CHAPTER 34:Sound System Configuration
1304
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
Figure 3-3: Stop Operations
START
Disable the output
module.
Disable the sound
mixing operations.
Disable the input
modules.
END
Notes:
−
While the sound system operates continuously, a stop of a sound source generation of SWFG
keeps all mixing operations of SMIX being hung up. Suspend a particular channel of SWFG only
after disabling a corresponding input channel SMIX.
−
DMA transfer needs a same operation as the case of SWFG. Before suspending DMA transfer,
disable a corresponding input channel of SMIX.
3.4.
Operation of a Sound Source
An application doesn’t need the mixing operation but only needs an operation of an output module.
In the case the sound source should be transferred to SMIX as same as the case of a mixing of multi
sound sources.
The sound system cannot directly transfer the sound source from an input module to an output module.
Because every output module doesn’t support any transfer requests for CPU and DMA.
On the other hand, every output module supports a transfer request for SMIX, that is, it is only SMIX that
can transfer the sound source to an output module.
Notes:
−
SMIX only outputs the mixed sound source of 48 kHz sampling rate. Therefore the sound system
cannot obtain the sound source with an original sampling rate even if the application doesn’t
need mixing function.
−
SMIX has the volume effect control of the mute, fade-in, and fade-out. They are quite effective for
a sound source even if the mixing operation is not necessary.
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