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指出了数字语音光纤接收机的一般结构,提出了设计的方法,并以CIRRUS公司推出的立体声音频解码芯片CS4334为例给出了设计过程.设计实例适合于车载音响等易受干扰的系统. 相似文献
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介绍了16bit立体声数字音频信号编解码器CS4218与DSP56F826芯片组成的音频信号数字处理接口,给出了相应的应用电路接口设计和部分软件框图。 相似文献
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Serap Kirbiz Yener Ulker Bilge Gunsel 《AEUE-International Journal of Electronics and Communications》2009,63(2):92-102
Conventional blind audio watermark (WM) decoders use matched-filtering techniques because of their simplicity. In these methods, WM decoding and WM detection are often considered as separate problems and the WM signal embedded by spreading a secret key through the spectrum of a host signal is extracted by maximizing correlation between the secret key and the received audio. Conventionally decoding is achieved by using a pre-defined decoding/detection threshold and tradeoff between the false rejection ratio and false acceptance ratio constitutes main drawback of the conventional decoders. Unlike the conventional methods, this paper introduces a pattern recognition (PR) framework to WM extraction and integrates WM decoding and detection problems into a unique classification problem that eliminates thresholding. The proposed method models statistics of watermarked and original audio signals by a Gaussian mixture model (GMM) with K components. Learning of the embedded WM data is achieved in a principal component analysis (PCA) transformed wavelet space and a maximum likelihood (ML) classifier is designed for WM decoding. Robustness of the proposed method is evaluated under compression, additive noise and Stirmark benchmark attacks. It is shown that both WM decoding and detection performances of the introduced decoder outperform the conventional decoders. 相似文献
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CS8 8 31CN是用于语音录放的单片CMOSLSI,采用ADM (自适应增量调制 )。它与动态RAM以及包括话筒、扬声器、放大器等的音频电路共同构成一个完整的语音录放系统。 相似文献
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