Abstract: [PROBLEMS] To provide an image compression method capable of performing compression with different image qualities within an image. [MEANS FOR SOLVING PROBLEMS] In a mosiac processing unit (16), area division means (130) divides input image data into a plurality of filtering areas and at least some of the filtering areas are subjected to unification processing for each of the filtering areas by a filtering unit (131). On the other hand, a JPEG encoder (17) divides the image data after the mosiac processing into a plenty of rectangular block areas and each of the block areas is subjected to the DCT processing and quantization processing. Here, the filtering area consists of adjacent one or more than one sets of rectangular areas consisting of two or more pixels obtained by equally dividing the aforementioned block area by 2n (n is a natural number).

Abstract: A device for detecting a resonant frequency comprises a sound source, a switch, a mixer, and a sound meter. The switch and mixer are capable of switching between a first state in which the switch and mixer output a measurement signal and a second state in which the switch and mixer output a synthesized signal containing the measurement signal and the signal output from a microphone. The device detects the resonant frequency based on comparison between the first amplitude frequency characteristic measured in the first state and the second amplitude frequency characteristic measured in the second state.

Abstract: A receiving unit (2) receives a modulated signal resulting from modulating a carrier signal with a digital encoded train resulting from error-correction encoding a digital signal train. A demodulating unit (4) demodulates the digital encoded train from the received modulated signal. A decoding unit (8) decodes the digital signal train from the demodulated digital encoded train. The receiving unit (2) outputs a received-signal strength indicative signal indicative of the received-signal strength of the modulated signal. During demodulating, a bit error rate computing unit (18) of the decoding unit (8) computes a bit error rate. The received-signal strength indicative signal and the bit error rate are inputted to a control unit (14), and, on the basis of these inputs, it is judged which one of the receiving conditions defined by received-signal strength indicative signals and bit error rates, the current receiving condition corresponds to.

Abstract: A howling margin measuring device 20 comprises processing means 28 composed of gain controlling means 21 and a compressor 22 which are connected in series and controlling means 23. The gain controlling means 21 outputs an input sound signal after giving a gain thereto. If the level of a sound signal input to the compressor 22 is equal to or higher than a threshold level, the compressor 22 outputs the sound signal after compressing it with a specified ratio. The controlling means 23 is capable of controlling the gain of the gain controlling means 21 and reading the compression level of the compressor 22.

Abstract: Receiving antennas 2a, 2b receive a digital modulated signal from a digital wireless microphone. The digital modulated signal comprises a carrier signal modulated with successively generated digital signal trains. A changeover switch 4 selects one of the antennas 2a, 2b in response to a selection signal. A high-frequency unit 8, a demodulating unit 10 and a decoding unit 12 receive and demodulate the digital modulated signal received by the selected antenna. Analog comparators 24a, 24b compare a reception level indicative signal from the high-frequency unit 8 with threshold values, and a diversity judging unit 28 changes the selection signal in accordance with the comparison result. The digital signal trains comprise a plurality of successive frames, and each frame includes an information data section, a preamble section preceding the information data section for establishing synchronization of the information data section, and a guard bit section succeeding the information data section.

Abstract: A wireless microphone communication system 1 comprises one or more controllers 21 to 24 having LAN interfaces, one or more receivers 11 to 18 having the LAN interfaces and being configured to receive a radio wave from a transmitter of a wireless microphone. The one or more receivers 11 to 18 are coupled to the one or more controllers 21 to 24 on LAN. Each controller 21 to 24 is coupled to a corresponding display device. Each controller 21 to 24 receives, from the one or more receivers 11 to 18, information of the receiver through the LAN. Each controller 21 to 24 causes the received information of the receiver to be displayed on the corresponding display device.

Abstract: A sound wave guide structure for a speaker system comprises a sound passage space connecting an inlet opening 11 to an outlet opening 12. The sound passage space branches in plural stages in a range from the inlet opening 11 to the outlet opening 12, thereby forming a plurality of sound wave guide paths extending from the inlet opening 11 to the outlet opening 12.

Abstract: A wireless microphone communication system 1 comprises a transmitter 91b of a wireless microphone and a receiver 11 for the wireless microphone. The transmitter 91b of the wireless microphone includes an infrared interface 91c, a control portion 91d, and a function control portion 91e that controls a function of the wireless microphone. The control portion 91d controls the function control portion 91e according to information transmitted through the infrared interface 91c. The function of the transmitter 91b of the wireless microphone is controlled under this control. The receiver 11 of the wireless microphone has the infrared interface 11c. The receiver 11 of the wireless microphone sends, through the infrared interface 11c, information in the form of the infrared signal to control the function of the transmitter 91c of the wireless microphone.

Abstract: Resonant frequencies f2 and f3 detected in a resonant space are determined as center frequencies of a dip. Based on measurement values at a speaker and a microphone in the resonant space, a basic amplitude frequency characteristic Ca and a target amplitude frequency characteristic Cd are found. A smoothness degree on a frequency axis is larger in the target amplitude frequency characteristic Cd than the basic amplitude frequency characteristic Ca. A damping level and quality factor of the dip are determined based on a difference between the basic amplitude frequency characteristic Ca and the target amplitude frequency characteristic Cd in the center frequencies f2 and f3 of the dip and frequencies near the center frequencies.

