Surround Sound Quiz

1975

This popular film format Uses 4 Channels and is encoded to 2 tracks

Left, Centre, Right, and mono surround, some times called LCRS

“Apocalypse Now” released in 1979, 3 channels in the front and 2 in the rear

True

1991

Left and Right, Centre, Left and right Surround, A Low Frequency Effects (LFE) channel to make up the Six-Channel 5.1 system.

A surround format, used in motion pictures, music, and digital television.

The format consists of 6 discrete speaker sources

3 across the Front, 2 are in the Rear, a Subwoofer

Cinema Application

the same environment in which it is reproduced.

Level and calibration standards were established to ensure uniformity across various playback environments.

85db SPL for Film (pinknoise at 85db -20dBfs = 0 VU)

Uses 8 discrete audio channels to establish 4 surround zones in a theatre., 2 surround speakers at the side and 2 surround speakers in the back

Toy Story 3 in 2010

A new audio platform introduced in 2012

1. Seating Position in Home Theatre, 2. Left and Right speakers, 3. Center Speaker, 4. Subwoofer, 5. L/R surround Speakers, 6. L/R rear surround Speakers, 7. L/R top front overhead speakers, 8. L/R top rear overhead speakers

A piece of string on a pic of cardboard with correct angles drawn on the cardboard. That gets stretched out of each tweeter.

Comb filtering and phase issues may occur, therefore providing false results in your mix,

343 m/s This also equates to 1235 km/h, 767 mph, and 1125 ft/s

The sound from each speaker arrives at the listening position at the correct time.

Signal Delay will be required to achieve the intended result.

Which of the remaining speakers will require signal delay

1ms per foot or 3ms per meter.

The delay times of the Center and Surround Channels may need to be adjusted.

Calculating the distances from each speaker to the listener.

Lower the level of Bass impact

Do not reproduce below 30hz

Low Frequency Effects

‘Boom” Channel because it is there to enhance the low frequencies of a film, so you get extra boom out of an earthquake, plane crash, explosion,etc.

Response up to 80hz / 120 hz

Has an additional 10dB or headroom built into it, This is needed to accommodate the extra power required to reproduce the low-frequency content without distortion

We monitor this channel 10dB louder

Low Frequency Effects (LFE), because it it not full bandwidth (less data

The frequency band between 20 and 120hz is 10 dB higher than the equivalent frequency band for any of the full-range channels

For each of the 5 main channels, Pink noise is adjusted for 85 dB C-weight slow.

The test noise used for Subwoofer calibration should be band-limited pink noise, Low pass filtered at 120 Hz.

an RTA is required.

You can approximate the settings with the SPL meter

90db SPL C-weight slow

band-limit the information for this channel.

Brickwall filter the LFE signal at 80 / 120 hz

a Sixth or seventh order 120hz low pass filter must be included in the monitoring chain., It’s advisable to include this filter on the mix bus before the monitor such that both the recorded information and the heard information are band-limited.

heard substantial bass information above 120hz in the mix.

Is a circuit that takes all the Frequencies below 80Hz from the 5 main channels and adds it to the signal going to the Sub speaker.

This enables the effective response of the system to be lowered to about 30hz

Most consumer surround systems contain a bass management circuit

Monitor option that can be switched in and out during the mix giving us the option to monitor the way the consumer might listen at home.

Any unwanted Low Frequencies in your mix

Carries additional bass information to supplement the bass information in the main channels., The signal in the LFE channel is calibrated to monitor 10 dB higher.

False

True

is bass information from to all 5 channels in addition to the bass information that is mixed to the LFE Channel

Bass management, Speaker

True

Surround sound for picture is meant to keep your attention on screen., Music only surround has no screen to focus on and no exit sight to worry about., LFE is intended for special effects like Explosions and Earthquakes.

The Exit sign effect, Which means that your attention is drawn away from the screen to the exit sign when the information is too loud.

Use the surround channels to enhance rather than distract from the overall experience.

Anything that requires some low frequency bass extension can be put into the subwoofer via the LFE channel. A littler bass or kick might be an obvious choice