Abstract: An option select scheme (300) and circuit (200) allows a single analog-to-digital (A/D) line (211) to be used between an accessory (204) and a portable radio (202) to control first and second accessory features (234, 236). First and second variable resistive devices (226,228) are used in conjunction with a push-to-talk switch (PTT) (230) to control the first and second accessory features (234, 236). The PTT switch (230) allows the first variable resistive device (226) to present a first voltage range to the A/D line (211) in a first state when the PTT switch (230) is depressed. The PTT switch (230) allows the second variable resistive device (228) along with bias resistor (224) to present a second voltage range to the A/D line (211) in a second state when the PTT switch (230) is not depressed. A third state exists when the accessory (204) is disconnected from the radio (202) and a third voltage range is presented to the A/D line (211).

Abstract: A radio carrier facilitates mounting of a portable radio on a shoulder strap of a golf bag or to a motorized golf cart when desired and is made up of a sleeve-like strap member which can be adjustably secured in surrounding relation to the shoulder strap and a fastener for mounting the radio casing on the strap member so that the radio controls are readily accessible to the golfer when playing the game of golf. A motion detector circuit is provided as a part of the internal radio circuit to automatically control the on/off state of the radio.

Abstract: An electronic device includes a host component having a first antenna; and a radio unit that may be connected to the host component and that has a second, rotatable antenna. The radio unit also includes a switch that is triggered by rotation of the second antenna to activate either the first antenna or the second antenna.

Abstract: A hinge assembly for hingedly connecting a cover and a housing theretogether, such as a keypad cover and a housing of a portable radiotelephone. A generally tubular hinge arm is formed at an end portion of the cover, and two hinge pins, each having identical cam surfaces formed upon edge surfaces thereof are inserted into the hinge arm and positioned such that the cam surfaces of the respective hinge pins extend beyond opposing sides of the hinge arm such that the hinge pins are caused to rotate in unison with rotation of the cover. A spring member is tandemly-positioned between the two hinge pins to exert spring forces thereupon. Two cam followers are affixed to the housing in a manner such that the cam surfaces of the hinge pins abut against the cam followers.

Abstract: A portable voice amplifier includes a casing providing a housing and including a flat base, a curved front wall extending from the base upwardly and over the base, when viewed from the side, to the top of the unit. A speaker is mounted in the lower portion of the curved front wall, and the casing includes a lower section partially formed by the lower portion of the curved front wall and having a progressively narrow depth preceding from the base to approximately the midsection of the casing. An upper section of the housing has generally uniform depth and width from the midsection to the top of the unit. The upper section is designed to be held conveniently by the hand of the user, with a microphone located on the rear of the upper housing section so that in normal use the entire unit extends below the face of the user and is conveniently and comfortably held with a single hand.

Abstract: A main body of a portable radio apparatus is split into an upper box and a lower box, and the upper box is connected to the upper part of the lower box to be rotatable about a hinge section. An antenna is similarly connected to be rotatable on the hinge section. When the lower body is swung open, the antenna is also swung simultaneously. As the antenna can be further swung, the distance between the head of the user and the antenna can be maximized during communication.

Abstract: A communication system to be used between a plurality of individuals with the communication system being mounted in conjunction with head wear. Generally, the individuals are engaged in some type of related activity such as riding bicycles. Within each head wear is incorporated a receiver that is to be located directly adjacent an ear of the user. Also mounted on the head wear of each user is an elongated unit with this elongated unit including a microphone in one end thereof and an antenna at the opposite end thereof. This unit is pivotally mounted on the head wear between an inactive position and a using position. When in a using position, the microphone is located directly adjacent to the mouth of the user. When in the inactive position, the microphone is located in an out-of-the-way position spaced some distance from the mouth of the user.

