AD1941: SigmaDSPTM Multichannel 28-Bit Audio Processor
AD1940/AD1941 是一款完整的28位、单芯片、多通道音频DSP，用于扬声器均衡、多频段压缩/限幅、延迟补偿和图像增强。这些算法可用来弥补扬声器、功放和听音环境的实际限制，从而大幅改善音质。AD1941所用的信号处理技术堪比高端演播室设备所用的技术。大部分处理均采用完全56位双精度模式完成，低电平信号性能极佳，并且无极限环或空闲音。压缩器/限幅器采用高端广播压缩器常用的先进多断点算法。
AD1940/AD1941 是一款完全可编程的DSP。借助方便易用的软件，用户可以利用所提供的双二阶滤波器、动态处理器和环绕声处理器等模块，以图形方式配置自定义信号处理流程。通过功能全面的控制端口可以实现免点击参数更新，而且可以在算法流程的任意一点执行回读。AD1940/AD1941 的数字输入和输出端口可以在双通道或TDM模式下与ADC和DAC实现无缝连接，并且可以与AD1940/AD1941 等数字放大器功率级相连。在TDM模式下，AD1940/AD1941 可以输入8通道或16通道串行数据，并且可以输出8通道或16通道串行数据。输入和输出端口配置可以分别独立设置。 AD1940 通过一个四线式SPI端口进行控制。AD1941通过一个二线式I2C端口进行控制。除了控制接口不同外,这两个器件的其它功能都是相同的。
The AD1941 is a complete 28-bit, single-chip, multichannel audio DSP for speaker equalization, multiband compression/ limiting, delay compensation, and image enhancement. These algorithms can be used to compensate for the real-world limitations of speakers, amplifiers, and listening environments, resulting in a dramatic improvement of perceived audio quality.The signal processing used in the AD1941 is comparable to that found in high-end studio equipment. Most of the processing is done in full 56-bit double-precision mode, resulting in very good low-level signal performance and the absence of limit cycles or idle tones. The compressor/limiter uses a sophisticated multiple-breakpoint algorithm often found in high-end broadcast compressors.
The AD1941 is a fully-programmable DSP. Easy-to-use software allows the user to graphically configure a custom signal processing flow with provided blocks such as biquad filters, dynamics processors, and surround sound processors. An extensive control port allows click-free parameter updates, along with read-back capability from any point in the algorithm flow.The AD1941’s digital input and output ports allow glueless connection to ADCs and DACs in either 2-channel or TDM mode, and to digital amplifier power stages such as the AD1991. When in TDM mode, the AD1941 can input 8 or 16 channels of serial data, and can output either 8 or 16 channels of serial data. The input and output port configurations can be individually set.
AD1941 特点
- 16通道数字音频处理器
- 接受最高192 kHz的采样速率
- 28位 x 28位乘法器，内置完全56位累加器
- 完全可编程的程序RAM，用于定制程序下载
- 利用参数RAM可以完全控制1024个参数
- I2C控制端口具有安全加载特性，可以实现透明参数更新，以及对模式和存储器传输的完全控制
- Target/Slew RAM，实现免点击音量控制和动态参数更新
- 欲了解更多特性，请参考数据手册
- 16-channel digital audio processor
- Accepts sample rates up to 192 kHz
- 28-bit x 28-bit multiplier with full 56-bit accumulator
- Fully-programmable program RAM for custom program download
- Parameter RAM allows complete control of 1024 parameters
- I^2C control port features safeload for transparent parameter updates and complete mode and memory transfer control
- Hardware-accelerated DSP core
- See data sheet for additional features
AD1941 技术指标
- Instructions/Cycles: 1536
- DAC DNR (dB): n/a
- DAC THD+N @ 1 kHz (-3dB): n/a
- Digital I/O Channels: 16/16
- Analog I/O Channels: 0/0
- Product Description: Multichannel 28-/56-bit audio processor with 2-wire I2C control interface
AD1941 应用领域
- 汽车音响系统
- 数字电视
- 家庭影院系统(杜比数字/DTS 后置处理器)
- 多通道音频系统
- 迷你型立体声系统
- 多媒体音频
- 数字扬声器分频器
- 乐器
- 座椅音响系统（飞机/长途汽车）
- Automotive sound systems
- Mini-component stereos
- Home theater systems (AC-3 postprocessor)
- Multichannel audio systems
- Multimedia audio
- Digital speaker crossover
- Musical instruments
- In-seat sound systems (aircrafts/motor coaches)
AD1941 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD1941YSTZ | 量产 | 48 ld LQFP | 48 | 汽车级 |
| AD1941YSTZRL | 量产 | 48 ld LQFP | 48 | 汽车级 |