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  1. #1

    How Ribbon Microphones Work?

    Just read your section on "Who Microphones Work". EXCELLENT!!

    Although, you did explain the Moving Coil Dynamic and Condensor microphones, you not did talk about Dynamic Ribbon mics.

    Thanks.

  2. #2
    Ribbon mics work just like dynamic mics, but instead of a coil of wire moving in a magnetic field, you have a single conductor. It's flat and very thin, like Christmas tree tinsel, and air vibrations move it directly. In most cases the ribbon is stretched vertically with the poles of the magnet along either edge. Its low moving mass and uncomplicated construction tend to result in a frequency response that is relatively free of resonances and other problems.

    The natural pickup pattern of a ribbon mic is bidirectional, or figure-8. The sides of the mic represent nulls which can reject sound by a ratio of as much as 50dB compared to front- or back-originating sounds. The manufacturer can modify this pattern by shading or partially blocking pickup to the front or rear, but this is difficult to do without affecting the ribbon mic's naturally flat frequency response.

    Ribbon mics exhibit extreme proximity effect (bass boost when you get close). Male announcers like them because of their "warm" sound; in reality, you can get the same effect from any mic by turning the bass control up.

  3. #3
    A ceramic microphone element works the same way. The Rochelle salt is not very strong and crumbles easily. If you drop a mic or let it freeze or it gets too hot the element breaks in half and is useless. Stronger materials with piezoelectric effects similar or even stronger than then Rochelle salts have been discovered over the years.

  4. #4
    A nearly constant charge is maintained on the capacitor. As the capacitance changes, the charge across the capacitor does change very slightly, but at audible frequencies it is sensibly constant. The capacitance of the capsule and the value of the bias resistor form a filter that is high-pass for the audio signal, and low-pass for the bias voltage

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