Topological transitivity for p-adic dynamical systems

The present invention relates to a camera allowing simultaneous sound recording into which a film magazine housing a photographing film which can record sound information thus allowing simultaneous sound recording and an ordinary photographing film magazine can be selectively loaded. Also provided is a detection device to distinguish the kind of film magazines mentioned above and a linking mechanism which shifts the camera into a sound recording state in correspondence with the closing action of the magazine chamber cover of a camera only when the above mentioned detection device detects the film magazine which allows simultaneous sound recording.