66 synthesize the sound piano 67- f0: 130.5 fundamental frequency /Hz 68 69 70 7
ID: 3599934 • Letter: 6
Question
66 synthesize the sound piano 67- f0: 130.5 fundamental frequency /Hz 68 69 70 71-T2 72-N 20: 73- fs-s-44100: % sampling frequency in Hz 74-len- ts s: length (Ys) 75- deltaf-fs/len; % distance between two samples 76- n_peak-eo/delta-f+1; % number of samples between to peaks 2.2.1 Synthesize a signal that will define frequency resolution (all components same phase) % duration in number of components - - create a vector Ys (synthesized) containing complex spectrum of a sum of % sinusoids 78 79 80-zeros (len, 1) si- y_pos-zeros ( tix( 82 83 04 85 06 87- -end 89 90 91 92 93 94 95 half (freq) of ) +1,1); % here we divide the IrOUIST freq by the spectral resolution and see if (ts-s/2)/delta-f positive the vector we have a sample there (fix) . for loop to fill in the peaks for the positive frequencies % 0 peaks on the positiv frequencies amplitude of peaks check if vector is even or odd. If it is even, it will hiot the NYOUIST frequency, then the spectrum is mirrored around this -and hence it is NOT contained in the negative frequencies. If it is odd, the NYOUIST frequeney will NOT be hit, hence you have a sample symetrically around the NYQUIST frequency and need to take all but the fizst sample of the positive frequencies (the DC) with you:Explanation / Answer
The result of this is that the Asynchronous counter suffers from what is known as “Propagation Delay” in which the timing signal is delayed a fraction through each flip-flop.
However, with the Synchronous Counter, the external clock signal is connected to the clock input of EVERY individual flip-flop within the counter so that all of the flip-flops are clocked together simultaneously (in parallel) at the same time giving a fixed time relationship. In other words, changes in the output occur in “synchronisation” with the clock signal.
The result of this synchronisation is that all the individual output bits changing state at exactly the same time in response to the common clock signal with no ripple effect and therefore, no propagation delay.
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