Quotables
"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
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| Number | Title | Issue Date |
| 5920853 | Signal compression using index mapping technique for the sharing of quantization tables A signal compression system includes a coder and a decoder. The coder includes an extract unit for extracting an input feature vector from an input signal, a coder memory unit for storing a predesigned vector quantization (VQ) table for the coder such tha... | 07/06/1999 |
| 5896576 | Audio mute for digital cordless telephone A signal indicating the quality of the received digital data in an ADPCM cordless telephone system is monitored and a transition from good to poor quality is detected. In response to this detection, a first attenuation level is applied to the received sig... | 04/20/1999 |
| 5892792 | 12-chip coded spread spectrum modulation for direct conversion radio architecture in a digital cordless telephone A cordless direct sequence spread spectrum telephone using a direct conversion radio architecture wherein the code sequence used for spreading and despreading is an even code sequence to prevent addition of low frequency noise in the down-conversion proce... | 04/06/1999 |
| 5880980 | Distributed decimation sample rate conversion A system for decimating a source signal with a source sample rate by a non-integer factor to a sink signal with a sink sample rate is disclosed. The system first determines a decimation factor based on a ratio of the source sample rate to the sink sample ... | 03/09/1999 |
| 5867560 | Remote hang-up detector A communications detector for detecting remote user hang-up or disconnection by a telephone answering machine (TAM). The remote hang-up detector (RHUD) may operate in conjunction with a modem and does not affect transmission and receipt of modem signals a... | 02/02/1999 |
| 5845204 | Method and apparatus for controlling the wakeup logic of a radio receiver in sleep mode A low-power stop mode "snooze" timer is implemented in the processing unit of a communication system, which runs without the use of the usual crystal-controlled oscillator. The "snooze" timer is implemented by a second oscillator with associated timer cir... | 12/01/1998 |
| 5835430 | Method of providing redundancy in electrically alterable memories A method of providing redundancy in an electrically alterable memory divided into addressable blocks within the memory. The electrically alterable memory should have more available blocks than required by the firmware. The method includes the steps of tes... | 11/10/1998 |
| 5834953 | High speed current sense amplifier A high speed current sense amplifier useful in memory devices, which includes a current-to-voltage amplifier that is coupled to a voltage amplifier. The current-to-voltage amplifier has an input impedance that is lower than its output impedance. The volta... | 11/10/1998 |
| 5828708 | CID demodulator for DCT A system for demodulating a FSK digital signal comprising: first and second frequency detectors connected to detect the frequency of the digital signal, the first frequency detector producing an output signal whenever the digital signal is detected to hav... | 10/27/1998 |
| 5828692 | Baseband demodulator for polar or rectangular modulated signal in a cordless spread spectrum telephone A cordless telephone system connectable to the public switched telephone network having a base station and one or more handsets communicating with the base station by an RF link utilizing a DBPSK I and Q demodulator with a digital AGC loop. When R .angle.... | 10/27/1998 |
| 5799034 | Frequency acquisition method for direct sequence spread spectrum systems A frequency acquisition and compensation device and method for direct sequence spread spectrum communications systems has an identification (ID) sequence in an acquisition frame which is received by a receiving station and an ID sequence stored in an ID r... | 08/25/1998 |
| 5790656 | Data access arrangement with telephone interface A data access arrangement (DAA) interface for alternately coupling a telephone set to a modem for operation in conjunction with and independent of the central office power supply line. The DAA interface provides an enhanced power supply to supply adequate... | 08/04/1998 |
| 5790561 | Internal testability system for microprocessor-based integrated circuit A fault isolation system for use in an integrated circuit. The fault isolation system includes multiple input shift registers which are connected end-to-end, serial output to serial input, for convenient interface with a test data input and test data outp... | 08/04/1998 |
| 5781880 | Pitch lag estimation using frequency-domain lowpass filtering of the linear predictive coding (LPC) residual A pitch estimation device and method utilizing a multi-resolution approach to estimate a pitch lag value of input speech. The system includes determining the LPC residual of the speech and sampling the LPC residual. A discrete Fourier transform is applied... | 07/14/1998 |
| 5781128 | Data compression system and method A method and system for encoding an input signal for storage or transmission over a communications channel by transforming successive vectors of parameters of the input signal into a corresponding succession of index signals, each index signal being assoc... | 07/14/1998 |
| 5778241 | Space vector data path A space vector data path for integrating SIMD scheme into a general-purpose programmable processor. The programmable processor uses a mode field in each instruction to specify, for each instruction, whether an operand is processed in either one of vector ... | 07/07/1998 |
| 5778022 | Extended time tracking and peak energy in-window demodulation for use in a direct sequence spread spectrum system A direct sequence spread spectrum communication system in a digital cordless telephone having a basestation and a handset that each implement an extended .linevert split.EE.linevert split.+.linevert split.E.linevert split.-.linevert split.L.linevert split... | 07/07/1998 |
| 5774849 | Method and apparatus for generating frame voicing decisions of an incoming speech signal A method is disclosed for generating frame voicing decisions for an incoming speech signal having periods of active voice and non-active voice for a speech encoder in a speech communication system. The method first extracts a predetermined set of paramete... | 06/30/1998 |
| 5774839 | Delayed decision switched prediction multi-stage LSF vector quantization An apparatus and method of quantizing a sequence of input data vectors using delayed decision switched prediction and vector quantization. The method has the following steps of operation: (a) predicting a next vector element from said sequence of input da... | 06/30/1998 |
