Programmer Guide/SPU Reference/UCONV: Difference between revisions
From STX Wiki
Jump to navigationJump to search
| Line 62: | Line 62: | ||
|<code>20</code> | |<code>20</code> | ||
|Convert from logarithmic to linear scale. Parameter <var>A</var> is used as reference value and <var>B</var> as factor.<BR> | |Convert from logarithmic to linear scale. Parameter <var>A</var> is used as reference value and <var>B</var> as factor.<BR> | ||
<math>Y=A \cdot 10^{\frac{ | <math>Y=A \cdot 10^{\frac{X}{B}}</math> | ||
|- | |- | ||
|<code>7 or HZ2MEL</code> | |<code>7 or HZ2MEL</code> | ||
Revision as of 13:24, 9 May 2011
Apply amplitude or frequency scale conversion.
[SPU UCONV X TYP A B OUT Y]
| input | description | data type | value type | default value |
|---|---|---|---|---|
| X | input date | number, vector | variable | |
| TYP | conversion (see description) | number (int.), string | constant | 0
|
| A, B | conversion parameters (see description) | number | variable | |
| output | description | data type | value type | comment |
| Y | converted input data | same type as A | variable |
- Description
This atom performs a conversion of the input X (containing physical data) into another unit or domain. The type of conversion is controlled by the selection input TYPE and the parameter inputs A and B. The input data can be stored in a number or vector. If the input is a vector, the conversion is applied to all elements.
| TYPE | default A |
default B |
applied transformation /conversion |
|---|---|---|---|
0 or LINEAR
|
1
|
0
|
Linear transformation. Parameter A is used as slope and parameter B as offset Y=A.X+B |
1 or HZ2CENT
|
1
|
0
|
Convert frequency from Hertz to Cents. Parameter A is used as reference frequency and B as offset in Cents. Y=1200⋅log2(XA)+B |
2 or CENT2HZ
|
1
|
0
|
Convert frequency from Cents to Hertz. Parameter A is used as reference frequency and B as offset in Cents. Y=A⋅2X−B1200 |
3 or HZ2BARK
|
- | - | Convert frequency from Hertz to Barks. Uses the transformation published by Zwicker and Fastl (1990). The parameters A and B are ignored. |
4 or BARK2HZ
|
- | - | Convert frequency from Barks to Hertz. Uses an iteration method that minimizes the distance to the forward conversion algorithm. The parameters A and B are ignored. |
5 or LIN2LOG
|
1
|
20
|
Convert from linear to logarithmic scale. Parameter A is used as reference value and B as factor. Y=B⋅log10(XA) |
6 or LOG2LIN
|
1
|
20
|
Convert from logarithmic to linear scale. Parameter A is used as reference value and B as factor. Y=A⋅10XB |
7 or HZ2MEL
|
-
|
-
|
Convert from Hertz to Mel. The parameters A and B are ignored. |
8 or MEL2HZ
|
-
|
-
|
Convert from Mel to Hertz. The parameters A and B are ignored. |
9 or HZ2ERB
|
-
|
-
|
Convert from Hertz to ERB (Equivalent Rectangular Bandwidth). The parameters A and B are ignored. |
10 or ERB2HZ
|
-
|
-
|
Convert from ERB (Equivalent Rectangular Bandwidth) to Hertz. The parameters A and B are ignored. |
- See also
<SP-atoms>
