Abstract: A speech recognition method that combines HMMs and vector quantization to model the speech signal and adds spectral derivative information in the speech parameters. Each state of a HMM is modeled by two different VQ-codebooks. One is trained by using the spectral parameters and the second is trained by using the spectral derivative parameters.

Abstract: A method and apparatus for implementing telephone network services in networks provided with co-channel signaling. The signaling is routed over an intelligent node point and signaling information is converted at the node point for carrying out the services. Signaling information is processed separately from network switching equipment and voice transmissions relating to signaling information are not routed over the node point.

Abstract: The invention relates to a method for the transfer of data transmitted from a base station (PBS) to a central station (PAC) in a personal paging network, comprising base stations (PBS) for transmitting paging messages over a radio and a central station (PAC) for controlling operation of the base stations on the basis of data received from the base stations. The radio channel used for the transmission of paging messages is also used for the transfer of said data to be transmitted from the base stations (PBS) to the central station (PAC).

Abstract: A method for relocating a subscriber in a voice messaging system (VMS) which is connected with an extensive digital mobile network (GMS), including a plurality of mobile switching centres (MSC) and a home location register (HLR). In the method, VMS checks HLR repeatedly for the location of a subscriber and concludes on the basis of this information whether the subscriber has moved into the area of some other MSC for a period of time longer than a predetermined period of time and, in a positive case, the old VMS transfers the subscriber-related information to the new VMS, thus accomplishing the automatic relocation of the subscriber's home station in connection with a new MSC.

Abstract: A method for compensating a clock's operating error, the method comprising the steps of: producing a clock frequency (f2) from a frequency (f1) of a high-frequency oscillator by dividing it with a constant (K) and; at predetermined times synchronizing the clock to an external reference frequency, characterized in that during the course of clock synchronization, there is measured a clock operating deviation, which is created during a period defined to be a synchronizing interval, by comparing the phase of the clock to that of the reference frequency and, during the synchronizing interval, i.e., the interval between synchronization steps, the oscillator frequency (f1) is adjusted by means of a controlled variable, such as voltage, based on the measurement of an oscillator operating error, in a manner that the effect of the oscillator operating error on the clock frequency is minimized.

Abstract: A method for radiosynchronization of base stations in a simulcasting network which includes a plurality of base stations to be synchronized, comprising the following steps: a.) a first set of base stations transmitting respective synchronization signals; b.) a second set of base stations receiving at least one of the respective synchronization signals for the purpose of determining several estimates of synchronization error, where each of the several estimates is an estimate of synchronization error between one of the first set of transmitting base stations and one of the second set of receiving base stations; and, c.

Abstract: Method and apparatus for synchronizing radio transmitters in a paging network. A synchronization order of base stations is determined based in part upon the relative geographic locations of the stations, and is communicated to the base stations via a command signal transmitted by the paging network unit. A predetermined first base station transmits a synchronization signal to base stations to be synchronized. Subsequent sequences of synchronization signals may be transmitted from synchronized base stations until all base stations have been synchronized. The synchronization signals may be transmitted via radio waves, and the synchronization order is determined so as to minimize the number of synchronization sequences and maximize the number of base stations synchronized simultaneously in parallel. Transmitted synchronization signals are corrected to compensate for propagation delays caused by the distance between base stations and for delays which occur within an individual transceiver.