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SGH-P408 Circuit Description
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4) Audio
AOUTAP from CSP1093 is connected to the main speaker. AOUTAN is
connected to the speaker via audio-amp. AOUTBN and AOUTBP are connected
to the ear-mic speaker via ear-jack. MICIN and MICOUT are connected to the
main MIC. And AUXIN and AUXOUT are connected to the Ear-mic.
YMU762MA3 is a LSI for portable telephone that is capable of playing high
quality music by utilizing FM synthesizer and ADPCM decorder that are
included in this device.
As a synthesis, YMU762MA3 is equipped 16 voices with differenttones. Since
the device is capable of simultaneously generating up to synchronous with the
play of the FM synthesizer, various sampled voices can be used as sound
effects.
Since the play data of YMU762MA3 are interpreted at anytime through FIFO,
the length of the data(playing period) is not limited, so the device can
flexiblysupport application such as incoming call melody music distribution
service. The hardware sequencer built in this device allows playing of the
complex music without giving excessive load to the CPU of the portable
telephones. Moreover, the registers of the FM synthesizer can be operated
directly for real time sound generation, allowing, for example, utilization of
various sound effects when using the game software installed in the portable
telephone.
YMU759 includes a speaker amplifier with high ripple removal rate whose
maximum output is 550mW (SPVDD=3.6V). The device is also equipped with
conventional function including a vibartor and a circuit for controlling LEDs
synchornous with music.
For the headphone, it is provided with a stereophonic output terminal.
For the purpose of enabling YMU762MA3 to demonstarte its full capablities,
Yamaha purpose to use "SMAF:Synthetic music Mobile Application Format" as a
data distribution format that is compatible wiht multimedia. Since the SMAF
takes a structure that sets importance on the synchronization between sound
and images, various contents can be written into it including incoming call
melody with words that can be used for traning karaoke, and commercial
channel that combines texts, images and sounds, and others. The hardware
sequencer of YMU762MA3 directly interprets and plays blocks relevant to
systhesis (playing music and reproducing ADPCM with FM synthesizer) that are
included in data distributed in SMAF.
