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Battlezone - set unclipped volume to 50% slider position. This allows you to drive the audio into clipping like a real game.

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This commit is contained in:
Derrick Renaud 2009-10-23 02:34:44 +00:00
parent 7786174e1c
commit 6dfd56c416
1 changed files with 16 additions and 2 deletions
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18
src/mame/audio/bzone.c
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@ -25,6 +25,14 @@ D0 explosion enable gates a noise generator
#include "sound/discrete.h"
#include "sound/pokey.h"
/* This sets an amount of gain boost to apply to the final signal
* that will drive it into clipping. The slider is ajusted by the
* reverse factor, so that the final result is not clipped.
* This allows for the user to easily adjust the sound into the clipping
* range so it sounds more like a real cabinet.
*/
#define BZ_FINAL_GAIN 2
#define BZ_NOISE_CLOCK 12000
#define TTL_OUT 3.4
@ -79,6 +87,8 @@ D0 explosion enable gates a noise generator
#define BZ_R27 RES_K(330)
#define BZ_R28 RES_K(100)
#define BZ_R29 RES_K(22)
#define BZ_R30 RES_K(10)
#define BZ_R31 RES_K(100)
#define BZ_R32 RES_K(330)
#define BZ_R33 RES_K(330)
#define BZ_R34 RES_K(33)
@ -367,6 +377,10 @@ static DISCRETE_SOUND_START(bzone)
/************************************************/
/* FINAL MIX */
/************************************************/
/* We won't bother emulating the final gain of op-amp IC K5, pin 14.
* There signal never reaches a value where it clips, so we will
* just output the final 16-bit level.
*/
/* not sure about pokey output levels - below is just a estimate to get a 5V signal */
DISCRETE_INPUTX_STREAM(BZ_POKEY_SND, 0, 5.0 / 11000, 0)
@ -375,7 +389,7 @@ static DISCRETE_SOUND_START(bzone)
BZ_INP_SOUNDEN,
BZ_SHELL_SND, BZ_EXPLOSION_SND, BZ_ENGINE_SND, BZ_POKEY_SND,
&bzone_final_mixer_desc)
DISCRETE_OUTPUT(NODE_280, 50000)
DISCRETE_OUTPUT(NODE_280, 50000 * BZ_FINAL_GAIN)
DISCRETE_SOUND_END
@ -405,5 +419,5 @@ MACHINE_DRIVER_START( bzone_audio )
MDRV_SOUND_ADD("discrete", DISCRETE, 0)
MDRV_SOUND_CONFIG_DISCRETE(bzone)
MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0 / BZ_FINAL_GAIN)
MACHINE_DRIVER_END