Abstract: A warning system comprises a piezo-electric ceramic capable of resonating with an ultrasonic wave having a frequency within a predetermined frequency band and thus outputting an electric signal, a resonator capable of detecting only a signal component having a specific frequency from the electric signal output from the piezo-electric ceramic. When the resonator has detected a signal component having a specific frequency, an alarm signal is continuously generated for a predetermined time set by a timer, so that a warning notice is produced by an alarm device in accordance with the alarm signal.

Abstract: An anti-theft alarm device for a vehicle, the device having: (a) a detector for detecting an emergency of the vehicle and for emitting a detection signal; (b) a switch for setting and deactivation the alarm device, the switch emitting selectively a setting and a deactivation signal; (c) a control circuit for transmitting selectively an alarm signal in response to the detection signal and confirmation signals in response to setting signal and deactivation signal, the confirmation signals being weaker than a alarm signal; (d) an alarm speaker for selectively generating an alarm sound and a confirmation sound in response to the alarm signal and the confirmation signals respectively, whereby generating an alarm sound according to an emergency of the vehicle and a confirmation sound when the alarm device is set and deactivated.

Abstract: A Hall-effect device and a magnet are mounted on respective resonant bridge supports in magnetic field relationship whereby movement of either the magnet or the Hall-effect device produces a change in the field strength at the Hall-effect device. The two support structures with their mounted components exhibit different natural resonant frequencies whereby stimuli in either of two different ranges causes one or both of the magnet or Hall-effect device to move at their resonant frequency producing a signal. Signal processing circuitry disregards D.C. signals from the Hall-effect device and responds only to A.C. signals, indicative of shocks in the 1000 to 2000 Hertz range or movement of the detector with components in less than the 150 Hertz range. Three different bridge structures are disclosed, one with separate bridges, one employing common support columns and one which is integrally molded.

Abstract: Disclosed is a wireless talking apparatus in which signal transmission is performed by utilizing an antenna and simultaneous talking can be performed. The wireless talking apparatus is constituted by a main communication device and a subsidiary communication device, and when these main and subsidiary devices are used in one-to-one correspondency, talking can be performed in a full-duplex communication mode, and in the case where a plurality of subsidiary communication devices are prepared, mutual talking can be performed also between the subsidiary communication devices and the conversation can be monitored by the main communication device.

Abstract: Disclosed is a motion sensor for sensing movement of an object to be monitered, the motion sensor comprising a support disk having a concave upper surface, a ball rotatably put on the support disk, and a piezoelectric element attached on the support disk. If the object attached with the motion sensor inclines or swings, the ball rolls on the support disk to cause the support disk to vibrate. The vibration is taken out as an electric signal by the piezoelectric element and the electric signal informs of the fluctuation occured on the object. An electromagnet, upon energization, prevents rolling movement of the ball.

Abstract: A radio transmitter and receiver device in which a head band has a transmitting microphone at one end and a receiving speaker at the other end. This microphone comprises a bone transmission type microphone for detecting aural oscillation of an external auditory canal transmitted through a bone tissue of a head portion from a mouth, said microphone being brought into contact with a side head portion at the rear of an ear. Thus, one ear is blocked by the speaker but the other ear is open, and therefore, a user can catch noises thereabout. A transmitting and receiving antenna has matching means and is mounted on the side of the speaker.

Abstract: A vibration-detecting-type microphone for detecting voice vibrations by being contacted to the buccal region or the mastoid of the temporal region of a user. This microphone has a belt-like diaphragm whose both ends are fixed to a casing with one end open, a piezoelectric element installed on the rear central part of this diaphragm, and a vibration pickup situated on the external surface of this diaphragm and designed to be contacted with the human body. The rear surface of the vibration pickup has at least one pair of sensing elements, and these sensing elements are located in such a way that they will not oppose the piezoelectric element through the diaphragm. This arrangement makes it possible to select and set the resonance frequency of the diaphragm and microphone, as desired.

Abstract: A power source device for a portable type radio apparatus having a transmitting circuit wherein the transmitting circuit is connected to the power source through a time constant circuit and a tone signal generating circuit is connected to the time constant circuit through a delay timing circuit. The tone signal generating circuit is operated at a required time before the operation of the transmitting circuit is terminated by the time constant circuit to inform a user of the fact that the transmitting circuit is about to be stopped in operation.

Abstract: A cordless transmitting and receiving apparatus which is capable of providing transmitting and receiving between a key transmitting and receiving apparatus such as a telephone and a portable remote transmitting and receiving apparatus and in which a transmission signal from the key transmitting and receiving apparatus is received in the remote transmitting and receiving apparatus by electromagnetic induction through a commercial AC power line. The cordless transmitting and receiving apparatus has a relay transmitter, which transmits a transmission signal from said remote transmitting and receiving apparatus to said key transmitting and receiving apparatus through said AC line.

Abstract: A tone signal decoder in a remote control device which uses one tone signal to feed information. The tone signal decoder comprises a charge and discharge circuit having a capacitor to control the latter by application of said tone signal thereto, a bypass circuit for charging or discharging said capacitor, when said tone signal is not applied, within the time shorter than the charge or discharge time by said charge and discharge circuit, and a threshold circuit actuated when said capacitor reaches a threshold level. Immediately when said tone signal is interrupted by said bypass circuit, said capacitor is brought into an initial set state to prevent malfunction with respect to the other tone signal fed by the same carrier.

Abstract: An alarm unit is provided which prevents a theft of a vehicle by producing acoustical alarm whenever a third party opens a door of the vehicle. The unit operates by applying a remote control signal from an external signal emitter to a pickup assembly which is mounted inside the vehicle on a front or a rear glass pane. A control circuit connected to the pickup assembly is then set in its standby mode, and conditions the unit to produce an acoustical alarm if the door is opened during such mode. The standby mode is reset by a second application of the remote control signal to the pickup assembly.

Abstract: An antenna assembly for vehicle radio transceiver which is detachably mounted on the car body of an automobile, for example. The assembly includes a rod-shaped antenna, a hollow casing which supports the lower end of the antenna, a permanent magnet for securing the casing to the car body by magnetic attraction, a vibration detector which electrically detects any vibration applied to the casing, and an alarm circuit which operates to produce an alarm in response to detection of vibration applied to the casing or the car body. The vibration detector includes a printed circuit board which is placed on the bottomplate of the casing and which is formed with a first and a second electrode each including a plurality of interdigitated fingers and connected across a d.c. power supply circuit. The vibration detector also includes a conductive spherical body which is placed on the printed circuit board in a rollable manner.