Abstract: An apparatus to effect coverage of a hearing aid housing received within a cavity of the sock housing to effect filtration of various airborne contaminants. A modification of the invention includes hair filaments arranged and mounted to the sock structure to effect coverage of the sock member and its camouflage.

Abstract: A pay telephone message system is disclosed that includes a voice message system storing and forwarding to a destination telephone a voice message left by a user. Call information including the destination telephone number is routed out-of-band, that is, in a data or service request channel separate from the voice channel, over a packet concentrator network separate from the voice telephone network. During operation a message telephone call is placed to the voice message system over the existing telephone network. The call information is routed over the concentrator network as a voice message service request. The voice message system returns a token, a call identifier or service request number, corresponding to the service request to the pay telephone interface making the request and handling the pay telephone call. The interface sends the token in-band over the telephone network to the voice message system prior to allowing the pay telephone user to store a message.

Abstract: A hearing aid with a microphone, with at least one amplifier fed with the signals from said microphone, whereby the amplifier cooperates with a filter of a higher order for influencing the frequency response, and with a loudspeaker which transforms the amplified signals into soundwaves. This filter (3) can be arranged in the conventional manner between two amplification stages or in the feedback loop of the amplifier (6). In order to allow the optimal adjustment of the frequency response to the respective requirements it is provided in this hearing aid that the filter (3) is arranged as a multiple filter with a biquadratic structure and comprises at least two integrators and an inverting amplifier, whereby the active elements of their components are formed by transistors, preferably single transistors (T1, T2, T3). The feedback loop of the amplifier (6) is guided through an adjustable potentiometer (R.sub.

Abstract: A text mail system in which a pseudo destination subaddress randomly generated at a call receiver side at the time of receiving an incoming call from an integrated services digital network is used to manage the storing or reading out operation of various sorts of messages in a mail box. The text mail system, which uses the pseudo destination subaddress as a box number based on the property that the pseudo destination subaddress is randomly given for each incoming call, can secure a high mail confidence.

Abstract: A dual mode cellular radio communication apparatus includes an echo canceller which cancels echo signals caused by acoustic coupling between a hands-free microphone and a loudspeaker in both analog mode and digital modes. An analog-to-digital converter and digital-to-analog converter may be used both in an analog mode and in a digital mode. A second analog-to-digital converter and a second digital-to-analog converter may be selectively used in the analog or digital mode. The echo canceller may be rendered inoperative during hand-set operation. In addition, a bypass circuit may be provided between an input and an output of the echo canceller so that the echo canceller is bypassed.

Abstract: A dual mode cellular cordless portable radiotelephone preferentially selects the cordless base station over the cellular system when in range of the cordless base station. When the cordless cellular portable is operating in the cellular mode, the radio channel associated with the cordless base station is sampled for a predetermined time. When a signal on the sampled cordless base station channel is detected, the cordless portable moves to the cordless mode and remains in the cordless mode for as long as the signal quality of the signal on the cordless base station channel exceeds a predetermined value.

Abstract: A loudspeaker system includes a housing (1) having therein at least one loudspeaker (3) which divides the volume of the housing into two parts (V.sub.1, V.sub.2). The first volume (V.sub.1) is coupled, via an aperture in the housing (1), to an acoustic tube (5) which includes a damping element (6). The first volume part (V.sub.1) has a smaller volume than the second volume part (V.sub.2). The damping element is in the form of a Helmholtz resonator.

Abstract: A method and system for enhanced data transmission within a cellular telephone system having multiple assigned voice channels separated by adjacent buffer voice channels. A data processing terminal is utilized to divide the data stream into multiple relatively short data packets which are then sequentially transmitted within alternate adjacent buffer voice channels. By switching from one adjacent buffer voice channel to a subsequent adjacent buffer voice channel, in a predetermined and repetitive order, as each data packet is transmitted, the amount of interference experienced in any one assigned voice channel is minimized. Synchronization between adjacent data packets may be achieved by either utilizing adjacent buffer voice channels in a predetermined and repetitive order or by concatenating an indication of the next buffer voice channel utilized with each data packet. A synchronization packet may also be included with each data packet to permit synchronization between adjacent data packets at the receiver.

Abstract: A device for providing an orderly shut-down of a system of interconnected traffic lights upon loss of its primary electrical power is disclosed. A device for permitting consistent reapplication of power to a line conditioner having a ferroresonant transformer is also disclosed. Further, a battery charger for charging a battery system including a plurality of battery cells coupled in series is disclosed. Additionally, a device for determining proper operation of a power transistor by monitoring its saturation voltage and emitter current is also disclosed. Finally, a device for generating a first alternating signal in-phase with a separately generated second alternating signal is disclosed.

Abstract: A base station controller (BSC) personal communications network (PCN), which can for example be based on GSM, has associated with it a local PSTN network and is such that local calls between mobile subscribers and the local PSTN network can be made without involving a remote mobile-services switching centers (MSC), thereby permitting a cheap local call tariff to be employed whilst preserving the interfaces e.g. the GSM Abis and A interfaces. The BSC is intelligent and includes a BSC function, a local MSC function and a location register which slaves mobile subscriber location information from the MSC location registers.