Abstract: A latch system for a housing includes front and rear housing sections (204, 202) having a common side periphery (212) when assembled. The housing sections (204, 202) include wall segments (208, 206) projecting therefrom. Each wall segment (208, 206) has a locking side (214) adjacent and parallel to the common side periphery (212) and has a recess (402, 210) therein for mating with an elastomeric interlocking band (100). The elastomeric interlocking band (100) includes teeth (102, 103) projecting therefrom for engaging with the recesses (402, 210) in the wall segments (208, 206). To latch together the front and rear housing sections (204, 202) the elastomeric interlocking band (100) is slidably assembled onto the wall segments (208, 206) of a first housing section (204, 202) until the teeth (102, 103) engage with the recesses (402, 210) therein.

Abstract: A clip holder for holding a portable receiver having a front panel, back panel, sides, and a display on the front panel. The clip holder has two members, a receiver holder and a clip plate. The receiver holder and clip plate are attached to opposite ends of a pivot disposed within a cam. The clip plate and receiver holder may be maintained in any position about the pivot because the cam is friction engaged with the receiver holder in all positions. The receiver is engaged to an outer surface of the receiver holder. The clip holder may be attached to a user's belt or waist garment when the belt or garment is located between the clip plate and receiver holder. The clip holder is secured to the user's waist when the receiver holder is fully rotated toward the clip plate so the clip plate and receiver are in a substantially parallel orientation.

Abstract: A direct connect antenna includes a passive patch-type antenna mounted to a radio, wherein the need for and use of a coaxial cable extension arrangement is eliminated. Thus, the characteristic impedances of the load and source can be better matched, resulting in lower reflection and distributed losses. The antenna is formed with guide slots for alignment and simple snap-on connection of the antenna to the radio to prevent coaxial connector mismatch and damage. The radio may be directly affixed and electrically coupled to a PCMCIA compliant interface card which is insertable into a host computer. Accordingly, radio signals received by the direct connect antenna and radio arrangement are processed through the PC card and the computer.

Abstract: An electronic device coupling apparatus is used to couple two electronic devices through a hinge. A first electronic device (221) is disposed within the main housing of a radiotelephone (101). The second electronic device (301) is disposed within a movable element (103) of the radiotelephone (101). The coupling apparatus uses a piece of flex (215) which is torsionally twisted upon the opening of the movable element (103) of the radiotelephone (101). Additionally, the flex (215) is coupled to the electronic devices (221, 301) using an elastomeric connector (217).

Abstract: An assembly and method of assembly for shielding a radio telephone. First and second shields are disposed either side of a circuit board and urged together thereby sandwiching the circuit board. The first shield is relatively rigid compared to the second shield and can cause any deformities in the second shield to be compensated for by the second shield being urged against a rigid first shield, the shields may be removably coupled together which permits simple and quick disassembly if changes or repairs need to be made to the radio telephone.

Abstract: A swimming training device may be part of an overall training system. The device is deployable releasably in a swimming cap and can receive electromagnetic wave signals. The device can then convert the signals into electrical charges which are then translated into audible sound. The system includes the cap with the receiving device and a transmitting source. The transmitting source allows the broadcasting of verbal instructions, as well as music and timing signals.

Abstract: A radiotelephone includes a multifunctional headset that operates in two different modes. According to a first mode, the headset may be mounted on a radiotelephone body where it serves as a speaker and microphone for the radiotelephone. Also, the headset can be separated from the body of the portable radiotelephone and placed on the head of the user. In this mode of operation, the headset receives and transmits signals from and to the radiotelephone body during a call, thus providing hands-free operation. The headset can be attached to a user's head by an ear clip. The headset and body may include low power RF transceivers. The headset may contain power saving circuitry to minimize power drain from an internal battery. The battery may be recharged whenever the headset is fixed to the radiotelephone.

