User manual SPL TRANSIENT4

[. . . ] Manual Transient Designer Model 9842 Dynamic Effect Processor Transient Designer Manual Model 9842 By Hermann Gier, Paul Lentzen and Paul White Version 1. 0 - 04/1998 The information in this document has been carefully verified and is assumed to be correct. However Sound Performance Lab (SPL) reserves the right to modify the product described in this manual at any time. This document is the property of SPL and may not be copied or reproduced in any manner, in part or full without the authorisation of SPL. Limitations of Liability: In no event will SPL be liable for any damages, including loss of data, lost profits, cost of cover or other special, incidental, consequential or indirect damages arising from the use of the unit, however caused and on any theory of liability. This limitation will apply even if SPL or an authorised dealer has been advised of the possibility of such damage. SPL electronics GmbH Office address: Sohlweg 55 D-41372 Niederkruechten, Germany Postal address: P. O. [. . . ] The first follows the shape of the original curve (Diagram1: envelope follower Env 1), while the second generator produces the envelope Env 2 (Diagram 1) with a slower attack. The hatched area shows the difference between Env 1 and Env 2 (Diagram 2), and the VCA control voltage is derived from this difference. Positive ATTACK values emphasise attack events, negative ATTACK values smooth out the attack envelopes of events. Two envelopes are generated and compared - the VCA control voltage is derived from their difference. Diagram1 illustrates the original curve and both generated envelopes for processing the attack period. The envelope follower Env 1 corresponds to the shape of the original curve. The attack of Env 2 is lower. Diagram 2 illustrates the difference from Env 1 and Env 2, giving the VCA control voltage. Transient Designer 7 Tech Talk Diagram 3 illustrates the shapes of the processed curves with maximum and minimum attack, compared to the original curve from Diagram 1. The SUSTAIN control circuitry The SUSTAIN control circuitry includes two further envelope generators. The envelope follower Env 3 (Diagram 4), again follows the shape of the original curve. For a longer period the envelope generator Env 4 (Diagram 4) holds the sustain level according to the peak level and the VCA control voltage is generated by the difference between Env 3 (Diagram 4) and Env 4 (Diagram 5: hatched area). With the ATTACK control, the attack period of a signal can be emphasised or attenuated by up to 15 dB. For detailed information about the mode of operation of the ATTACK control please read the section 'Tech Talk' on pages 7 and 8. Attack 3 The ATTACK control circuitry incorporates two envelope generators. One follows the original curve while the second produces an envelope with a slower attack period (Diagram 1, page 7). 10 Transient Designer The difference (Diagram 2, page 7) between these envelopes results in a voltage that controls the VCA, boosting the transient for a period equal to the duration of the original transient. The amplitude of the attack is increased, if positive ATTACK values are set, while negative ATTACK values reduce the level of the attack transient. For detailed information about using the ATTACK control please refer to pages 12ff. Control elements The SUSTAIN control increases or reduces the level of the sustain portion of a signal by up to 24 dB. For detailed information about the mode of operation of the sustain control please read the 'Tech Talk' section on pages 8 and 9. Again an envelope follower pursues the original envelope and adapts optimally to the curve of sustain. This second generator produces an envelope with extended sustain (Diagram 4, page 8). The difference between both envelopes is then used to calculate the voltage controlling the VCA, though as with the ATTACK circuitry, the enhancement ceases at the end of the signal being processed. Sustain amplitude is increased for positive SUSTAIN settings and reduced for negative settings. For detailed information about using the SUSTAIN control please refer to pages 12ff. 4 Sustain When processing stereo material, the LINK function should be switched on so that the linked channels produce the same degree of gain change, regardless of any difference in levels of the two channels. The front panel controls, including the ACTIVE switch of channel 1 or 3, function as the master controls in LINK mode. 5 Link Transient Designer 11 Applications The TRANSIENT DESIGNER is ideally suited for use in professional recording, in project or home studios and P. For the first time the TRANSIENT DESIGNER provides the technology to manipulate the attack and sustain characteristics of a signal regardless of level, and using simple controls. Usually equalisers are used to separate instruments in a mix ­ the tonal aspect of the signal is considered, but not the temporal aspect. By accelerating the transients or/and shortening the sustain of an instrument, the mix can be made to sound more transparent. Instruments can be mixed at lower levels, still maintaining their positions in the mix, but occupying less space. [. . . ] When the GND LIFT switch is set to off, the circuit ground is isolated from the chassis ground. The detachable power cord is a standard 3-wire type fitted with an IEC mains connector; the transformer, power cord and mains connector have VDE, UL and CSA approvals. On the secondary side of the power supply, an RC combination is used to filter out noise and hum. Both half-waves are smoothed with 22, 000 microFarad capacitors in the positive and negative supply path, and both lines use precision voltage regulators for optimum stability. [. . . ]