Abstract: A video cassette recorder (VCR), using an automatic track finding (ATF) error as a control signal, is comprised of a capstan rotated by a motor, a frequency signal generator also rotated by the motor, and an ATF error measurement circuit for measuring a plurality of ATF errors before switching in an assemble mode.

Abstract: A facsimile apparatus includes a helical scan VTR. Binary data of a received facsimile signal is recorded on a first area of a recording medium in the VTR, and also the received facsimile signal is converted into a television signal and then recorded on a second area of the recording medium so that the recorded facsimile signal can be viewed as a video image on a screen of a TV monitor and further the recorded facsimile signal can be searched on the screen through a high-speed search.

Abstract: An apparatus for controlling the time base of a first video signal, for example, from a character signal generator, to be superimposed on a second video signal reproduced from a record medium, as by a VTR, and having a time base which is fluctuating, includes a detector for detecting time base fluctuations of the second video signal and producing an output signal representing the time base fluctuations, and a time base control circuit for controlling the time base of the first video signal on the basis of the output signal from the detector, such that the time base of the first video signal is correlated to the time base fluctuations of the second video signal.

Abstract: In a method of forming an electric welded steel tube, wherein a hot-rolled sheet is formed into a cylindrical shape, with the central portion thereof being lowered as the forming progresses, and thereafter, subjected to reduction in the circumferential direction of the tube by means of tandem type fin-pass rolls to be finished into the tube, the proper forming condition ranges capable of eliminating occurrence of edge waves in the tube seam edge portion and/or of cambers in the longitudinal direction of the tube by three forming conditions factors including the downhill value D.sub.H (downhill coefficient .eta.) of the hot-rolled sheet, the fin-pass total reduction R of the tandem type fin-pass rolls and the distribution of the fin-pass reduction (the distribution ratio .delta. of the first fin-pass reduction).

Abstract: Apparatus is described which is particularly useful for recording pulse signals on a magnetic recording medium. The apparatus includes an amplitude modulator, preferably a balanced modulator, that is supplied with the pulse signal and with a carrier upon which the pulse signal is amplitude-modulated. The pulse signal has gradually rising and falling edges which exhibit a maximum gradient. The modulated carrier is substantially fully suppressed when the maximum gradient of the pulse signal traverses a predetermined level. Preferably, the modulation factor of the amplitude modulator is greater than unity. When used with additional recording apparatus, the balanced modulated signal is filtered by a vestigial sideband filter, and the filtered, balanced modulated signal is frequency-converted to a lower frequency band. The frequency-converted balanced modulated signal is superimposed with an AC bias signal and then recorded.