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Architecture for an AM/FM digital intermediate frequency radio
Architecture for an AM/FM digital intermediate frequency radio
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机译:AM / FM数字中频无线电的架构
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摘要
An AM/FM DIF radio has an IF to audio converter that provides an audio signal from an IF signal responsive to a clock signal. During the processing of the IF signal, a spurious signal is intentionally generated. The spurious signal is based on the predetermined offset which is included in the IF signal applied to an A/D converter. The predetermined offset is greater than or equal to half of the AM bandwidth and less than or equal to the system bandwidth. The spurious signal is generated at a frequency proportional to the sum of an imprecision offset and the predetermined offset. A low pass filter removes the spurious signal while preserving the desired portion of the audio signal.
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机译:AM / FM DIF无线电具有IF到音频转换器,该模块响应时钟信号从IF信号提供音频信号。在IF信号的处理期间,有意产生了寄生信号。寄生信号基于预定偏移,该预定偏移包括在应用于A / D转换器的IF信号中。预定偏移量大于或等于AM带宽的一半,并且小于或等于系统带宽。伪信号以与不精确偏移量和预定偏移量之和成比例的频率生成。低通滤波器在保留音频信号的所需部分的同时去除了杂散信号。
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