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BD3870FS 데이터시트(PDF) 11 Page - Rohm |
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BD3870FS 데이터시트(HTML) 11 Page - Rohm |
11 / 16 page Technical Note 11/15 www.rohm.com 2010.10 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. BD3870FS,BD3871FS,BD3872FS,BD3873FS 1)Sound generation using Loud Speaker Equalizer (BD3872FS) Using external components, one of the following two functions can be established; one having an effect to localize the vocal forward and enhance it (Loud Speaker Equalizer) and the other having an effect to clarify the vocal quality and improve the Articulation Index (Cinema Surround). Those characteristic values can be adjusted by choosing the external components with desirable constants. Details of above two functions are described below: ◎ Cinema Surround Constructing the external components as shown below allows the vocals to be moved forward and enhanced. Surround effect with enhanced vocal is achieved by turning on the built-in surround simultaneously. Merging this effect, while playing movies on a DVD player, will make vocal listening clearer and surround effect more impactful. Fig.10 ◎ Loud Speaker Equalizer (SEQ) BOOM BOX and Micro-sound systems are often restricted to using small-diameter speakers because of location space. These speakers, where the vocal range are attenuated, may give an impression of having a muffled vocal sound with respect to its audibility. Using the Loud Speaker Equalizer, the vocal quality which degrades in small-diameter speakers, can be improved and the Articulation Index is also increased. Fig.11 ・ C1 can be selected to determine the frequency where the phase should be inverted. C1 Frequency where the phase is inverted Larger value Set to the lower frequency side Smaller value Set to the higher frequency side ・ C2 can be selected to determine the HPF cut-off frequency fc. The SEQ gain remains constant. 1 fc = (Hz) 2 RC (Where R is a built-in resistance of 10kΩ) Fig.12 32 Loud speaker equalizer1 Loud speaker equalizer2 31 30 29 HPF C2 SOUT (29. 31pin) Phase Shifter C1 SEQ (30, 32pin) IN OUT FREQUENCY Fc G=5dB (Constant) 3dB |
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