| EEVblog > The AmpHour Radio Show |
| AH#10 - audio recorder battery life |
| (1/2) > >> |
| mikeselectricstuff:
Re. the issue of different battery life on WAV vs. MP3 - this is almost certainly due to the power taken for memory writes - WAV will be accessing the flash memory a lot more, and this will be where your half hour less battery life in WAV mode comes from. |
| Zero999:
Which audio recorded are you talking about? That makes sense but I wouldn't generalise: WAV is uncompressed so should be easier to encode which will take less processing power and could also save power for that reason. It probably varies depending on the recorder. |
| mikeselectricstuff:
Dave was queryiing why the spec for his audio recorder (can't remember model) showed slightly lower battery liife for WAV compared with MP3 and couldn't figure out why - the much higher bandwidth to external memory, and power draw of the memory during write could easily make up the discrepency, even after accounting for MP3 encoding. |
| Time:
flash access is costly in power. Typically, a solid state drive consumes considerably more power than a normal 7200 rpm hard drive. edit: I retract this statement. It was really only true for unoptimized first generation models. |
| EEVblog:
Yes, it could certainly be the FLASH writes. Although I would have thought there would be some buffering with either WAV or MP3, and that these would pretty much even out in the end. I can't help but think there could have been some power saved using WAV mode if that was (and it should have been) a design spec. Dave. |
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