- provides access to configure the parameters of the Encoder and Decoder of 
.
Codec configuration dialog:
Note:
The dialog is context-sensitive, and shows the ‘permissible’ settings.
The sequence of dependency is:
- Algorithm (highest priority – since it influences Sample rate, Bit rate, and Mode)
- Sample rate (which influences Bit rate and Mode)
- Bit rate (only influences mode)
- Mode
Exceptions:
Linear:
At linear PCM coding the bit rate is determined by both the sample rate and the mode used.
All APT-X algorithms:
For all APT-X algorithms, the sample rate is determined by the bit rate and the mode.
- selects which Communications Interface is to be used. The options are:
| • | ISDN (if available) |
| • | X.21/V.35 (if available) |
| • | IP (not available with CENTAURI 2000/2001) |
| • | Loop |
- sets the Encoder/Decoder dependency to either:
| • | remote |
| • | local |
In ‘Remote’ mode, the employs MAYAH’s FlashCast technology. This means:
| • | For / and /SendIt transmission: The establishing the connection dictates the parameters used. |
| • | /non Mayah Codecs transmission: evaluates the settings of the other codec and configure itself accordingly. |
In most ‘pratical’ cases, Remote is the optimum choice.
- selects which algorithm is used by the Encoder and Decoder.
| • | G.711 (i.e. digital telephone) |
| • | G.722 |
| • | MPEG-1/2 L2 |
| • | MPEG-1/2 L3 |
| • | AAC (only available on 3000/3001 and 4000/4001) |
| • | AAC (LD); must be enabled by a key code via Expert/Set Key Code |
| • | MP3 Pro; must be enabled by a key code at via Expert/Set Key Code |
| • | AAC (HE); must be enabled by a key code via Expert/Set Key Code |
| • | Linear; must be enabled by a key code via Expert/Set Key Code |
| • | 4SB ADPCM;must be enabled by a key code via Expert/Set Key Code |
| • | APT-X; must be enabled by a key code via Expert/Set Key Code |
| • | Enh. APT-X 16; i.e. enhanced APT-X with 16 bit; must be enabled by a key code via Expert/Set Key Code |
| • | Enh. APT-X 20; i.e. enhanced APT-X with 20 bit; must be enabled by a key code via Expert/Set Key Code |
| • | Enh. APT-X 24; i.e. enhanced APT-X with 24 bit; must be enabled by a key code via Expert/Set Key Code |
| • | AES/EBU transparent; must be enabled by a key code via Expert/Set Key Code Note: At transparent AES/EBU streaming a special clocking is necessary. Please find more info in application note 23 on Mayah Website (www.mayah.com/content/download/pdfs/appnotes/centauri/a_n_e_023.pdf). |
| • | DRM; must be enabled by a key code via Expert/Set Key Code |
The algorithms AAC (MEG4), AAC (HE) and linear can also be specified more detailed if system version is >= 2.1.0.50. For this the algorithm list box must be right mouse clicked to open a popup menu.
Following selections are possible:
a) AAC (MPEG 4) stream format
| • | auto |
| • | raw |
| • | adts |
| • | loas |
b) AAC (HE) signal format
| • | auto |
| • | implicit |
| • | explicit-backward |
| • | explicit-non-backward |
c) Linear stream format
| • | auto |
| • | low-byte-first |
| • | high-byte-first |
- sets the Encoder/Decoder Sample rate.
- sets the Encoder/Decoder Bit rate.
Encoder/Decoder Bit Resolution
At linear also the bit resolution can be specified if system version is >= 3.2.0.21. For this the bit rate list box must be right mouse clicked to open a popup menu.
Following selections are possible:
| • | 8 |
| • | 12 |
| • | 16 (default) |
| • | 20 |
| • | 24 |
- selects the audio mode to be used.
Standard:
| • | mono |
| • | dual mono |
| • | stereo |
| • | joint stereo |
Multi channel:
Multi channel can be used with all APT-X algorithms, linear, AAC (MPEG4) and AAC (HE) provided the referring additional function is enabled (see menu item Expert/Set Key Code). Multi channel audio applies ADAT interface.
| • | MC 4: 4 audio channels are used. |
| • | MC 4 CPE: 4 audio channels in CPE mode are used. CPE (= Channel Pair Element) means that a front and rear audio channel pair is encoded. This mode is just available for AAC (MPEG4) and AAC (HE). |
| • | MC 4 MPEG: 4 audio channels are used. In this context MPEG means that a center, a right, a left and a rear audio channel is encoded. This mode is just available for AAC (MPEG4) and AAC (HE). |
| • | MC 6: 6 audio channels are used. |
| • | MC 8: 8 audio channels are used. |
- sets the Encoder IMUX (Inverse Multiplexer) format to:
| • | Auto |
| • | CDQ/H.221 |
| • | Musictaxi |
| • | J.52 |
| • | Micda |
| • | APTX |
Note:
Inverse Multiplexing is vital for the correct synchronization of the multiple B-channels used in an ISDN transmission.
If the IMUX format is set to Auto, then automatically uses the correct IMUX format.
However,
Exception 1:
If a is to establish a connection to a CDQ Prima set to MPEG L2 and the line format is H.221, then must be configured with:
| • | Algorithm: MPEGL2 |
| • | Bit rate: 384 kbit/s (even if a lower bit rate is set on the CDQPrima) |
| • | IMUX: CDQ/H.221 |
Exception 2:
If you dial to a APT-X codec, then the IMUX format must be set APTX.