Abstract: An intra-oral artificial larynx is provided including a signal generator and a speaker mounted on a prosthesis for mounting the larynx within the intra-oral cavity. A horn is provided having an input opening coupled to the speaker for acoustically amplifying the output of the speaker, the horn also having an output opening. A saliva barrier is removably mounted to the output opening of the horn for precluding penetration of saliva into the horn, the barrier having a first end which is telescopically received within the output opening of the horn and the second end having a mouth formed on a bias to the longitudinal axis of the mounting and a microporous membrane sealing the mouth. The mouth of the mounting has an elliptical shape which has been found to increase speaker volume. Moreover, the telescopic mating of the mounting and the horn provides a saliva barrier which is easily replaceable by the user.

Abstract: The present invention provides a completely self-contained intraoral larynx comprising a power source, tongue activated controls, power saving signal generation circuitry, acoustic and audio amplifiers, and an intra-oral speaker. These components are contained within an otherwise conventional denture or dental prosthesis. The device produces a high amplitude sound while minimizing current drain from the power source. Laryngectomized patients require only short term training by a speech pathologist to use this device. Intelligible speech is usual within an hour of such training, and facility rapidly improves. The psychological barriers, post-operative physical limitations, aesthetic concerns and limited gestural communication traditionally associated with the use of extra-oral larynges is eliminated by the present invention.

Abstract: In a cordless telephone, normal tape recorder or micro cassette tape recorder is operated by memberance touch and is coupled to the main body of the telephone. The tape recorder operates on a cordless remote-control unit at remote distances from basic unit by means of control switch (record, play basic, rewind, fast forward, stop) attached to the remote unit. This arrangement provides a remote control record/play back cordless telephone to record and play back the speech content in the remote unit while the opposite party is on the telephone or before the speaking begins. The remote unit includes a digital encode circuit that converts the signal of a selected function for control switch into a digital signal corresponding to the selected function, FM-modulates and amplifies said digital signal, and then cordlessly transmits it to base unit. On the other hand, base unit includes a complementary digital decode circuit and transceiver.

Abstract: Replaceable snap-together wires, headphones, headband and plug comprise a modular stereo headphone apparatus. Sealed headphones are provided with walled receptacles to receive mating removable clips secured to the ends of connecting wires. Each clip is molded to the wire insulation and around the wire ends which protrude slightly beyond the clip. Each clip is provided with a protruding movable lever arm with an indent for mating with a protrusion inside a receptacle shaped to fit the clip. Wires from the sound system within each headphone protrude through each receptacle wall to mate in proper polarity with wires in the inserted clip. A flexible headband is provided along its length with either a groove or tabs to receive a headphone connecting wire removably secured to the headband. At each headband end a sleeve receives a protrusion from one headphone adjustably secured to the headband with a spring-loaded pin in the sleeve engaging notches in the headphone protrusion.

Abstract: In the camera disclosed, a control circuit responds to a focus detecting circuit to energize first display portions to produce a first mark representing the detected distance, and responds to a setting arrangement to energize other display portions to produce a second different mark representing a set distance. According to an embodiment, the control circuit displays a third mark when the first and second marks coincide.

Abstract: An FM stereo demodulator having improved separation and distortion characteristics comprising a high-frequency pulse signal which is modulated by a sinusoidal subcarrier signal produced in accordance with a stereo pilot signal. The high-frequency pulse signal is multiplied with a composite signal at a multiplier so as to reproduce left and right signals without frequency components of noise. Constructed accordingly, the invention advantageously obviates the use of a low-pass filter which injects delay characteristics and reduces gain of the composite signal from an FM demodulator.

Abstract: Apparatus for reproducing sound having an expanded acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output, which need not be binaural. A right main speaker and a left main speaker are disposed at right and left main speaker locations, respectively, which are equidistantly spaced from a listening location along a listening axis perpendicular to a line joining the left and right main speakers. The interaural time delay between the ears of a listener at the listening location with respect to the main speakers is .DELTA.t. A first right sub-speaker and a first left sub-speaker are respectively disposed at right and left sub-speaker locations equidistantly spaced from the listening location, and spaced such that sound from the sub-speakers as perceived by the ears of a listener is delayed as compared to sound from the main speakers by .DELTA.t. The left and right channel outputs are coupled to the left and right main speakers, respectively.

Abstract: A power line telephone extension system for carrying electrical signals between a subscriber's telephone line of a conventional telephone communication system and the subscriber's remote transmit-receiver device, (such as a conventional extension telephone), over the AC electric power wires available to the subscriber which includes: master linking circuits for processing signals between the subscriber's telephone line and the AC power wires; extension linking circuits for processing signals between the AC power wires and the subscriber's remote transmit-receive device, such as a conventional extension telephone; and a directional coupler circuit electrically coupling the remote transmit-receive device and the telephone line. The extension system is quite suitable for use with the presently available, well known, conventional extension telephone that plugs in by the plug (modular or 4 prong) provided therewith, to the directional coupler.

Abstract: A programmable adjustable distortion amplifier circuit has a first channel having an adjustable gain and a filter for filtering high and low frequency components of signal processed by the first channel, a second channel having an adjustable gain and a filter for filtering high and low frequency components of signal processed by the second channel, a parametric equalizer providing adjustable preselectable frequency bandwidth and a vacuum tube amplifier and support circuitry permitting adjustment of distortion of signal processed by the second channel by a preselected amount. An optional phase shift circuit delays a portion of signal processed by the second channel with the delayed portion provided to the second channel downstream of the parametric equalizer but upstream of the tube. A summing device combines output signals of the first and second channels for input to an adjustable gain control for subsequent input to audio speakers.

