SP-MIDI ringtones

SP-MIDI (Scalable Polyphony MIDI) specification was co-authored by Nokia Corporation and Beatnik Inc. This is the MIDI standard for polyphonic ringtones and multimedia messaging. As an example the Nokia 3510, 3585, 3590 and 7210 all support SP-MIDI for ringtones, game sound and messaging. The first of these polyphonic phones came out in the second half of 2002.

MIDI enables the creation of polyphonic musical compositions with differnet sounds. Polyphonic means that multiple tones can be played at the same time using instrument sounds such as guitar, drums, electronic piano, etc.

SP-MIDI is a variation on the general MIDI ringtone format and was designed to allow ringtone composers the ability to compose a single audio file that can be used across a wide range of MIDI-based mobile phones. For example, cheap mass market phones usually have a 4-note polyphonic limit and high-end phone models can have 32-note polyphony. The SP-MIDI ringtones can be used on both 4-note and 32-note mobile phones.

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