Abstract: A facsimile apparatus having an automatic facsimile/telephone switching function, comprises detecting unit for detecting a high layer compatibility included in a setup message of an ISDN and control unit for immediately connecting the facsimile apparatus to a distant station when the high layer compatibility is indicating a facsimile apparatus. Thereby, in the case where the high layer compatibility is FAX, the FAX is immediately connected to the telephone line. Hence, the waste of time and wasteful bell sound can be eliminated.

Abstract: An AM stereo input signal is processed by an envelope detector, an in-phase detector and a quadrature phase detector to yield outputs which may carry short noise impulses. Each output is low pass filtered to derive an average signal level and each output is ratiometrically compared to the corresponding average to detect a tic or modulation substantially above the average. In response to a tic a hold circuit generates a flag for a period which depends on the quality of the input signal. A dual mode deemphasis and sample/hold circuit normally filters the audio signal in each channel and is effective for the duration of the flag to hold the existing signal in the circuit to blank out the noise impulse.

Abstract: A method and means of automatically accessing several types of radio systems is described. The present invention allows a subscriber unit, which is normally operative in a operator selected radio system, to establish communication with an alternate system if a operator selected system cannot be found. The alternate system may be a conventional single channel mobile relay system or trunked radio system in which the subscriber is authorized to operate. Once communications are established with an alternate communication system, the present invention will periodically attempt to establish communication with the operator selected system while simultaneously attempting to be assigned a higher priority channel in the alternate communication systems according to a priority scan list. Further, the present invention will automatically ignore certain channels which are dedicated for car-to-car use.

Abstract: A cellular mobile station is operable in a telephone mode and a time data display mode. During the time display mode, the station constantly receives an area identifying code transmitted from a cellular mobile communications system. On crossing a boundary between adjoining cell-site areas, a time difference value is entered from a keypad into a location of a memory corresponding to the received code. This process is continued on a learning basis to store as many time difference values into the memory as there are cell-site areas along the route of a journey. Following the learning process, the station constantly receives an area identifying code and recalls one of the stored time difference data from the memory corresponding to a code received on crossing a boundary and modifies displayed timepiece data with the recalled time difference.

Abstract: A cellular radio telephone system comprises a mobile cellular telephone (1) adapted to have a hand portable telephone (2) containing a number assignment module, i.e. a NAM (7), removably connected thereto. The mobile telephone (1) has a microprocessor (4) which can access the information stored in the NAM (7) of the hand portable telephone (2) either directly or via a memory 16 whereby the mobile automatically assumes the telephone number of the hand portable telephone when the two telephones are connected together. Hence a subscriber need only have a single billing account for both telephones. Also, the same mobile telephone may be used as a host at different times by any number of subscribers having their own hand portable telephones. Each subscriber will be able to receive his own calls and the charges for using the system can be levied to the appropriate subscriber's account.

Abstract: A curved apparatus which remains stable when placed on a substantially flat surface is shown which has a base portion with an arcuately shaped back surface capable of resting on the substantially flat surface, a hinge rotatably fixed to the base portion, and a cover secured to the hinge and rotatable therewith, to prevent rocking of the base portion when the base portion's front surface is touched while the base portion is resting on the substantially flat surface. Other devices and systems are also disclosed.

Abstract: A contact transducer assembly for an electromagnetically driven hearing device such as a hearing aid or other audio signal reproducing device worn by a user is described. The contact transducer assembly includes a transducer which is attached to a biocompatible support. This assembly is supported on the tympanic membrane of the wearer by surface adhesion, such that it can be readily inserted and removed in a manner similar to that of a conventional contact lens worn on the eye.

Abstract: This invention contemplates the provision of a noise immune integrated circuit receiver in which the voltage reference to one side of an emitter-coupled current switch moves in response to the input signal, in a direction opposite the input signal. This provides the gate with a threshold hysteresis, making it immune to noise without requiring a large swing in input signal.

Abstract: A telephone holder which can be secured to either the vertically extending side wall of a conveniently located item or a horizontally extending upwardly facing wall thereof, on which a telephone can be held for easy reach by a user. The holder includes a base plate on which the telephone is secured, an elongated vertically extending mounting plate integrally joined to the base plate along a side edge and extending substantially normal thereto, a pair of spaced apart horizontally extending mounting plates integrally joined to the base plate along its lower edge and extending substantially normal to the base plate in one direction therefrom, and another horizontally extending mounting plate integrally joined to the base plate along its lower edge in the space between the pair of spaced apart horizontally extending mounting plates, also extending substantially normal to the base plate but in the opposite direction therefrom.

Abstract: A portable-to-portable call transfer system for cordless telephone. The base unit is connected with a portable unit over a radio channel. The call-transfer requesting signal relay responds to a transfer requesting signal from a calling portable unit to hold an incoming call while also transmitting both the transfer requesting signal and the channel number of a talk channel to a called portable unit over a control channel. The portable-to-portable line setting section transmits the off-hook signal to the calling portable unit over the talk channel and connects the receiver output of a transmitter-receiver to the transmitter input of the transmitter-receiver so as to enable the calling portable unit to send a voice message to the called portable unit upon reception of an off-hook signal from the called portable unit.