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Topic: "is_ratio" value in stereo processing (Read 2091 times) previous topic - next topic
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"is_ratio" value in stereo processing

In MP3 stereo processing,"is_ratio" value is calculated by the following equation

is_ratio = tan((double)is_pos * (PI / 12));

And it is used as
1/1+is_ratio and is_ratio/1+is_ratio.

Is there a case where is_ration becomes -1 and the second equation becomes infinity?

Is is guarenteed that is_pos will never have a value which makes the tan value -1?

Can some one please give some insight and thanks in advance.
Tony