Photodetection device and ranging system

A ranging system comprising:

• a light emitting device including
• a first light emitting section that emits a plurality of first light pulse signals at a first time interval, and
• a second light emitting section that emits a plurality of second light pulse signals at a second time interval;
• a light receiving section that receives a first reflected light pulse signal in which the first light pulse signal is reflected by an object within a first time range, and receives a second reflected light pulse signal in which the second light pulse signal emitted at a second time interval different from the first time interval is reflected by the object within a second time range different from the first time range;
• and
• a packet generator that generates ranging data having two or more histograms including a first histogram generated on a basis of the first reflected light pulse signal and a second histogram generated on a basis of the second reflected light pulse signal in units of frames,
• wherein the ranging data includes a start section, a plurality of packets, and an end section,
• the start section includes an identifier indicating a head of a frame and a number of two or more time intervals including the first time interval and the second time interval,
• the packet includes a header including a bin count of a histogram corresponding among the two or more histograms, histogram data constituting the histogram corresponding, and a footer including end information of the histogram corresponding, and
• the end section includes an identifier indicating an end of the frame.