參數(shù)資料
型號(hào)： STV8237
廠商： 意法半導(dǎo)體
英文描述： Digital Audio Decoder/Processor for A2 and NICAM Television/Video Recorders
中文描述： 數(shù)字音頻解碼器/處理器為A2和麗音電視/錄像機(jī)
文件頁數(shù)： 37/149頁
文件大?。?/td> 2775K
代理商： STV8237
37/149
STV82x7
Dedicated Digital Signal Processor (DSP)
●
In
Independent mode
, the volume for the Left and Right channels for Loudspeakers or
Headphone is controlled independently.
4.14
Soft Mute Control
The Digital Soft Mute is applied smoothly (20 ms for 120 dB range) to avoid any switch noise on
output. It is available on all output channels pairs:
●
S/PDIF channel (Left/Right)
●
SCART channels (Left/Right)
●
Loudspeakers channels (Left/Right)
●
Center
●
Subwoofer
●
Headphone/Surround channels (Left/Right)
Another soft mute (analog) is also available on each DAC output.
4.15
Beeper
The beeper is used to generate a tone on the Loudspeakers or/and Headphone outputs. The
beeper sound (square wave) is added to the audio signal which is attenuated by 20 dB. The beep
sound amplitude includes a smooth attack and decay to avoid any parasitic noise when starting and
stopping.
It can be used for various applications such as beep sounds for remote control, alarm clock or other
features.
The Beeper operates in one of two modes:
●
Pulse mode
(beep applications): A tone with a programmable short duration (0.1, 0.25, 0.5
and 1.0 s) is generated. Afterwards, the beeper is automatically disabled and the output is
switched back to the audio signal, see
Figure 21
.
●
Continuous mode
(alarm application): A tone with a programmable long duration is
generated. Its start and stop controls must be programmed by I2C, see
Figure 22
.
The Beeper function is enabled by setting the BEEPER_ON bit in register
BEEPER_ON
.
Beeper parameters are controlled in register
BEEPER_MODE
.
The beeper tone level and frequency are programmed in register
BEEPER_FREQ_VOL
. The level
(or volume) ranges between 0 dB and -93 dB in steps of 3 dB and the tone frequency ranges
between 62.2 Hz and 8 kHz in steps of 1 octave.
Figure 20: Differential Balance
O
100%
Mute
200h
1FFh
I2C Control (10 bits)
000h
Rgh Channe
LetChanne
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