Outputting Sound - Revision history

E5frog at 13:40, 5 November 2013

2013-11-05T13:40:56Z

E5frog at 08:30, 5 November 2013

2013-11-05T08:30:37Z

E5frog at 08:13, 5 November 2013

2013-11-05T08:13:26Z

E5frog at 22:24, 16 November 2012

2012-11-16T22:24:40Z

E5frog at 22:24, 16 November 2012

2012-11-16T22:24:18Z

E5frog: 1 revision

2012-11-16T21:23:36Z

1 revision

83.233.129.35 at 21:52, 14 August 2007

2007-08-14T21:52:13Z

New page

You can originally make 3 sounds- a 500Hz beep, a 1KHz beep or a 120Hz beep.

Coming up are recordings of various sounds mentioned.

If you want to make any other sounds try the improved [[Snippet:Playsong|PlaySong]] subroutine, this however sounds like a broken speaker on the early systems. System II has improved support for this and also sound on the tv (you can lower the volume).
In VES [[Homebrew:Pac-Man|Pac-man]] the "Pac-man theme" is played before start and the PlaySong routine is also used for the other soundeffects.

How to: You examine the frequencies of the sound effect you want in very tiny steps and then mimic it playing very short notes with the correct medium frequency at that time, the shorter pieces it's divided into the better...

Don't count on it being able to do much more while playing sound, it's very time-consuming.

<pre>

LI $60 ; high beep
OUTS 5

LI $A0 ; middle beep
OUTS 5

LI $D0 ; low beep
OUTS 5</pre>

You might need a pause after, not to turn sound off immediately and a

clr
outs 5

Here's an example of a creative soundeffect from Sean Riddles Lights Out:

<pre>
;make a bad sound
li $3f ; r1 loaded with $3f
lr 1,a
sndloop:
li $80 ; $80 loaded into A
outs 5 ; send data to port
lis 1 ; A=1
lr 5,a ; load r5 with 1
pi delay ; run the syscall "delay" (very short, only 1)
lis 0 ; same as clr
outs 5 ; send 0 on port
ds 1 ; r1 decreased
bf 4,sndloop ; run the loop again until r1 is 0
</pre>

== Making sound effects with the PlaySong routine ==

Easiest example is Pac-man, e5frog studied the frequencies of the Pac-man's eating sound, the siren, death etc in very short pieces. Then set the data in the F8 to play that approximated medium frequency for exactly the same amount of time. I e it was hacked in little pieces, analysed, thrown away and put together again with brand new pieces.

Recorded sound samples from a real Arcade Machine were analyzed.
The result came out quite fine!

Here's the result from Pac-man's eating sound:

<pre> ; Pac-man eats

db 1,116,1,116,1,116,1,163,1,163,2,178,3,191,3,202
db 20,255
db 3,207,3,199,2,191,1,172,1,172,1,161,2,161,3,161
db 20,255

; repeated over and over again</pre>

There is also a siren in the background all the time that resulted in this data:

<pre>
; Pac-man background siren

db 3,157,3,165,3,173,4,181,4,188,4,194,4,198,4,202,4,205,4,208,4,211,4,213
db 4,211,4,208,4,205,4,202,4,198,4,194,4,188,4,181,3,173,3,165

; repeated over and over again
</pre>

Unfortunately they can't be heard in the game, it couldn't be used because they take to much cpu-time... Perhaps there could be simultanous music and effects some day - if that's handled by a second processor or similar...

For now there's only a click when Pac-man eats his pills and an extra sound when monsters are blue.
Death is accurate - no need for graphics speed there since everything is still and Pac-man only changes into his death-sprite between the PlaySong routines.

There are also this:
<pre>;---------------------------------------------------------------------------
; Dying Song
;---------------------------------------------------------------------------

sfx.dying.0:
.byte 4,189,4,188,4,184,4,182,4,181
.byte 4,182,4,185,4,188,4,190,4,192,4,193
.byte 4,184,4,182,4,179,4,176,3,173,3,171
.byte 3,173,3,176,4,179,4,182,4,185,4,186
.byte 0
sfx.dying.1:
.byte 3,179,3,176,3,173,3,170,3,165,3,163
.byte 3,165,3,170,3,173,3,176,3,179,3,181
.byte 3,165,3,161,3,157,3,152,2,147,2,143
.byte 0
sfx.dying.2:
.byte 2,147,2,152,3,157,3,161,3,166,3,168
.byte 3,155,3,152,3,147,2,141,2,139,2,128
.byte 2,135,2,138
.byte 0
sfx.dying.3:
.byte 2,126,3,170,3,192,4,205,5,214,6,220
.byte 7,224,7,229,8,232,9,234,10,255
.byte 2,126,3,170,3,192,4,205,5,214,6,220
.byte 7,224,7,229,8,232,9,234
.byte 0 ; end of song
</pre>

and this:

