When a microphone is connected to the channel of a multi-channel EMG ampliﬁer, a synchronic voice recording is possible.
This allows a comparison of myoelectric activity with the patient’s sound production. Additionally,the recorded instructions and comments of the examiner can be helpful for the interpretation of the stored data. The upper ﬁlter cut-off frequency of the microphone should be set to half the sampling rate of the system.
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