Disclosed is an analogue alarm electronic timepiece having a time hand. The time hand is used as both alarm setting time hand and time display hand. The analogue alarm electronic timepiece comprises a reversible motor, an electronic circuit including a driving circuit for the reversible motor and means for counting and storing at least two kinds of relative time differences selected from the group consisting of the relative time difference between the present time and alarm time, the relative ti...

An analogue alarm electronic timepiece has electronic circuitry for controlling the drive of the time-indicating hands by a reversible stepping motor to selectively position the hands at desired alarm time and display time settings. Externally operable switches control the operation of the electronic circuitry and enable re-positioning of the hands by the motor to the previously set alarm time so that the user of the timepiece may confirm the alarm time setting. The electronic circuit includes a...

A combined analogue and digital display device having a plurality of individually energizable display elements arranged symmetrically with at least some of the elements common to both displays. Several of the elements are disposed so as to form groups of segments or zones, each group representing one digit of the digital display. Several others of the elements are disclosed radially to form an analogue display for simulating a parameter, such as time, by representing an hours hand and a minutes ...

A digital-to-analogue converter arrangement employs a digital-to-analog converter circuit (10) of a type producing an output voltage V(n') such that: ##EQU1## where k is a constant, E is a voltage applied to a reference voltage input, n' is a binary number applied to a binary signal input and M' is the maximum value n' can attain. The converter arrangement includes a negative feedback network (20) coupled between the output (13) of the digital-to-analogue converter circuit and the reference volt...

An analogue to digital converter comprises first and second switches (21:26) for sampling alternately first and second analogue signals, respectively, first and second integrators (22:27) which are supplied with the first and second analogue signals sampled alternately by the first and second switches (21:26), respectively, and produce output voltages varying in response to the first and second analogue signals supplied thereto, a constant current source section (32) operative to supply with a c...

An analogue signal coder including circuitry for digitizing the analogue signal, deriving a long term correlation coefficient for the analogue signal and for deriving a number of short term coefficients. The coder also includes circuitry for deriving an excitation sequence which can be used to synthesize an approximation to the analogue signal. The circuitry for deriving a long term coefficient derives a plurality of sums of products of samples of the digitized signal and interpolates the sums o...

A current mode pipelined analogue to digital converter (ADC) has a plurality of serially connected conversion stages. Each conversion stage has an input (40) for receiving a sampled and held current which is connected via a switch (S41) to a first current memory (M42) and via a switch (S40) to a second current memory (M41). The output of the second current memory (M41) is fed via a switch (S44) to one input of a summing junction (46). The output of the first current memory (M42) is fed via a swi...

Current telecommunications device transmission stages require a significant number of analogue (DAC) components. The present invention provides a digital to analogue converter implementation for coupling to the digital signal processing (DSP) stage of the device and comprises a DAC and means to nullify the output of the DAC over part of the DSP data output period to produce a series of pulses corresponding to this data. The pulses are bandpass filtered to produce an analogue output signal at an ...

A signal convertor comprising a pulse modulator, and means for modifying the signal input thereto in dependence upon the error in previous values of the output thereof, to reduce the effects of said error within a desired signal band.

A chronograph watch comprises a first motor controlled by a quartz resonator coupled to a first simple integrated circuit. This motor drives, through gearing, the time indicating members of the watch. A second motor controlled by a second quartz resonator coupled to a second simple integrated circuit, identical to said first integrated circuit, can be operated at a higher frequency when a switch, which is operable manually by means of a pushbutton and interposed between electrical ground and a t...