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RT5508 数据表(PDF) 18 Page - Richtek Technology Corporation |
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RT5508 数据表(HTML) 18 Page - Richtek Technology Corporation |
18 / 57 page RT5508 Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation www.richtek.com DS5508-01 March 2017 18 Sampling Rate Delay The SRC introduces delay with respect to different I2S sampling rates, which is shown in Table 2. Table. 2Sampling Rate Conversion Delay I2S sampling rate Delay Absolute Delay fs = 8k 29/fs 3.6ms fs = 11.025k 28/fs 2.5ms fs = 12k 28/fs 2.3ms fs = 16k 29/fs 1.8ms fs = 22.05k 26/fs 1.2ms fs = 24k 26/fs 1.1ms fs = 32k 29/fs 0.9ms fs = 44.1k 0/fs 0ms fs = 48k 0/fs 0ms The I2S signals at different sampling rate are all up-sampled to 48ksps or 44.1ksps before DSP processing or pass-through to PWM + class D amplifier. The data path delay is dominated by the group delay of SRC, the look-ahead delay of gain limiter, and some minor delay in SPK protection algorithm (<0.5ms). For example: the worst case loopback delay of I2S may be about 16ms (3.6*2+8+0.5) if fs = 8k and look-ahead delay = 8ms. Signal Processing Path After sampling rate conversion, the signal is processed by two sub-functions as shown in Figure 13. The pre-filters are some audio effect related functions, and the SPK protection block is the core function for speaker protection. 10 BiQ HPF LPF BWE D I sense Speaker SI DCR impedance Delay Gain Limit Excur. Calc. ALC Ampl. Control Excur. Control pilot DCR. Control MBDRC (Audio Effect) DSP SPK Protection Volume / Ramp ↑↓ From SRC 1 SPKE Clip VBAT sense S_clip Figure 13. Signal Processing Path |
类似零件编号 - RT5508 |
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类似说明 - RT5508 |
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