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HA12209F Datasheet(PDF) 11 Page - Hitachi Semiconductor |
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HA12209F Datasheet(HTML) 11 Page - Hitachi Semiconductor |
11 / 49 page HA12209F Rev.2, Jun. 1999, page 11 of 49 The sensitivity of Music Sensor Gv f1 = f2 = 25k [Hz] [Hz] 1 2 π · C26 · 100k f1 f2 f Figure 5 Frequency Characteristic of MSIN Occasion of the external component of figure 4, f1 is 159Hz. A standard level of MS input pin 25.9mVrms, therefore, the sensitivity of music sensor (S) can request it, by lower formulas. A = MS Amp Gain B = PB input Gain × (1/2)*1 C = Sensed voltage 20log (A × B) = D [dB] PB input Gain = 21.3 [dB] S = 20log S = 14 – D [dB] [dB] C 25.9 · A · B Note: 1. Case of one-sided channel input. Time Constant of Detection Figure 6(1) generally shows that detection time is in proportion to value of capacitor C10. But, with Attack* 2 and Recovery*3 the detection time differs exceptionally. C10 Function Characteristic of MS (1) Function Characteristic of MS (2) Function Characteristic of MS (3) R12 Recovery Recovery Recovery Attack Attack Attack Input level Detection level Figure 6 Function Characteristics of MS Like the figure 6(2), Recovery time is variably possible by value of resistor R12. But Attack time gets about fixed value. Attack time has dependence by input level. When a large signal is inputted, Attack time is short tendency. Note: 2. Attack : Non-music → Music 3. Recovery : Music → Non-music |
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