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BD3873FS Datasheet(PDF) 10 Page - Rohm |
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BD3873FS Datasheet(HTML) 10 Page - Rohm |
10 / 16 page Technical Note 10/15 www.rohm.com 2010.10 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. BD3870FS,BD3871FS,BD3872FS,BD3873FS 2) Treble filter Fig.7 Standard values of R1, R2 (reference) Treble Boost Cut Amount Resistance (kΩ) * Typ. R1 R2 0dB 0 36.28 2dB 7.46 28.82 4dB 13.39 22.89 6dB 18.10 18.18 8dB 21.84 14.44 10dB 24.81 11.47 12dB 27.20 9.08 14dB (BD3872FS only) 29.04 7.24 * The actual boost cut amount may deviate from the standard values in some degree. 3) Matrix surround Fig.9 Matrix surround is constructed as shown above. Gains are defined as follows: In-phase Gain: Gains obtained on OUT1 and OUT2 against IN1 when inputting a signal of the equivalent level and in-phase (L=R) to IN1 and IN2. 1 L L 2 2.14 L 2 4.14 IN2 OUT2 IN1 OUT1 (dB) 0 20log1 Single-phase Gain: Gains obtained on OUT1 and OUT2 against IN1 when inputting a signal to IN1 and AC-grounding IN2 (R=0). 2,07 L L 2 4.14 IN1 OUT1 1.07 L L 2 2.14 IN1 OUT2 (dB) 6.3 20log2.07 (dB) 0.59 1.07 20log Opposite-phase Gain: Gains obtained on OUT1 and OUT2 against IN1 when inputting signals of the equivalent level and opposite-phase (L-R) to IN1 and IN2. fc = (Hz) G (boost) = 20log (dB) G (cut) = 20log (dB) Zc = (Ω) 2πR2C 1 R2+Zc R1+R2+Zc R1+R2+Zc R2+Zc jωc 1 R2 IN OUT C + - R1 + + - ×1/2 ×1/2 + L R IN1 IN2 + - ×2.14 (4.14L/2 - 2.14R/2) OUT1 OUT2 (4.14R/2 - 2.14L/2) + + + 3.14 L L 2 2.14 L 2 4.14 IN2 OUT2 IN1 OUT1 (dB) 10 20log3.14 Fig.8 G f fc G 3dB G 3dB |
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