Consider the signal \({\rm{s}}\left( {\rm{t}} \right) = {\rm{m}}\left( {\rm{t}} \right)\cos \left( {2{\rm{\pi }}{{\rm{f}}_{\rm{c}}}{\rm{t}}} \right) + {\rm{\hat m}}\left( {\rm{t}} \right)sin\left( {2{\rm{\pi }}{{\rm{f}}_{\rm{c}}}{\rm{t}}} \right){\rm{\;}}\)where \({\rm{\hat m}}\left( {\rm{t}} \right)\) denotes the Hilbert transform of \({\rm{m}}\left( {\rm{t}} \right)\) and the bandwidth of \({\rm{m}}\left( {\rm{t}} \right)\) is very small compared to \({{\rm{f}}_{\rm{c}}}\). The signal \({\rm{s}}\left( {\rm{t}} \right)\) is a

• A. high-pass signal
• B. low-pass signal
• C. band-pass signal
• D. double side-band suppressed carrier signal