Comparison Olympus DM-720 vs Olympus WS-852

— SD. One of the formats used in audio, video, computer technology, etc.; Almost every modern laptop has an SD card reader. However, the dimensions of such cards (32x24 mm) are relatively large for portable equipment, and therefore they are used relatively rarely in voice recorders. And they are often represented by more modern SDHC or SDXC cards with increased memory capacity and support for the high-speed UHS bus. Accordingly, SDXC support guarantees comfortable work with SDHC and SD, and SDHC support will not fail when connecting SD cards.

— miniSD. A slightly reduced (up to 22x20 mm) variation of the SD standard, otherwise completely identical to it (up to compatibility with SD-card readers when using simple adapters). It is rare due to the widespread use of even smaller microSDs.

— microSD. The most compact version of SD memory cards to date, have a size of 15x11 mm and a capacity of up to 4 GB. Due to their small size, they are widely used in portable electronics: in fact, they are the standard for mobile phones, and are also widely used in voice recorders. Like miniSD, they can be read by original SD card readers using an adapter.

— microSD HC. The second generation of the microSD standard; characterized by increased capacity, reaching 32 GB. In a voice recorder (and in general any card reader), ordinary microSD cards can also be used for microSD HC cards, but it is impossible to do the opposite — the card will not be read.

...— CompactFlash (hereinafter referred to as CF). One of the first memory card standards, it is still used due to its decent data transfer speed and impressive volumes (up to 128 GB). However, the dimensions of these cards are no less impressive — 42x36 mm. As a result, they are poorly suited for pocket format equipment and are rarely used in voice recorders — mainly in advanced models, where the priority is functionality and recording quality, rather than compactness. If the recorder is designed for CF Type II cards, it can work with all types of CF, and devices under Type I are only compatible with this type.

— memorystick. A proprietary standard developed by Sony and used primarily in its devices. It has a number of variations that differ in dimensions, volume and compatibility, and therefore, when buying a card for such a voice recorder, it is worth clarifying the specific MemoryStick specification used. The standard is rather poorly spread: firstly, because of its closeness (that's why, by the way, full compliance with it is guaranteed only in original Sony cards), and secondly, because of the high price of the cards themselves.

xD-Picture. Cards originally made by Olympus and Fujifilm for their digital cameras. The advantages of such cards are high reliability and compactness (20x25 mm), the disadvantages are high cost and relatively small volumes (up to 2 GB). As a result, dictaphones for xD-Picture are very rare.

— Built-in. In this case, it is understood that the recorder can only use its own built-in microphone when recording; Connectors for connecting an external microphone are not provided. This reduces the size of the device, simplifies the design and eliminates the confusion with wires. At the same time, built-in microphones usually provide slightly worse recording quality than external ones.

— Built-in / external. Such a voice recorder can record both from its own built-in microphone, and from an external one connected to the appropriate connector. This expands the possibilities of using the device: when compactness and maximum convenience are important, you can use the built-in microphone, and if the high quality of the recorded sound is critical, an external one is connected, which usually provides noticeably better volume and intelligibility. An external microphone is usually not included; on the other hand, it gives you the opportunity to choose a model for specific needs.

— External. Dictaphones without a built-in microphone with the ability to connect an external one. This allows you to choose the right type of device for specific needs and change them as needed. Refers to professional activity.

Separate input for connecting an external microphone. See "Connecting an External Microphone" for details.

— MP3. The most common digital audio format today, supported by the vast majority of digital audio devices, regardless of size. Provides medium quality compression and medium sound quality. When saved, it compresses information with loss of quality, but these losses are almost imperceptible to the ear, especially when recording speech from a non-specialized microphone.

— WMA. Format developed by Microsoft. It surpasses MP3 in terms of data compression capabilities, providing good quality at a low bitrate and, as a result, a small file size, but is less popular, in particular, due to sensitivity to errors in the file. At the same time, it is very common in digital audio equipment, it can be reproduced on computers without problems (it is a standard audio format of Windows OS).

— WAV. Technically, it is not a format, but a "container" into which you can "pack" sound processed by any codec; however, it is most commonly used to store uncompressed PCM audio. Thus, WAV provides the best sound quality comparable to Audio CD, however, such files, usually, take up much more space than in the above-mentioned formats. It also plays on a computer without any problems.

— Own. Some voice recorder models record audio in their own format, which is different from common standards. Technically, a proprietary format can provide a good r...atio of recording quality to file size, however, listening to such materials often causes inconvenience: you either need to listen to it on the recorder itself, or install a special player or codecs on your computer, or convert it into one of the "generally understood" formats with possible quality loss.

The higher the amount of data per unit of time that is used to transmit the audio stream, the higher the quality of the MP3 recording is provided. So, the base bitrate of 32 Kbps means encoding one second of sound using 32 thousand bits of information - it is used only for speech transmission. Much more common in portable audio recording devices is the recording quality of 128 Kbps, 192 Kbps and 256 Kbps. The maximum possible bits rate for the MP3 format is 320 Kbps. The pursuit of the highest quality of sound recording makes sense for advanced models of recorders; for a conditional voice recorder for recording lectures, the basic bitrate parameters will be quite enough. Also keep in mind that the quality of sound recording affects the size of the resulting files and the duration of the voice recorder.

Uncompressed WAV provides the best sound quality among common Hi-Res audio formats. Its sampling rate is usually 96 or 192 kHz with a bit depth of 24 bits. The format is used for "clean" sound recording with maximum detail of the scene.

The maximum continuous recording time for the voice recorder. It depends primarily on the amount of memory (see "Built-in memory", "Memory card slot"), it is also directly related to the recording quality: the higher the quality, the more space the material occupies and the shorter the maximum recording time. In this regard, manufacturers usually indicate in the specifications the maximum possible recording time, that is, the recording time with minimum quality; with higher quality and time will be less.

The maximum number of folders that can be created in the recorder's memory to store recorded materials. This allows you to organize the materials and makes it easier to find the right record: for example, in journalistic work, the material on each individual topic can be stored in the appropriate folder. Many voice recorders allow you to change the folder used for recording on the fly, literally at the touch of a button.

The range of sound frequencies that the recorder is capable of perceiving and recording. A person is able to hear sound on average from 16 Hz to 20 kHz, but the range of the actual human voice is much narrower — approximately 100-3500 Hz. Therefore, if you plan to use a voice recorder to record speech, these frequencies will be enough. If the purpose of the recorder is not limited to this, you should pay attention to models with a wider range — and in this case, the wider it is, the fuller and richer the recording will be.