QSC DSP-3' Manual descarregar pdf (Página 20)

SECTION 4: ARCHITECT’S AND ENGINEER’S SPECIFICATIONS

The Digital Signal Processor (DSP) shall provide two independent

channels of DSP for signal delivery to QSC DataPort equipped

power amplifiers. The processing shall be distributed with the DSP

module mounted directly to the rear of the power amplifiers.

Output Peak Limiter—For each audio channel, the DSP shall

provide a peak limiter that is assignable anywhere in the

signal chain and can be switched on or off. The limiter shall

provide the following adjustments:

Gain

Threshold

Attack time

Release time

High- and Low-Pass Crossover Filters—For each channel of

audio, the DSP will provide high-pass and low-pass

crossover filters that are assignable anywhere in the

audio chain. The crossover filters must be capable of

being switched in or out of the signal chain. The DSP

shall provide the following crossover responses:

Butterworth (6,12,18,24 dB per octave slope)

Bessel (6,12,18,24 dB per octave slope)

Linkwitz-Riley (12 & 24 dB per octave slope)

High- and Low-Pass Shelf Filters—For each audio channel,

the DSP shall provide high-pass and low-pass shelf

filters that are assignable anywhere in the audio chain.

The shelf filters must be capable of being switched in or

out of the signal chain. The DSP shall provide the

following shelf filter adjustments:

Variable corner frequency

Variable gain

Variable slope

Compressor-- The DSP shall provide a signal compressor that is

assignable anywhere in the signal chain. It shall have

adjustable threshold, attack time, release time, and com-

pression ratio.

Contact Closure I/O—The DSP shall provide a trigger output

usable for contact-closure (or other) purpose which shall

be CMOS & TTL signal compatible.

Power Supply—The DSP shall be provided power through its

DataPort connection to QSC amplifiers. For older amplifi-

ers or non-QSC amplifiers, a coaxial power jack will be

provided on the DSP for connection to an external power

source. Power required shall be +15 VDC at 300 mA

(max.).

Amplifier Interface—The DSP shall attach directly to the rear of

each power amplifier. The DSP’s interface to each power

amplifier Data Port shall be via an HD-15 connector. This

interface shall transmit two amplifier input audio signals

as well as all control and monitoring signals. Special

signal conditioning and grounding techniques shall be

used in this interface to ensure negligible levels of noise

and crosstalk.

Amplifier Output Monitoring—When used with QSC DataPort

amplifiers, the DSP shall provide clipping and protect

status detection at the amplifier’s output terminals.

Noise & Tone Generation-- The DSP shall provide pink and white

noise generation capability. It shall also provide for tone

generation.

General—All audio inputs and outputs shall be balanced with a

nominal input level of +4 dBu and maximum level of +21

dBu. Input connectors shall be of the “Phoenix” detach-

able terminal block type.

The Digital Signal Processor shall be the QSC DSP-3.

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