User manual MACKIE SP-DSP1 DATASHEET

[. . . ] As the ambient noise level of the room changes, the gain of the program material automatically adjusts to compensate for those changes. The SP-DSP1 is designed to be controlled with the SP-ControlTM application running under the PalmTM OS. The SP-Control application is included on a 3. 5" floppy disk, and it can also be downloaded from the Mackie Industrial website (www. mackieindustrial. com). [. . . ] The Attack Time setting determines the rate at which the program level increases. The higher the Attack Time setting, the faster the program level increases once the noise level crosses the Noise Threshold. The Release Time setting determines the rate at which the program level decreases. The higher the Release Time setting, the faster the program level decreases once the noise level drops below the Noise Threshold. The SP-DSP1 can store up to ten preset configurations for various functions or applications. The Auto Calibration procedure computes the Room Transfer Function (RTF) and prevents runaway gain. Features Adds ambient noise sensing capability to the SP1200 and SP2400 Program Controller/Amplifier Adaptive digital filtering analyzes the signal at the ambient microphone and determines the amount of ambient noise in a room Automatically adjusts the system gain according to the ambient noise level SP-ControlTM PalmTM OS application included for remote control Adjustable parameters on the PalmTM include minimum gain, gain range, noise threshold, noise range, attack time, and release time Bargraph metering on the PalmTM monitors program input level, microphone input level, program gain, and program output level Auto-calibration function Upload and download capability from EEPROM to SP-Control application SP-DSP1 DSP SP-DSP1 SP-DSP1 DSP SP-DSP1 Automatic Level Control for the SP1200/SP2400 Screen Shots of SP-Control PalmTM Application Architects' and Engineers' Specifications The SP-DSP1 shall consist of a DSP card and a power supply expansion card designed to be installed in the SP1200 and SP2400 Program Controller/Amplifier. It shall provide automatic level control for the program signal, dependent on the ambient noise level. It shall use a proprietary ambient noise level sensor algorithm derived from a Normalized Least Mean Square Adaptive Filter (nLMS). The SP-Control software shall provide a user interface and provide control over the digital signal processing parameters in the SP-DSP1, consisting of the following: A Minimum Gain control shall provide a gain range from ­40 dB to 0 dB. The Minimum Gain setting shall determine the normal operating level of the system prior to the action of the Automatic Level Control. The Gain Range setting shall determine the maximum level of the system after the Automatic Level Control has been activated. A Noise Threshold control shall provide a Threshold range from ­80 dB to 0 dB. The Noise Threshold setting shall determine the noise level above which the Automatic Level Control begins to operate. A Noise Range control shall provide a noise range from +1 dB to +60 dB. The Noise Range setting shall determine the rate the program level gain changes as a function of the change in ambient noise level determined by the ambient noise sensor algorithm. An Attack Time setting shall provide an attack time range from 1 second to 300 seconds. The Attack Time setting shall determine the time for the program gain to increase by 40 dB. [. . . ] An Auto Calibration function shall be provided to compute the coefficients for the Room Transfer Function (RTF), and optimize the algorithm to reject the music signal and more accurately measure the ambient noise. The Automatic Level Control shall be a model SP-DSP1 manufactured by Mackie Industrial. Electronic files for this product available at: www. mackieindustrial. com This Specification Sheet SPDSP1. PDF www. mackieindustrial. com 16220 Wood-Red Rd. NE, Woodinville, WA 98072 USA 888. 337. 7404, fax 425. 487. 4337, industrial@mackie. com UK +44. 1268. 571. 212, fax +44. 1268. 570. 809, info@rcf-uk. com ITALY +39. 0522. 354. 111, fax +39. 0522. 926. 208, industrial@rcf. it FRANCE +33. 3. 8546. 9160, fax +33. 3. 8546. 9161, rcf. commercial@wanadoo. fr GERMANY +49. 2572. 96042. 0, fax +49. 2572. 96042. 10, industrial@mackie. de Mackie Designs continually engages in research related to product improvement. [. . . ]