You probably have come here because you are looking for information on Compandors or Companders for audio signals. And especially on software implementations of such compandors.
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The CX (*) Compandor has been designed by CBS Laboratories in the late 1970s. It has been used on vinyl discs and on LaserDisc. You can read more on the CX Compandor on Wikipedia.
A software decoder is available, you can download it from here.
The SHA256 checksum of this file is: A5DE7732D3F5D8AFA2BA8CC9C175635A35775F979A912E56FF99AE4C7F8A5380
And a FAQ page for this software can be found here.
The telcom c4 (*) compandor has been designed by Telefunken ANT in the early 1970s. It has been used in the professional audio world and on professional tape recorders. You can get some information on telcom c4 on Wikipedia.
A software decoder is available, you can download it from here.
The SHA256 checksum of this file is: 7D63F98DC89E22255B4E3E139C3C477F59DC0B9999D2EA6916930B374FD14B0A
And a FAQ page for this software can be found here.
The High Com (*) compandor has been designed by Telefunken in the early 1970s. It has been used on consumer cassette recorders. High Com II is a variant that has been specially developed for high-end cassette deck manufacturer Nakamichi. You can read more on High Com and its variants on Wikipedia.
A software decoder is available, you can download it from here.
The SHA256 checksum of this file is: BE3A77AEF52BE4E99E1C7234E5A2970322C04EC5BCC2E5A15578889A71E2AE0A
And a FAQ page for this software can be found here.
(*) Trademarks are property of their respective owners.