Abstract: In a telephone interface circuit, a first NPN transistor switch-controls a connection between a speech circuit and a pair of subscriber lines. A second PNP transistor controls an on/off state of the first transistor. A positive feedback circuit connects a collector terminal of the first transistor to a base terminal of the second transistor. An internal power source supplies current for driving the second transistor. The first transistor operates in a saturated region when a voltage that is in a range of standard voltages delivered over a pair of subscriber lines for normal operating conditions of a subscriber line device that is not being subjected to an over-voltage or an over-current event is applied in between the pair of the subscriber lines. The first transistor operates in an unsaturated region when an overvoltage exceeding said range of standard voltages is applied in between the pair of the subscriber lines.

Abstract: A hook switch turns on a transistor by connecting the positive electrode terminal of a capacitor to a base terminal of a transistor in an off-hook state, causing a speech circuit and telephone lines to be connected. The hook switch turns off the transistor by disconnecting the positive electrode terminal of the capacitor from the base terminal of the transistor in an on-hook state, causing the speech circuit and the telephone lines to be disconnected. A holding circuit holds the voltage at the positive electrode terminal of the capacitor at a substantially fixed value by charging the capacitor with electric power supplied from the telephone lines in an off-hook state.

Abstract: A telephone interface circuit comprising a speech circuit, a control circuit turning on upon receiving a supply of a forward direction trigger current so as to connect first and second telephone lines and the speech circuit, and going off upon receiving a supply of a reverse direction trigger current so as to disconnect the first and second telephone lines and the speech circuit, a capacitor charging and discharging charge supplied from the first telephone line, and a hook switch supplying charge accumulated at the capacitor when off-hook to the control circuit as a forward direction trigger current, and supplying charge discharged from the capacitor when on-hook to the control circuit as a reverse direction trigger current.

Abstract: A telephone interface circuit comprises a first transistor for controlling opening and closing between a speech circuit and subscriber lines, a second transistor for controlling the first transistor to turn on and off, a positive feedback circuit connecting a collector terminal of the first transistor and a base terminal of the second transistor, an overcurrent detection circuit detecting overcurrent applied to the subscriber lines, and a breaker circuit for turning off the first transistor by lowering the base potential of the second transistor to a low potential when overcurrent is detected at the overcurrent detection circuit. Here, the base terminal of the first transistor and a collector terminal of the second transistor are connected. Further, when off-hook, the base potential of the second transistor is controlled in such a manner as to become a high potential by a microcomputer.

Abstract: A prediction signal calculator with a limit function is provided with a multiplier calculating a partial prediction signal composed of the product of a polar prediction coefficient for generating a regenerative signal and a quantized regenerative signal, a display conversion section for converting the partial prediction signal from floating point representation to an absolute value display, and a limiter executing processing for substituting limit values in the partial prediction signal satisfying overflow conditions during conversion of the partial prediction signal from floating point representation to an absolute value display in the event that the error detector determines that there are code errors in the audio data for a predetermined number of frames of the audio data.

Abstract: A prediction signal calculator with a limit function is provided with a multiplier calculating a partial prediction signal composed of the product of a polar prediction coefficient for generating a regenerative signal and a quantized regenerative signal, a display conversion section for converting the partial prediction signal from floating point representation to an absolute value display, and a limiter executing processing for substituting limit values in the partial prediction signal satisfying overflow conditions during conversion of the partial prediction signal from floating point representation to an absolute value display in the event that the error detector determines that there are code errors in the audio data for a predetermined number of frames of the audio data.

Abstract: A telephone interface circuit comprises: a first transistor which switch-controls a connection between a speech circuit and a pair of subscriber lines; a second transistor which controls an on/off state of the first transistor; a positive feedback circuit which connects a collector terminal of the first transistor to a base terminal of the second transistor; and an internal power source which supplies current for driving the second transistor. A circuit constant is set such that the first transistor is to operate in a saturated region when a voltage in a range of voltage for normal use is applied in between the pair of the subscriber lines, and such that the first transistor is to operate in an unsaturated region when an overvoltage exceeding the range of voltage for normal use is applied in between the pair of the subscriber lines.

Abstract: A digital camera enabling a photographer to select representative frames reflecting his intentions, which captures both moving pictures and still images, and encodes moving picture data by frame correlation compression. The camera includes an image processing section that increases the number of I pictures in compressed moving picture data captured before, or before and after, a still image recording (SIR) instruction is received during moving picture acquisition. By this arrangement, continuous image data can be buffered for a fixed time period, and when a SIR instruction is given, this image data can be compressed and recorded as I pictures with the data being traced back for a fixed time period. As a result, image data further in the past by a fixed time period than the time at which the SIR instruction is given can be acquired as I pictures, enabling the user to select intended representative frames.

Abstract: A signal processing device includes: a speaker amplifier for amplifying a reception voice; a reception voice attenuator for attenuating the reception voice inputted to the speaker amplifier during a voice transmission mode; a reception voice detection circuit for detecting the reception voice outputted from the speaker amplifier; a microphone amplifier for amplifying a transmission voice inputted to a microphone; a transmission voice attenuator for attenuating the transmission voice outputted by the microphone amplifier during a voice reception mode; a transmission voice detection circuit for detecting the transmission voice outputted by the microphone amplifier; and a discriminator for discriminating the mode to be operated among the voice transmission mode and the voice reception mode on the basis of detection outputs from the reception voice detection circuit and the transmission voice detection circuit.

