无线通信终端FM收音机模块噪声抑制
Noise Suppression of Embeded FM Receiver in Wireless
Communication Terminal
摘要 某单位为无线通信终端设备添加调频收音机模块后,连接耳机,设置为工作状态,耳机输出刺耳噪声,收音机模块无法正常使用。通过耳机地线合理接地、时钟信号合理PCB走线、消除背光芯片频谱扩散等整改措施,有效抑制了调频收音机噪声,经实测信噪比达到49 dB,接上耳机,输出音质清晰。
关键词 调频收音机;噪声抑制;无线通信终端;耳机
Abstract When an FM receiver module was designed to improve functional attributes of
a wireless communication terminal, the headphone connected to the FM receiver
produced the noise and could not run normally. By grounding the ground lead of
headphone with reasonable way, rationally routing PCB layout of the clock signal,
and eliminating spectrum spreading of backlight IC, the noise of FM receiver was
suppressed and the ratio of signal to noise could reach 49 dB. Finally, the FM receiver
could output signals with high acoustic fidelity.
Keywords FM receiver;noise suppression;wireless communication terminal;
headphone
本期目录
- 从“能源之星”看检测和认证在节...
- 要闻
- 锂离子电池的洗涤安全测试研究 ...
- 锂离子电池高温使用安全测试研究...
- 手机辐射抗扰测试结果一致性分析...
- ECE R10.04...
- YD/T 1312....
-
新版谐波电流标准解析
- CE/FCC/MIC认证中辐射...
- 澳大利亚/新西兰的RCM要求及...
- 无线通信终端FM收音机模块噪声...
- 测量U形建筑基础接地电阻的有限...
- 总体方案阶段星载天线电磁兼容的...
- 导电PBO织物的制备及其吸波性...
- 两种粒径Fe79.7...
- 手机及基站远场辐射安全距离计算...
- EMC试验中浪涌波形校验方法研...
-
外部干扰的抑制(七)
- 2011 IEEE&...
- 数字中频EMI接收机可提高EM...
- 中国电子科学研究院系统电磁效能...
- 关于IEC 6134...