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BA3888S Datasheet(PDF) 5 Page - Rohm |
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BA3888S Datasheet(HTML) 5 Page - Rohm |
5 / 8 page 441 Audio ICs BA3888S The input signal is separated into three regions : bass (20Hz to 150Hz), middle (150Hz to 2.4kHz) and treble (2.4kHz to 20kHz). These regions are then joined again with the middle and treble regions phase shifted -180 _ and -360 _ respectively with respect to the bass signal. This phase shift adjusts the delay time characteristic for each band and minimizes the distortion of the rising sec- tion of the audio signal. Amplitude compensation (harmonic compensation) To maintain appropriate auditory balance for the treble region that is made up of harmonic components, a high- speed detector and high-performance VCA circuit are used for amplitude control of the treble component. The amount of compensation is determined from a calcula- tion performed based on the DC level input to the CTL pin, and the DC level detected from the input signal. The internal control signal obtained from this calculation com- pensates the amplitude of the treble component input to the VCA. This amplitude compensation recovers the har- monic component, and improves the reproduction clarity (definition level) of instruments and vocals. Bass boost To maintain good balance with the dynamically changing treble component, it is possible to boost the bass compo- nent. The amount of bass boost can be set in the range 0dB to 9dB by connecting a resistor between pins 16 and 17. When pins 16 and 17 are not connected, the bass boost is 0dB, (Typ.), and when they are shorted, the bass boost is at its maximum value of 9dB. Noise gate A high-cut filter is provided to continuously vary the amount of attenuation depending on the input level, and reduce the hiss from tape media that is audible at low vol- ume or on blank sections of tape. This means, that at nor- mal levels, the attenuation of the high-cut filter is minimal, and almost no audio information is lost. As the level be- comes smaller, the attenuation of the high-cut filter grad- ually increases to cut hiss in a natural sounding way. Mode switch The DC voltage on the CTL pin can be used to switch the IC between processing mode and bypass mode. When processing mode is selected, the audio signal is en- hanced using the compensation circuits described above before being output. When bypass mode is selected, the signal bypasses all of the compensation circuits, and only passes through a buffer amplifier before output. |
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