Abstract: An apparatus fo effectively increasing stereophonic sense when the distance between left and right loudspeakers is small is disclosed.This apparatus enlarges the apparent distance between the left and the right sources of sound by vectorially adding the sound signals of the left and the right channels. This apparatus has a phase reversing circuit, a mixer circuit, and a band-pass filter in each of the left and the right channels. The phase reversing circuit is a negative feedback type tone control circuit, the mixer circuit includes a stereophonic sense increasing effect on-off switch device capable of switching load impedances, and the band-pass filter passes a sound frequency band that is useful for increasing the stereophonic sense.

Abstract: In an operating mechanism of a tape recorder, there is provided means for preventing the play-back operation from being released by the cue or the review being effected and for permitting the play-back operation to be resumed immediately after the cue or the review is interrupted. There is also provided means for ensuring that the recording lever and the review lever or the cue lever, if pushed in at the same time, are automatically returned to their non-pushed-in position upon release of the push-in force.

Abstract: A method and apparatus for imparting a predetermined tension to a tape transported at a predetermined velocity from one to the other of reels mounted on a pair of reel spindles at least one of which is rotated by a motor to have a rotational torque imparted thereto. A signal is provided which has a frequency proportional to the number of revolutions of the reel spindle; an impulse is produced which has a frequency corresponding to the frequency of said signal; a reference voltage is integrated for a time corresponding to the period of said impulse; the peak value of a signal resulting from said integration is sample-held in accordance with said impulse; and a signal resulting from said sample-holding is applied to the motor, thereby imparting a predetermined tension to the tape.

Abstract: A cassette tape recorder comprising a cassette eject mechanism designed so that a cassette receptacle is positively pivotally moved, by depressing an eject key, to an inclined position where a cassette can be inserted thereinto or removed therefrom, and a safety mechanism for preventing the eject key from being depressed when a playback key is depressed and for preventing the playback key from being depressed when said receptacle assumes the inclined position. The aforementioned cassette eject mechanism also includes cassette push-out means which is so designed as to be actuated by the depression of the eject key at the time when said cassette receptacle has substantially reached said position, thereby pushing said cassette partially out of said receptacle.

Abstract: In a recording system or the like including two, left and right, channels, an automatic gain control circuit for ensuring that the characteristics of the two channels always be substantially equal to each other, wherein a variable impedance circuit comprising at least one transistor is provided in association with each of the foregoing channels; a correcting variable resistor is connected between the bases of the transistors; and a control signal source is provided which has one terminal thereof connected to the movable contact of the correcting variable resistor, the other terminal of the control signal source being grounded and connected across the correcting variable resistors through shunt resistors.