Hall-research AD-340 Instrukcja Użytkownika Pobierz pdf (Strona 18)

Model AD-340

In calculation of delay needed for given distance the unit includes correction

needed for Haas effect. This correction masks localization of delayed audio

source, so the listener still perceives the sound coming from far source.

The maximum number of milliseconds of delay possible is a function of the audio

sampling rate as shown in the table below:

Sampling Rate 32 kHz 44.1 kHz 48 kHz 96 kHz

Max Delay in MSEC 510 ms 370 ms 340 ms 170 ms

The maximum distance also depends on the audio sampling rate and the air

temperature (which affects the speed of sound slightly) as shown below.

Temp 32 kHz 44.1 kHz 48 kHz 96 kHz

Max Delay in

FEET @ 72 °F

550 ft 394 feet 360 ft 169 ft

Max Delay in

METERS @ 23 °C

168 m

120 m 110 m 52 m

The delay values are automatically calculated and synchronized between the

different delay type options by the system, so by changing the values for one

delay type the other values are automatically changed as well. This automatic

calculation also applies to temperature changes. For external delay based on

FEET or METERS the delay in milliseconds is calculated based on the speed of

sound at the given temperature (which can be set by the user), and 20 ms is

added due to the psychoacoustic “HAAS Effect.”

Temperature Compensation: The speed of sound depends on the air

temperature. (Sound slows down with colder temperatures and speeds up with

hotter temperatures.) The table below shows some calculations. The nominal

values for speed of sound are 1130 ft/s at 72°F or 345 m/s at 23° C.

Fahrenheit Speed of Sound ft/ms

32°F 1.08

50°F 1.10

72°F 1.13

90°F 1.14

Celsius Speed of Sound m/ms

10°C 0.337

23°C 0.345

30°C 0.349

45°C 0.357

The more advanced “Temperature Compensation” function on the GUI allows the

user to enter the actual air temperature if desired. The system will automatically

update the max distance allowed in both FEET and METER Delay Types and the

corresponding delay in milliseconds based on either the FEET or METER

settings. (Note: temperature does not affect the video frame delay functions used

for internal delay.) The allowable temperature range is 32-122°F (0-50°C),

although in most cases using the default setting at 72°F (23 °C) will suffice.

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