Express DSP compliant C55x DTMF detector software is proposed in two versions: one with a 5 ms Frame
size and one with a 10 ms Frame size. The versions are quite similar in behavior. The version with a 10 ms
Frame size is faster, but the overall quality is higher in the 5 ms version, due to lower time granularity. DTMF算法for TI DSP 54X/55X
This function returns NULL when called for an MDI main Frame window (CMDIFrameWnd). In an MDI application, the MDI main Frame window does not have a view associated with it. Instead, each individual child window (CMDIChildWnd) has one or more associated views. The active view in an MDI application can be obtained by first finding the active MDI child window and then finding the active view for that child window.
