How many and what processors are used in a cellphone and a PDA?

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Dear all,

Is one ARM processor enough for a PDA?Or it needs both DSP and ARM?

How many processors are usually used in the current cellphone?DSP or
ARM or both of them?

For a video cellphone, how many and what kinds of processors are
usually required?

I am curious about the computation capability of ARM and DSP
processors.

Thanks,

Adrian

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