Handbook for Sound Engineers

752 Chapter 21 is the time an input is kept activated (200 ms) compared to the decision time taken to activate an input (10 ms). ...

Preamplifiers and Mixers 753 Figure 21-22. Block diagram of the Lectronics AM1612 mixer. +15V Mic in + Mic in Mic gnd + Mic prea ...

754 Chapter 21 Peavey, and Rane. To date, the operational concepts used in digital automatic microphone mixers have not varied f ...

Preamplifiers and Mixers 755 employ very subjective descriptions that have to be inter- preted into quantitative engineering ter ...

756 Chapter 21 table with the room in normal unoccupied operation and at least 2 feet from any surface. Methods for achieving lo ...

Preamplifiers and Mixers 757 speech is originating at the moment. Requirements for comfortable listening in the room dictate rev ...

758 Chapter 21 microphone and a loudspeaker with associated amplifi- cation. A hybrid interface between the send and receive lin ...

Preamplifiers and Mixers 759 The conference bridge operates in a similar manner. Good balance in both the bridge and the hybrid ...

760 Chapter 21 and aimed upward. Never place loudspeakers in front of microphones as microphones cannot distinguish between talk ...

Preamplifiers and Mixers 761 channel. Bandpass filtering in the receive channel reduces the possibility of extraneous noise from ...

762 Chapter 21 21.3.7.8 The Present and Future of Teleconferencing Most basic teleconference systems are sophisticated speakerph ...

Preamplifiers and Mixers 763 References C. Motchenbacher and F. Fitchen, Low-Noise Electronic Design, New York: John Wiley & ...

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765 Chapter 22 Attenuators by Glen Ballou 22.1 General.......................................................................... ...

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Attenuators 767 22.1 General Most of the circuits today do not require passive attenu- ators and/or impedance matching devices a ...

768 Chapter 22 22.1.1 Attenuator K Value To simplify the design of complex attenuators, a K value is used in the equation. K is ...

Attenuators 769 22.1.2 Loss The term loss is constantly used in attenuator and pad design. Loss is a decrease in the power, volt ...

770 Chapter 22 impedance to each branch of the circuit. A noninductive resistor is a resistor having little or no self-inductanc ...

Attenuators 771 the dc resistance of the two ends differs, the pad was designed to be operated between unequal impedances. If an ...