息检测装置使用CAS的峰值检测和方法以及呼叫者信息检测。 CAS检测装置包括混合单元,幅度调制检测单元和频率鉴别单元。 混合单元混合输入信号的两个或多个频率分量以产生包括载波和信封的幅度调制信号。 幅度调制检测单元测量信封。 此外,频率鉴别单元检测包络的频率是否处于预定范围以鉴别CAS是否存在。 因此,可以通过混合双音调CAS信号通过单个路径来检测CAS的存在,并且可以通过区分频率的信封来准确地检测CAS的存在。 此外,可以数字地实现能够检测CAS的幅度调制信号的振幅检测单元,从而可以在没有外部部分的情况下,在单个芯片中实现CAS检测装置,并且可以将幅度调制检测单元应用于所有 采用幅度调制的系统以及CAS检测装置。