{"id":180,"date":"2021-05-01T21:32:07","date_gmt":"2021-05-02T01:32:07","guid":{"rendered":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/?p=180"},"modified":"2021-05-01T21:32:07","modified_gmt":"2021-05-02T01:32:07","slug":"xingrans-status-report-for-5-1-2021","status":"publish","type":"post","link":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/2021\/05\/01\/xingrans-status-report-for-5-1-2021\/","title":{"rendered":"Xingran\u2019s Status Report for 5\/1\/2021"},"content":{"rendered":"

This week my main task is debugging the audio signal quality.<\/p>\n

I have plotted the audio data sampled by the ADC, with no audio or sine wave audio. It turns out that we have a larger than acceptable noise which is constantly affecting the signal.<\/p>\n

\"\"\"\"\u00a0<\/span><\/p>\n

(y axis: ADC readings, 3.3V corresponds to 32767 (uint16 max))<\/p>\n

With some probing in the lab and with the new pre-amp, Adam confirms in the lab that the signal before the ADC has only a little noise introduced. So I focus on checking sampling errors or Bluetooth transmission errors in the digital domain, since that is where most of the noise is introduced. I am setting up a program to stream the ADC sampled audio onto the I2S bus on my stm32 discovery board, so that I can directly hear it through the on board DAC; in this way I can isolate whether the ADC or the BT module is faulting. This is what I will report on next week.<\/em><\/p>\n

I have also updated the software diagram, and performed the quantitative tests for ADC sampling, signal latency, and BT range that we will present in our final presentation.<\/p>\n

\"\"<\/p>\n

(Noooo! Most of my time I am exhausted in the sea of 3~4 circuit boards and\u00a0 jumper connections and I feel I am growing succinct\/lazy on status reports :O )<\/p>\n","protected":false},"excerpt":{"rendered":"

This week my main task is debugging the audio signal quality. I have plotted the audio data sampled by the ADC, with no audio or sine wave audio. It turns out that we have a larger than acceptable noise which is constantly affecting the signal. \u00a0 (y axis: ADC readings, 3.3V corresponds to 32767 (uint16 … <\/p>\n

Continue reading “Xingran\u2019s Status Report for 5\/1\/2021”<\/span><\/a><\/p>\n","protected":false},"author":434,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[2],"_links":{"self":[{"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/posts\/180"}],"collection":[{"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/users\/434"}],"replies":[{"embeddable":true,"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/comments?post=180"}],"version-history":[{"count":1,"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/posts\/180\/revisions"}],"predecessor-version":[{"id":189,"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/posts\/180\/revisions\/189"}],"wp:attachment":[{"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/media?parent=180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/categories?post=180"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/course.ece.cmu.edu\/~ece500\/projects\/s21-teamd0\/wp-json\/wp\/v2\/tags?post=180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}