Digital and analog directional microphone

一种定向麦克风包括：具有加长管的猎枪式麦克风(16)，其能在高于预定频率的频率上控制定向麦克风的方向性；在猎枪式麦克风(16)上相间排列的至少四个基准麦克风(20，22，24，26)。电连接于猎枪式和基准麦克风上的信号处理器(50)从基准麦克风的部分信号中产生具有低于预定频率的频率的干扰消除信号(自96)。信号处理器(50)组合(98)消除信号和来自猎枪式麦克风(16)的信号以产生输出信号(100)，其中来自管纵轴方向的定向麦克风前方的信号被增强，而来自管纵轴方向上定向麦克风前方以外的方向上的信号被抑制。 A directional microphone is disclosed. The shotgun microphone has an elongated tube which is designed to control directivity at frequencies above a predetermined frequency and at least four reference microphones spatially arranged about said shotgun microphone. A signal processor, which is electrically connected to said shotgun and reference microphones, generates interference cancelling signals from the portions of the signals from the reference microphones which have frequencies generally below the predetermined frequency. The signal processor combines the cancelling signals with the signal from the shotgun microphone to generate an output signal in which signals originating from in front of the directional microphone in a direction along the longitudinal axis of said tube are enhanced and signals originating from locations other than in front of the directional microphone in a direction along the longitudinal axis of said tube are suppressed.