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发明授权
US5694517A Signal discrimination circuit for determining the type of signal transmitted via a telephone network 失效
用于确定通过电话网络发送的信号类型的信号鉴别电路

Signal discrimination circuit for determining the type of signal transmitted via a telephone network
摘要：
A signal discrimination circuit for discriminating between a voice signal and a voiceband data signal that is transmitted over a telephone network. The signal discrimination circuit includes an electric power judgement unit, a zero-crossing number judgement unit, a sub-band power calculation unit, a tone detection unit, and a discriminated result output unit. The electric power judgement unit determines whether an input signal is a voice signal or a voiceband data signal based on an interblock electric power ratio of the input signal. The zero-crossing number judgement unit determines whether the input signal is a voice signal or a voiceband data signal based on a zero-crossing number of the input signal. The sub-band power calculation unit analyzes the input signal with a spectrum analyzer to generate a spectrum analyzed result and calculates sub-band powers using the spectrum analyzed result, and the tone detection unit determines a presence and absence of a tone signal based on the sub-band powers calculated by the sub-band power calculation unit. Based on determined results of the electric power judgement unit, the zero-crossing number judgement unit, and the tone detection unit, the discriminated result output unit determines whether the input signal is a voice signal or a voiceband data signal and outputs a judged result.
摘要（中）：

一种信号鉴别电路，用于鉴别通过电话网络发送的语音信号和语音频带数据信号。 信号鉴别电路包括电力判断单元，过零数判断单元，子带功率计算单元，音调检测单元和鉴别结果输出单元。 电力判断单元基于输入信号的块间电力比来确定输入信号是语音信号还是语音带数据信号。 过零数判断单元基于输入信号的过零数来确定输入信号是语音信号还是语音带数据信号。 子带功率计算单元利用频谱分析器对输入信号进行分析，生成频谱分析结果，并使用频谱分析结果计算子频带功率，并且基于该频带分析结果，音调检测单元确定是否存在音调信号 由子带功率计算单元计算的子带功率。 基于电力判断单元，过零次数判断单元和音调检测单元的确定结果，判别结果输出单元确定输入信号是语音信号还是语音带数据信号，并输出判断结果。

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