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| Linear phase response multi-way speaker system |
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Transmitter testing method
| Details |
Inventors: Idol, Charles A.;
Assignee:
Primary Examiner: Bookbinder; Marc E.
Assistant Examiner:
Attorney, Agent or Firm: McConnell; Daniel E.
An oscillator apparatus and method for use in determining the linearity of output of a single sideband radio transmitter in which first and second oscillators are provided for generating respective audio tone signals having first and second frequencies. Each oscillator has a tone amplitude control for adjusting the amplitude of the signal produced. The signals are added, combined, and delivered to a transmitter in such a manner as to permit adjustment of oscillator and transmitter performance to a selected fraction of rated output power on each signal alone. Such adjustment makes possible a determination of linearity as described in the specification. |
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DETAILED DESCRIPTION OF INVENTION While the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which a preferred embodiment of the present invention is shown, it is to be understood at the outset of the description which follows that persons of skill in the appropriate arts may modify the invention here described while still achieving the favorable results of this invention.
Accordingly, the description which follows is to be understood as being a broad, teaching disclosure directed to persons of skill in the appropriate arts, and not as limiting upon the present invention.
Referring now more particularly to the accompanying drawings, FIGS.
1 and 2 are front and rear perspective views of an apparatus in accordance with the present invention as assembled for use.
The apparatus is contained within an appropriate housing, generally indicated at 10, from which protrude a first oscillator on-off switch 11 and amplitude control 12, a second amplifier on-off switch 15 and amplitude control 16, an indicator LED 18, and an output connector 19.
In order to provide supply voltage of desired polarities, the circuitry contained within the housing 10 includes a power supply circuit operatively connected with a battery generally indicated at 20.
Current from the battery is switched through one section of the two on-off switches 11, 15 and is then supplied, through a pair of resistors, to a voltage follower 21 for supply to oscillator circuits and an adder circuit to be described hereinafter.
A first oscillator means contained within the housing 10 includes resistors and capacitors connected with an operational amplifier generally indicated at 22.
By an appropriate selection of the elements, the first oscillator means thus provided functions for generating an audio tone signal having a first frequency.
That frequency may, in one example of a circuit in accordance with the present invention, be on the order of 1300 Hertz.
The frequency is not critical, as the exact frequencies are determined by the resistors and capacitors in a phase shift network
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Audio Signal Processing 
