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For playback, both models include a noise cancellation function, a voice filter which boosts only the frequencies used in the human voice to improve clarity, and Euphony Mobile surround-sound technology when the included headphones are used. As with its predecessor (DM-670), the Olympus DM-770 includes the TRESMIC System for superb stereo recordings.Building on the company’s existing DM-450 and DM-550 models, the two new devices improve audio quality thanks to a built-in three-microphone stereo capture system which combines a pair of high-sensitivity directional microphones with a central omnidirectional microphone for total coverage. Made for unconditional support, the DM‑770 provides fully‑fledged professional features for blind touch use. The device comes with an internal memory of 8192 MB, ensuring ample storage space for all recorded audio files.
The DM-670 adds an extra feature over its smaller brother with Voice Guidance, allowing hands-free control of the system's various features, along with an upgrade from 4GB to 8GB of internal storage. The better your problem and question is described, the easier it is for other Olympus owners to provide you with a good answer.The DM‑670 also ups the ante with a Voice Guidance system, 99 index marks and 8 GB of memory on board.