Which room improvement does NOT adversely affect an audio discriminator?

New paint does not adversely affect an audio discriminator because paint generally does not alter the acoustic properties of a room in a significant way. Audio discriminators rely on sound frequencies to operate effectively. The absorption and reflection characteristics of paint are relatively minimal compared to elements such as carpeting and large furniture, which can absorb sound and alter how audio waves interact in a space.

New carpet, for example, tends to absorb sound more than hard surfaces do, which can dampen sound waves and reduce the effectiveness of audio discrimination. New furniture, especially if it is large or upholstered, can create similar sound absorption issues. New lighting, while not affecting sound directly, can produce visual distractions that might interfere with the functional operation of a security system, especially if the lighting impacts visibility for cameras or sensors.

Therefore, new paint remains a benign factor in the context of audio discrimination, preserving the system's ability to detect sounds as intended.