ProVoice is Tyco Electronics

Tyco Electronics

TE Connectivity, Ltd., previously known as Tyco Electronics, Ltd., and formerly a segment of Tyco International, is a leading global provider of engineered electronic components, network solutions, undersea telecommunication systems, and specialty products for customers in more than 150 countries...

' (formerly M/A-COM, Ericsson

Ericsson

Ericsson , one of Sweden's largest companies, is a provider of telecommunication and data communication systems, and related services, covering a range of technologies, including especially mobile networks...

 and GE

Gê

Gê are the people who spoke Ge languages of the northern South American Caribbean coast and Brazil. In Brazil the Gê were found in Rio de Janeiro, Minas Gerais, Bahia, Piaui, Mato Grosso, Goias, Tocantins, Maranhão, and as far south as Paraguay....

) implementation of IMBE

IMBE

Improved multi-band excitation is a proprietary vocoder developed by Digital Voice Systems, Inc. .It is the predecessor of their Advanced Multi-Band Excitation .- External links :*...

 digital modulation for radio communications. It is not APCO-25 compliant, but does use the same IMBE

IMBE

Improved multi-band excitation is a proprietary vocoder developed by Digital Voice Systems, Inc. .It is the predecessor of their Advanced Multi-Band Excitation .- External links :*...

 vocoder

Vocoder

A vocoder is an analysis/synthesis system, mostly used for speech. In the encoder, the input is passed through a multiband filter, each band is passed through an envelope follower, and the control signals from the envelope followers are communicated to the decoder...

 developed by Digital Voice Systems, Inc. (DVSI). The technical difference between ProVoice and the APCO Project-25 standard is how error correction and modulation is provided to transmit the data.