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E-Prime Timing Test Results
Sound Cards
The following are results of using E-Prime and the BBTK to determine the startup latency of a sound card.
The StartupLatency is defined as the time from when the sound is heard/detected via the speaker minus the time in which the sound was instructed to play in hardware.
In E-Prime, this is accomplished by having a SoundOut object send a port value via the SoundOut.OnsetSignal properties which indicates the time in which the sound is instructed to play in hardware.
This port value is recorded by the BBTK. In addition, the BBTK using the digital microphone records the timestamps in which sound is heard/detected from the speaker.
Subtracting these timestamps results in the StartupLatency value.
These are results from one paradigm under a set of hardware and circumstances.
The results of these tests do not imply that hardware will behave identically under all circumstances and configurations.
Each lab machine should be tested with appropriate equipment.
Sound Card Startup Latency Results
Adapter Type Machine Operating System Mean (ms) StdDev Min (ms) Max (ms) Sound Blaster 128 PCI Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 6.708 2.116 1.000 9.000 Sound Blaster Live! PCI Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 2.042 0.204 2.000 3.000 Sound Blaster Audigy 2 PCI Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 2.500 0.590 2.000 4.000 Sound Blaster Live! 24 External USB Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 10.208 2.146 7.000 14.000 Turtle Beach Santa Cruz PCI Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 3.083 0.408 3.000 5.000 Avance Logic AW200 PCI Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 7.667 1.274 6.000 12.000 Yamaha Xwave A571-T20 ESS Allegro PCI Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 12.792 3.189 7.000 16.000 Sound Blaster Ensoniq PCI Dell 8200 Desktop (2.2 GHZ) Windows XP SP2 4.875 3.803 1.000 16.000 Sound Blaster Audigy2 PCMCIA PCMCIA (Laptop) HP ZD7000 2.8GHZ Windows XP SP2 3.333 0.482 3.000 4.000 Conexant AMC Audio Motherboard Chipset HP ZD7000 2.8GHZ Windows XP SP2 18.000 0.000 18.000 18.000
Paradigm
The paradigm used on the E-Prime side was the SoundExperimentStation.es file.
The sound devices were set at 2 channels, 16 bit, 44.1Khz.
A white noise sound file was used.
Event generation file used on the BBTK
The results are from 24 trials per subject/session.
Equipment
E-Prime 1.2.1.841 was used.
The E-Prime desktop computer was a Dell 8200 Desktop (2.2 GHZ). 2.2 GHZ machine running Windows XP SP2.
The E-Prime laptop computer was an HP ZD7000. 2.8 GHZ machine running Windows XP SP2.
The BBTK computer was an HP ZD7000. 3.0 GHZ machine running Windows XP SP2. Hyperthreading was turned on all computers.
The MSCONFIG diagnostic mode was used to shut down background applications and services.
Click here to return to the E-Prime Timing Page.