TABLE OF CONTENTS Software-defined cognitive radios (CRs) use voice as a primary input/output modality and are expected to have substantial computational resources capable of supporting advanced speech and audio-processing applications. This chapter extends previous work on military speech applications (see, e.g., Ref. [1]) to cognitive-like services that enhance military mission capability by capitalizing on automatic processes, such as speech-information extraction and understanding the environment. Such capabilities go beyond interaction with the intended user of the softwaredefined radio (SDR) they extend to speech and audio applications that can be applied to information that has been extracted from voice and acoustic noise, gathered from other users and entities in the environment. For example, in a military environment, situational awareness and understanding could be enhanced by informing users based on processing voice and noise from both friendly and hostile forces operating in a given battle space. This chapter provides a survey of a number of speech and audio-processing technologies and their potential applications to CR, including:
A description of the technology and its current state of practice.
An explanation of how the technology is currently being applied, or could be applied, to CR.
Descriptions and concepts of operations for how the technology can be applied to benefit users of CRs.
A description of relevant future research directions for both the speech and audio technologies and their applications to CR.
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