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Audio Player Selection Guide
These are the factors to consider in order to select the best audio player for your particular application: Sound Quality Sound quality is mainly determined by the type of the sound file: ? 16-bit WAV: CD quality. May be an overkill for some applications. ? MP3: Near CD quality. At the highest bit rate (320 Kbps) the sound quality is almost undistinguishable from the CD quality. Good for most, if not all, applications. ? 8-bit WAV: AM radio quality. Best for voice messages with low output power. Mono or Stereo Sometimes a stereo player is used for a mono application because of the better sound quality it provides. In this case either channel can be used. Number of Trigger Inputs The trigger input is where the triggering mechanism connects to. Typical triggering mechanisms are push buttons, motion sensors, relay outputs and PLCs. Device Configuration Our players can be configured to work in many different ways, such as: ? The Direct mode plays a different file for each trigger input ? The Binary mode allows triggering of up to 128 different files ? The Sequential mode supports a different playlist to each trigger ? The Interrupt mode allows a new trigger to interrupt the current playback ? The Hold mode plays the audio for as long as the trigger is applied ? The Make mode triggers when the input makes contact closure ? The Break mode triggers when the input breaks contact closure Memory Capacity Most models support SD/SDHC cards of up to 32 GB, making the memory capacity a non-issue for most applications. Output Power The output power of our audio players is always rated as ‘continuous’ instead of ‘peak’. For example, if the rating is 15 watts then the player can output 15 watts continuously with proper heat dissipation. Whereas if the power is rated as ‘peak’ (which we don’t do) it means the output can reach the rating but only for a very short moment. BTL (Bridge Tied Load) If a stereo player is used to play a mono sound, the BTL scheme can be used to combine the two channels into one and quadruple the output power. Internal Relays Some players contain internal relays that can be turned on & off along with audio playback. The relays are typically used to control external AC or DC devices such as solenoids, lamps, motors, pumps and etc. Serial Interface Serial interface can be used to remotely control the player from a PC. However, it does not allow file upload/download.
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