Speech Processing
There are four basic systems that have been used to increase the "talk power" of an AM or SSB signal. RF CLIPPING. RF COMPRESSION. AUDIO COMPRESSION AUDIO CLIPPING As the graph clearly shows, this is by far the most effective method. But it’s restricted just to SSB transmitters. That’s because the processing occurs in the IF stage of the transmitter, after the SSB signal has been generated, rather than in the audio stages.
This type of processing is commonly found in virtually all CB and HAM SSB rigs. You may have heard it called by its more common name, "ALC," or Automatic Level Control. Basically this is a simple feedback system identical in principle to the Automatic Gain Control or AGC circuits used in receivers.

Applications of speech recognition have been made in office or business systems, as well as in manufacturing, medicine, and telecommunications, and usually concern the recognition and retrieval of information, such as voice- activated data entry; the control, operation, and monitoring of various machines and devices; call-processing functions; and the automation of services normally requiring human beings. While speech recognition has many short-term applications, it also has the potential to change daily life profoundly as free communication between man and machine becomes a reality.
The perception of speech involves the recognition of patterns in the acoustic signal in both time and frequency dimensions (domains). Such patterns are realised acoustically as changes in amplitude at each frequency over a period of time. The advantage of a speech code or rule set is that there is no need for a vast storage of templates since the input signal is converted into a linguistic entity using those rules. The rules achieve their task by a drastic restructuring of the input signal.