Generation of Sound (or Ultrasound) Waves & Resonance

Hi,

I have a question and would be grateful if you could drop me some lines for it: 

1- Is sound (or ultrasound) is ONLY generated when a structure is vibrating at its resonance frequency?   

2- If the answer to the above question is YES, is sound (or ultrasound) generated at all resonance frequencies or just some of them depending on the amplitude of the vibration. 

Thank you,

Babaei