Dolby Laboratories 585 Chapter 3 Time Scaling

Model 585 Time Scaling Processor

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Chapter 3 Time Scaling

Time scaling alters th e duration of an audio signal, but leaves the perceived pitch

unchanged from the original signal. Model 585 offers stand-alone, high-quality

multichannel time scaling of short program segments by using the Transport

menu.

At the standard 48 kHz sampling rate, Model 585 can store approxim ately 23 minutes

of mono, 11.5 minutes of stereo, 6 minutes of four-channel, 4 minutes of 5.1-channel,

or almost 3 minutes of eight-channel audio material. If the sampling rate changes, the

storage capacity changes inversely: for example, a ten-percent reduction in sampling

rate gives a ten-percent increase in storage capacity.

Model 585 also can be used in combination with other products to deliver continuous,

online time scaling of longer programs.

You can use the Transport menu to record an audio clip to internal memory and

play back the clip time scaled at a rate w ithin a range of ±15 percent.

In the Transport menu, the front-panel controls perform different tasks than in all

other menus. This gives you access to the separate set of controls time scaling

requires.

The Transport menu includes Play, Record, and Program Select

menus. Entering either the Play or Record menu disables pitch shifting and

reconfigures the four center buttons to trigger the function illustrated on the display

above the button.