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Anleitung Zusammenfassung
When the DETECT LIMIT LED (reference (10)) flashes, the maximum gain reduction will be 32dB. (4) ATTACK The signal level of the compressor is controlled by an internal VCA (Voltage Control Amplifier). The response time of that VCA is determined by this rotary control, which is continuously variable from 0.2 through 20 msec. (5) RELEASE The amount of time it takes the control circuit to recover from processing and return to unity gain is determined by setting this continuously variable rotary control from 50 msec, through 2 sec. (6) INPUT Due to unique design efficiencies this rotary control performs two functions simultaneously. While the threshold level at the input of the VCA detect circuit is fixed at about -18dBV (0.13V), by varying the input level you effectively vary the threshold level. The total amount of gain reduction is determined by the setting of the compression ratio slope and this input level control. At a nominal -lOdBV line level reference, the threshold is obtained with the INPUT knob at scale 3^4, and most of the audio signal is passing unprocessed (linear response). See Figure 1. Fig. 1 With the compressor ratio slope set at “:1 it is likely that the detect limit LED will light, indicating 32dB of gain reduction. It should be noted that this LED does not indicate overload of the audio signal; there is an additional 32dB of system headroom before the compressor/limiter circuit overloads. (7)OUTPUT This rotary control is for adjusting the output level of the processed signal. In a nominal scale position of 4 to 5, referenced to -18dBV at the detect circuit input, the signal level present at the output jacks will be -lOdBV (0.3V). 3 (8) GAIN REDUCTION (dB) This series of five LED's displays the amount of gain reduction in calibrated decibel readings at 0, 4, 8, 16 and 24. These diodes will not light when the COMP switch is in the OUT position. (9) EXP GATE This LED lights when the expander/noise gate circuit is in use, and when the signal present is below the threshold (determined by the setting of the EXP GATE control (2)). When this LED turns off, the signal present is above the threshold setting and is being processed accordingly. (10) DETECT LIMIT 32dB When this LED lights, maximum gain reduction of 32dB has been reached. It also indicates that the detect circuit is overloading and can no longer control the operation of the VCA on a one-to-one basis. Please note that there is 32dB more system headroom above the overload point of the detect circuit, so this LED does not indicate distortion of the audio signal. (11) LINK When this switch is in the DUAL MONO mode (UP), the front panel controls for each channel will operate independently. In the STEREO mode (DOWN), VCA operation is linked and both channels will be processed together. NOTE: The VCA will link with EXP GATE controls via the detect signal from the channel which is set at the higher threshold level. Both controls must be ON for stereo operation of the expander/noise gate function; if either control is OFF, single channel operation results. Turn both controls OFF if you do not require this function for stereo processing. 4 (12) POWER ON/OFF switch for the 3070 with LED power ON indicator. 2. LOCATION OF CONNECTIONS (Rear panel) (1) INPUT - Pin jack Input levels here which will raise the gain to threshold level are: (A) OdB (IV) with the input level control at full CCW position; and (B) -36dBV (16 mV) at full CW position. (2) INPUT - Phone jack There is a lOdB pad at this jack, so it can accept an input signal lOdB higher than the pin jack. Thus, input levels here which will raise the gain to threshold level are: (A) +10dB (3V) with the input level control at full CCW position; and (B) -26dBV (50 mV) at full CW position. (3), (4) OUTPUTS The pin jack (3) and the phono jack (4) are wired in parallel. (5), (6) DETECTOR IN-OUT This patch point gives you access to the detect circuit which controls the VCA operation of the compressor/limiter circuit. By inserting other processors such as equalizers, or audio signals themselves such as vocals, a limitless variety of creative effects can be produced. (7) AC Power Cord 5 3. INTRODUCTION The Fostex Model 3070 Compressor/Limiter Unit is designed for wide applications in the process of compression and limiting. The key is operational flexibility because the program material itself will always be a significant factor in determining the ultimate use of the Model 3070. And in this reason, the compressor slope, attack time and release time are all continuously variable. The noise gate function has an independent threshold setting like having another signal processor in the same chassis. You can choose between independent 2-channel operation or linked stereo mode where the stronger of the two signals triggers processing, thereby preserving original stereo imaging. One of the most outstanding features of the Model 307 0 is the control element. Gain reducti...