Audio Engineering

642 Chapter 22 the reference sound fi eld pressure is 1 Pa or 94 dB. This rating is more complicated as it involves the micropho ...

Microphone Technology 643 result 94 dBm lower than that of Equation (22.5). If we symbolize this rating by GAIP , then GSAIP ( ...

644 Chapter 22 or decrease the compaction of carbon granules contained in a brass cup so as to decrease or increase the resistan ...

Microphone Technology 645 22.2.3 Moving Coil The moving coil microphone and the ribbon microphone are collectively referred to a ...

646 Chapter 22 22.2.5 Piezoelectric Piezoelectric microphones depend on a structural property possessed by certain dielectric cr ...

Microphone Technology 647 22.3 Nature of Response and Directional Characteristics ............................................. ...

648 Chapter 22 is propagating along the horizontal axis. The diaphragm may be circular as in a capacitor or moving coil micropho ...

Microphone Technology 649 Ft pxt pxt pxtd S x () (,) (,) (,) cos ∂ ∂ ⎧ ⎨ ⎪⎪ ⎩⎪⎪ ⎫ ⎬ ⎪⎪ ⎭⎪⎪ ⎡ ⎣ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ θ  ∂ ∂ ⎡ ⎣ ...

650 Chapter 22 where um is the particle velocity amplitude. The more often encountered case is where the source is nearby to the ...

Microphone Technology 651 Ft() jωρ 0 u rt Sd(, ) cosθ. (22.17) The importance of this result is apparent when Equation (22.17) ...

652 Chapter 22 with the signifi cance that the particle velocity is directly proportional to the acoustic pressure. However, whe ...

Microphone Technology 653 rβγcos ,θ (22.22) where r is the radial distance from the origin and has a maximum value of 1, β and ...

654 Chapter 22 microphones. This is not necessarily the case. As a class, omnidirectional microphones exhibit smoother frequency ...

Microphone Technology 655  L Figure 22.4 : Simplifi ed illustration of a single diaphragm that is sensitive to a combination of ...

656 Chapter 22 whereas for a pressure gradient microphone, it is directly proportional to the gradient of the acoustic pressure. ...

Microphone Technology 657 The three-dimensional directional response of such a microphone is obtained by revolving the direction ...

658 Chapter 22 180 ° 150 ° 120 ° 90 ° 60 ° 30 ° 0 ° 330 ° 300 ° 270 ° 240 ° 210 ° 0.8 0.4 0.6 1.0 (a) Pressure Gradient Pattern ...

Microphone Technology 659 (b) Figure 22.7B : Microphone three-dimensional directional response. (Courtesy of Shure Brothers Inco ...

660 Chapter 22 240 ° 270 ° 270 °^90 ° 90 ° 60 ° 60 ° 30 ° 30 ° 0 ° 330 ° 330 ° 300 ° 300 ° 120 ° 240 ° 210 ° 180 ° 120 ° 150 ° 1 ...

Microphone Technology 661 been added. Frequency space has been made available in both the VHF and UHF frequency bands with UHF u ...