Differences

This shows you the differences between two versions of the page.

--- atrac3p:serialized_envelope_y_coordinates [2010/05/25 22:25] – megadiscman
+++ atrac3p:serialized_envelope_y_coordinates [2010/10/23 17:44] (current) – add "with at least one point" like it is in the X coordinate page megadiscman
@@ Line 2: / Line 2: @@
 The envelope Y coordinates are values between 0 and 15, with 0 -> 2<sup>-6</sup>, 6 -> 1 and 15 -> 2<sup>9</sup>. The Y coordinates can be stored in different modes.
-A mode once chosen is used for all stored envelopes.
+A mode once chosen is used for all stored envelopes. Bands with 0 envelope points don't have any envelopes and thus no data stored.
 ==== Encoding Modes ====
@@ Line 33: / Line 33: @@
   * For each point in each envelope: 4 bits
 === Encoding mode 1 on master channel: variable length encoding; delta between points ===
-  * For each envelope
+  * For each envelope with at least one point
     * Code from [[envelope y trees#envelope y tree]] for the first Y value
     * For each point after the first one
@@ Line 41: / Line 41: @@
     * Code from [[envelope y trees#delta-to-master y tree]] difference to corresponding master point
 === Encoding mode 2 on master channel: variable length encoding; delta between envelopes ===
-  * For each envelope
+  * For each envelope with at least one point
     * Code from [[envelope y trees#envelope y tree]] for the first Y value
     * For each point after the first one
       * Code from [[envelope y trees#delta-to-prev-envelope y tree]] difference to corresponding point in previous envelope
 === Encoding mode 2 on slave channel: choose master/1 or slave/3 ===
-  * For each channel: 1 bit mode selection
+  * For each envelope with at least one point: 1 bit mode selection
     * If that bit is zero: //nothing//, cloning like in mode 3 on slave
     * If that bit is one: