ST丰富的模拟和数字信号处理器涵盖了多种特性和和汽车音响应用 频谱的信道配置，能满足从低端到高端音频系统的汽车音频应用需求。 用户可在40多种模拟信号处理器中选择最佳解决方案，这些处理器在输入信道数量、输出信 道数量、基带音频功能（包括均衡器、动态压缩器、亚音速滤波器等）等方面有所不同。 另外，用户还可以选择带有嵌入式20位音频ADC和DAC的全数字解决方案，该解决方案基于专门针对音频应用而设计的24位DSP. 根据不同的产品，提供以下功能：
■可选差分和单端模拟输入源（AM/FM、磁带、CD/DVD、电话/Navi AUX）
■可选数字输入源，支持最普通的标准（I2S, SPDIF）
■各种输出配置
■左右声道均衡器、衰减器、音调和音量控制、图示补偿器、亚音速滤波器、动态压缩器等等
■双声道媒体播放
■FM立体声解码器

TDA7303
Description
The TDA7303 is a volume, tone (bass and treble) balance (left/right) and fader (front/rear) processor for quality audio applications in car radio, Hi-Fi and portable systems.
Selectable input gain and external loudness function are provided. Control is accomplished by serial I2C bus microprocessor interface.
The AC signal setting is obtained by resistor networks and switches combined with operational amplifiers.
Thanks to the used bipolar/CMOS technology, low distortion, low noise and low DC stepping are obtained.

Key Features
Input multiplexer:
3 stereo inputs
Selectable input gain for optimal adaptation to different sources
Volume control in 1.25 dB steps
Loudness function
Treble and bass controL
Four speaker attenuators:
4 independent speakers control in 1.25d B steps for balance and fader facilities
Independent mute function
All functions programmable via serial I2C bus

TDA7342
Description
The audioprocessor TDA7342 is an upgrade of the TDA731X audioprocessor family.
Due to a highly linear signal processing, using CMOS-switching techniques instead of standard bipolar multipliers, very low distortion and very low noise are obtained. Several new features like softmute, and zero-crossing mute are implemented. The soft Mute function can be activated in two ways:
Via serial bus (Mute byte, bit D0)
Directly on pin 21 through an I/O line of the microcontroller
Very low DC stepping is obtained by use of a BICMOS technology.

Key Features
Input multiplexer
Two stereo and one mono inputs
One quasi differential input
Selectable input gain for optimal adaptation to different sources
Fully programmable loudness function
Volume control in 0.3dB steps including gain up to 20dB
Zero crossing mute, soft mute and direct mute
Bass and treble control
Four speaker attenuators
Four independent speakers control in 1.25dB steps for balance and fader facilities
Independent mute function
All functions programmable via serial I2C bus

TDA7342EQ2N
Description
The audioprocessor TDA7342EQ2N is an upgrade of the TDA731X audioprocessor family.
Due to a highly linear signal processing, using CMOS-switching techniques instead of standard bipolar multipliers, very low distortion and very low noise are obtained. Several new features like softmute, and zero-crossing mute are implemented. The soft Mute function can be activated in two ways:
Via serial bus (Mute byte, bit D0)
Directly on pin 21 through an I/O line of the microcontroller
Very low DC stepping is obtained by use of a BICMOS technology.

Key Features
Input multiplexer
Two stereo and one mono inputs
One quasi differential input
Selectable input gain for optimal adaptation to different sources
Fully programmable loudness function
Volume control in 0.3dB steps including gain up to 20dB
Zero crossing mute, soft mute and direct mute
Bass and treble control
Four speaker attenuators
Four independent speakers control in 1.25dB steps for balance and fader facilities
Independent mute function
All functions programmable via serial I2C bus