Abstract: A radio communications system includes plural radios with each radio having a microprocessor, a modem, and corresponding automatic number identification (ANI) information as well as a predetermined pattern of tones or digital codes corresponding to a particular radio frequency channel stored in memory. For each transmission, the radio microprocessor encodes the corresponding radio identification data that provides the encoded radio identification data to the radio modem in parallel format. The radio modem converts the encoded identification data into a serial data stream at the same time that the microprocessor is generating the predetermined pattern of tones or digital codes. Thereafter, the generated pattern of tones or digital codes is combined with the serial data stream and simultaneously transmitted over the transmission radio frequency channel.

Abstract: An assembly for visually indicating signals generated by an electrical circuit and a light diffuser therefor. Light emitting diodes disposed upon a circuit board and housed within a housing structure are connected to an electrical circuit and generate light responsive to signals generated by the electrical circuit. A sheet of translucent material having a spine-portion and toothed-portion extending therefrom is positioned upon the circuit board portion at which the light emitting diodes are disposed. Light diffusers comprised of truncated, conical bodies protrude beyond top surfaces of each of the toothed-portions and correspond in number and spacing with the light emitting diodes disposed upon the circuit board. Apertures are formed to extend through the housing assembly and top end portions of the light diffusers are visible from beyond the housing assembly.

Abstract: When a portable radio (110) receives a transmission from a mobile radio (105), the portable radio (110) mutes a speaker volume of the portable radio (110) for a duration of the transmission from the mobile radio (105). In an arrangement of the mobile radio (105) and the portable radio (110) where both radios transmit and receive on a same communication resource channel and both radios are in close proximity, acoustic feedback may be avoided.

Abstract: The antenna element mounting of the present invention enables an antenna to be mounted between the printed circuit boards of a radio instead of along side the boards. The shielding of the printed circuit boards has an indentation along one edge of each shield. When the shields are mated, the indentations form a channel into which the antenna is mounted.

Abstract: A radiotelephone wrist device includes a case having a transceiver and a strap attached to the case for fastening the device to a user's wrist. The strap has a top layer and a bottom layer. The top layer is attached to the bottom layer by a pivot mechanism which facilitates rotating at least a portion of the top layer with respect to the bottom layer. A microphone is located on the strap and electrically connected to the transceiver. A speaker is located at an end of the top layer of the strap and electrically connected to the transceiver. A first antenna is located in the bottom layer of the strap. A second antenna is located in the rotatable portion of the top layer of the strap.

Abstract: A portable radio communication device such as wristwatch receiver and/or transmitter is provided with an effective noise shielding structure. The portable radio communication device includes a high frequency analog circuitry for receiving and transmitting radio signals and further includes digital circuitry for data processing and display. The noise shielding structure protects high frequency noise from being transmitted to the analog circuitry from the digital circuitry and from other outside sources. The noise shielding structure is made of electrically conductive material. In another aspect of the invention, at least one circuit board constructed of a multi-layered construction having at least one inner printed wire pattern is provided. The inner printed wire pattern is set at ground potential with respect to the high frequency output from the analog circuitry. In this manner the inner printed wire pattern serves as a noise shielding member.

Abstract: A portable phone comprises a handset having a low power radio transmitter and a base station having a booster transmitter that is optionally coupled to the handset for better transmission. A docking cradle has a nest to receive a boat and the boat has a pocket to receive the handset. The boat is connected to the base by a cord and a connector in the boat is coupled to the handset when the handset is seated in the boat. The cradle, boat and handset are nested together for compact hands-free operation, the handset is removed from the boat for portable operation, or the handset and boat together are removed from the cradle for wire-connected hand-held operation.

Abstract: A holster assembly for retaining a radio pager or data receiver including a clip fixed to the assembly having a first position for resiliently clamping the holster assembly to an article of clothing and another stable open position for supporting the assembly on a surface as a stand for the pager or receiver, a vibrator alert apparatus and a battery connected thereto contained wholly within a housing formed by the holster assembly.

Abstract: A slim portable radio communication device housing that can be connected to an external input/output connector without removing a battery pack. A fitting mount of a battery pack is rotatably fitted to the radio communication device housing via shafts. The battery pack is detachably fitted to the fitting mount.