<pre>
;---------------------------------------------------------------------------
; Extra Pac-man sound at 10000 points
;---------------------------------------------------------------------------

sfx.extraPacman:
.byte 6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,6,121,6,122,12
.byte 190,6,192,0
</pre>

@@ Line 12: / Line 12: @@
 As different machines run on different clock speeds (1.78MHz, 2.00MHz etc) the pitch of the sound varies between PAL, NTSC and also between first and second generation PAL machines.
+Sound is controlled by the upper two bits of port 5, 00 means silence and then the three standard beeps:
 <pre>
-                 LI   $60                 ; high beep
+                 LI   %01000000                 ; 1kHz beep $40
                  OUTS 5
-                 LI   $A0                 ; middle beep
+                 LI   %10000000                 ; 500Hz beep $80
                  OUTS 5
-                 LI   $D0                 ; low beep
+                 LI   %11000000                 ; 120Hz beep $C0
                  OUTS 5</pre>

← Older revision		Revision as of 08:30, 5 November 2013
Line 1:		Line 1:
−	You can originally make 3 sounds- a ~~500Hz~~ beep, a ~~1KHz~~ beep or a ~~120Hz~~ beep.	+	You can originally make 3 sounds- a 120Hz beep, a 500Hz beep or a 1kHz beep.

	Coming up are recordings of various sounds mentioned.		Coming up are recordings of various sounds mentioned.

← Older revision		Revision as of 22:24, 16 November 2012
Line 32:		Line 32:


−	Here's an example of a creative ~~soundeffect~~ from Sean Riddles Lights Out:	+	Here's an example of a creative sound effect from Sean Riddles Lights Out:

	<pre>		<pre>

@@ Line 3: / Line 3: @@
 Coming up are recordings of various sounds mentioned.
-If you want to make any other sounds try the improved [[Snippet:Playsong|PlaySong]] subroutine, this however sounds like a broken speaker on the early systems. System II has improved support for this and also sound on the tv (you can lower the volume).
+If you want to make any other sounds try the improved [[Snippet:Playsong|PlaySong]] subroutine, this however sounds like a broken speaker on the early systems. System II has improved support for this and most of these also have sound on the tv (where you can change the volume).
-In VES [[Homebrew:Pac-Man|Pac-man]] the "Pac-man theme" is played before start and the PlaySong routine is also used for the other soundeffects.
+In VES [[Homebrew:Pac-Man|Pac-man]] the "Pac-man theme" is played before start and the PlaySong routine is also used for the other sound effects.
 How to: You examine the frequencies of the sound effect you want in very tiny steps and then mimic it playing very short notes with the correct medium frequency at that time, the shorter pieces it's divided into the better...

@@ Line 8: / Line 8: @@
 How to: You examine the frequencies of the sound effect you want in very tiny steps and then mimic it playing very short notes with the correct medium frequency at that time, the shorter pieces it's divided into the better...
-Don't count on it being able to do much more while playing sound, it's very time-consuming.
+The PlaySong routine doesn't allow for any other computing while it's running, the song data and other computing (moving graphics perhaps) has to be done alternating in small portions if these are to be combined.
 <pre>
@@ Line 50: / Line 54: @@
 == Making sound effects with the PlaySong routine ==
-Easiest example is Pac-man, e5frog studied the frequencies of the Pac-man's eating sound, the siren, death etc in very short pieces. Then set the data in the F8 to play that approximated medium frequency for exactly the same amount of time. I e it was hacked in little pieces, analysed, thrown away and put together again with brand new pieces.
+Easiest example is Pac-man, e5frog studied the frequencies of the Pac-man's eating sound, the siren, death etc in very short pieces. Then set the data in the F8 to play that approximated medium frequency for exactly the same amount of time. I e it was hacked in little pieces, analyzed, thrown away and put together again with brand new pieces.
 Recorded sound samples from a real Arcade Machine were analyzed.
@@ Line 81: / Line 85: @@
 </pre>
-Unfortunately they can't be heard in the game, it couldn't be used because they take to much cpu-time... Perhaps there could be simultanous music and effects some day - if that's handled by a second processor or similar...
+Unfortunately they can't be heard in the game, it couldn't be used because they take to much cpu-time... Perhaps there could be simultaneous music and effects some day - if that's handled by a second processor or a mock multitasking song playing routine...
 For now there's only a click when Pac-man eats his pills and an extra sound when monsters are blue.
-Death is accurate - no need for graphics speed there since everything is still and Pac-man only changes into his death-sprite between the PlaySong routines.
+Death is accurately mimicked - no need for graphics speed there since everything is still and Pac-man only changes into his death-sprite between the partial PlaySong routines.
-There are also this:
+Like so:
 <pre>;---------------------------------------------------------------------------
 ; Dying Song
@@ Line 116: / Line 120: @@
 </pre>
-and this:
+There's also this:
 <pre>

← Older revision	Revision as of 21:23, 16 November 2012
(No difference)