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嗨,
我正在使用STA321MP来录制音频信号,我在没有语音时观察到输出信号的噪音。期限约为20ms。你知道它来自哪里吗? 以上来自于谷歌翻译 以下为原文 Hi, I am using STA321MP to record the audio signal, I have observed the noise from its output signal when there is no speech. The period is ~20ms. Do you have any idea where it is from? |
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6个回答
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嗨,潘,
对于STA321MP,您可以控制输出通道的音量,请使用-80dB静音输出,然后再次检查输出噪音。 或者您可以断开麦克风PDM输出数据信号线,然后再次检查输出。 谢谢 YT 以上来自于谷歌翻译 以下为原文 hi Phan, for STA321MP , you are able to control volume of output channel , please use -80dB to mute output , then check the output noise again. or you can disconnect microphone PDM output data signal line , then check the output again. Thanks YT |
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嗨,
感谢聪明的建议! 我做同样的事情,噪音很清楚。 以上来自于谷歌翻译 以下为原文 Hi, Thank for the clever suggestion! I do the same and the noise is showed clearly. |
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嗨Phan,
你能告诉我STA321MP之后的信号路径吗? 你把I2S输出发送到DAC了吗? 如果是,请告诉我你的系统和I2S总线的时钟安排。 谢谢 , YT 以上来自于谷歌翻译 以下为原文 Hi Phan, Could you let me know the signal path after STA321MP ? did you send I2S output to a DAC ? if yes, please let me know your clock arrangement for system and I2S bus . Thanks , YT |
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嗨陶,
我正在使用STM32F7-DISCO板通过I2Sx和SPIx通道从STA321MP读取SDOxx。读取数据通过SAI流式传输到编解码器芯片组WM8994,以播放音频信号。 I2S / SPI总线的时钟约为1.025Mhz(16Khz * 32bit * 2音频通道)。 XTI的时钟由外部振荡器12.288 Mhz提供。 我当前的电路是否会产生噪音?我看到它与电源线信号(50hz)相关 我正在建造自己的电路板,我希望不会发生这种噪音。 以上来自于谷歌翻译 以下为原文 Hi Tao, I am using STM32F7-DISCO board to read SDOxx from STA321MP via I2Sx and SPIx channels. The reading data is streamed to codec chipset WM8994 via SAI to play-out the audio signal. The clock for I2S/SPI bus is ~1.025Mhz (16Khz*32bit*2 audio channels). The clock for XTI is supplied from external oscillator 12.288 Mhz. Is the noise caused by my current circuit? I see It correlates with power line signal(50hz) I am building my own board, I hope that kind of noise will not occur. |
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嗨Phan,
它看起来不像交流电源的50赫兹噪音,而是一些数字噪音,如爆米花。 根据您的描述,STA321MP的MCLK是由外部时钟源提供的,频率为12.288Mhz,您是否也将此osc用于STM32?由于STA321MP是从设备,I2S时钟(LRCK和BICK)应该由STM32(作为主设备)提供,如果MCLK与I2S时钟不同步,则会导致音频频段出现爆米花噪声。 谢谢 , YT 以上来自于谷歌翻译 以下为原文 Hi Phan, it doesn't look like 50 hz noise from AC power supply , but some digital noise , like pop corn. according to your discription, the MCLK for STA321MP had been provided from external clock source and freq is 12.288Mhz , did you also use this osc for STM32 ? due to STA321MP was a slave device, the I2S clock ( LRCK and BICK) should be provided from STM32 ( as master ), if MCLK was not synchronized with I2S clock , it will lead to pop corn noise in audio band . Thanks , YT |
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感谢您的评论!我明白了你的观点。
STM32正在使用25Mhz osc。它们现在不是同一个时钟。我上次尝试从STM32向STA321MP提供MCLK。但由于某些原因,它上次没有用。现在,我将恢复该选项并检查,但我不认为这是根本原因。因为当我移除麦克风或为STA321MP的输出设置MUTE时,我得到相同的噪声信号。据我所知,即使时钟不同步,所有音频信号为0都可以无噪音地工作。如果我错了,请纠正。 以上来自于谷歌翻译 以下为原文 Thank for the comments! I got your point. STM32 is using 25Mhz osc. They are not the same clock now. I tried to provide MCLK to STA321MP from STM32 last time. But for some reasons, it didn't work last time. Now, I will revert to that option and check but I don't think it is the root cause. Since when I removed Microphones or set MUTE for STA321MP's output, I get same noise signal. As far as my understanding, all audio signal is 0 would work without noise even the clock is not synchronize. Please correct if I am wrong. |
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