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BA3884F Datasheet(PDF) 4 Page - Rohm |
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BA3884F Datasheet(HTML) 4 Page - Rohm |
4 / 9 page 431 Audio ICs BA3884F / BA3884S FCircuit operation The BA3884F / S high-definition sound processor sys- tem IC treats the amplifier and speakers as a total audio system, and performs signal processing at the amplifier input stage to accurately reproduce the rise sections of audio signals that determine the characteristics of sound, and ensure that the replayed audio is as close to the origi- nal sound and as natural sounding as possible. Problems relating to playback of sound on audio sys- tems. With naturally-generated sound, high-frequency har- monic components generally occur first, followed by the fundamental frequency components. This also applies to the attack section of the sound that characterizes many musical instruments. It is the amplitude component that gives form to the frequency component and envelope at the rising point of sound, and this expresses the charac- teristics of the sound. Therefore, when replaying audio on audio playback systems, it is extremely important that the rise section of the signal be expressed accurately with respect to the original sound. However, there is inevitable mismatching between the speakers and amplifiers in current audio systems. Solid- state power amplifiers use negative feedback techniques and operate off a fixed voltage supply, but as speakers are a current element, mismatching in the system inevit- ably occurs. In addition, the speaker impedance charac- teristics are strongly influenced by the electrical reac- tance of the voice coil, and the mechanical reactance of the cone assembly. As a result of this, distortion is gener- ated in the rising sections of audio signals, causing phase shift in the reproduced sound. In addition, imped- ance increases in the treble region which reduces the speaker amplitude and reduces the harmonic compo- nent, and as a result there is a tendency to masking of large mid-frequency signal components that follow, and this makes it difficult to reproduce the rising sections of the sound. Operating principle To solve the problems described above, the BA3884F / S performs the audio signal processing described below. Phase shift compensation 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. |
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