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H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
H04R3/00—Circuits for transducers
H04R3/005—Circuits for transducers for combining the signals of two or more microphones
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General Health & Medical Sciences
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Otolaryngology
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Physics & Mathematics
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Engineering & Computer Science
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Acoustics & Sound
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Signal Processing
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Filters And Equalizers
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Circuit For Audible Band Transducer
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Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo
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GB191215915D1912-07-081912-07-08A Method of Enabling Speech-transmitting Instruments comprising Microphones to be Worked when Connected in Parallel.
ExpiredGB191215915A
(en)
Improvements relating to Retransmitting and Reinforcing Telephone Currents on Lines also used for Telegraphic Purposes or otherwise Liable to have Currents of relatively Low Frequency passing over them.