Abstract: A device for giving an audio signal to a coil associated with an audio-band electromechanical converter uses a mixer, a first-stage low-pass filter, a limited and a second-stage low pass filter to correct distortion of the wave form of a signal from the limiter.

Abstract: A security device connected to telephone lines and to at least one sensor comprises a monitoring circuit for monitoring at least one sensor to determine a status of each sensor and to detect when the status of any sensor is a fault status, an automatic call-up circuit settable by the user of the device in accordance with a preselected telephone number to be called for automatically calling the preselected telephone number to report when any status comprises a fault status, and an answer circuit for receiving and answering any incoming telephone call received over the telephone line, and responsive to reception of a user input transmitted over the telephone lines, and designating a selected sensor to be monitored, for monitoring the sensor and transmitting the status of the sensor over the telephone line.

Abstract: Disclosed is a digital station apparatus, such as a digital telephone set, capable of being operated in parallel on a subscriber's digital loop (e.g. in an extension mode) without the need to route all the PCM signals to common equipment. Only one of the parallel sets is active at a time; all the others are passive. In the passive state the telephone set receives only, and does not transmit. It monitors its own signal magnitude relative to the signal magnitude produced by the active "extension" on the same digital loop. When its own signal magnitude has satisfied a comparison criterion, then that passive set becomes active and both transmits and receives, while all other sets on the loop are passive.

Abstract: A transparent secondary information transmission system for a primary information transmission system is disclosed. The system includes at least one local condition monitor for monitoring at least one of a plurality of input conditions such as temperature, light, smoke or the presence of an intruder. The information representing the condition is digitized and processed by the local condition monitor. The digitized signals are then transmitted over the transmission system in such a way that no interference with normal transmission occurs. At the receiving end, the signals are processed to determine from which of the local condition monitors the signals are being received and what the status of the monitored condition is. A determination is then made whether an alarm should be generated. In the preferred embodiment, the primary information transmission system to which the secondary information transmission system is adapted to be coupled is a telephone network.

Abstract: An automatic telephone message device for transmitting recorded messages to predetermined telephone numbers. The device is connected to the telephone jack and AC power source of the user's telephone, and is also connected to a standard tape recording system. One or more messages are recorded by the user on the tape recorder. The microprocessor controlled circuitry of this device provides memory space for convenient storage and modification of several telephone numbers. This device is responsive to manual, timed automatic or remotely generated activation signals for transmitting the recorded message to parties answering at the specified telephone numbers. An additional audible alarm may be set to sound at predetermined times, and if a manual switch is not closed within a specified time thereafter, the device calls the selected telephone numbers and transmits the recorded message.

Abstract: An FM broadcasting system comprises an FM transmitter for transmitting a multiplex signal which is frequency-modulated on a main carrier wave and an FM receiver for cooperation with said FM transmitter. The multiplex signal comprises: an audio-frequency first information signal and, in the case of a stereo transmission, a second information signal modulated on a suppressed stereo subcarrier, a stereo pilot signal whose frequency (f.sub.p) is situated between the frequency spectra of the two information signals, a first binary-code signal (f.sub.p -f.sub.c) which is phase-modulated on a first code subcarrier situated outside the frequency spectra, which code subcarrier is a harmonic of a subharmonic of the stereo pilot (f.sub.p) which harmonic does not coincide with a harmonic of said pilot (f.sub.p), the multiplex signal, in order to extend the transmission capacity, comprising a second binary-code signal which is phase-modulated on a second code subcarrier (f.sub.p +f.sub.c).

Abstract: A method for driving an ink jet printer which includes an electro-mechanical transducer which is operated by electrical pulses to eject ink from an ink nozzle connected to pressure chamber wherein two successive electrical pulses are supplied to the transducer before the ejected ink is separated from the remaining ink in the pressure chamber.

Abstract: A remote control system connected to subscriber telephone lines serving a premises utilizes telephones to transmit dial-coded command signals to a central control unit where the signals are converted into actuating signals for specified devices elsewhere on the premises. The actuating signals are transmitted as pulse modulated carrier waves through utility power lines serving the premises and the devices, and specifically tuned receivers on the lines detect the appropriate actuating signals and cause an associated device to be actuated. The system also responds to ring pulses from telephones located off the premises and produces the same actuating signals for controlling the devices on the premises from distant stations.

Abstract: A muting circuit for an AM stereophonic receiver of the type that having a detector circuit operating upon an AM stereophonic signal, the carrier of which is phase-modulated by the difference signal of first and second stereo channel signals, for detecting the difference signal. The muting circuit includes a muting signal generating circuit for detecting the output level of the detector circuit exceeding a predetermined value and for generating a muting signal at least for periods when the predetermined value is exceeded, and a muting switch circuit for attenuating the output of the detector in response to the muting signal.

Abstract: A telephone dialing pager providing a visual display of a caller's telephone number and storage of a plurality of telephone numbers of consecutive callers. The stored information data corresponding to each caller's telephone number is recalled for display by the user of the pager and controllably transformed into appropriate dual tone multi frequencies for dialing the callers' telephone numbers.

Abstract: Apparatus for reproducing sound having a realistic ambient field and acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output. A right main speaker and a left main speaker are disposed at right and left main speaker locations, respectively, which are equidistantly spaced from a listening location along a listening axis perpendicular to a line joining the left and right main speakers. A right sub-speaker and a left sub-speaker are respectively disposed at right and left sub-speaker locations equidistantly spaced from the listening location, and further from the listening location than the main speaker. The left and right channel outputs are respectively coupled to the left and right main speakers. A left channel minus right channel difference signal is coupled to the left sub-speaker and a right channel minus left channel difference signal is coupled to the right sub-speaker.