quiz 4 - ECEN 487 QUIZ 4 NAME:_ 1. a) You are a DSP...

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ECEN 487 QUIZ 4 NAME:_________________ 1. a) You are a DSP engineer for Motor Roller Wireless Communications Inc. Your assignment is to design the digital portion of the sample rate conversion function to convert sampled audio data from high fidelity CD quality to AM HD radio formats. Consider an audio music file recorded at a sample rate of 44.1 ks/sec. You want to convert it to a sample rate of 15.0 ks/sec so it can be transmitted over an HD radio AM broadcast station. Assume the original audio bandwidth was limited to 20 kHz, and that the target voice bandwidth is 7 kHz. Draw a block diagram of how you would implement the sample rate change efficiently. Specify ideal filter corner frequencies (in discrete-time radians per sample), gains, and up-sample and down-sample rates. M / L = 441/150 = 147 /50 (common factor is 3) L = 50, M = 147 G = L = 50 " c (ideal) = min( # / L , / M ) = /147 = 0.02137 b) (extra question for study:) Specify the passband corner frequency for a practical filter implementation that would include a transition band. Assume that
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quiz 4 - ECEN 487 QUIZ 4 NAME:_ 1. a) You are a DSP...

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