The ML7204-001 is a speech codecs specifically developed as an analog front end of communication devices supporting VoIP(Voice over Internet Protocol). It performs compression and decompression in G.711 format with high sound quality and in G.729. A format with a high compression rate. Equipped with the PLC (Packet Loss Concealment) function, it will further improve voice quality. In addition to a two-channel analog interface, the ML7204-001 supports DMA transfer and frame transfer of parallel bus system as well as data transfer of serial bus system as the interfaces with the processor, allowing easy expansion to support multi-channels. Also incorporated is an echo canceller with a maximum of 32 ms delay; it can not only cancel line echoes when an SLIC is connected but also cancel acoustic echoes when the system supports hand-free speech. Furthermore, the ML7204-001 is equipped with an FSK signal generator and a detector for implementing the number display function.

What is more, a tone detector that can detect CED tone during fax communications is provided, helping to disable the echo canceller during mute connections. Last but not least, the ML7204-001 contains a DTMF tone detector, a number of tone generators and a three-way speech function. This is an optimum LSI to add VoIP capabilities to TAs, routers, business phones, etc.