If you find this happening frequently, change the DIP switches on the EARS to reduce the gain. In a couple of cases, like say slamming a car door with the EARS inside, the recording had some clipping. Then: play testfile.wavĭuring our various recording tests, we found that the default 18 dB analog gain of the EARS is a good general compromise. To play back the file, ensure that your system's default output device is set to the device that you want to play audio from. Or to record for 10 minutes: rec testfile.wav trim 0 10:00 Or, to record for a set period of time, use the trim option – for example, to record for 30 seconds: rec testfile.wav trim 0 30 You can change "testfile.wav" to whatever filename you like. ![]() To use sox to record audio from EARS, ensure that your system's default input device is set to the EARS and that it is set to a sample rate of 48 kHz. We used the command-line tool sox because it's easy to do the necessary post-processing on the recording. Recording from the EARS is simply a matter of using any audio recording software that you have. Therefore, some post-processing on the recording will be needed to remove its effects. However, if using the EARS as a microphone, this resonance will alter the recording enough to be audible. We wondered, however, if it would be similar enough to give a convincing sound field – hence our experiments.Īnother issue with using the EARS for recording is the resonance in the artificial "canal." During headphone measurements this is removed by the calibration files that we provide. We therefore wouldn't expect to see the exact same variation in response as a real head as the sound source moves around. While the EARS doesn't have a full "head" like the dummy heads in the articles linked above, it does have the simulated pinnae. ![]() These Wikipedia articles provide more information: This recording is then played back on headphones to provide a realistic soundfield. The frequency response and the time delay between the two microphones varies with the location of the sound source. Our results are below if you'd like to try this for yourself!īinaural recording uses two microphones positioned on a "dummy head" to simulate the effect of your head and ear (the external part, known as the pinna). We decided to investigate a little and do some experiments. While the miniDSP EARS was designed for headphone measurement, a number of customers have asked us if it can be used for binaural recording.
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