Quotations room picked up the broadcast vocal language class program , often using a dynamic microphone with a condenser microphone types. Dynamic microphone rugged , high sensitivity, good point , pick up the sound clear, pure, gentle , frequency response at 40Hz ~ 16kHz range ; condenser microphone good sound quality, high sensitivity, the sound picked up plump , bright, subtle, sophisticated , frequency response 20Hz-18kHz human ear audible band . Condenser Polar characteristics, such as (Voicemic) features a total of five points to choose from: omnidirectional , semi-circular , heart-shaped , super- cardioid and figure eight , capable of a variety of recording conditions. Radio show host in the form of language class recordings to clarity as the main indicators used mostly heart-shaped , super- cardioid dynamic microphone or a capacitor microphone. Cardioid unidirectional pickup feature is only picking up front sound. When vocal microphone central axis aligned with the mouth angle "0 °", the output of the microphone frequency response best speaker in his speech if the face, neck and swing around , shaking up and down , mouth off vocal microphone central axis , sound energy will shift or attenuation. 8-shaped directional microphone is bi- directional characteristics , front and back of the microphone can pick up the sound of the closing , interview programs available for pickup .