Programmer Guide/SPU Reference/UCONV: Difference between revisions

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=====Function:=====
;Description:
This atom performs a conversion of the input <var>X</var> (containing physical data) into another unit or domain. The type of conversion is controlled by the selection input <var>TYPE</var> and the parameter inputs <var>A</var> and <var>B</var>. The input data can be stored in a number or vector. If the input is a vector, the conversion is applied to all elements.


This atom performs a conversion of the vector <var>x</var> (containing physical data) into another unit or domain. The type of conversion is controlled by the selection input <var>type</var> and the parameter inputs <var>a</var> and <var>b</var>. The input data can be stored in a number or vector. If the input is a vector, the conversion is applied to all elements.
{|class="einrahmen"
 
!<var>TYPE</var>
Conversion type selected by input <var>type</var>
!default<BR><var>A</var>
 
!default<BR><var>B</var>
{|
!applied transformation /conversion
|-
|
|
|
|
|-
|value of type
|default values
|applied transformation /conversion
|-
|a
|b
|-
|-
|<code>0</code> or <code>LINEAR</code>
|<code>0</code> or <code>LINEAR</code>
|<code>1</code>
|<code>1</code>
|<code>0</code>
|<code>0</code>
|Linear transformation. Parameter a is used as slope and parameter <var>b</var> as offset: <var>y</var><code>=</code><var>a</var><code>.</code><var>x</var><code>+</code><var>b</var>
|Linear transformation. Parameter <var>A</var> is used as slope and parameter <var>B</var> as offset<BR><var>Y</var>=<var>A</var>.<var>X</var>+<var>B</var>
|-
|-
|<code>1</code> or <code>HZ2CENT</code>
|<code>1</code> or <code>HZ2CENT</code>

Revision as of 14:07, 9 May 2011

UCONV - amp/frq value conversions

Usage:

UCONV x type a b

Inputs:
x number or vector to be converted
type type of conversion
a conversion parameter a
b conversion parameter b
Outputs:
y converted number or vector (same type as x)
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(x/a)+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.2(x-b)/1200
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(x/a)
6 or LOG2LIN 1 20 Convert from logarithmic to linear scale. Parameter a is used as reference value and b as factor: y=a.10x/b
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.
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