"产生单音调的" can be translated as "producing a single tone" or "generating a monophonic sound" in English, depending on the context.
"Producing a single tone" emphasizes the act of creating or emitting a sound that consists of only one pitch or frequency.
"Generating a monophonic sound" specifically refers to creating a sound that is monophonic, meaning it consists of a single melodic line without any harmony or accompanying voices, which might be more appropriate in a musical or audio engineering context.
In most general contexts, "producing a single tone" would be a suitable and commonly understood translation.