An A Level Physics revision video covering Digital Sampling, Signal Spectra and Bandwidth
Пікірлер: 48
@johnrussellhilario3166 жыл бұрын
The carrier wave always has the higher frequency than the band wave. Please correct this grave mistake. Thanks.
@Rayhuntter10 жыл бұрын
Great explanation. Only people, like you, that perfectly understand the matter can give so clear, precise explanation. I have a question: how do you measure Vn(the range of the noise)?
@dijonstreak6 жыл бұрын
Thee BESt demo / video on subject matter online !! GREAT JOB !!
@bosteador10 жыл бұрын
This taught me more than my Signals and DSP classes!
@Sperzel11 жыл бұрын
Do you know everything there is to know about physiics? These vids are amazing! Thanks for sharing your knowledge with us in this wonderful way!
@aymenjahangir97846 жыл бұрын
Why does 65 536 gradations need 16 bits for each number to be represented?
@turquoisecat7616 жыл бұрын
It's to do with the binary nature of digital signals. In other words, 2 raised by the bit depth, so 16-bit gives 2 multiplied by itself 16 times (2x2x2x2x2.....) which equals 65,536. Similarly, 8-bit is 2 multiplied by itself 8 times which is 256 etc. Increasing bit depth essentially improves the precision of any signal which has been quantized..
@thomasswayngim60267 жыл бұрын
Sir, you have always been kind enough to give full explanations, so I ask of you, do you have a video on converting the digital back to analog. My confusion lies at the digitization of the signal. I would imagine a micro phone, and a speaker need to be arranged in an inverse arrangement to reproduce sound, but whatever the order, that implies to me a magnet and coil produced the signal, and therefore a magnet and coil are needed to interpret the signal, but this video does little to explain super imposing numbers to a wave. (my best approximation is to assign numbers to waves of varying degree within a bandwidth). The computer itself stores the information, which is nice if one wanted to look at its graph. My next approximation is that the receiving computer needs its own ac producing generator to reproduce the analog (could it be so responsive?), or perhaps some system of resisters and diodes. SO how is the image on the oscilloscope in anyway compatible with an alternating electrical current. It seems simple enough to allocate numbers to a picture, but not the same right to sound production. Thank you for whatever ease your answer may come in. If it may ever come years since it's post. Your videos are wonderful. I learn physics in my own time not on college time at this moment. Dr. Walter Lewin's classes are nice, but cannot bring me up to his speed. He'll throw around squared numbers like it's nobodies business. Thank you so much for your time spent on these videos, even if they didn't bring millions of dollars, or even thousands. Thank you. thank you. thank you "bow my head" "bow my head" thank you thank you thank you.
@danhyde75016 жыл бұрын
i fucking hate that i only just found your videos now. my physics teachers are awful, 1 week from the exam and some of this stuff is fully new to me. good bye predicted grade A
@DrPhysicsA11 жыл бұрын
Oh, that it just me guessing the values (and doing so very badly). As you say, the average values would be higher. I was just trying to establish the general principle. Hope it doesn't confuse too much.
@pianoman4242111 жыл бұрын
Excellent video. Most entertaining channel on youtube. Thank you
@mojoma10 жыл бұрын
Very good video, thank-you! In the beginning when you are illustrating the longitudinal wave you say the waves are "rarefied then spread out", which is incorrect. The waves are compressed then spread out(rarefied).
@alevelsdemystified34106 жыл бұрын
How does increasing the number of bits reduce ,the step height in digital sampling?
@DiederikCA11 жыл бұрын
I also dont understand how it translates to Kib/s. The digital resolution is 16 bit, so therefore multiplying by sampling rate (44056hz) should give the bits/s. However: 16*44056 = 704896 multiply by 2 since its stereo =1409792bit/s divide it by 1024 and should have Kib/s; 1409792/1024 = 1376Kib/s However, the actual audio quality of CDs is 1200Kib/s, what am I doing wrong?
@blub23232411 жыл бұрын
In 10:00: Why are ther 3-1-1 for the last three columns? I mean in the first columns the value is much like the max/min, but for the last three it is more like the average value. I would have considered 5 for the 6th column. Can you explain that please?
@godwintheophilus570110 жыл бұрын
OMG u are awesome..!!!!! can u upload a video on filters,modulation,encryption,decryption,demodulation and reconstruction??? this would help me a lot...thank you
@godwintheophilus570110 жыл бұрын
and how to convert the digitized signal that some 45611 u told to binary??
@TheSohanandrei11 жыл бұрын
You, my friend, are AWESOME!
@Aproksinov11 жыл бұрын
Love it! Such a great video! Thank you very much.
@tyroneslothdrop915510 жыл бұрын
Is the procedure for digitally restoring film essentially the same?
@DrPhysicsA11 жыл бұрын
Its 2^16 not 16^2. Consider 3 bits. You could get 8 numbers ie 2^3
@johneygd11 жыл бұрын
Just imagine that on one day a computer will be able recognize and saperate all instruments in a mono song in accordance to those sound patterns, even if there're multiple instruments playing atonce, it sounds impossible but the example you showed makes me believe this theory, it would be cool to turn a mono song into karaoke.
@BoutinMathieu10 жыл бұрын
Very nice video, and so useful. Thanks a lot for tha very good job! :D
@mohammedviso22696 жыл бұрын
Great video ...Thanks a lot .....It was really helpful for me
@popandu82978 жыл бұрын
this is so cool!! thank-you!
@cuteharyavani9 жыл бұрын
Best Video to explain these things
@genius27378 жыл бұрын
Can you pls tell how to covert our recorded voice audio affirmations into silent affirmations adding different mind wave frequencies like alpha theta Gama beta etc and make a final silent subliminal audio Also pls tell me any good software which can make this job easy or guide me steps if it can be also done by Audacity or so as I also use Audacity. Thanks with Regards
@maziarghorbani10 жыл бұрын
Great teaching, Thanks
@DiederikCA11 жыл бұрын
How does this work though? How does the digital resolution of 65536 translate to 16 bits? As far as I know, using 0's and 1's 16 times, can create 16ˆ2=256 posibilities, not 65536. Can someone explain?
@yowassup465 жыл бұрын
its 2^16
@canozano9 жыл бұрын
very good video (Y)
@FungSit11 жыл бұрын
Great video! Thanks.
@okavango59377 жыл бұрын
thanks for your video
@amikhimji9 жыл бұрын
Great video thanks
@DanielDaniel-cq1es9 жыл бұрын
Thankyou that's a great video
@ahmedg789310 жыл бұрын
Perfect!
@bIackstreetboy10 жыл бұрын
Thanks for this.
@lisasquad12472 жыл бұрын
👍
@brendawilliams80623 жыл бұрын
This going by 1001600474. Where is the 10016036
@ryan-tabar10 жыл бұрын
2:40 that face
@alexandregm87038 жыл бұрын
Where are the Brazilians?
@h0m3_8 жыл бұрын
In Brazil???
@genius27378 жыл бұрын
Hi
@genius27378 жыл бұрын
Can you pls tell how to covert our recorded voice audio affirmations into silent affirmations adding different mind wave frequencies like alpha theta Gama beta etc and make a final silent subliminal audio Also pls tell me any good software which can make this job easy or guide me steps if it can be also done by Audacity or so as I also use Audacity. Thanks with Regards