Janet Waldo recorded the role for the film but her voice was later replaced by singer Tiffany ( though Waldo still provided the voice of a robot secretary ) .
Janet Waldo is the original voice of Judy Jetson .
Janet Waldo , the original voice of Judy Jetson , recorded the role for the film but her voice was later replaced by singer Tiffany ( though Waldo still provided the voice of a robot secretary ) .