AES Convention Papers Forum

Sample-Rate Variance across Portable Digital Audio Recorders

Document Thumbnail

In recent years there has been an increase in the use of portable digital recording devices such as, smart phones, tablets, dictaphones, and other portable hand-held recorders for making informal or in-situ recordings. Often it is not possible to connect a clocking signal to these devices as such recordings are affected by the deviations of the actual clocking rate of the device from the expected rate. This variation causes problems in the synchronization of signals from multiple recording devices and can prevent the use of some signal processing algorithms. This paper presents a novel methodology for determining the actual clock rate of digital recording devices based upon optimizing the correlation between a recording and a ground truth signal with varying degrees of temporal stretching. The paper further discusses the effects of sample frequency variation on typical applications. The sampling rates of a range of commonly used mobile audio recording devices was found to deviate from the nominal 48 kHz, with a standard deviation of 0.8172 Hz. The standard deviation of sampling rates for a single device type, used for long term logging of bio-acoustic signals, was found to be 0.1983 Hz (at a sampling rate of 48 kHz).

AES Convention: Paper Number:
Publication Date:

Click to purchase paper as a non-member or you can login as an AES member to see more options.

No AES members have commented on this paper yet.

Subscribe to this discussion

RSS Feed To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.

Start a discussion!

If you would like to start a discussion about this paper and are an AES member then you can login here:

If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.

AES - Audio Engineering Society