Abstract: A readily transportable desk structure is provided for positioning upon a vehicular seat of the bench type. The desk structure preferably takes the form of an tub-like body having a compartment housing transceiver means and a plate-like top covering the compartment with a cover providing access to the compartment. Various means are disclosed for preventing excessive verticle and horizontal movement of the desk stucture during vehicular travel utilizing the vehicle seat belt, the center armrest, the seat cushion and the seat back. A power outlet is provided for utilizing electrically powered accessories with the desk stucture.

Abstract: A device used with a portable radio (10) and associated carrying case (30) which can automatically adjust radio control functions such as audio output, DTMF tone level mode telephone hang-up or illumination levels of the radio depending on the radio's position in relation to the carrying case. The radio (10) includes a hall effect switch (14) used to signal the a microprocessor within the radio when actuated. A magnet (38) located within the case (30) actuates the hall effect switch (14) when the radio (10) is placed within the case (30). The microprocessor is then signaled to change radio function aiding the user in the operation of the radio (10) depending on the its position.

Abstract: A holster (201) serves to protect an information display (202) in a selective call receiver (200) from breakage due to an impact in an area proximate to the information display (202). When the selective call receiver (200) is retained in the holster (201) in a first orientation, a second portion (207) of the holster contiguously covers an opening in the housing where the information display (202) is positioned. The second portion (207) protects the information display by shunting energy from the impact into at least a front section (204) of the selective call receiver's housing and the holster (201).

Abstract: A removable panel has a plurality of operation buttons for operating a car stereo. A cellular telephone system operated by the operation buttons is provided in the panel. A controller is provided in the panel for rendering the car stereo inoperative in response to an instruction received through the cellular telephone system.

Abstract: A telescope-radio receiver assembly, in which a telescope and a radio receiver are built into a single casing, includes a casing made up of an upper half and a lower half as a substantially parallelepipedic hollow member. The casing is formed with a first housing section for housing a telescope section extending along its first lateral surface across two mutually opposite lateral surfaces extending at right angles to the first lateral surface, and a second housing section for housing a radio receiving section fitted with a bar antenna. The second housing unit is extended outward beyond a front side one of the two mutually opposite lateral surfaces extending at right angles to the first lateral surface. The radio receiving section has its bar antenna housed along the front side lateral surface extended beyond the second housing section for achieving good reception sensitivity without being affected by the telescope disposed within the casing.

Abstract: A latch (16) for latching or locking a battery housing (14) to a portable radio housing (12) automatically locks into place when it is placed in the radio, and automatically ejects the battery housing when it is unlocked. The latch is movable from a first position, in which the battery housing is locked to the portable radio, to a second position, in which the battery housing is unlocked from the radio, and movable from the second position to the first position. The latch comprises a spring biasing apparatus (18) for attaching the latch to the housing, retainer apparatus (22) for locking the battery housing to the radio, and a spring finger member (20) for ejecting the battery housing from the radio housing when the latch is moved from the first to the second position.

Abstract: An alarm system for notifying necessary medical and hospital personnel that a patient or the patient's life support equipment require immediate response without providing the alarm signal to the monitored patient or surrounding patients, to prevent patient trauma which may otherwise result from the sound of the alarm. The system includes an alarm signal generator that provides a coded pulse indication of the patient and equipment type. The coded signal is sent to a master control unit preferably located at a nurses' station. The master control unit then transmits the coded alarm signal simultaneously to the appropriate group of pagers having vibrational annunciators and a visual display that describes the patient location and equipment type. The patients monitor and equipment at bedside and the pagers have no audio alarm signals. The alarm signal can only be terminated manually by an interrupt switch at the bedside.

