参数资料
型号: TSH512CFT
厂商: STMICROELECTRONICS
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP44
封装: 10 X 10 MM, ROHS COMPLIANT, TQFP-44
文件页数: 8/31页
文件大小: 1350K
代理商: TSH512CFT
Application information
TSH512
16/31
Doc ID 8120 Rev 7
4.2
Sub-carrier generator application: voice-operated wireless
camera
Thanks to its operating frequency, the TSH512 offers the possibility of generating usual
audio sub-carriers for video applications (Figure 23). The camera can be voice-activated
using the VOX-MUTE output of the TSH512. The TSH512 also provides bias, amplification,
ALC for the electret microphone.
Figure 23.
Typical block diagram for audio sub-carrier generator
4.3
Multimedia application
4.3.1
Headset side
The TSH512 is used in mono mode to transmit the signal of the electret condenser
microphone of the headset. The circuit is supplied by batteries and the VOX function
switches off the output stages to save energy. The usual working frequency is 1.7 MHz for
infrared mono operation.
TSH512
LNA + ALC
MIC. BIAS
TX2
VOX
SBY
buffer1
buffer2
Vcc
6 or 6.5 MHz
filter
Electret Condenser
Microphone
Miniature camera
FM 2.4 GHz
transmitter
6 or 6.5 MHz
Audio sub-carrier
Video
VOX-MUTE
Stand-By
S
Sub-carrier
Stand-By
TX1
TSH512
LNA + ALC
MIC. BIAS
TX2
VOX
SBY
buffer1
buffer2
Vcc
6 or 6.5 MHz
filter
Electret Condenser
Microphone
Miniature camera
FM 2.4 GHz
transmitter
6 or 6.5 MHz
Audio sub-carrier
Video
VOX-MUTE
Stand-By
S
Sub-carrier
Stand-By
TX1
相关PDF资料
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