TMS320VC5509A and aic23b chip have problems collecting noise signal frequency

tianyehu

TMS320VC5509A and aic23b chip have problems collecting noise signal frequency [Copy link]

The 5509A chip collects a 300Hz sine signal, but why does the graph show around 250Hz instead of 300Hz? Why?

tianyehu

The sampling rate is set to:

Uint16 digital_audio_inteface_format[2] = {0x0e, 0x53};
/*AIC23 baud rate setting, sampling rate is 8K*/
Uint16 sample_rate_control[2] = {0x10, 0x2e};
/*AIC23 register reset*/
Uint16 reset[2] = {0x1e, 0x00};
/*AIC23 power saving mode setting, all parts are in working state*/
Uint16 power_down_control[2] = {0x0c, 0x00};
/*AIC23 analog audio control
DAC enable, ADC input selection is Line, mic input, gain is 0*/
Uint16 analog_aduio_path_control[2] = {0x08, 0x1c};
/*AIC23 digital audio path control*/
Uint16 digital_audio_path_control[2] = {0x0a, 0x05};
/*AIC23 digital interface enable*/
Uint16 digital_interface_activation[2] = {0x12, 0x01};
/*AIC23 left channel audio adjustment*/
Uint16 left_line_input_volume_control[2] = {0x00, 0x17};
/*AIC23 right channel audio adjustment*/
Uint16 right_line_input_volume_control[2] = {0x02, 0x17};
/*AIC23 headphone left channel audio adjustment*/
Uint16 left_headphone_volume_control[2] = {0x05, 0xFF};
/*AIC23 headphone right channel audio adjustment*/
Uint16 right_headphone_volume_control[2] = {0x07, 0xFF};
/*Define McBSP handle*/

Jacktang

There's quite a difference

Correspondence between internal ADC digital quantity and analog quantity

Change the aic23b sampling rate

tianyehu

Jacktang posted on 2021-7-10 21:29 There is a big difference between the internal ADC digital quantity and the analog quantity. Change the aic23b sampling rate

Changing the sampling rate and the frequency of the signal still doesn't make them match?

Master, can I add QQ1558226345 for private chat? Please help me with the following question

tianyehu

tianyehu posted on 2021-7-10 21:41 Changing the sampling rate and the frequency of the signal, can't they match? Master, can you add QQ1558226345 for a private chat? I have a question for you

Don't sink.