www.ti.com

3D Effect Options

3D Effect Options

By implementing a 3D effect in this option box, the PCM3793A is enabled to provide 3D sound to the headphone and speaker outputs with low power consumption during either ADC or DAC operation. Check the 3D effect, then select an Effect type and an Efficiency drop-down menu to obtain the desired 3D enhancement.

Effect type means the selection of a band-pass filter (BPF); the BPF filters the sound, and enables a high percentage of heavy 3D enhancements to be applied to the signal.

Effect type and efficiency are controlled through the use of checkboxes.

Notch Filter 1 Coefficient, Notch Filter 2 Coefficient Options

In some applications, incoming noise such as motor control noise, CCD noise and other mechanical noise may not be negligible. The PCM3793A provides a very useful function to reduce such interference with the notch filter function.

When the checkbox of Notch Filter 1 Coefficient or Notch Filter 2 Coefficient is checked, coefficient a1 and a2 of the notch filter can be programmed at each edit box.

Load the values of fc, fb and fS into the Filter Calculator group box.

Click Apply to Filter 1 or Apply to Filter 2. The calculated coefficient will then appear in the a1 and a2 edit box.

Finally, click the Update button for each Notch filter coefficient. To complete the notch filter operation, the Update button must be clicked.

Note that Update step is required each time new or different parameters are loaded to the dialog box.

Follow these steps to update the notch filter coefficient:

Step 1. Click the checkbox of Notch Filter 1 Coefficient or Notch Filter 2 Coefficient. Step 2. Input the parameter values fc, fb and fS.

Step 3. Click Apply to Filter 1 or Apply to Filter 2.

Step 4. Update for each notch filter coefficient.

Each coefficient is calculated using the following equations.

a1 = –(1 + a2)cos(ωo)

a2 = [1 – tan(ωb/2)] / [1 + tan(ωb/2)]

where:

∙fS = sampling frequency

∙fc = center frequency

∙fb = bandwidth

∙ωo = 2πfc/fS represents the angular center frequency

∙ωb = 2πfb/fS is the parameter to adjust bandwidth

Here are several example coefficient calculations using Equation 3-1and Equation 3-2. These measurements are also shown in Figure 3-16.

Given: fS = 16kHz, fc = 0.5kHz, fb = 0.2kHz

a2 = 0.924390492 (converted decimal to hex: 3B29h)

a1 = –1.887413868 (converted decimal to hex: 8735h)

a2: F[215:208] = 3Bh, F[207:200] = 29h

a1: F[115:108] = 87h, F[107:100] = 35h

32

Set-Up Guide

SBAU127 –July 2007

Submit Documentation Feedback

Page 31 Page 33
Page 32
Image 32
Texas Instruments DEM-DAI3793A manual 3D Effect Options, Click Apply to Filter 1 or Apply to Filter
Page 31 Page 33

DEM-DAI3793A specifications

The Texas Instruments DEM-DAI3793A is a versatile digital-to-analog converter (DAC) evaluation module designed for assessing the performance and capabilities of TI's DACs in various applications. This module features the high-performance DAC3793, which is widely recognized for its precision and flexibility, making it an ideal choice for audio, industrial automation, and communication systems.

One of the standout features of the DEM-DAI3793A is its ability to support a 16-bit resolution. This high resolution enables the module to provide fine granularity in signal representation, ensuring that even the most subtle changes in the input signal are accurately reflected in the output. The DAC3793 also boasts a high sampling rate, which is crucial for applications that require rapid signal processing and real-time data conversion.

The module incorporates advanced technologies such as dynamic element matching and integrated circuitry to minimize distortion and noise. These technologies are crucial for achieving high-fidelity audio playback and improving overall system performance. Additionally, the DEM-DAI3793A is designed to minimize power consumption while maintaining exceptional performance levels, making it suitable for battery-operated devices and energy-conscious applications.

Another significant characteristic of the DEM-DAI3793A is its ease of integration with various development environments. The evaluation module supports both hardware and software interfacing, allowing engineers to quickly prototype and test their designs. It comes equipped with a USB interface for seamless connectivity with computers, along with supporting software tools that facilitate the configuration and testing of the DAC's functionalities.

The DEM-DAI3793A is also designed with a robust set of output options, including differential and single-ended outputs. This flexibility allows for compatibility with a wide range of amplification and filtering circuits. Furthermore, the evaluation module is equipped with convenient power supply options, enabling it to operate in various settings without the need for extensive modifications.

In conclusion, the Texas Instruments DEM-DAI3793A is an exceptional evaluation module that showcases the capabilities of the DAC3793. With its high resolution, advanced technologies, ease of integration, and flexible output options, it serves as an indispensable tool for engineers and developers working on high-performance audio and data processing applications.
Top Page Image Contents