Dolby Laboratories P/N 91659 manual LFE Enable, Bitstream Mode, Dialog Normalization

DolbyRemote Installation and Operation Dolby Digital Parameters

designated as two numbers, A/B, with A indicating the number of front channels, and B indicating the number of rear (surround) channels.

The following table lists all eight modes and defines which input channels are used for encoding based on the selected mode. Channel names are designated as follows: Left (L), Right (R), Center (C), Left Surround (Ls), and Right Surround (Rs). Note that the Ls channel is the surround source for modes having a single surround channel (2/1, 3/1). In the case of mode 1+1, two completely independent program channels can be sourced from the L and R inputs (dual mono) and encoded into the output bitstream. 1+1 mode is not suitable for DVD or DTV applications.

The Audio Coding Mode options available for the DP567 are 1+1 Dual Mono, 1/0 Mono and 2/0 Stereo.

Table 4-1Audio Coding Modes

Audio Coding Mode

1+1 (Dual Mono)

1/0 (Mono)

2/0 (Stereo)

3/0

2/1

3/1

2/2

3/2

Encoded Channels

L, R

C

L, R

L, C, R

L, R, Ls

L, C, R, Ls

L, R, Ls, Rs

L, C, R, Ls, Rs

4.1.5LFE Enable

LFE Enable determines whether the low frequency effects channel is enabled. This is dependent on the setting of the audio coding mode and is only active with coding modes greater than two channels. This option is also not available on the DP567.

4.1.6Bitstream Mode

Bitstream Mode is an informational parameter that indicates the data information service of the encoded Dolby Digital bitstream. It does not affect internal Dolby Digital encoding.

4.1.7Dialog Normalization

Dialog Normalization allows the user to set the value of dialnorm, a parameter that tells the decoder how much the average dialogue level of the encoded audio is below digital full scale. The decoder uses this to normalize the replay level. This means

4-3