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BA3884F Datasheet(PDF) 5 Page - Rohm |
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BA3884F Datasheet(HTML) 5 Page - Rohm |
5 / 9 page 432 Audio ICs BA3884F / BA3884S 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 CTL1 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 is determined by the DC level applied to CTL2. 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. External components The frequency characteristic in processing mode with maximum definition level and maximum bass boost is given below. As indicated in the diagram, capacitors C1 and C2 deter- mine the treble component cutoff frequency. By varying the values of these components, the frequency charac- teristic can be changed as indicated by the dotted line in the diagram. This varies the balance of the harmonic component, and is an important factor in determining the tone quality. C1 : External capacitor connected between the VCA and MIX pins (0.068 µF in the application circuit). C2 : External capacitor connected between the OUT and MIX pins (470pF in the application circuit). |
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