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CS6403 Datasheet(PDF) 9 Page - Cirrus Logic |
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CS6403 Datasheet(HTML) 9 Page - Cirrus Logic |
9 / 54 page OVERVIEW In hands-free speakerphones, the signal from the far end may echo about the near-end environ- ment and then be received at the near-end microphone. When heard at the far end, this echo signal can be very annoying, particularly if the signal is delayed by transmission or signal- processing delays. Voice switching is a particularly simple tech- nique for eliminating this echo, but since it imposes half-duplex communication, it seriously compromises conversation quality. Echo cancellation can provide high-quality, full- duplex communication, but typically must be implemented using expensive digital signal-proc- essing hardware. Echo Cancellation in the CS6403 The CS6403 provides high-quality echo cancel- lation at low cost. This breakthrough in cost/performance is made possible on the CS6403 by custom, application-optimized proc- essing blocks, which are integrated on a single die, as shown in Figure 2. One of these processing blocks is the AFP (Adaptive Filter Processor). This block imple- me nts a 5 1 2 -ta p A F IR ( Ad aptive Finite Impulse-Response) filter which is updated using an enhanced least-mean squared (LMS) algo- rithm. At a sampling rate of 8 kHz, it can cancel up to 64 ms of echo. By default, 10 ms of the available 64 ms are allocated to a network can- celler (NEC), and the remaining 54 ms are allocated to an acoustic echo canceller (AEC). RESET CLKIN CLKOUT DVDD0 PLL/Oscillator SSI CPU AFP CODEC SCLK SFRAME SMASTER SDO SDI RESERVED0 DGND0 RESERVED1 GPIN3 CONFIG GPIN0 GPIN1 GPIN2 SCLK_RATE0 SCLK_RATE1 DVDD1 DGND1 PVDD PGND0 PGND1 AVDD SPKROUTP SPKROUTN VREF VCM MICIN AGND0 AGND1 GPOUT0 GPOUT1 RESERVED2 RESERVED3 RESERVED4 SSYNC SYNCOUT UALAW NC RESERVED5 RESERVED6 CLK_SEL Figure 2. CS6403 Internal Block Diagram CS6403 DS192PP6 9 |
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