Go Back   Physics Help Forum > High School and Pre-University Physics Help > Waves and Sound

Waves and Sound Waves and Sound Physics Help Forum

LinkBack Thread Tools Display Modes
Old Oct 23rd 2014, 12:16 AM   #1
Junior Member
Join Date: Oct 2014
Posts: 1
Quantization and Sample Rate

1. What defines a ‘minimum’ sample rate and what (if any) benefit
comes from sampling at higher rates? What happens when we take our samples (pictures, voltage measurements, etc.) at very wide time intervals (low sample rates)? What do we successfully capture? What do we miss? What about shorter time intervals (higher sample rates)?

2. How does bit depth (quantization) affect sound quality and what
determines ‘enough’ bit depth? How much do we need to measure? What might
be considered a ‘bad’ measurement and what problems might come from it? How would we hear a ‘bad’ measurement? What conditions are needed for a ‘good’ measurement and how ‘good’ is good enough?
kevitalie is offline   Reply With Quote
Old Oct 30th 2014, 04:08 AM   #2
Senior Member
MBW's Avatar
Join Date: Apr 2008
Location: Bedford, England
Posts: 668
The basic idea is how many discrete points are required before we can't distinguish discrete points any more and it looks (or sounds) continuous.

The basic limit of human hearing is generally quoted as 20Khz (20,000 cycles per second).
To capture this you need (at least) twice as many samples per second (so you get at least 2 points per cycle)

This is the basic theory for pure sinusoidal sound waves.
More complicated wave shapes can be made up from superimposing lots and lots of sine waves.
While it is true that the standard ear can only distiguish upto 20Khz as a pure sine wave, there is some evidence that we can distiguish the change in waveform shape due to the overtones from higher frequencies.
This is (one reason) why some audiophiles still prefer the anolog vinyl records to digital CDs.

Have a look at this wikipedea page:
MBW is offline   Reply With Quote

  Physics Help Forum > High School and Pre-University Physics Help > Waves and Sound

bi-depth, bit, quantization, quantize, rate, sample, sample rate

Thread Tools
Display Modes

Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
a sample problem panda Kinematics and Dynamics 6 Feb 1st 2014 04:37 AM
Activity of sample after time arze Nuclear and Particle Physics 1 Aug 31st 2010 12:11 AM
Help solving a sample final? (will pay $) BloodBaneZXY Electricity and Magnetism 3 Feb 14th 2010 02:50 PM
2 Questions from Sample Midterm, Help! Cutcutler Kinematics and Dynamics 9 Oct 20th 2009 06:00 PM
Find 'Mean Square Quantization Error'.... jeeee Waves and Sound 0 Jun 30th 2009 06:29 AM

Facebook Twitter Google+ RSS Feed