Telephone Hybrids

Audio Codecs

DAB/DAB+

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The MAGIC Audio Contribution System is designed especially for the contribution of audio signals from the studio to transmitter locations (STL). With our Audio contribution system 10 or more Stereo audio signals inclusive data for e.g. RDS can be transmitted. The main contribution is done via E1 (2-Mbit) or IP and the backup contribution link is implemented via ISDN, E1 or IP.

System variants

  • MAGIC AC1 XIP RM 2M

This version consists of an E1 Multiplexer, an ISO/MPEG Layer 2 Codec and a 7-kHz Decoder for audio monitoring of the backward channel. Only limited by the channel capacity of the E1 line the system can transmit any number of Stereo Audio signals. Further programmes can be added by additional audio codecs (MAGIC AC1 XIP RM) which are linked to the E1 Multiplexer via IP. The E1 and the IP interface can be configured as main or backup path according the technical requirements. Note that this system does not offer an ISDN backup. A second LAN interface is optional available.

  • MAGIC AD1 XIP RM 2M

The pure ISO/MPEG Layer 2 Decoder version with E1 Multiplexer contains also a 7-kHz audio encoder for the transmission of the monitoring backward channel. The E1, IP and ISDN interface can be configured as main or backup path according the technical requirements. A second LAN interface is optional available.

  • MAGIC AC1 XIP RM CS

Beside the ISO/MPEG Layer 2 Codec the system has also an integrated 7-kHz audio decoder for the monitoring of the backward channel. The IP and ISDN interface can be configured as main or backup path according the technical requirements. A second LAN interface is optional available.

  • MAGIC AD1 XIP RM CS

This version offers an ISO/MPEG Layer 2 Decoder, an IP- and ISDN interface in addition to a 7-kHz audio encoder for the transmission of the monitoring backward channel. The IP and ISDN interface can be configured as main or backup path according the technical requirements. A second LAN interface is optional available.

Application

The block diagram shows the transmission of multiple Stereo audio signals plus RDS data via the main contribution path E1 to different transmitter locations. Depending on the available backup network on the transmitter site either ISDN or LAN can be used. A monitoring of the transmitter output signal can be fed into the integrated 7-kHz Encoder, which requires a LAN connection between the studio and transmitter site. The configuration and monitoring is possible from one or more locations. The LAN interface supports unicast, simulcast (simultaneous distribution of an identical signal of up to five transmitter sites) as well as multicast.

System Management

The Management Software allows a central configuration,management and monitoring of up to 40 Encoders and Decoders in total which are installed in the contribution network at the same time.