Trainz 2012 Doppler effect
- Thread starter trex1094
- Start date
You mentioned the Doppler effect, but seem to be talking about "volume". The Doppler effect has nothing to do with the "volume" or (more correctly) the Sound Pressure Level (SPL) of a given sound.
That said, both the auditory perception of the Doppler effect and the change in SPL of an approaching train do work in TS12 -- and here's an audio recording to prove it.
The "peaks" (below) of that sound recording show how the SPLs increase as the train approaches.
(click image to view enlarged)
That said, both the auditory perception of the Doppler effect and the change in SPL of an approaching train do work in TS12 -- and here's an audio recording to prove it.
The "peaks" (below) of that sound recording show how the SPLs increase as the train approaches.
(click image to view enlarged)
Last edited:
trainman7616
Western Maryland Addict
Make sure the files are set at mono channels and not stereo
One thing to keep in mind: If a given train horn is (really) loud up close, it will still be (fairly) loud even a 1/2 mile away.
Sound intensity level decreases, with doubling of the distance, by −6 dB. Which means if you do the math: If a given train horn's SPL =120 db at 10 feet, then the horn's SPL = 72 db at 2640 feet (1/2-mile)
SPL = 120 db = ~volume of a rock concert, sitting on the front row (Really LOUD!)
SPL = 72 db = ~volume of vacuum cleaner running, at 3 feet (Still pretty loud!)
Sound intensity level decreases, with doubling of the distance, by −6 dB. Which means if you do the math: If a given train horn's SPL =120 db at 10 feet, then the horn's SPL = 72 db at 2640 feet (1/2-mile)
SPL = 120 db = ~volume of a rock concert, sitting on the front row (Really LOUD!)
SPL = 72 db = ~volume of vacuum cleaner running, at 3 feet (Still pretty loud!)
The Sound doesn't change at all what so ever even after the train has passed and no Doppler effect occurs
shaneturner12
Tutorial Creator
Have you checked that the 3D sound effect is turned on under Main Menu > Options > Sound Settings?
Shane
Shane
Yes; it's enabled all the other horns have the proper effects just not the ones I've modified
shaneturner12
Tutorial Creator
I would suggest you compare your modified assets against ones that do work in that case.
Shane
Shane
The only changes were made via explorer by simply changing out the audio files and renaming the horn
the config files were untouched. Simply replace horn_start horn_loop with the horn start and horn loop of my own. Overwrite the other ones. Horn works just no doppler of distance effects. So if I have a loco
and blow the horn from the exterior view. It's loud obviously, but let's say an AI is following me 4 miles behind me. And hits a horn trigger on the track when he blows it's sounds exactly the same as if I just blew it. Even though he's 4 miles behind me
norfolksouthern37
what's a normal map?
see post 3 above...
yes mine are in stero that I can confirm from when I rendered the sounds. Somehow I overlooked post 3
In Trainz, you can hear a horn blow on a train that located 4 miles away. But you can also hear a train's horn 4 miles away in the real world.
"Volume" is a subjective term, that's virtually meaningless, since people have different abilities in regards to detecting relative "volume" of a given sound. A well-trained musician might be able to detect a difference of only 6 dB or 3 dB, but someone else might not be able to detect a 12 of 24 dB difference in sound, another person might not be able to detect a 48 dB difference in sound. And this is why its only meaningful to compare actual measurements of sound by an agreed upon standard, such as Sound Pressure Levels (SPL) measured in decibels (dB).
According to the laws of physics: A train horn that's ~120 SPL @ 10 feet will be ~54 SPL @ 4 miles. Whether or not a given human considers that (distance horn) to be "loud" (or not) is subjective. 54 SPL = ~ "volume" of someone speaking in a "normal speaking voice" @ 3 feet.
"Volume" is a subjective term, that's virtually meaningless, since people have different abilities in regards to detecting relative "volume" of a given sound. A well-trained musician might be able to detect a difference of only 6 dB or 3 dB, but someone else might not be able to detect a 12 of 24 dB difference in sound, another person might not be able to detect a 48 dB difference in sound. And this is why its only meaningful to compare actual measurements of sound by an agreed upon standard, such as Sound Pressure Levels (SPL) measured in decibels (dB).
According to the laws of physics: A train horn that's ~120 SPL @ 10 feet will be ~54 SPL @ 4 miles. Whether or not a given human considers that (distance horn) to be "loud" (or not) is subjective. 54 SPL = ~ "volume" of someone speaking in a "normal speaking voice" @ 3 feet.
The Doppler Effect is related to relative speed, not volume.
As a train approaches a stationary observer the wave form of the horn is compressed, so the frequency (pitch) to a observer is higher.
As the train recedes the opposite applies, so the pitch is lower.
The effect is noticeable here (best watched full screen and in HD):
Listen to the pitch of the horn at 2:30. Then again at 3:05.
Phil
As a train approaches a stationary observer the wave form of the horn is compressed, so the frequency (pitch) to a observer is higher.
As the train recedes the opposite applies, so the pitch is lower.
The effect is noticeable here (best watched full screen and in HD):
Listen to the pitch of the horn at 2:30. Then again at 3:05.
Phil
I don't know about the "horn triggers" specifically, but a Trainz' "soundscript" container can be set to defy the laws of physics via its "distance" setting, which allows the script writer to set the distance range from the source, in meters, in which a given sound is audible. In other words, you can setup a sound to be heard much further, and at a higher volume level, than it would be heard in the real world.
MeowRailroad
CKRail
Is the doppler effect how horns distort or fade in volume as they pass?
BuilderBob
New member
No. The doppler effect is the change in pitch as the sound approaches and then recedes. The higher the speed of approach the higher the pitch - the higher the speed at which it recedes, the lower the pitch.
http://en.wikipedia.org/wiki/Doppler_effect
Meanwhile, if a train was blowing its horn while running on a perfectly circular track around you, the sound would always be the same distance away from the listener. Since there is zero radial velocity there would be no Doppler effect.
Keywords: approaches, recedes