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Just a gut feel – the low bit rate speech coding work I have been involved with in the past used roughly that amount of FEC. D-star using 1200 bps FEC on top of 2400 bps voice. There are some HF Ham systems that use no FEC with 1200 bit/s voice.
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Thanks Denis. Yes for a complete digital radio system I agree some form of forward error correction is a good idea, and unequal error protection is a good approach. However I don’t think FEC should be part of the speech codec – there are some applications (like VOIP) that won’t need it. It’s a separate layer, like the modem. There are also techniques that involve no extra bits, like packet repetition.
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This allows several phone calls to use the space that just one call would have occupied in a circuit-switched network. In the case of an office, telephones might be connected to a private branch exchange (PBX), a device designed to connect a number of phones or extensions to an outside line. Using a gateway, a device used to translate the standard circuit-switched signal generated by the telephones into digital information that can be sent over the data network. This signal is usually an IP signal, the standard protocol used by most data networks. One of the advantages of using packet-switched networks to carry telephone communication is that the infrastructure is already largely in place in the form of the many data networks that make up the Internet, and that infrastructure is already understands the technology. There are two major protocols used by VoIP technology to allow telephones, computers and other devices on the data network to communicate with each other: H.323 and SIP. The H.323 standard, a suite of protocols created by the International Telecommunications Union is a very wide-ranging and very complicated protocol, providing specifications for a range of communication including video conferencing, data sharing and VoIP, and it can be complicated to set up. The Session Initiation Protocol (SIP) emerged after H.323 as an alternative, guided by the Internet Engineering Task Force. SIP is a much simpler, more streamlined protocol developed specifically for VoIP use, and designed to employ other protocols in handling parts of the communication process. Using either gateway devices, or software applications on computers, VoIP technology can allow users to communicate by voice from computer to computer, computer to telephone, telephone to computer or telephone to telephone. Businesses can take advantage of the technology by using it to route voice data over their existing data networks, or by purchasing VoIP services from IP service providers. VoIP technology is growing in acceptance, and it seems inevitable that the cheaper, more efficient technology will play an important role in the world’s telephone communications. But it can also mean immediate cost savings and improvement in efficiency for businesses that chose to implement it now.