Abstract: This invention relates to a distortion factor meter circuit adapted to measure a harmonic distortion factor of a signal, particularly. A first transmission line is provided which is adapted to shape a first signal having a harmonic component to produce a DC signal, to convert the DC signal into a square wave having a width proportional to the level of the input DC signal and a predetermined periodicity, and thereafter to produce a triangular wave signal having a level linearly increasing from a zero level during the existence of the level of the input square wave signal and linearly decreasing immediately after the level of the square wave signal disappears. A second transmission line is also provided which is adapted to produce a second signal having a residual harmonic component left by eliminating a fundamental from the first signal.

Abstract: This invention relates to a playback system for a magnetic tape recorder comprising an amplitude distortion corrector. It has an input versus output characteristic such that when the input level is less than the playback saturation level, which corresponds to the start of non-linear characteristics of the playback signal produced from a recorded signal at more than the recording saturation level due to a saturation of the magnetic tape, the output level is proportional to the input level. When the input level is more than the playback saturation level, the input verses output characteristics is complementary to the input versus output characteristic of the magnetic tape at corresponding signal levels.

Abstract: A level meter circuit for indicating a level of input signal over a wide dynamic range, comprising an amplifier of relatively high amplification factor having input terminal means to which an input signal is supplied and output terminal means to be connected to a level meter and negative feedback means including a feedback resistance to feedback an output signal from said output terminal means to said input terminal means, said negative feedback means characterized by further including non-linear impedance means connected in parallel to said feedback resistance and having such characteristics that when said output signal from said output terminal means is below a predetermined level said non-linear impedance means has a substantially infinite impedance and when said output signal from said output terminal means reaches said predetermined level said non-linear impedance means has a predetermined impedance.

Abstract: Magnetic head adjustment means for a magnetic tape machine, comprising a magnetic head mounting plate on which a magnetic head is securely mounted, said magnetic head mounting plate being pivotally movable about contact means to slidably extend through a base plate and engage said magnetic head mounting plate in a plane in which a head gap is contained. Depression means is provided to depress said contact means whereby said magnetic head is adjusted in its vertical position. Vertical position adjusting screw means adjusts the depression of said depression means. Inclination adjusting means is also provided to engage and pivotally move said magnetic head mounting plate whereby said magnetic head is adjusted in its inclination in a magnetic tape running plane.

Abstract: A method for manufacturing a capstan device to a tape machine comprising a double walled sleeve including inner and outer sleeve portions, said outer sleeve portion having supporting means provided on the periphery of said outer sleeve portion and mounted on a chassis of said tape machine, upper and lower bearings fitted into said inner sleeve portion at the opposite ends thereof and a capstan including a capstan shaft rotatably extending through said inner sleeve portion and journalled on said bearings, said method comprising the steps of inserting said inner sleeve portion into said outer sleeve portion so as to provide an annular space between said inner and outer sleeve portions, arranging said inner sleeve portion with said outer sleeve portion so that the common axis of said bearings is substantially normal to the top face of said supporting means on said outer sleeve portion and securing said inner sleeve portion to said outer sleeve portion.