Abstract: A speech synthesizer, using linear predictive coding technique, obtains variable frame lengths by multiplying a pitch period by the number of repetitions, and interpolates PARCOR coefficients at a rate different than the interpolation of amplitude.

Abstract: A digital electronic timepiece having a multi-digit digital display for displaying the time count in a time counter which receives a divided down time signal from a time base signal generator. At least one settable time counter for storing a count corresponding to a desired time period is provided which is receptive of a time signal for decrementing the count thereof to zero. A plurality of display driving signals, each corresponding to one digit of display are generated wherein the display signals of successive digits are phase delayed with respect to each other and the frequency thereof is sufficiently low to produce visible flickering of display. Upon the sensing of the zero count in the timer counter, the display which is normally non-flickering, is driven with the display driving signals to produce a sequential flickering of the digits of the time display to provide a visual indication of the lapse of the desired time period.

Abstract: An alarm electronic timepiece comprises a time circuit including a time standard signal oscillator for generating a time signal fed to a time display portion for displaying time. An alarm device is driven by an alarm driving circuit to produce an audible alarm sound. An alarm signal compound circuit develops a plurality of signals having different duty cycles and having a frequency in the audible frequency range, and serially arranges the plurality of signals in a predetermined pattern to form an alarm signal composed of the serially arranged signals of different duty cycles which is applied to the alarm driving circuit to produce an audible alarm sound having a predetermined sound pressure variation pattern.

Abstract: A digital alarm timepiece comprising an oscillator circuit for generating a standard time signal, a frequency dividing circuit, time counting circuits for counting output signals of the dividing circuit to provide a time signal, alarm time memory counting circuits for setting a selected alarm time, display means for selectively displaying the time signal and the set alarm time, alarm sound generating means and a coincidence circuit for activating the alarm sound generating means upon occurrence of coincidence between the set time of the alarm and the time signal has circuit means including manually operable switch means for amending the count of the time counting ciruits, to correct the time signal and for amending the count of the alarm time memory counting circuits to set a selected alarm time and means for activating the alarm sound generating means whenever the switch means is operated to amend the count of one or another of the counting means.

Abstract: A digital electronic alarm timepiece comprising an oscillator circuit for generating a signal, frequency dividing means, time counting circuit means, alarm time memory counting means, alarm sound signal generating means and a coincidence circuit for activating the alarm sound signal generating means when coincidence occurs between the time of the alarm time memory counting means and the time of the time counting circuit means, has manually operable switching means for activating the alarm sound signal generating means independently of the coincidence circuit. The switching means comprises four individual switches which can be selectively actuated in different combinations to amend the count of the time counting circuit means, to set the time of the alarm time memory counting means and to activate the alarm sound signal generating means.

Abstract: The invention provides a digital alarm watch comprising at least a time keeping circuit, an illuminating means and an alarm means, wherein the illuminating is adapted to be prevented from operating when the alarm means operates.