1 You have just shot some scenes on a DV compliant video camera and now want to edit them in a software package on a computer.

Using appropriate technical terms describe the process you will go through to do this.

Identify and describe the basic principles involved at each stage of the processs; including the main hardware and software components.

2 You have just made some audio recordings with couple of Sure SM58 mics’ in a basic studio set up using a PC to record the tracks.

Describe a basic system for doing this with the given mics and using appropriate technical terms describe the process of turning the analog signal into audio data.

Include all hardware and software requirements and the basic variables involved in digitising analog audio.

3 Calculate the files sizes in mBs for the following audio recordings:-

a

  • Sample rate – 44,100 hz
  • Bit depth  – 16 bits
  • Length of recording – 3 minutes
  • Channels – 2

b

  • Sample rate – 8 Khz
  • Bit depth  – 4 bits
  • Length of recording – 94 seconds
  • Channels – 1

c

  • Sample rate – 48,000 hz
  • Bit depth  – 24 bits
  • Length of recording – 4 minutes
  • Channels – 4

4 A client has asked you to create a short audio loop based on a simple midi file composition.  Describe how you would go about this process.

5 Calculate the files sizes in Gigabytes for the following video stream data:-

a

  • Resolution – 800 x 600
  • Bit Depth – 16
  • FPS – 25
  • Length – 9 minutes

b

  • Resolution – 720 x 576
  • Bit Depth – 24
  • FPS – 30
  • Length – 20 minutes

Essay Questions

1 Using three common audio codecs and associated file endings discuss the relationship between file size and audio quality.

2 Discuss the different video compression standards that can be used for the simultaneous distribution of a video project over common platforms such as DVD, web and mobile device.   Include aspects such as file size, data transfer rates, quality and resolution.

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Review of some basic concepts related to digital audio processes.

Microphone Basics

March 14, 2010


Some topics related to understanding how microphones work and typical applications

Shure Guides

How to buy a microphone – simple guide relating technical characteristics to suited applications. Covers:-

  • Dynamic – Condenser comparison
  • Frequency response
  • Pick up patterns

Flash demo of different mics, different polar patterns, different distances. Needs decent headphones.

Distance factor in context of placement for different polar patterns relative to a sound source.

Microphone reach – discusses the  effect of ambient sound and polar patterns on microphone reach.

Difference between dynamic and condenser microphones – Dynamic and condenser describe the operating principal used in a microphone.

The proximity effect – Why do the bass frequencies increase as the microphone gets closer to the sound source?

Also

The Microphone – Data site has a useful library covering aspects such as

  • Microphone choice
  • Wind and vibration noise
  • Pre- amps and impedence
  • Cables

Choosing the right mic is a good place to start for a basic understanding of various mic applications.

Mics, pre-amps and impedence – why different combinations sound different.

Soundfield

High end mic systems used in OBs,  Film and TV production

Example of football OB application

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Beach Walk Audio Picture

February 18, 2010


Create an audio piece, 2 to 3 minutes long, based on a couple walking their dog along a beach during a storm.  This should give you lots of scope to create a believable  audio environment.  Build your soundtrack up using layers such as

  • Footsteps
  • Waves
  • Rain
  • Storm – thunder and lightning
  • Dog

Plus any other effects tracks that you think will help recreate the scene in the listeners imagination.

Mix all the tracks down to a stereo master

Pay attention to the different levels of each track and aim for a mix that gives a balance between them all that is clear and without distortion.

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This exercise is all about using Adobe Audition to manipulate  music samples in the multitrack.  It covers

  • Creating project folder
  • Creating a session file
  • Importing clips
  • Creating a basic 3 track arrangement lasting around 2 minutes
  • Looping clips
  • Panning two tracks
  • Fading tracks in and out
  • Adding reverb effect
  • Adding chorus effect
  • Adjusting audio levels for a final mix
  • Mixing down to a final master
  • Adding compression and equalisation to the master
  • Saving final mix as a wav file

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Audio Recording project

December 1, 2009


Simple project to record a variety of sounds using a portable audio recorder such as the Zoom H2

Make sure you are familiar with

  • Switching on the recorder.
  • Choosing the set of mics you want use
  • Monitoring the audio input
  • Setting the audio recording levels
  • Making a recording that has a minimum of unwanted extra noises i.e your hand holding the mic or rustle of your clothing.
  • Switch off  the recorder
  • Transfer files to a PC

Make 10 good quality recordings of the following

  • Birds/animals
  • Traffic
  • Door opening
  • Door closing
  • People in a large space
  • Footsteps (various surfaces)
  • Machinery/workshop

Transfer the audio files into a folder you have created on a PC, rename them according to what they are a recording of,  and put them together using an application such as Adobe Audition or Premier Pro

Save the session/project file in the folder and submit the folder for assessment.

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DMC2 Planning

November 26, 2009


Planning aid for S1 audio visual projects for Digital Media Computing level 5