Abstract: A wrist-mounted-type portable radio apparatus includes a main body having a front surface that faces away from the user's wrist, a rear surface that faces the user's wrist when mounted around the user's wrist, a circuit board having electrical circuitry and arranged in the main body, and wrist bands connected to the main body for mounting the device around the user's wrist. The radio apparatus also includes an antenna assembly fixed in the main body and the wrist bands, and arranged in the main body so that it is positioned on a side of the circuit board facing the front surface of the main body. Because the circuit board is not disposed on the front surface side of the antenna assembly, a radiation wave generated by the antenna assembly is not disturbed. Therefore, the wrist-mounted-type antenna device has high directivity and sensitivity.

Abstract: A step counter usable as a pocket paging receiver wherein many parts thereof are used as those of the pocket paging receiver, thereby capable of reducing the cost of manufacture and improving the utility. The step counter includes a control circuit for determining whether input data received in the step counter is data for a radio-paging mode or data for a step-counting mode, storing the input data when the input data is data for the radio-paging mode, sensing the input data as walking data when the input data is data for the step-counting mode, accumulatively counting the number of steps, and storing the resultant value, determining whether the step counter operates in the radio-paging mode or the step-counting mode, and transmitting the stored data corresponding to the determined mode to a display equipped in the step counter.

Abstract: A wrist mounted electronic device, including a loop antenna embedded within a single-injection molded, multiple-segment wristband, has an electrically conductive, obtusely angled mounting bracket disposed between an embedded antenna and the electronic device. The mounting bracket has at least one screw hole to facilitate attachment of the wristband segments to the electronic device. The embedded antenna has a plurality of round holes therethrough.

Abstract: A survival radio for use for transmitting and receiving information for search and rescue having an improved structural housing assembly for increased reliability to prevent moisture and water intrusion, while permitting use of the device in any ambient air pressure. The housing assembly includes a tongue and sealed groove connections joined by deforming the tongue in a pliable state, housing assembly apertures covered by a deformable flexible sealable plastic panel to permit manual actuation of internal switches and an air vent that has a porous plug permitting air pressure equalization between the inside and outside of the housing assembly, while preventing water intrusion.

Abstract: This invention is directed to a PCMCIA Type II memory card holder assembly for a spread spectrum radio communication card that provides radio frequency interference shielding, electrostatic discharge resistance and heat dissipation. The card holder assembly consists of a multilayer circuit board and a card holder. The multilayer circuit board has a ground plane disposed between a plurality of analog circuit layers and a plurality of digital circuit layers. The ground plane is connected by through vias to ground traces on the surfaces of the circuit board. The card holder consists of a card holder frame in which the memory card is slidably and rotatably mounted so that the ground traces continuously contact the frame, and two outer cover plates which are adhered to the opposing surfaces of the card holder frame.

Abstract: A class 1 cellular mobile telephone apparatus has an LCD display and keypad provided in a transceiver main unit, which can be installed directly in a passenger compartment of a motor vehicle. The handset unit contains only a speaker and a microphone, eliminating the need for a microprocessor and associated supporting circuitry. The additional space within the handset is utilized for placement of a battery pack power supply for transportable operation of the apparatus. The apparatus is smaller, simpler and lighter in weight than conventional class 1 cellular apparatus.

Abstract: A compact portable cellular telephone extension that provides additional electronic functions is implemented in a case attachable to a first external surface of the cellular phone to form a physically integral unit. A connector is supported by the case and couples the extension electronics to the cellular phone electronics. The connector connects through a second external surface of the cellular phone that lies in a plane different from the plane of the first external surface. A speaker arm extends from the case and supports a speaker unit. The speaker arm is positionable in a first position adjacent a third external surface of the cellular phone and in a second position away from the third external surface allowing the case to be readily attached and detached.

Abstract: A baby monitor receiver in the form of a wristwatch. A holder including a stand and cradle is provided for the receiver so that it may be stood on a flat surface or clipped to the clothing of the person attending to the baby.

