On Aug 19, 4:39 pm, Jerry Avins
ieee.org> wrote:
> Radium wrote:
>> In the case of digital video, we could treat each individual sample
>> point location in the sampling grid (each pixel position in a frame)
>> the same way as if it was a sample from an individual (mono) audio
>> signal that continues on the same position in the next frame. For
>> example, a 640?480 pixel video stream shot at 30 fps would be treated
>> mathematically as if it consisted of 307200 parallel, individual mono
>> audio streams [channels] at a 30 Hz sample rate. Where does bit-
>> resolution enter the equation?
> It might actually make sense to look at it that way in some situations,
> but I'll bet you can't think of one.
This would be a start if I want to decrease the frequency of a video
signal without decreasing the playback speed.
The application here is to change the frequency of the video signal
without altering the frame-rate, sample-rate, or tempo of the video
signal.
This is like changing the pitch of audio on playback without modifying
the sample-rate or playback speed.
Adobe Audition provides this affect.
Using this software, you can also change the tempo of a song without
affecting the pitch.
> As for bit resolution, what does
> that term mean to you? I think it means the number of bits used to
> represent each sample, whatever the situation.
Same here. In audio, a greater bit-resolution provides more levels of
loudness that a smaller bit-resolution. In video, what does a greater
bit-resolution provide that a smaller bit-resolution doesn't? More
levels of light intensity? More colors? I am just guessing.
>> Digital linear PCM audio has the following components:
>> 3. Bit-resolution [16-bit for CD audio]
> So you do know what the term means.
Yes. I know what it means. However, I don't know what its video-
equivalent is?
>> II. Digital vs. Analog
>
>> Sample-rate is a digital entity. In a digital audio device, the sample-
>> rate must be at least 2x the highest intended frequency of the digital
>> audio signal. What is the analog-equivalent of sample-rate? In an
>> analog audio device, does this equivalent need to be at least 2x the
>> highest intended frequency of the analog audio signal? If not, then
>> what is the minimum frequency that the analog-equivalent-of-sample-
>> rate must be in relation to the analog audio signal?
> There are no samples in an analog system, so there is no sample rate.
Okay. Then what is the analog-equivalent of a "sample"?
The analog-equivalent of bit-resolution = dynamic range
The analog-equivalent of sample rate = ?
Thanks for the link
