Qsc - Nsc8 电路图.pdf

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1、NSC8 SIGNAL CONTROLLER The QSC NSC8 Network Signal Controller is an analog signal controller for audio power amplifiers. Operated via a serial or Ethernet data link and/or direct contact closure signals, the NSC8 provides eight independent channels of level control, limiting, metering, and muting. T

2、he NSC8 will function effectively with any professional power amplifier, QSC or any other brand. FUNCTIONS SIGNAL CONTROL The NSC8 has eight identical independent analog signal control channels, each providing the following functions: Gain controlChannel mute Input and output signal level meteringCo

3、mpression/limiting (gain reduction) INPUT SELECTION Each signal control channel derives its input from any of these sources: Channel 1/left inputA common paging/aux input Channel 2/right inputAn internal tone generator Its respective input PROGRAMMABLE PRESETS All operating parameters,Preset paramet

4、ers user-defined using PC software including NSC8 AC power on/standby,Selectable via control program or with logic inputs are programmable into 16 presets TEST TONE GENERATOR An internal low-distortion sine wave generator produces 20 Hz20 kHz test signals EXTERNAL INTERFACING Direct inputscan be dri

5、ven by switches orFloating dry-contact relay outputs logic circuits RadioFans.CN 收音机爱 好者资料库 QSC NSC8 SIGNAL CONTROLLER BLOCK DIAGRAM NSC8 PROCESSING ARCHITECTURE NSC8 INPUT SWITCHING (see block diagram below) RadioFans.CN 收音机爱 好者资料库 QSC NSC8 SIGNAL CONTROLLER ARCHITECTS AND ENGINEERS SPECIFICATIONS

6、The NSC8 Network Signal Controller shall provide eight identical independent channels of analog signal control. Each channel shall provide input level, output level, and gain reduction metering, gain control, gain-reduction compression / limiting, and mute. The NSC8s input connectors shall comprise

7、eight program inputs numbered one through eight, and a ninth input designated as the common paging input. Each processing channel shall receive its input from a signal routing function that allows the channel to derive its input from the Channel 1 connector, the Channel 2 connector, the connector wh

8、ose number is the same as the number of the channel in question, the common paging input, or the internal test tone generator. For example, it shall be possible to select channel 5s input from program input connectors 1, 2, or 5, or from the common paging input, or from the internal test tone genera

9、tor. All inputs shall be electronically balanced, shall have high common-mode rejection, and shall be highly EMI-resistant. Maximum input level shall be +24 dBu. All outputs shall be unbalanced; however, an internal output balancing trans- former option shall be provided for each channel. Maximum ou

10、tput level shall be +20 dBu. Audio connectors shall be of the “Phoenix” removable barrier strip type. The gain control of each channel shall be of the voltage-controlled amplifier type, and shall be of sufficient quality to limit end-to-end total harmonic distortion of each channel to .08% from 20 H

11、z to 20 kHz. Gain control range shall be at least 127 dB, with step size of 0.5 dB. Maximum channel gain shall be +27.5 dB. Each of the eight signal channels shall include an internal socket for an optional active or passive input pre-processing module. Each socket shall provide access to its respec

12、tive input connector, to the channel signal inputs, and to the microprocessor, and shall provide DC power. The NSC8 shall provide four direct contact-closure sense inputs, and four dry-contact floating relay outputs. The NSC8 shall support the attachment of an LM8 Load Monitor to provide on-line mon

13、itoring and off-line measurement functions in the power amplifier output circuit, for the purposes of loudspeaker failure detection and system mainte- nance. All NSC8 functions shall be controlled and monitored via a serial or Ethernet data link to an IBM-compatible computer running QSC-supplied con

14、trol software. The computer connection to the NSC8 shall be implemented on its own plug-in printed circuit board, thereby allowing field upgrade to future data communication interfaces. The NSC8 shall be fully programmable, with all operating parameters under software control. Up to 16 separate para

15、m- eter sets (“presets”) shall be definable by the control software, and shall be recallable either by the control computer or via signals input to the contact-closure sense inputs. The definitions of all presets and their relationships to the contact- closure signals shall be stored in nonvolatile

16、memory within the NSC8. The NSC8 shall be packaged in a 2RU case, with no front panel controls other than power on/standby. QSC NSC8 SIGNAL CONTROLLER QSC Audio Products, Inc. 1675 MacArthur Blvd., Costa Mesa, CA 92626-1468 Ph (714) 754-6175 Fax (714) 754-6174 Email Web Rev. 7 1998 May 19 SPECIFICAT

17、IONS AUDIO CONTROL Inputs Connector typePhoenix-type detachable barrier strips TypeElectronically balanced, Nominal level+4 dBu Maximum level+23 dBu Input impedance15k differential Common-mode rejection50 dB 20 Hz20 kHz Equivalent input noise, 20-20k unweighted-95 dBu Outputs Connector TypePhoenix-t

18、ype detachable barrier strips TypeSingle-ended; balancing transformers optional Nominal level+4 dBu DIRECT CONTROL Inputs4 discrete inputs ConfigurationSingle-ended input with internal 5 VDC pullup. Open = logical “1” TTL & CMOS compatible. Sense current1.5 mA max Input voltage50 VDC max DATA INTERF

19、ACES Computer interfaceSCC-1ECC-1 Link typeRS-232 serial link10baseT Ethernet Raw data rate9600 bits per secondor 10 Mbits per sec. Connector/Cable typeDB9/null modemRJ-45/Cat. 5 GENERAL Physical Height3.5” (2RU) Width19” (standard rack mount) Depth13.5” Weight10 lbs (4.5 kg). Maximum level+20 dBu O

20、utput impedance10 Frequency response20 Hz20 kHz 0.5 dB THD+N 0 dBu out0.03% 1kHz 0.08% 20-20kHz Gain control Range-100 dB to +27.5 dB in 0.5 dB steps Channel Output Metering TypeTrue RMS in decibels Range-45 dBu to +24 dBu Compressor/ limiter Ratio2:1, 4:1, 8:1, :1 Threshold-36 dBu to +24 dBu in 0.2

21、5 dB steps Time constant11 ms, 35 ms, 112 ms Outputs4 discrete outputs ConfigurationElectromechanical relay contacts, floating Switching current2.0 A (DC), 1.0 A (AC) max Holding current1.5A (DC), 0.75A (AC) max Ground isolation70V max LM8 Expansion port ConnectorDB15 Cable length6 feet max Power Voltage110-120 VAC 50-60 Hz, 220-240 VAC 50-60 Hz, selectable ModesOn, off, standby. On/standby software- selectable.