|
US4956868A
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Magnetically shielded electromagnetic acoustic transducer
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Hearing aid transducer
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Microphone with frequency pre-emphasis channel plate
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Microphone with frequency pre-emphasis
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Passive ear protector
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Cleanable in-the-ear electroacoustic transducer
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Acoustic transducer with improved electrode spacing
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|
CA1223050A
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Equalizer networks and methods of developing scaling coefficients therefor
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|
CA1199080A
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Audio loudness control system
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|
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Miniature acoustical transducer with filter/regulator power supply circuit
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Audio loudness control system
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Microphone with stepped response
|
|
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Acoustic transducer of improved construction
|
|
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Priority mixer control
|
|
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Acoustic transducer with improved electret assembly
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|
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Transducer coupling system
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|
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Audio system with enhanced spatial effect
|
|
GB1495292A
|
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Acoustic transmission systems for electro-acoustic transducers
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US3930560A
|
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Damping element
|
|
GB1438860A
|
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Delta modulator
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