Audio system for vehicular application

DETAILED DESCRIPTION Systems and methods in accordance with the invention enable virtually infinite segmentation and modification of the audio frequency spectrum by transfer of signals from a source in both parallel and serial processing chains.
Individual electronic crossover modules are arranged with standard but widely adjustable submodules, each of which encompasses specific overlapping acoustical bands, together with a separate low frequency section which may function in common with different sources.
By serial processing of signals, frequency band cutoffs may be chosen to achieve higher order selective characteristics.
Segmentation of the acoustic band with virtually infinite variety is achieved by the use of multiple submodules, each having adjustable low pass, bandpass and high pass filters.
The upper range of cutoff for the low pass filter and the low end of the bandpass filter are approximately the same, as are the lowest limit of the upper end of the bandpass and the lowest value selectable for the high pass filter.
In addition the filter channels also include means for shifting the cutoff points by a multiplying factor to a substantially higher level.
An input switching channel enables separation or combination of signals from different sources, while a mixing input/output provides both external interconnection and transfer of signals to a very low frequency (subwoofer) channel, since lowest frequency signals are not strongly stereophonic in character.
By coupling the outputs of one module, such as the pass band, to the input of another, a high degree of frequency segmentation is achieved Where a higher cutoff attenuation rate is desirable, cutoff regions may be set at like levels to increase a standard cutoff (e.
g.
12db) to a higher figure (such as 24db or 36db).
These cutoffs, it must be emphasized, need not be at fixed points.
Further versatility in signal modification is achieved in each group of submodules by incorporating a parametric equalizer which can independently adjust frequency, amplitude and figure of merit (Q}to compensate for input signal characteristics