Abstract: An auxiliary mounting device 10 for an in ceiling speaker system comprises a ceiling reinforcing element 11 and an elongate element 21. The ceiling reinforcing element 11 includes a flat plate portion 12 and a vertical portion 14 provided to extend vertically from the flat plate portion, 12. The vertical portion 14 is capable of being in a slidable state in which the vertical portion 14 is vertically slidable and in a fixed state in which the vertical portion 14 is fixed so as not to vertically displace.

Abstract: A wide dispersion speaker system 1 comprises a cone type speaker unit 2, and a restricting element 10A. The restricting element 10A is provided with a center hole 11 at a center section thereof, and a peripheral hole 12 located outward relative to the center hole 11. The restricting element 10A has an annular sound travel inhibiting portion 19 positioned radially outward relative to the center hole 11 and radially inward relative to the peripheral hole 12. An outer end in a radial direction of the sound travel inhibiting portion 19 is positioned at a substantially middle point between an outer end in the radial direction of the center hole 11 and an outer end in the radial direction of the peripheral hole 12 or positioned radially outward relative to the substantially middle point.

Abstract: A device 1 for measuring a propagation time of a sound wave comprises a sound source means 11 and a calculation means 12. The sound source means 11 outputs a time stretched pulse as a sound source signal input to a speaker 3. The calculation means 12 calculates a cross-correlation function of the time stretched pulse and the sound signal which is output from the speaker 3 and is received in a microphone 4. Based on the cross-correlation function, the propagation time of the sound wave between the speaker 3 and the microphone 4 is found.

Abstract: A device 20 for detecting a resonant frequency comprises a sound source means 21, a signal synthesization switching means 26 and 27, and a measuring means 25. The signal synthesization switching means 26 and 27 are capable of switching between a first state in which the signal synthesization switching means 26 and 27 outputs a measurement signal and a second state in which the signal synthesization switching means 26 and 27 outputs a synthesized signal containing the measurement signal and the signal output from a microphone 14. The device 20 detects the resonant frequency based on comparison between the first amplitude frequency characteristic measured in the first state and the second amplitude frequency characteristic measured in the second state.

Abstract: The present invention provides a digital communication system which is free from noise generated in a receiver. A transmitter converts an analog input signal to a digital signal, and then a power level detector 5 compares the digital signal with a predetermined level. In accordance with the result, the transmitter transmits a transmission signal which includes the digital signal or a digital signal amplified from that digital signal, and a control bit indicative of the result of comparison. The receiver, in accordance with the control bit included in the received digital signal, outputs an analog signal converted from the received digital signal or an analog signal converted from the received digital signal after it is digitally amplified.

Abstract: Receiving antennas 2a, 2b receive a digital modulated signal from a digital wireless microphone. The digital modulated signal comprises a carrier signal modulated with successively generated digital signal trains. A changeover switch 4 selects one of the antennas 2a, 2b in response to a selection signal. A high-frequency unit 8, a demodulating unit 10 and a decoding unit 12 receive and demodulate the digital modulated signal received by the selected antenna. Analog comparators 24a, 24b compare a reception level indicative signal from the high-frequency unit 8 with threshold values, and a diversity judging unit 28 changes the selection signal in accordance with the comparison result. The digital signal trains comprise a plurality of successive frames, and each frame includes an information data section, a preamble section preceding the information data section for establishing synchronization of the information data section, and a guard bit section succeeding the information data section.

Abstract: A master clock signal source (10) generates a master clock signal having a frequency equal to N times the bit rate of received data, where N is a positive integer. A modulo-N counter (12) counts the master clock signal. An edge detecting circuit (4) detects a transition of the received data from a H level to a L level. A counter (8) counts the master clock signal and resets the modulo-N counter (12) if the count counted during a time period in which three edge representative signals occur is 2N. In accordance with the count in the modulo-N counter 12, a clock generating unit 14 generates a clock signal.

Abstract: The present invention relates to a method and apparatus for measuring the organic carbon content (TOC) in a test liquid by irradiating the test liquid, such as ultrapure water, with ultraviolet radiation and measuring the conductivity of the test liquid that changes due to the produced organic acids and carbon dioxide. After the test liquid is irradiated for a fixed time interval with ultraviolet light in an oxidization process vessel, the irradiation is stopped. The flow rate of the test liquid is such that a portion of test liquid is present that has received the complete irradiation from the commencement to the extinguishing of the lighting of the ultraviolet light source.

Abstract: An electroacoustic transducer of a horn loudspeaker emits sound, which is supplied through a sound conduit pipe to a horn and propagated out of the horn through a mouth of the horn. The sound conduit pipe is coupled to the horn via a rectangular opening in the upper one of the upper and lower walls forming the horn, to thereby provide a linear sound source for the loudspeaker. The location where the sound conduit pipe is coupled to the horn and/or the tilt angle of the sound conduit pipe with respect to the horn may be varied to control the sound radiation characteristic of the loudspeaker.