| 摘要 |
PURPOSE:To eliminate the crosstalk between channels, by making the secondary impedance of a multichannel secondary coil, which is wound around the core of an oscillation coil, lower than the resultant impedance of a sound recording head and a sound recording current equalizer. CONSTITUTION:A frequency for sound recording bias is oscillated by one oscillating circuit consisting of a transistor TR16, a resistance 15, and a primary coil 10a of a transformer 10, and recording current bias currents induced in secondary coils 10b and 7b wound around the same core are supplied to magnetic heads 6a and 6b of two channels. If the secondary impedance of the transformer 10 in the frequency band of a sound recording signal is made lower sufficiently than the resultant impedance of magnetic heads 6a and 6b and sound recording current equalizers 9a and 9b, the crosstalk of the sound recording current between channels is ignored even if multichannel secondary coils are wound around the same core. |