Abstract: A selective calling receiver includes a selective calling receiver main body, a chain clip, a detection circuit, and a control circuit. The selective calling receiver main body has a notification unit for performing a notifying operation when a numerical signal is received The chain clip includes a conductive metal chain and has one end connected to the selective calling receiver main body and the other end connected to a clip. The detection circuit is arranged in the selective calling receiver main body and is electrically connected to the chain clip to detect that a user touches a portion of the chain clip. The control circuit is arranged in the selective calling receiver main body and stops the notifying operation of the notification unit when an output is generated by the detection circuit in a notification enable state.

Abstract: A hinge configuration particularly suitable for use with a radiotelephone includes: an arcuate hinge body having a predetermined body length, a predetermined body thickness and a predetermined radius of curvature; and a pair of arms, a respective one of which is attached to and extends away from a respective end of the arcuate hinge body, the pair of arms each having predetermined arm lengths and predetermined arm thicknesses. The arms are pivotally mounted on a housing such that the arms twist upon pivotal movement of the arcuate hinge body relative to the housing. At least one of the predetermined body length, predetermined body thickness, predetermined radius of curvature, predetermined arm lengths and predetermined arm thicknesses should be selected to induce preferential deflection in the arcuate hinge body relative to the pair of arms upon twisting thereof during pivotal movement of the hinge body so that the arms resist fracture during such repeated pivotal movement.

Abstract: A heat seal connector (100) includes a flexible substrate (105), interconnects (110) disposed thereon, and a parting agent (115) contiguous with the flexible substrate (105) for preventing the heat seal connector (100) from adhering to a heating platen (505) applied thereto, wherein the heating platen (505) does not include a parting agent for preventing the heat seal connector (100) from adhering to the healing platen (505). The heat seal connector (100) is bonded to first and second electronic circuits (415, 420) during application of the heating platen (505) such that the interconnects (110) electrically couple conductive pads (417) formed on the first electronic circuit (415) to corresponding conductive pads (425) formed on the second electronic circuit (420).

Abstract: A selective calling receiver comprises two separate bands having an antenna circuit for tuning incorporated therein. The first band has a first antenna and tuning capacitors incorporated therein and stoppers formed and arrayed on the outer surface thereof. Predetermined points are provided to the first antenna, providing different effective antenna lengths, respectively. The respective stoppers are provided with electrodes which are connected to the predetermined points of the first antenna through the tuning capacitors, respectively. The second band has a second antenna and a hook. The hook can be engaged with a selected one of the stoppers of the first band depending on the user's wrist thickness. The hook comprises a conductor electrically connected to the second antenna. When engaged with a selected one of the stoppers, the hook brings into electrical contact with the corresponding electrode to form the antenna circuit.

Abstract: A novel communications system for the game of football allows the quarterback to be heard by his teammates over crowd noise. The communications system comprises a plurality of loudspeakers positioned on opposite sidelines of the playing field in the approach to the goal lines at each end of the field, preferably between the 10 and 20 yard lines. The speakers are aimed or focused at ground level toward the players for selective use whenever the crowd noise is excessive as the team is approaching the goal line. A receiver and amplifier and appropriate circuits are associated with the speakers. A small microphone, transmitter and switch are carried by the quarterback, preferably on his helmet and the safety padding, i.e., shoulder pads.

Abstract: A radio communications system includes plural radios with each radio having a microprocessor, a modem, and corresponding automatic number identification (ANI) information as well as a predetermined pattern of tones or digital codes corresponding to a particular radio frequency channel stored in memory. For each transmission, the radio microprocessor encodes the corresponding radio identification data that provides the encoded radio identification data to the radio modem in parallel format. The radio modem converts the encoded identification data into a serial data stream at the same time that the microprocessor is generating the predetermined pattern of tones or digital codes. Thereafter, the generated pattern of tones or digital codes is combined with the serial data stream and simultaneously transmitted over the transmission radio frequency channel.

