Abstract: A high-frequency enhancing, asymmetric audio throughput apparatus for matching a stereo audio signal to a user's specific hearing impaired audiometric profile. Volume controls and or graphic equalizer circuits may be dedicated to each channel to enable tuning of channel specific audio output levels and frequency response. A monaural/stereo selector switch may be used to select between stereo and monaural audio throughput. A balance control may provide further ease of adjustment for the asymmetrically impaired. An attenuation circuit may attenuate the audio signal if it exceeds a desired signal level, preventing damaging signal levels from reaching the user. The apparatus may be located in a housing wearable by the user. The housing may be integrated into a headphone cord or configured with input and output jacks for placement between a portable stereo audio source and a user's headphones.

Abstract: In a color CRT with an in-line gun and a pin cushion correcting yoke, there is disclosed an eyebrow effect electronoptical distortion correction device comprising two pair of coils, each pair having a coil on each outer electron beam side of the neck in the plane of the beams. The coil pairs are spaced apart along the Z-axis between the gun and the yoke and are driven by a sawtooth current having a bow-tie envelope synchronous with the raster scan to correct the dynamic, antisymmetrical eyebrow effect apparent as a purity defect on the raster.