Thursday, October 22, 2009

Sound Mixing of Television Programming

Sound mixing of television programming is also referred to as audio mixing. The purpose of sound mixing of television programming is to take all of the sources of the audio portion of the TV program and combine them into a single sound track that is properly synchronized with the video portion of the program. I know everyone has watched a Japanese action film where the actors were speaking in Japanese and the sound track was in English. You can see the actor�s lips moving incorrectly for what you are hearing. Most audiences will tolerate that particular problem when watching a foreign film. The purpose of sound mixing is to prevent any obvious inconsistencies between what you see and what you hear from being apparent to the viewing audience.

Sound mixing of television programming combines the volume and frequencies from a variety of sound sources to get the proper balance to create the effects the director wants in the program. Typically there will be sound from music played by an orchestra, band or even a single instrument. There usually are sound effects from the actions that you are seeing on the screen like when somebody drops something. The sound effects may have been recorded at the same time as the scene was shot or they may have been created later by sound engineers and added to the sound track. Of course, you have the actor�s dialogue as well.

Sound tracks for sound mixing of television programming start out as separate recordings. A sound engineer combines the tracks into a single multi track recording that is synchronized with the video part of the show. That means that they can�t add the sound track until after the video editing has bee completed. Frequently that means they have to completely re-record the entire sound track to makes the changes that are needed to resynchronize everything after scenes have been added or removed during the video editing.

Professionals use an audio mixing console for the sound mixing of television programming. This console is a sophisticated electronic device that has the necessary electronic components to manipulate the volume, add special effects such as reverb, adjust the different track frequencies so they don�t cancel each other out and adjust the bass and treble of each track independently. Sound mixing of television programming on a personal computer is also gaining popularity. More and more independent artists are starting to use their personal computers for digital recording and mixing their work. One reason is because although the software is very expensive, compared to an audio mixing console, it is relatively cheap and perfect for lower budget productions.

1 comment:

  1. Web casting, or broadcasting over the internet, is a media file (audio-video mostly) distributed over the internet using streaming media technology. Streaming implies media played as a continuous stream and received real time by the browser (end user). Streaming technology enables a single content source to be distributed to many simultaneous viewers. Streaming video bandwidth is typically calculated in gigabytes of data transferred. It is important to estimate how many viewers you can reach, for example in a live webcast, given your bandwidth constraints or conversely, if you are expecting a certain audience size, what bandwidth resources you need to deploy.

    To estimate how many viewers you can reach during a webcast, consider some parlance:
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    One viewer hour: 1 viewer connected for 1 hour
    100 viewer hours: 100 viewers connected for 1 hour…

    Typically webcasts will be offered at different bit rates or quality levels corresponding to different user’s internet connection speeds. Bit rate implies the rate at which bits (basic data units) are transferred. It denotes how much data is transmitted in a given amount of time. (bps / Kbps / Mbps…). Quality improves as more bits are used for each second of the playback. Video of 3000 Kbps will look better than one of say 1000Kbps. This is just like quality of a image is represented in resolution, for video (or audio) it is measured by the bit rate.

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