Abstract: A portable radio device includes a radio device main body, a man-machine interface unit, a first interface unit, a fixing adaptor, and a cord. The radio device main body has a radio unit for transmitting/receiving a radio speech signal and a control unit for controlling a signal transmitting/receiving operation of the radio unit. The man-machine interface unit has a telephone transmitter unit and a telephone receiver unit, which are used for speech communication, and is detachably coupled to the radio device main body. The first interface unit electrically connects the radio device main body to the man-machine interface unit in a coupled state. The radio device main body is detachably mounted on the fixing adaptor. The fixing adaptor supplies power to the radio device main body in a mounted state of the radio device main body. The cord is detachably connected to the man-machine interface unit and electrically connects the man-machine interface unit to the radio device main body through the fixing adaptor.

Abstract: A latch for affixing a clip (102) onto a housing (104)that encloses a portable electronic device. The latch, integrally molded with the clip (102), comprises a bar (208) disposed within an aperture (210) having a circumferential edge (212). The bar (208)includes a stub extrusion (214) that is disposed distally and perpendicularly at an unaffixed first end (216), and connects to the circumferential edge (212) at an affixed second end (218). Reinforcing the bar (208) and the stub extrusion (214)laterally on a first side (224)is a first flange (220). A second flange (222) reinforces the bar 208 laterally on a second side (226) that is opposite to the first side (224). The stub extrusion (214) affixes the clip to the housing by engaging a catch extrusion (110) and a slot (112) disposed on the housing (104).

Abstract: The invention relates to a hands-free module (2) for a mobile telephone (1). The hands-free module comprises a housing (11) and a cord (13) extending therefrom. Connected to the end of the cable distal from the housing is an external phone unit (14) and an external microphone (15). Mounted on the module is a connector (12) which connects the module housing (11) mechanically to the telephone housing (3) and which also connects the external phone unit (14) and the external microphone (15) electrically to the respective circuits of the internal loudspeaker and the internal microphone of the mobile telephone. The choice between the external and internal microphones is effected by a switch.

Abstract: A transmitter-receiver comprises a transmitter, a transmitter circuit, a receiver circuit, a receiver, a jack, and a switch. The transmitter circuit converts a first audio signal to a transmit signal and transmits the transmit signal. The receiver circuit extracts a second audio signal from a received signal. The jack is adapted to be connected with a plug of an external transmitter-receiver. The switch is on/off controlled dependent on whether or not the jack of the external transmitter-receiver is connected with the plug. The switch, when the jack is not connected with the plug, supplies the first audio signal from the transmitter to the transmitter circuit and also supplies the second audio signal from the receiver circuit selectively to the receiver.

Abstract: A detector for determining the validity of a received code, such as a Digital Supervisory Audio Tone (DSAT) code. A received DSAT code is serially shifted into a shift register (10) which outputs the received DSAT code in parallel format to a set of 24 exclusive-OR gates (12). Another shift register (11) receives a valid code, such as a valid DSAT code. The register (11) outputs the valid DSAT code, and right circular shifted (rotated) versions of the valid DSAT code, to the gates (12). The comparison signal from the gates (12) is provided to another register (13) and a counter (16) which together count the number of mismatches between the received DSAT code and the reference DSAT codes. The output of the counter (16) is provided to a comparator (17) which compares the number of mismatches against the allowable number of mismatches. The output of the comparator (17) is a validity signal (7) which indicates whether the received DSAT code matches any of the reference DSAT codes.

Abstract: A casing for a waterproof type includes a cover 1, a battery cover 2, an elastic packing 3, and an inner cover 4. The cover 1 has a battery accommodation section 10. The battery cover 2 closes an opening 11 of the battery accommodation section 10. The elastic packing 3 is disposed along the opening 11. The inner cover 4 closes the opening 11 in close contact with the packing 3. The battery cover 2 is locked to the cover 1 in a state with the inner cover 4 urged against the opening 11 by sliding the battery cover 2 in a direction different from the direction of urging the packing 3 against the opening 11.