參數(shù)資料
型號(hào)： TAS3001EVM
廠商： Texas Instruments, Inc.
英文描述： TAS3001EVM(TAS3001評(píng)估板)
中文描述： TAS3001EVM（TAS3001評(píng)估板）
文件頁數(shù)： 14/72頁
文件大?。?/td> 162K
代理商： TAS3001EVM
Power-Up Sequence
3-2
3.1
Power-Up Sequence
The following is the power-up sequence for the speaker equalization board:
Insert either the MSP430 microcontroller or the
DB25
PC interface cable
into the socket provided on the board, verifying the position of pin 1.
Connect 15 V dc to the positive terminal of the power supply jack and con-
nect a ground to the negative terminal.
Turn on the power supply and verify that the board draws a current of less
than 150 mA.
Turn off the power.
Connect a 1-Vrms analog signal to the 3.5-mm stereo input jack. This input
can be provided either through a signal generator or through a CD player
or other sound generation equipment (some CD players provide up to
2 Vrms, which causes distortion).
Connect the output to amplified stereo speakers via the 3.5-mm stereo
output jack. This output can be measured by a signal analysis or played
through speakers. Alternately, connect passive speakers to the amplifier
’
s
output terminals (RCA connectors).
Turn on the power to the speaker equalization board and verify again that
it draws less than 150 mA of current after the board is initialized by the
microcontroller or by the software GUI.
Turn on the power to the input and output devices.
Depending on the selected mode of operation
—
either through the
MSP430 microcontroller or through the software GUI program and the
DB25 cable
—
introduce equalization to the input analog signal. The
instructions for the microcontroller mode of operation are described in sec-
tion 3.2, and the instructions for the software are described in
section 3.3
.
3.2
Switch Functions for Digital Equalization
When the speaker equalization board is used with an MSP430 microcontroller,
the seven onboard switches allow users to adjust the digital equalization, the
volume, the base, and the treble of the audio input signal.
The MSP430 microcontroller is preprogrammed with five different equalization
effects
—
original or no EQ, flat EQ, jazz EQ, rock EQ, and voice EQ. Since
these equalizations are created for a specific type of speaker, they must be
reprogrammed for your speakers. The microcontroller is also preprogrammed
to increase or decrease the system volume, bass, and treble by 1 dB. There
is also a preprogrammed mode that independently resets the bass and the
treble to 0 dB. Users can toggle back and forth between EQ mode and
volume/bass/treble mode by alternately depressing SW1 and SW6
simultaneously. The LED is on when the board is in EQ mode and off when the
board is in volume/bass/treble mode.
The first switch on the left performs the shift function. It switches the
microcontroller between volume/bass/treble and equalization modes.
Alternately, the shift function can be performed by pressing switches
#1 and #6.
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