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IFMA Preventive Health Management Inc.

Institute for Medical Advancement

New York, USA

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Lavalier Microphones

External microphones are versatile and in many cases better suited for general-purpose use than the smartphones' or tablets' internal devices. Dynamic "Lavalier" microphones offer a frequency response of 50 Hz — 18 kHz, are small in size, fit neatly near the neck of a speaker, and clip freely to almost any piece of clothing. Thus, lavalier microphones provide a hassle-free technique of recording an audio source at high quality.

External Lavalier Microphones

Selecting the Optimal Microphone

Audio signals are recorded with a sampling rate of 48 KHz and at a 16-bit resolution (stereo). The resulting quality depends on the audio equipment in use. In particular, the smartphones' and tablets' internal microphones are some-times insufficient so that dynamic "Lavalier" microphones can be a much better choice as such devices are less sensitive to background noise and pick up sounds more purely.

Sony ECMCS3 is a budget-friendly, omnidirectional electret condenser microphone with a frequency response of 50 Hz — 18 kHz (stereo). A TRRS microphone adapter is required to connect the 3.5 mm stereo jack plug to the smartphones' combo audio port.

Audio-Technica ATR-3350iS is a high-quality omnidirectional condenser microphone that comes with a foam windscreen, a LR44 battery, and a TRRS microphone adapter. It features a frequency response of 50 Hz — 18 kHz.

Rode SmartLav+ is one of the best Lavalier microphones on the market (condenser capsule). It comes with a foam windscreen and features a frequency response of 60 Hz — 18 kHz. It plugs into the smartphone's combo audio port.

External Lavalier Microphones: Attached to Clothing
One can either use the internal microphone of your smartphone, or an external microphone attached with its small clip to a suitable location of your clothing (e.g., Sony ECMCS3, $19). It may be a good idea to test various positions. Subsequently, use the optimal location for best results in repeated recordings.

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