| 5768309 | Unified trellis encoder A method of digital data transmission between a first transceiver and a second transceiver is disclosed. The first transceiver has a first transmitter and a first receiver and the second transceiver has a second transmitter and a second receiver. The firs... | 06/16/1998 |
| 5764694 | Self-testing and evaluation system A testing and evaluation system for efficiently qualifying individual components of a modem. A modem data pump acts as a dBm meter by measuring distortion, noise floor, and echo. The modem is coupled to a computer and a remote modem. After calibration, th... | 06/09/1998 |
| 5764689 | Variable digital automatic gain control in a cordless direct sequence spread spectrum telephone A cordless telephone system connectable to the public switched telephone network having a base station and one or more handsets communicating with the base station by an RF link utility time division duplex direct sequence spread spectrum modulation techn... | 06/09/1998 |
| 5761250 | Iterative filtering frequency estimator and estimation method A method and apparatus for iterative carrier frequency estimation of a base station by a mobile station in a wireless communication system is disclosed. Upon detecting a frequency correction burst ("FCB") signal from the wireless transmission of the base ... | 06/02/1998 |
| 5758263 | Selection of communication channel in a digital cordless telephone A method for testing a communication link between first and second components of a system, which components communicate via a selected one of a plurality of broadcast channels, the second component being powered by a self-contained power source, the metho... | 05/26/1998 |
| 5754601 | Jitter circuit for reduced switching noise A circuit for reducing switching noise caused by harmonics of an output coupled to a band of interest in a mixed signal communication device, with the mixed signal communication device having a predetermined sampling clock. The circuit comprises a bandpas... | 05/19/1998 |
| 5742679 | Optimized simultaneous audio and data transmission using QADM with phase randomization An subsystem processor for converting an input audio signal to complex audio samples for QADM processing by a modem for communication with a remote modem is disclosed. The audio process comprises a decorrelator for processing the input audio to generate a... | 04/21/1998 |
| 5736887 | Five volt tolerant protection circuit A low voltage driver tolerant of high voltage and suitable for driving a processor and a memory device. A first protection NFET is coupled to the drains of a series-coupled PFET and NFET forming the basic driver components. Another protection NFET is conn... | 04/07/1998 |
| 5732111 | Frequency error compensation for direct sequence spread spectrum systems A frequency error calibration, estimation and compensation device and method for direct sequence spread spectrum systems, such as digital cordless telephones having a handset and a base station. Initial frequency calibration occurs when the handset is phy... | 03/24/1998 |
| 5724657 | Adaptive frequency correction burst detector for GSM handset system An adaptive frequency correction burst detector for GSM handset systems in a wireless communication system is disclosed. The detector uses a bandpass filter to filter the complex received samples to generate a first filtered output r(n). The first filtere... | 03/03/1998 |
| 5706369 | Base-n resolution converter A resolution conversion system for real-time expansion and reduction of a first plurality of input pixels into a second plurality of output pixels. The resolution conversion system comprises a base-n counter for counting input pixels as each pixel is capt... | 01/06/1998 |
| 5699481 | Timing recovery scheme for packet speech in multiplexing environment of voice with data applications Multiple speech bit-stream frame buffers are used between the controller and the speech decoder. Whenever excessive or missing speech packages are detected, the speech decoder switches to a special corrective mode. If there is too much, the buffered frame... | 12/16/1997 |
| 5694521 | Variable speed playback system A variable speed playback system exploits multiple-period similarities within a residual signal, and includes multiple-period template matching which may be applied to alter the excitation periodical structure, and thereby increase or decrease the rate of... | 12/02/1997 |
| 5689615 | Usage of voice activity detection for efficient coding of speech A method for efficient coding of non-active voice periods is disclosed for a speech communication system with (a) a speech encoder, (b) a communication channel and (c) a speech decoder. The method intermittently sends some information about the background... | 11/18/1997 |
| 5686847 | Reduced sensitivity power-on reset circuitry A circuit for resetting an electronic system based on voltage fluctuations in the power supply is disclosed. The circuit comprises a diode means for generating a first voltage being offset from the supply voltage, a first inverter having its input connect... | 11/11/1997 |
| 5664054 | Spike code-excited linear prediction A conventional CELP speech codec synthesizes a pitch interval in a sound by synthesizing a scaled innovation signal--typically, a random signal--and adding it to a scaled pitch signal derived from the synthesized speech of the previous pitch interval. Thi... | 09/02/1997 |
| 5655132 | Register file with multi-tasking support A register file connected to a data memory and an arithmetic logic unit for temporary storage of operands, and a method of managing such register file permits the register file to be used to maximum efficiency, and permits rapid task and context switching... | 08/05/1997 |
| 5654862 | Method and apparatus for coupling multiple independent on-chip Vdd busses to an ESD core clamp A single clamp circuit for integrated circuits with multiple Vdd power pins by coupling the various Vdd busses to an ESD clamped Vdd bus or pseudo- Vdd bus via diodes. The diodes will provide coupling from any V... | 08/05/1997 |
| 5646990 | Efficient speakerphone anti-howling system A cost-effective anti-howling system and method enables fast detection of the presence of true double talk, and substantially eliminates undesirable howling attributable to sudden changes in the acoustic echo path between a speakerphone microphone and lou... | 07/08/1997 |
| 5638077 | Differential GPS for fleet base stations with vector processing mechanization A fleet management system for a base station to obtain differential GPS corrections to the location information for the fleet vehicles. A fleet vehicle first sends the information of "position solution" back to the base station with time annotation, where... | 06/10/1997 |
