TA1343N Datasheet, PDF (9/26 Pages) Toshiba Semiconductor – TV SOUND PROCESSOR

TA1343N
· ALS switch (sub address 03 (h)/b6), ALS start point (sub address 03 (h)/b5 to b4)
Gain of Wch is large. So output signals of Wch is distort easily when the input signals are large. ALS
(Automatic Level Suppresser) suppresses Wch signal level under ALS start point, and reduces the
distortion in large signals input condition.
Set the bit of sub address 03 (h)/b6 to 0 (b), ALS is inactive. Set the bit 1 to (b), ALS is active.
Switch on default data is 0 (b).
The bits of 03 (h)/b5 to b4 set ALS start point. Set the bits to 00 (b), ALS start point is 220 mVrms. Set
the bits to 01 (b), ALS start point is 380 mVrms. Set the bits to 10 (b), ALS start point is 525 mVrms. And
set the bits to 11 (b), ALS start point is 770 mVrms.
Switch on default data is 00 (b).
· Surround mode 1 (sub address 06 (h)/b6), Surround mode 2 (sub address 06 (h)/b7)
Surround mode 1 is selection of phase shift value of the surround circuit. Set the bit to 0 (b), L-R signal is
shifted by 1 phase shift stage. Set the bit to 1 (b), L-R signal is shifted by 4 phase shift stages.
Surround mode 2 is selected by condition of the input signal. When input signal is stereo, surround mode
2 must be set to 0 (b). When input signal is monaural, surround mode 2 must be set to 1 (b) (pseudo stereo
mode).
Recommend setting surround 1 to 1 (b) when pseudo stereo mode is selected.
· Mute 1 (sub address 07 (h)/b0), Mute 2 (sub address 07 (h)/b1)
When Mute 1 is active, all outputs are muted.
Set the bit to 0 (b), mute 1 is inactive. Set the bit to 1 (b), Mute 1 is active.
Switch on default data is 0 (b).
When Mute 2 is active, only Wch output is muted. Set the bit to 0 (b), Mute 2 is inactive. Set the bit to 1
(b), Mute 2 is active.
Switch on default data is 0 (b).
· Woofer LPF fo (sub address 07 (h)/b5 to b4)
These bits set cut off frequency (fo) of the low pass filter for Wch.
Set the bits to 00 (b), fo is 100 Hz (-3dB point). Set the bits to 01 (b), fo is 125 Hz. Set the bits to 10 (b), fo
is 170 Hz. Set the bits to 11 (b), fo is 210 Hz.
Switch on default data is 01 (h).
· Woofer LPF defeat (sub address 07 (h)/b3)
Set the bit to 1 (b), Woofer LPF is defeated.
This function is for device test. So, this bit must be set to 0 (b).
Switch on default data is 0 (b).
· Bass boost switch (sub address 07 (h)/b7)
Bass boost function is adding Wch signal to main channel signals. It can boost low frequency signal
without woofer output.
Set the bit 0 (b), Bass boost is inactive. Set the bit 1 (b), bass boost is active.
Switch on default data is 0 (b).
Purchase of TOSHIBA I²C components conveys a license under the Philips I²C Patent Rights to use
these components in an I²C system, provided that the system conforms to the I²C Standard Specification
as define by Philips.
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2002-02-12