buzzer to buzzer this experiment certain frequency square wave can buzzer sounded a corresponding pitch. The experiment by designing a state machine and the buzzer sounded a divider so that the "multi-microphone to the shuttle Rasi more" tone.

蜂鸣器
......\buzzer
......\......\buzzer.qpf
......\......\buzzer.qsf
......\......\buzzer.qws
......\......\buzzer.vhd
......\......\cmp_state.ini
......\......\db
......\......\..\buzzer.db_info
......\......\..\buzzer.eco.cdb
......\......\..\buzzer.sld_design_entry.sci
......\buzzer.asm.rpt
......\buzzer.cdf
......\buzzer.done
......\buzzer.fit.eqn
......\buzzer.fit.rpt
......\buzzer.fit.summary
......\buzzer.flow.rpt
......\buzzer.map.eqn
......\buzzer.map.rpt
......\buzzer.map.summary
......\buzzer.pin
......\buzzer.pof
......\buzzer.qpf
......\buzzer.qsf
......\buzzer.qws
......\buzzer.tan.rpt
......\buzzer.tan.summary
......\buzzer.vhd
......\buzzer.vhd.bak
......\cmp_state.ini
......\db
......\..\add_sub_7ph.tdf
......\..\buzzer.asm.qmsg
......\..\buzzer.cbx.xml
......\..\buzzer.cmp.cdb
......\..\buzzer.cmp.hdb
......\..\buzzer.cmp.rdb
......\..\buzzer.cmp.tdb
......\..\buzzer.cmp0.ddb
......\..\buzzer.db_info
......\..\buzzer.eco.cdb
......\..\buzzer.fit.qmsg
......\..\buzzer.hier_info
......\..\buzzer.hif
......\..\buzzer.map.cdb
......\..\buzzer.map.hdb
......\..\buzzer.map.qmsg
......\..\buzzer.pre_map.cdb
......\..\buzzer.pre_map.hdb
......\..\buzzer.psp
......\..\buzzer.rtlv.hdb
......\..\buzzer.rtlv_sg.cdb
......\..\buzzer.rtlv_sg_swap.cdb
......\..\buzzer.sgdiff.cdb
......\..\buzzer.sgdiff.hdb
......\..\buzzer.signalprobe.cdb
......\..\buzzer.sld_design_entry.sci
......\..\buzzer.sld_design_entry_dsc.sci
......\..\buzzer.syn_hier_info
......\..\buzzer.tan.qmsg
......\..\buzzer_cmp.qrpt

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