Model 740 Spectral Processor User`s Manual

There are 3 notable aspects to this processing stage: x x x

The gain elements - fixed and sliding bands

How these elements are combined

A multi-level approach

The Gain Elements - fixed bands and sliding bands

The processing stage actually contains eight processors that partition the incoming signal in terms of both frequency and level. These processors work in pairs of one fixed-band stage and one sliding-band stage. The sliding bands provide a constant amount of boost in a frequency band that can slide up and down the audio spectrum while the fixed bands provide a variable amount of boost in bands which are fixed in frequency. The optimum boost for some signals may be provided by a sliding-band processor, whereas for another signal a fixed-band processor may be better.

Combining Fixed and Sliding Bands

The key to the processing is how these bands work together; their outputs are combined in a unique way to gain the benefits of both approaches without the drawbacks of either. For any part of the spectrum the output of the band that provides the most boost is used, resulting in great flexibility in boosting low-level elements.

Multi-level Processing

There are four of these fixed-band/sliding-band pairs, two for high frequencies and two for low frequencies. Within each frequency range the pairs of bands are arranged so that one pair boosts low-level signals, reducing its gain to unity at medium levels where the second pair takes over, providing boost for low-level and medium-level signals gradually reducing its gain to unity at around 0 VU. The two pairs of bands combine to create a smooth transition from a gain of more than

20 dB at low levels to unity gain at high levels. This combination not only doubles the processing effect but also doubles the steepness of the filter slopes where the signal requires it, improving the discrimination between boosted and non-boosted areas of the spectrum.

Three-band EQUALIZATION Control

The processor stage in the Spectral Processor boosts all low-level signals across the entire audio spectrum. The equalization section divides the low-level spectrum into three variable bands allowing the user to select which parts of the low-level signal they wish to

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AVISO IMPORTANTE DE SEGURIDAD

Esta unidad cumple con la norma de seguridad IEC65. Para asegurarse un funcionamiento seguro y prevenir cualquier posible peligro de descarga o riesgo de incendio, se han de observar las siguientes precauciones: o o o o

Asegúrese que el selector de tensión esté ajustado a la tensión correcta para su alimentación.

Asegúrese que los fusibles colocados son del tipo y valor correctos, tal como se marca en la unidad.

La unidad debe ser puesta a tierra, conectándola a un conector de red correctamente cableado y puesto a tierra.

El cable de red suministrado con esta unidad, debe ser cableado como sigue:

Vivo Marrón

Neutro Azul

Tierra Verde/Amarillo

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