Handbook for Sound Engineers

872 Chapter 25 really quiet!). The impedances around the second stage largely determine the noise performance of the ampli- fier ...

Consoles 873 matched; poor matching is a very easy way to wreck carefully won common-mode performance. 25.10.7.3 Line Level Inpu ...

874 Chapter 25 to match the inadvertent internal characteristics, Fig. 25-56. Jensen transformers are uncannily good in this res ...

Consoles 875 The limiter side chain is true symmetrical peak detecting, selectable to be able to pick off from either the high-p ...

876 Chapter 25 and the occasional genuine creative effect, the contrac- tion EQ is well understood as both a noun and a verb. Th ...

Consoles 877 Figure 25-58. Single order filters. Vin R Vo C Ground Voltage source (zero impedance) Vin Vin Vin Vo Vo Vo Vo ...

878 Chapter 25 frequency at which the curve departs significantly from flat. Standard arithmetic formulas normally consider or o ...

Consoles 879 Referring again to Fig. 25-59, a slightly different light shines. The two reactances are working in direct oppositi ...

880 Chapter 25 A true gyrator is a four-terminal device that trans- mutes any reactance or impedance presented at one port into ...

Consoles 881 25.11.11 The Bootstrap The simplest fake inductor is shown in Fig. 25-63A, with typical values. It relies on a tech ...

882 Chapter 25 strapped to high impedance via the 150: resistor at high frequencies and the bootstrap voltage reducing (together ...

Consoles 883 A minor failing with this simple circuit is that at high frequencies a parallel impedance (consisting of the vari- ...

884 Chapter 25 the way humans react to audible stimuli, and also from the way nature deals with things acoustic. If something is ...

Consoles 885 There comes a breakpoint with increasing Q where you are not so much listening to the effect of the filter as to th ...

886 Chapter 25 Figure 25-65. Loop filters. RCR C R C R C. Introducing loss to temper the Q to usability. A. Three-inverter loop ...

Consoles 887 Loop filters, such as described in Fig. 25-65, have a number of inherent problems that are usually glossed over for ...

888 Chapter 25 25.11.21 Q and Filter Gain Pretty much every resonant-type active filter has the characteristic of its gain at re ...

Consoles 889 filter input out of two capacitors such that the input signal is attenuated by the needed amount yet the combined c ...

890 Chapter 25 Second-order filters, assuming moderate filter Qs associated with Bessel or Butterworth characteristics, score we ...

Consoles 891 around today’s more familiar op-amp technology rather than discrete transistors or tubes. Fig. 25-67A shows a virtu ...