Abstract: A repeater amplifies and relays radio waves sent and received between a base station and a mobile station. The repeater includes an evaluation function calculator which, with the base station and one or more other repeaters serving as communication partners, calculates an evaluation function for evaluating the state of communication between the communication partners and the repeaters, for each of the communication partners; and a processing device which automatically determines to which of the communication partners a link is to be made on the basis of the evaluation function.

Abstract: Provided is an interterminal connection structure capable of eliminating the precipitate adhering to the terminal with the installation operation, securing the electrically connected state of the terminal between a pair of members, and easily accommodating to design changes in the spring load. In a cordless handset of a domestic telephone, the conductive state of the terminals employed in the electrical connection between this cordless handset and battery charger is made to contact in a mutually intersecting manner, and, in addition, the terminal on the battery charger side is made to rotate and move pursuant to the installation operation of the cordless handset, and the contact position is gradually moved while maintaining this contact state via such rotating movement. Thus, even if there is a precipitate on the terminals, such precipitate will be chipped off due to the contact movement (sliding), and a loose connection can thereby be prevented.

Abstract: A cordless telephone handset that does not affect the use of a magnetic pick-up type hearing aid. The cordless telephone handset includes a TDD processing section for controlling transmission and reception by means of TDD communications, and a suppressing device for suppressing variations in the magnetic field generated by the TDD processing section. By suppressing variations in the magnetic field generated by the TDD processing section, the problem of magnetic field variations being picked up by a magnetic pick-up type hearing aid and being output as noise, is overcome.

Abstract: A broadband receiver exhibiting reduced interference to a frequency counter caused by a local oscillator.

Abstract: A voice communication apparatus includes a primary modulator configured to perform primary modulation of a carrier with a center frequency outside a voice band by an analog voice signal; a PN-code generator configured to convert data into a PN code; an adder configured to add data included in the voice band and the primary-modulated voice signal; and a secondary modulator configured to perform secondary modulation of the PN code included in the voice band and the primary-modulated voice signal. According to the voice communication apparatus, an analog voice signal can be directly spread.

Abstract: A signal processing device includes: a speaker amplifier for amplifying a reception voice; a reception voice attenuator for attenuating the reception voice inputted to the speaker amplifier during a voice transmission mode; a reception voice detection circuit for detecting the reception voice outputted from the speaker amplifier; a microphone amplifier for amplifying a transmission voice inputted to a microphone; a transmission voice attenuator for attenuating the transmission voice outputted by the microphone amplifier during a voice reception mode; a transmission voice detection circuit for detecting the transmission voice outputted by the microphone amplifier; and a discriminator for discriminating the mode to be operated among the voice transmission mode and the voice reception mode on the basis of detection outputs from the reception voice detection circuit and the transmission voice detection circuit.

Abstract: A telephone interface circuit has a first transistor for opening and closing a connection between a speech circuit and a pair of subscriber lines, a second transistor for controlling ON/OFF states of the first transistor, and a positive feedback circuit for positively feeding back, to a base terminal of the second transistor, a part of collector current flowing through the first transistor. A circuit constant is set such that when normal use voltage is applied to the pair of subscriber lines, the second transistor operates in a saturation region, and when voltage exceeding the normal use voltage is applied to the pair of subscriber lines, the second transistor operates in a non-saturation region.

Abstract: A method for interpolating image data captured by an electronic imaging device having a Bayer arrangement, by pixel interpolation involving interpolating interpolation pixel X33 (a green pixel), determining the average value of the neighboring pixels situated peripherally to the interpolation pixel X33 by equation (1), and determining the median values of the green pixels in the horizontal direction, the oblique direction and the reverse oblique direction including the interpolation pixel X33 by equations (2), (3) and (4), respectively: ave=(G22+G24+G42+G44)/4; ??(1) horiz=median(G31, (G22+G42)/2, (G24+G44)/2, G35); ??(2) Slash=median(G15, G24, G42, G51); and ??(3) Bslash=median(G11, G22, G44, G55). ??(4) The value of these median values having the smallest differential with respect to the average value is taken to be the pixel data for the green pixel situated at the position of X33.

Abstract: A hook switch turns on a transistor by connecting the positive electrode terminal of a capacitor to a base terminal of a transistor in an off-hook state, causing a speech circuit and telephone lines to be connected. The hook switch turns off the transistor by disconnecting the positive electrode terminal of the capacitor from the base terminal of the transistor in an on-hook state, causing the speech circuit and the telephone lines to be disconnected. A holding circuit holds the voltage at the positive electrode terminal of the capacitor at a substantially fixed value by charging the capacitor with electric power supplied from the telephone lines in an off-hook state.

Abstract: A digital wireless communications device enabling call distance to be increased while avoiding mute processing as far as possible, even if code error occurs in an ADPCM code. The digital wireless communications device may be configured to include: an error detector for detecting code error in an ADPCM code received via a wireless circuit; an ADPCM decoder for generating a PCM signal by decoding the ADPCM code; and a substitution unit for determining that a click noise is generated if the high-speed scale factor and the low-speed scale factor determined by the ADPCM decoder within a predetermined time period after the error detector has judged that there is a code error in the ADPCM code, and the received ADPCM code itself, respectively exceed prescribed threshold values, and for substituting the ADPCM code with a predetermined prescribed code.

Abstract: A mobile station includes a timing controller for adjusting a frame transmit timing so that a unique word detection position at a base station is always located on a predetermined position. Even when frequent changes in the distance between the base station and mobile station occur due to movement of the mobile station, synchronization between the stations can be established, and this synchronization can be maintained.