Abstract: A DSP-based vehicle equalization design system has been described, which allows the audio engineer to quickly and efficiently design an equalizer from an easy-to-use Graphic User Interface (GUI) computer interface. Vehicle equalizations, with high precision and parameter variability can be developed in a short period of time. The system and method of design provide DSP filter coefficients for use as-is in actual DSP-based production vehicle equalization hardware.

Abstract: A face mask for use in cold weather to supply warm air for inhalation by normal breathing to persons having respiratory and heart ailments to avoid the discomfort, pain and limited mobility caused by breathing cold air and to healthy people engaged in strenuous cold weather activities. The face mask has inlet and outlet check valves and a cold air intake chamber with an electric heater element therein which heats the cold air to supply warm air for inhalation. The heater element is preferably powered by a portable battery pack and controlled by electronic circuitry to maintain the heated air in a predetermined temperature range.