JaZZ
Headphoneus Supremus
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I'm not sure if I get you right this time. Is this what you're trying to say? In a case where the sampling rate e.g. changes by only a few numbers, and your reference point is let's say the start of a short tone burst, then after the same defined number of samples the given waveform will cause the concerned sample to be positioned on a different place within the wave, e.g. on the edge instead on top, with as a consequence a different amplitude value. So of course you're right. Nevertheless, Joe's example with its 192/48 kHz alternatives doesn't really lead to this scenario, so I'm not sure if it's this what you mean.
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I'm not happy with your wording. A step is the minimum possible amplitude-value change from my perspective -- insofar your wording isn't clear. With PCM, at every moment you have the whole bandwidth of the given bitrate at your disposal, but of course the incoming signal shape dictates what value is recorded by the ADC at a defined moment. Now in the case of PCM you have a very fine grid, be it 16 or 24 bit -- at least compared to the coarse 7.17-bit/141-step grid with DSD -- when it comes to catch the exact amplitude values for a signal meant to represent a 20-kHz tone.
Originally posted by theaudiohobby ...This amplitude value will change, if the sampling frequency changes. |
I'm not sure if I get you right this time. Is this what you're trying to say? In a case where the sampling rate e.g. changes by only a few numbers, and your reference point is let's say the start of a short tone burst, then after the same defined number of samples the given waveform will cause the concerned sample to be positioned on a different place within the wave, e.g. on the edge instead on top, with as a consequence a different amplitude value. So of course you're right. Nevertheless, Joe's example with its 192/48 kHz alternatives doesn't really lead to this scenario, so I'm not sure if it's this what you mean.
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The values you keep quoting are simply the total number permutations of the n-bit word e.g. a 16-bit word has 65536 possible permutations and a 24-bit word has 16,777,216 permutations. And these permutations correspond to the smallest to the largest value of the given n-bit word, which I think is what you are referring to as steps. |
I'm not happy with your wording. A step is the minimum possible amplitude-value change from my perspective -- insofar your wording isn't clear. With PCM, at every moment you have the whole bandwidth of the given bitrate at your disposal, but of course the incoming signal shape dictates what value is recorded by the ADC at a defined moment. Now in the case of PCM you have a very fine grid, be it 16 or 24 bit -- at least compared to the coarse 7.17-bit/141-step grid with DSD -- when it comes to catch the exact amplitude values for a signal meant to represent a 20-kHz tone.