Abstract: In order to easily discriminate a recording mode of a magnetic tape even when the fast feeding/rewinding reproducing operation is set to the odd number times speed or even number times speed, a standard pilot signal for generating the tracking error signal is set to a fixed frequency when the fast feeding/rewinding reproducing operation is performed in the even number times speed of the ordinary reproduction speed and the standard pilot signal is set in the rotational frequencies when the fast feeding/rewinding reproducing operation is performed in the odd number times speed. Thus, the recording mode is discriminated by making reference to the time series pattern of an output obtained by sampling the tracking error signal obtained on the basis of the reproduced pilot signal and the standard pilot signal in the predetermined timing.

Abstract: In a consumption power controlling apparatus for a GaAs FET amplifier, even when a consumption power is controlled, the changes respectively in the gain, the phase, and the deviation of gain within a band can be minimized in a satisfactory manner. There are disposed resistor means arranged between first power source means and a drain region of a GaAs FET and variable resistor means having an adjusting member and being arranged between output terminals respectively of the first power source means and variable voltage means. The adjusting member is connected to a gate region of the GaAs FET. There is also disposed control means having two input terminals between which the resistor means to supply a control signal to the variable voltage means so as to control a voltage developed across the resistor means to be substantially equal to a predetermined reference value, thereby obtaining a fixed drain current of the FET.

Abstract: An electret film is formed on the rear side of a front face plate of a cylindrical capsule made of aluminum . Closely in spaced opposition thereto, an electrically conductive diaphragm is held by an electrically conductive holding member. A wiring board provided behind the holding member closes the rear end of the capsule. The rear end of the capsule is bent on the rear periphery of the wiring board, and calked thereat. In the capsule, an impedance conversion IC device is connected to the electrically conductive holding member and the wiring board.

Abstract: A stereo microphone unit adapted to be installed in a video camera or the like, includes a cabinet, two nondirectional microphones disposed with a predetermined distance therebetween on respective walls of the cabinet for collecting an outside sound signal, delay circuits for delaying each output of the microphones by a time period corresponding to the predetermined distance, and signal subtractors for subtracting the output of the delay circuit relative to one microphone from the output of the other microphone. A stereo audio signal is provided only with regard to the output sound signal of any frequency lower than a predetermined frequency of 6 kHz or so.

Abstract: A light emitting diode device comprises an n type silicon carbide substrate having first and second major surfaces opposite to each other at least inclined at a predetermined angle not less than 3.degree. from a {0001} plane, an n type silicon carbide layer grown on the first major surface, a p type silicon carbide layer grown on the n type silicon carbide layer, a p type ohmic electrode formed on a partial area of the p type silicon carbide layer, and an n type ohmic electrode formed on a partial area of the second major surface. The diode element has a substantially trapezoidal form in a cross section orthogonal to the first major surface. The diode element has the side of the p type silicon carbide layer broader than the side of the second major surface and is supported at the side of the type silicon carbide layer fixed to a supporting stem.

Abstract: A burst signal generating apparatus and related method includes a modulator circuit for modulating a carrier wave of an intermediate frequency signal with a modulating signal. The output of the modulator having a carrier wave frequency is converted to a radio frequency which is amplitude controlled in response to a burst control signal. The carrier wave of the intermediate frequency is switched in response to a burst control signal. Thus, a carrier wave of the radio frequency signal has a desired envelope, permitting ready suppression of the carrier wave during pauses between burst signals.