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STA015 データシート(PDF) 28 Page - STMicroelectronics |
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STA015 データシート(HTML) 28 Page - STMicroelectronics |
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28 / 44 page ![]() BASS_FREQUENCY_LOW Address: 0x79 (121) Software Reset: 0x00 Hardware Reset: 0x00 MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 BF7 BF6 BF5 BF4 BF3 BF2 BF1 BF0 BASS_FREQUENCY_HIGH Address: 0x7A (122) Software Reset: 0x00 Hardware Reset: 0x00 MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 BF15 BF14 BF13 BF12 BF11 BF10 BF9 BF8 The registers BASS_FREQUENCY_HIGH and BASS_FREQUENCY_LOW, logically concate- nated as a 16 bit wide register, are used to select the frequency, in Hz, where the selected fre- quency is -12dB respect to the pass-band. By setting the BASS_FREQUENCY registers, the following rules must be kept: Bass_Freq <= Treble_Freq Bass_Freq > 0 (suggested range: 20 Hz < Bass_Freq < 750 Hz) Example: Bass = 200Hz Treble = 3kHz TFS 15 14 13 12 11 10 9876543210 0000101110111000 BFS 15 14 13 12 11 10 9876543210 0000000011001000 TREBLE_ENHANCE Address: 0x7B (123) Software Reset: 0x00 Hardware Reset: 0x00 MSB LSB b7 b6 b5 b4 b3 b2 b1 b0 TE7 TE6 TE5 TE4 TE3 TE2 TE1 TE0 Signed number (2 complement) This register is used to select the enhancement or attenuation STA015 has to perform on Treble Frequency range at the digital signal. A decrement (increment) of a decimal unit corre- sponds to a step of attenuation (enhancement) of 1.5dB. The allowed Attenuation/Enhan cement range is [-18dB, +18dB]. MSB LSB ENHANCE/ATTENUATION b7 b6 b5 b4 b3 b2 b1 b0 1.5dB step 0 00011 00 +18 0 00010 11 +16.5 0 00010 10 +15 0 00010 01 +13.5 . . 0 000 000 1 +1 0 000 000 0 0 1 111 111 1 -1 . . 1 1 1 1 0 1 1 1 -13.5 1 111 011 0 -15 1 1 1 1 0 1 0 0 -16.5 1 111 010 0 -18 STA015-STA015B-STA015T 28/44 |
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