Because the number of hertz hundreds required is 2, the first decade provides 11, which is 9 more, as outlined earlier.
#Schematics for a osculator synth generator#
In this instance, it is continuously tunable, with smallest divisions of 0.1 Hz, and is here made to provide 165.0 Hz because the frequency required ends in 65 Hz.Įach of the following decades consists of a divider, a spectrum generator whose function it is to provide all the harmonics from the ninth through to the eighteen of the frequency fed to it, a set of 10 narrow band filters to select any one of these harmonics by switching, a balanced mixer and a set of 10 band-pass filters, again selected by switching. The operation of the decades ahead and the impossibility of covering the range from 0 to 100 Hz. The interpolating oscillator is a highly stable RC oscillator whose frequency range, 100 to 200 Hz, is determined by two considerations. The last decade is made to provide 10 MHz less, and the correct frequency is obtained. Coupled with the extra nine units added by every decade, this means that the signal fed by the megahertz units decade to the last mixer is 10 MHz larger than the dial shows. The interpolating oscillator selects f + 10 units. In fact, it is seen that all circuits except the first and last are made to select f + 9 units, where f units is the frequency one might have expected that decade to select. It will be seen immediately, for instance, that the kilohertz hundreds decade is not made to select 900 kHz in this case, but rather 1800 kHz. Let this frequency be 34,970.265 kHz, as shown in Figure 6-24.
The circuit has also lent itself to the use of large-scale integration (LSI).Ī convenient method of explaining the operation and reasons for certain circuit arrangements is to show how a typical frequency is selected. As shown by the Direct Synthesizer Block Diagram Figure 6-24 and the illustration of Figure 6-25, the direct synthesizer lends itself ideally to modular construction, with extra self-contained decades added as required.
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