Canadian folk singer-songwriter Joni Mitchell, who was hospitalised on Wednesday, was "in good spirits" after being found unconscious at her home, her official website said.

A statement on her website said the 71-year-old singer-songwriter, one of the stars of the Woodstock era, had regained consciousness while being transported by ambulance to a Los Angeles-area hospital.

Mitchell was undergoing medical testing in the hospital's intensive care unit but was "awake and in good spirits", the statement said.

Earlier, the official Twitter account for her website jonimitchell.com tweeted on Wednesday morning: "Joni has been hospitalised. We are awaiting official word on her condition and will post it here as soon as we know."

According to TMZ, prior to being sent to hospital, Mitchell was found by paramedics after an emergency call from her house.

Los Angeles fire officials said paramedics answered an afternoon 911 call in Bel Air, where Mitchell lives, and took a patient to the hospital but they did not give her identity.

The multiple Grammy award winner, famous for hit songs like Both Sides Now and Big Yellow Taxi, last released an album, titled Shine, in 2007.

(additional reporting by Reuters)