The electronic pioneer revealed that the new release is a collection of reworked tracks that had previously been shelved. His recording partner Ade Fenton convinced the singer to stop erasing tracks he thought were "not good enough".
"Ade Fenton was round one day and we went out and I told him about the old stuff that I hadn't released, stuff in demo form," Numan told The Quietus. "He said to me, 'Most people have got a massive catalogue of unreleased songs on their shelves that they've never used'. Well I've not done that; if I'm working on a song and it doesn't happen or I don't think it works, I erase it. To me, it's been a sign, if that's not good enough, then don't shelve it, erase it, and start again.
"But I decided that was perhaps a bit stupid. One day I wrote a song and thought it was great, then two hours later I thought it was the worst thing I had ever done. So I realised, 25 years too late, that what I had been doing was very stupid and I had deleted any number of songs that were quite good!"
Numan added that Dead Son Rising will be followed soon after by his next 'proper' studio album Splinter.
"Dead Son Rising is now no longer a collection of songs that didn't quite make an album, it's become much more than that. The songs are radically different from the initial ideas, the songs on the shelf have just ended up being sparks for what got it all going," he explained.
"I am right in the middle of [making Splinter]. I've done quite a lot of it already. I've got lots and lots of bits."
Dead Son Rising will be released on September 12, exclusively from Numan's official website.
Gary Numan recently won the 'Inspiration Award' at the MOJO Awards 2011.
Listen to the lead single from the album, 'Dead Sun Rising', below: