Abstract:
A four channel recording system starts with a pre-recorded magnetic tape which is played back by two reproducing heads. A first head is used to detect the output signal level read from the tape. The output from the other head is then controlled responsive to the detected level. Thereafter, the controlled signal is recorded on a phonograph record at signal levels set responsive to the output of the first head.
Abstract:
An automatic record changer device of the type in which records yet to be played are supported by a plurality of record supporting members pivotally mounted at the upper portion of a spindle adapted to move up and down within a main spindle body and adapted to be withdrawn into the main spindle body as the spindle moves downwardly so that only the lowermost record may be dropped onto a turntable. The device is capable of detecting the absence of records on the spindle and rendering all the elements of the device inoperative after completion of the playing of the last record.
Abstract:
A recording system comprises means for producing a frame pulse and a color frame pulse from an input NTSC system video signal. Track indication pulses consist of a feed pulse and a two bit feed pulse which cause magnetic heads to move in an intermittent stepping movement and. From the feed pulse is produced a record switching pulse which switches recording of the magnetic head. A reproducing system comprises a field setting means for effecting a H/2 processing and a chroma inverting means for inverting the phase of a subcarrier.
Abstract:
A compressing and/or expanding circuit comprises a first circuit consisting of a frequency characteristic changing circuit having a specific fixed frequency-response characteristic and a frequency characteristic changing circuit including a control element and having a frequency response characteristic variable between a characteristic complementary with said specific fixed frequency response characteristic and a flat characteristic, an amplifier connected in series with the first circuit, and a second circuit provided in a feedback loop associated with the amplifier, which has the same circuit structure as the first circuit. In the compressing circuit, the first circuit, applied with a control signal voltage in response to the level of an input signal, causes its frequency response to vary, whereas the second circuit, applied with a constant voltage, manifests a flat frequency response characteristic. In the expanding circuit, the first circuit, applied with a constant voltage, manifests a flat frequency response characteristic, whereas the second circuit, applied with a control signal voltage corresponding to the signal level, causes its frequency response to vary.
Abstract:
A system for transmitting or recording and reproducing a frequency modulated wave suppresses beats produced by a carrier wave and a signal component of high energy level distribution, which is disposed in a range of higher frequencies of a wave signal. A frequency component, which is liable to be reproduced as a beat signal, is subjected to pre-emphasis. A demodulated signal obtained by demodulating the frequency modulated signal is subject to deemphasis with a characteristic opposite to the preemphasis characteristics applied to the wave signal. Thus the frequency-phase characteristics of the signals is uniform throughout the system, whereby the influence exerted by moire beat interference on the demodulated signal can be minimized.
Abstract:
An omni-directional globular speaker system employs a substantially globular speaker baffle, a plurality of speakers attached to an entire peripheral surface of the speaker baffle, and means for variably adjusting the audio output of a preferred speaker out of a plurality of speakers. The directivity characteristic of the globular speaker system is omni-directional and of a spherical form when the adjusting means is not yet variably adjusted. The variable adjusting means adjusts the directivity characteristic so that the speaker system will have a specified directivity characteristic of a non-spherical form.
Abstract:
The system compensates for an absence of a reproduced signal in one channel with a portion of a reproduced signal in another channel. The compensating signal contains its information which is interrelated with that of the signal absence portion. The compensation is performed by a switching pulse having its width corresponding to an interval of the signal absence portion.
Abstract:
A jitter correction system detects and removes a jitter component, of relatively high frequency, from a reproduced video signal. A reference signal is phase modulated by a jitter component of relatively low frequency. The modulated reference signal and the reproduced signal are compared in phase. The jitter component of low frequency is taken out from the phasecompared error output and fed back to the phase modulating means. On the other hand, the jitter component of high frequency is effectively taken out from the error output.
Abstract:
The rotation control circuit comprises a driving circuit performing a switching action to sequentially flow a current to stator windings of a transistor motor and a control switching circuit performing a switching action by a control signal responsive to the rotation speed of a rotor. The control switching circuit acts to perform a current control at the starting time of rotation of the motor and to perform a voltagecurrent control at the time of constant rotation of the motor.
Abstract:
A temporary stop device for tape recorder temporarily or transiently stopping the running of a tape by parting a pinch roller from a rotating capstan which is contacted with the pinch roller by compression and thereafter instantly running the tape by contacting the pinch roller with the capstan. Contacting and parting operations of the pinch roller with and from the capstan are made by a cam means. A cam operation switch and a tape running indication part are housed in a remote control part at some distance apart from the tape recorder body.