Abstract: A signal processing apparatus for an optical disk system which apparatus has a variable gain amplifier that amplifies with a variable gain a light-detected signal obtained from an optical disk on which to perform playback processing so as to make a level of the light-detected signal coincide with a first reference level. The apparatus comprises a comparator that compares the level of the light-detected signal amplified by the variable gain amplifier with the first reference level; a gain adjuster that generates and supplies a control signal to adjust the variable gain according to a result of the comparing to the variable gain amplifier; and a gain adjustment controller that, when the level of the light-detected signal amplified is within a level range including the first reference level, controls a level of the control signal of the gain adjuster to be held at its preceding value.

Abstract: An offset adjusting apparatus adjusting an offset of an output signal output from an output terminal of an operational amplifier including one input terminal to which an input signal is to be input via a first resistor and the other input terminal to which a reference voltage is to be applied, the operational amplifier being connected between the one input terminal and the other output terminal, the offset adjusting apparatus comprising: an adjustment resistor configured to be capable of adjusting a resistance value, the adjustment resistor including one end to which an adjustment voltage for adjusting the offset is to be applied and the other end connected to the one input terminal of the operational amplifier; and a controlling unit configured to control the adjustment voltage applied to the adjustment resistor based on a DC level of the output signal to remove the offset.

Abstract: A combined AD/DA converting apparatus includes an input signal selection circuit configured to select one analog signal out of a plurality of analog input signals based on an input selection signal; an input sample hold circuit configured to sample and hold the analog input signal; a DA converter configured to convert a digital signal into an analog signal; a comparator circuit configured to output a comparison signal that indicates a size relation between the analog input signal and the analog signal; a sequential comparison register configured to define sequentially each place of a digital signal stored in the register based on the comparison signal; and a selection circuit configured to output the digital signal to the DA converter when the conversion selection signal indicates AD conversion, and to output the digital input signal to the DA converter when the conversion selection signal indicates DA conversion.

Abstract: The object of the present invention is to improve the elasticity of a nonwoven fabric manufactured by the spunbonding method. To attain the object, the present invention provides a nonwoven fabric manufactured by the spunbonding method, wherein a lot of holes are formed in the nonwoven fabric by the needle punching method, to give said nonwoven fabric elasticity. Synthetic resin may be impregnated into the nonwoven fabric.

Abstract: A combined AD/DA converting apparatus carrying out AD conversion of an analog input signal to output a converted digital signal or carrying out DA conversion of a digital input signal to output a converted analog signal based on a conversion selection signal for selecting AD conversion or DA conversion comprises an input signal selection circuit configured to select one analog signal out of a plurality of analog input signals to be output based on an input selection signal; an input sample hold circuit configured to sample and hold the analog input signal output from the input signal selection circuit; a DA converter configured to convert a digital signal into an analog signal to be output; a comparator circuit configured to output a comparison signal that indicates a size relation between the analog input signal output from the input sample hold circuit and the analog signal output from the DA converter; a sequential comparison register configured to define sequentially each place of a digital signal stored

Abstract: An offset adjusting apparatus adjusting an offset of an output signal output from an output terminal of an operational amplifier including one input terminal to which an input signal is to be input via a first resistor and the other input terminal to which a reference voltage is to be applied, the operational amplifier being connected between the one input terminal and the other output terminal, the offset adjusting apparatus comprising: an adjustment resistor configured to be capable of adjusting a resistance value, the adjustment resistor including one end to which an adjustment voltage for adjusting the offset is to be applied and the other end connected to the one input terminal of the operational amplifier; and a controlling unit configured to control the adjustment voltage applied to the adjustment resistor based on a DC level of the output signal to remove the offset.

Abstract: The object of the present invention is to provide a sound absorber such as a hood silencer, attached to the underside of the hood panel of a car to absorb sound from the engine, said sound absorber having excellent fire resistance and sound absorbability. To attain said object, the present invention provides a fire resistant sound absorber 1 made of a porous material 2 into which a phenolic resin is impregnated, said porous material 2 using fibers with a fineness in the range of between 0.02 dtex and 50 dtex, with phenolic resin content in said porous material 2 being adjusted to be in the range of between 50 and 200% by mass per unit weight of said porous material 2.

Abstract: A signal processing apparatus for an optical disk system which apparatus has a variable gain amplifier that amplifies with a variable gain a light-detected signal obtained from an optical disk on which to perform playback processing so as to make a level of the light-detected signal coincide with a first reference level. The apparatus comprises a comparator that compares the level of the light-detected signal amplified by the variable gain amplifier with the first reference level; a gain adjuster that generates and supplies a control signal to adjust the variable gain according to a result of the comparing to the variable gain amplifier; and a gain adjustment controller that, when the level of the light-detected signal amplified is within a level range including the first reference level, controls a level of the control signal of the gain adjuster to be held at its preceding value.