Abstract: Disclosed is a system and method for providing power load management in a communication system while limiting cost and space requirements.

Abstract: A loudspeaker system having the ability to uniformly direct high-frequency as well as low-frequency sound hemispherically is described. The acoustical centers of a low-frequency and a high-frequency driver are aligned in space to provide a common source of sound to be directed through a common sound-guiding structure. The high-frequency sound is guided by the formation of an acoustical horn between the spherical mounting structure of the low-frequency driver and the reflector generally employed in reflecting and diffracting low-frequency sounds. One side of the acoustical horn has an acoustic path length smaller than the other, forcing sound to further diffract upon passage from the horn.

Abstract: A microphone which uses noise-adaptive automatic output level control in speech recording. An input amplifier cooperates with a voltage doubler to form an automatic gain control. A diode and capacitor circuit provides for envelope detection of the signal which is then differentiated, amplified and detected to result in a DC control signal. This control signal is applied to an output amplifier which functions as a three pole Chebyshev filter in which a reduction of gain dampens one pole of the filter causing the response to drop off, so that the signal appearing at the output of the microphone has a substantially high speech-to-noise ratio. The output signal appears at a constant level where it may then be acted upon by the automatic gain control of an associated tape recorder connected to the microphone.