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Appendices : MPEG Settings (MainConcept Encoder) Page 257
Joint Stereo: This option can convert the sound to mono in the lower frequency range (which can hardly be per-
ceived by the human ear). This results in an enhancement of the stereo quality in the median and higher fre-
quency ranges. The setting is useful if the audio bitrate is below 200 Kbps.
Dual Channel: In this case both audio channels are output separately as mono channels; it is normally used for
two-channel sound. The compression of the channels takes place separately.
Single Channel: Another expression for mono audio.
Audio Bitrate (kbps): 32-384 This specifies the bitrate of the audio stream.
Depending on the MPEG type selected, some values may not be available. Increasing the bitrate will yield better
sound quality and result in larger files, or if the total bitrate is limited it will mean less of the total bitrate is avail-
able for the video.
Set private bit Just a spare bit in the audio headers, which is user defined. DVD specifies it shall be 0.
Set copyright bit Specifies whether the audio is copyrighted or not, this setting is completely arbitrary; it
has no effect whatsoever.
Set original bit Specifies whether the audio is a copy or an original, this setting is completely arbitrary; it
has no effect whatsoever.
Enable CRC: Specifies whether a CRC is embedded in each audio frame, both SVCD and DVD specify
enabled.
Psycho-acoustic model Two different models (1 and 2) specified by MPEG to compute the "just noticeable noise
level".
PCM/AES details:
Dynamic range control The option is a recommended gain value which can be applied to all audio samples
decoded from the first access unit. Ticking the checkbox enables the Dynamic range con-
trol. The setting does not affect the encoding of the audio at all. It is simply a value decod-
ers may use when playing the audio.
Mute flag Flag to the player whether to mute or not when all samples in an audio frame are zero.
Emphasis (48 KHz only) Flag to the player whether emphasis is to be applied to all audio samples from the start of
the audio stream.
Gain (dB) The Gain value (X and Y) is a recommended gain value to be applied to all audio samples
by the player, where:
Gain = 24.082 - 6.0206 * X - 0.2007 * Y.