0dbfs

0dbfs --  Sets the value of 0 decibels using full scale amplitude.

Description

Sets the value of 0 decibels using full scale amplitude.

Syntax

0dbfs = iarg

Initialization

iarg -- the value of 0 decibels using full scale amplitude.

Performance

The default is 32767, so all existing orcs should work.

These calls should all work:

ipeak = 0dbfs
        

asig oscil 0dbfs,freq,1
out  asig * 0.3 * 0dbfs
        

and so on.

As for documentation: the usage should be obvious - the main thing is for people to start to code 0dbfs-relatively (and use the ampdb() opcodes a lot more!), rather than use explicit sample values.

Floats written to a file, when 0dbfs = 1, will in effect go through no range translation at all. So the nunbers in the file are exactly what the orc says they are.

NoteBIG NB
 

All the main sample formats are supported, but I haven't got around to dealing with the char formats. Probably it's straight-forward...

I have tried to cover the main utils - adsyn,lpanal etc. But there are bound to be things missing, sorry.

Some of the parsing code is a bit grungy because I have a variable with a leading digit!

Examples

Here is an example of the 0dbfs opcode. It uses the files 0dbfs.orc and 0dbfs.sco.

Example 1. Example of the 0dbfs opcode.

/* 0dbfs.orc */
/* Written by Kevin Conder */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Set the 0dbfs to the 16-bit maximum.
0dbfs = 32767

; Instrument #1.
instr 1
  ; Linearly increase the amplitude value "kamp" from 
  ; 0 to 1 over the duration defined by p3.
  kamp line 0, p3, 1

  ; Generate a basic tone using our amplitude value.
  a1 oscil kamp, 440, 1

  ; Multiply the basic tone (with its amplitude between 
  ; 0 and 1) by the full-scale 0dbfs value.
  out a1 * 0dbfs
endin
/* 0dbfs.orc */
        
/* 0dbfs.sco */
/* Written by Kevin Conder */
; Table #1, a sine wave.
f 1 0 16384 10 1

; Play Instrument #1 for three seconds.
i 1 0 3
e
/* 0dbfs.sco */
        

Credits

Author: Richard Dobson

May 2002

New in version 4.20