{"id":371249,"date":"2017-03-15T18:08:35","date_gmt":"2017-03-16T01:08:35","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/?post_type=msr-research-item&p=371249"},"modified":"2019-10-30T21:34:29","modified_gmt":"2019-10-31T04:34:29","slug":"clock-drift-estimation-compensation-asynchronous-impulse-response-measurements","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/clock-drift-estimation-compensation-asynchronous-impulse-response-measurements\/","title":{"rendered":"Clock drift estimation and compensation for asynchronous impulse response measurements"},"content":{"rendered":"

The impulse response (IR) of an acoustic environment or audio device can be measured by recording its response to a known test signal. Ideally, the same digital clock should be used for playback and recording to ensure synchronous digital-to-analog and analog-to-digital conversion. When measuring the acoustic performance of a hardware device, be it for audio input to a device microphone or audio output from a device speaker, it is often difficult to access the device\u2019s audio signal path electronically. Therefore, the device-undertest (DUT) has to act either as a playback or recording device for the IR measurement. However, it may be impossible to synchronise the internal clock of the DUT with the reference clock of the measurement system. As a result, the recorded DUT response may be subject to unknown clock drift which may lead to undesired artefacts in the measured IR. Here, a method is proposed for estimating the drift between a playback and recording clock directly from the recorded response to obtain a drift-compensated IR. Experimental results from IR measurements of a DUT subject to clock drift indicate that the proposed method successfully estimates the drift rate and yields an accurate IR estimate in magnitude and phase.<\/p>\n

Matlab sample code available at github.com\/microsoft\/Asynchronous_impulse_response_measurement (opens in new tab)<\/span><\/a><\/p>\n

\"Clock<\/p>\n","protected":false},"excerpt":{"rendered":"

The impulse response (IR) of an acoustic environment or audio device can be measured by recording its response to a known test signal. Ideally, the same digital clock should be used for playback and recording to ensure synchronous digital-to-analog and analog-to-digital conversion. When measuring the acoustic performance of a hardware device, be it for audio […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"user_nicename","value":"Hannes Gamper","user_id":"31943"}],"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"Proc. 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