受験番号：12IPE003==============================================================
問１
CLAIMS
Claim 1
An image forming system comprising:a plurality of image forming apparatuses each being capable of forming an image, the plurality ofimage forming apparatuses being connected together in a daisy chain manner,each of the plurality of image forming apparatuses including:storage means for storing apparatus speed information indicating an image forming speed of thatimage forming apparatus;
downstream speed information obtaining means for obtaining downstream speed information indicating
an image forming speed of a subsequent image forming apparatus connected to that image forming apparatus,that image forming apparatus and the subsequent image forming apparatus deconcentrating an image forming
amount;receiving means for receiving image forming data including image data for forming an image;determination means for determining, on the basis of the speed information and the downstream speed
information, an image forming amount of that image forming apparatus in a total image forming amountindicated by the image forming data;
execution means for executing image forming, an amount of which has been determined by thedetermination means; andinstruction means for causing the subsequent image forming apparatus to execute image forming, anamount of which is equal to an amount obtained by subtracting the image forming amount of that image
forming apparatus from the total image forming amount indicated by the image forming data.
問２
Generally, a nonlinear sound system includes (i) a modulator for modulating an ultrasound carrier
wave signal by use of an audio signal that has been subjected to signal processing, (ii) a drive amplifier
for amplifying the modulated signal, and (iii) at least one sound transducer for emitting, via theatmosphere, the amplified signal along a specific projection path. The atmosphere has nonlinearity.
Therefore, an ultrasound signal is demodulated as it passes in the atmosphere. Along a specific projection
path in which the signal passes, an audio signal is reproduced.
One of problems of a general nonlinear sound system is that a reproduced signal is most likely toinclude high-level distortion. According to a conventional method for reducing a distortion level of such a
reproduced audio signal, a distortion level of an audio signal generated in the nonlinear sound system issuch that (i) a low-level ultrasound signal is proportional to approximately a square of a modulationenvelope and (ii) a high-level ultrasound signal is proportional to approximately the modulation envelope
itself. For this reason, according to the conventional method, the distortion is reduced in such a mannerthat (i) a square root of an audio signal is found and (ii) the square root is multiplied by a constantobtained from experience.
The method can reduce the distortion at a specific ultrasound signal output level, but generally
cannot reduce the distortion over an entire range of ultrasound signal output levels.
問3
Fig. 5 is a circuit diagram illustrating a power section of an active filter in accordance with anembodiment in which an electrolytic capacitor is used as a compensating capacitor 6. An electrolytic
capacitor has an acceptable range for a ripple current. Therefore, when the electrolytic capacitor is usedas the compensating capacitor 6, it is necessary to suppress a current in a charging operation to be within
the acceptable range. In the charging operation, a sawtooth current having sharp changes flows. Therefore,
the active filter is arranged such that (i) first, a high-ripple capacitor 25 (which is a film capacitor)
is charged, and then (ii) the compensating capacitor 6 is charged via a smoothing reactor 26 forsuppressing a ripple current.
Note that, in order to further reduce a ripple current as explained with reference to Fig. 5, anadditional circuit is provided, which additional circuit (i) first, charges the high-ripple capacitor 25,
and then (ii) charges the compensating capacitor 6 via the smoothing reactor 26. With the circuit
arrangement, a peak current of the sawtooth current becomes 1/√2 (1/root 2) of that of the active filter
illustrated in Fig. 1. The peak of the ripple current can be thus suppressed. Further, with the circuit
arrangement, it is possible to improve a harmonic of a carrier wave and a radiation noise.

1