摘要:
There is provided a method for calculating the call processing capacity of a mobile communication system using an Internet communication network. The present invention calculates and stores the call processing capacity of a mobile communication system using an Internet web browser and database to attain accurate call processing capacity information, thereby obtaining an optimal mobile communication system design. Furthermore, since multiple designers can share information about the calculated call processing capacity through a database, thereby making the call processing capacity information be actively effectively used.
摘要:
A digital demodulator includes: a local oscillator for generating a predetermined frequency signal; a mixer for mixing an intermediate frequency (IF) signal with a local oscillation frequency signal output by the local oscillator; an A/D converter for converting a signal output by the mixer into a digital signal; an I and Q signal generator for producing I and Q signals from an output of the A/D converter; and a compensation unit for compensating the signals I and Q for phase errors.
摘要翻译:数字解调器包括:本地振荡器,用于产生预定的频率信号; 用于将中频(IF)信号与由本地振荡器输出的本地振荡频率信号混合的混频器; A / D转换器,用于将由混频器输出的信号转换成数字信号; 用于从A / D转换器的输出产生I和Q信号的I和Q信号发生器; 以及补偿单元,用于补偿信号I和Q的相位误差。
摘要:
The present invention discloses a parity detection device and method in a CDMA mobile communications system, which detects parity error in data output from a cell site modem (Q51601-2S1), and controls the data output when the parity error occurs, to improve the reliability in data communication. The invention converts serial data to be transmitted through a CSM into parallel data, checks if there is a parity error in the parallel data, and generates an interrupt when a parity error is detected. When the interrupt is generated, an output controller restrains the transmission of the serial data to be transmitted, which is outputted from the CSM, thereby preventing data having error from being transmitted.
摘要:
An output signal measuring apparatus for a multiple frequency oscillator device and output signal measuring and correcting methods therefor which are capable of accurately and rapidly measuring a signal from each terminal of a multiple frequency oscillator device and minimizing a measuring and correcting time by automatically performing a correction required for a measurement. The apparatus is capable of measuring each terminal of a multiple frequency oscillator based on a switching circuit in accordance with control of a computer by integrating a plurality of measuring equipment into one system for satisfying a corresponding measuring item with respect to all terminals of the multiple frequency oscillator, automatically correcting with respect to each such terminal, and accurately and rapidly measuring each terminal of the multiple frequency oscillator by using a predetermined time and manpower, thus implementing mass production.
摘要:
In an error data removing apparatus and method by decoding delay in a DTV system which employs a decoder of the VSB standard, respective segments or respective fields are divided into area 1 and area 2 using a starting point of decoded data as a reference to provide the decoded data of said area 1 section without involving delay and provide the decoded data of said area 2 section by delaying as long as a sync signal. A memory is utilized as the decoded data delay apparatus, and at this time, a value of a counter used for generating an address for reading/writing of the memory is utilized to delay the segment sync signal and field sync signal as required without separately using flip-flop or memory.
摘要:
An apparatus for remedying errors in a head end monitoring block includes an optical transmitting section for transmitting/receiving aerial broadcasting signals and its own broadcasting signals; a host computer for controlling respective sections of a head end; a master control section for monitoring an operating state of a transmitting path of the head end and the codeck boards; a master mother section for receiving certain signals from the master control section so as to connect communication paths between the optical transmitting section, the host computer and the master control section; a slave control section for monitoring the transmission state of a relevant codeck board, and for receiving an error occurrence signal from the master control section so as to carry out the function of the master control section in place of it; and a slave mother section for receiving an error occurrence signal from the master control section so as to connect communication paths between the optical transmitting section, the host computer and the master control section. In operation, if an error occurs in the master control board, the slave control board takes over the function of the master control board to carry out the head end block monitoring task in place of it. A method for remedying errors in a head end monitoring block includes analogous steps.
摘要:
A loop back device of a packet communication T1 network includes: a clock generating part which inputs a frame divisional clock and a reference clock, inserts a modulated clock at a predetermined position of the reference clock to generate a main clock and is synchronous to the transformed clock position to generate a system clock for generating and extracting loop back data; a loop back data inserting part which generates the loop back data and is synchronous to the system clock generated from the clock generating part to insert the loop back data into transmission data; a framer and interface part which inputs the transmission data including the loop back data outputted from the loop back data inserting part to transmit the input data to the T1 network and receives is data from the T1 network; a loop back data extracting part which is synchronous to the system clock generated in the clock generating part to extract the loop back data from reception data outputted from the framer and interface part; and a processor which outputs the transmission data to the loop back data inserting part and inputs said loop back data extracted from said loop back data extracting part, to output network testing data.
摘要:
A circuit for converting frame data is disclosed, in which data communications can be carried out by matching the T1 repeater line of the North American method and the E1 repeater line of the CEPT. The four 32-channel frame data of the E1 line of the CEPT method are converted into parallel data of 8-bit one channel, and are stored into four 64-byte buffers. The stored 32-channel frame data are read out by 24 channels at a time, while the remaining data of the 6 channels are added to the data which have been stored in the buffers. Thus five 24-channel frame data are converted into serial data before being outputted. Of the five 24-channel frame data of the T1 repeater line of the North American method, four 24-channel frame data are stored into four 64-byte buffers, while the remaining one 24-channel frame data are separated by 6 so as to store them into the four 64-byte buffers, so that the four 64-byte buffers can store the 32-channel data respectively. The 32-channel data which have been stored in the four 64-byte buffers are sequentially read out, and then, are converted into serial data before outputting them.
摘要:
A bus interface circuit is for coupling between a microprocessor having an architecture in which address and data buses are separated and peripheral equipment having a multiplexing bus architecture. The bus interface circuit includes a first delay circuit for delaying a first address strobe signal of a microprocessor to obtain a first data strobe signal, a second delay circuit for delaying the first data strobe signal to obtain a second data strobe signal for the peripheral equipment, a logic circuit for multiplying an inverted first data strobe signal and the first address strobe signal to obtain a second address strobe signal for the peripheral equipment, a first buffer enabled by the first data strobe signal for transmitting address data of the microprocessor, and second buffer means enabled by the second address strobe signal for transmitting and receiving data information between the microprocessor and the peripheral equipment.
摘要:
A movable display assembly is incorporated in the car stereo for adjusting the screen viewing angle of the LCD. The movable display assembly comprises a semi-spherical display means and a guide shaft for guiding the display means in any direction within a semi-circular cavity which is formed in the forwardly opening of the front panel of the car stereo. The semi-spherical display means includes a convex rear wall and an LCD constituting the front face of the display means. The guide shaft extends horizontally from the rear face of the display means and is loosely fitted in an opening formed in the cavity. A frictional means is provided in order to hold the movable display means in place.