Abstract: In a normal state, a time counting process and a key input process are performed in accordance with an oscillation signal of 38.4 KHz generated by a crystal oscillator. In a data communication mode, a process for exchanging data with an external appliance is performed in accordance with a frequency-divided signal of the above oscillation signal and received data are stored in a memory simultaneously in a high speed process under control of an oscillation signal of 800 KHz generated by a CR oscillator. A power source circuit provides a high power source voltage, preventing all circuits from a defective operation while the high speed process is performed since the high speed process can decrease a power source voltage.

Abstract: A compact electronic apparatus employs a dynamic type memory, e.g., a dynamic random access memory (DRAM), a crystal oscillator circuit for generating a high frequency signal, and a resistor/capacitor (RC) circuit for generating a low frequency signal. When the apparatus is operated, the high frequency signal is used for accessing the data stored in the DRAM. When operation of the apparatus is interrupted, the DRAM is refreshed by the low frequency signal thus reducing the entire power consumption of the apparatus, since the power consumption of the RC oscillator circuit is lower than that of the crystal oscillator circuit.

Abstract: A wristwatch equipped with a dialing tone generator employs a low-frequency oscillator as a reference signal oscillator. The reference signal is frequency-divided into first and second frequency-divided signals, the first frequency-divided signal being used to produce a low-frequency tone signal, the second frequency-divided signal being used to produce a high-frequency tone signal. Both these tone signals are rectangular waveforms which are filtered in corresponding low-pass filters, to output first and second sine-wave signals, which are then synthesized with each other to produce a desired dialing tone.

Abstract: A dialing tone generator employs a low-frequency oscillator as a reference signal oscillator. The reference signal is frequency-divided into first and second frequency-divided signals. The first frequency-divided signal is used to produce a low-frequency tone signal, whereas the second frequency-divided signal is used to produce a high-frequency tone signal. These tone signals are rectangular waveforms. The rectangular waveforms are filtered in corresponding low-pass filters to output first and second sine-wave signals. Then, these sine-wave signals are synthesized with each other to produce a desired dialing tone.

Abstract: In a recording/reproducing apparatus, voice message information is encoded into voice message data by an encoder, and keyed in data information is converted into synthesizing speech data by a speech synthesizing circuit. Both the voice message data and the synthesized speech data are separately stored in a semiconductor memory. The speech data is independently read out from the semiconductor memory.

Abstract: Voice sounds can be recorded by recording sections in an electronic device having a timepiece function. The voice sounds indicate the purposes corresponding to alarm times so that the recorded contents may be reproduced upon operation of a particular switch.

Abstract: An electronic timepiece, which comprises a circuit for encoding an externally supplied voice and a semiconductor memory for memorizing the encoded voice data. The voice data memorized in the semiconductor memory is read out when a preset time is reached, and the data thus read out is converted into a voice signal which is coupled to a sound producing device such as a loudspeaker for the reproduction of the voice.

Abstract: A movable tape-guide control system for a helical scan type magnetic recording and reproduction apparatus, which control system is capable of detecting the time when an end portion of the magnetic tape will pass over a rotary head drum during the rewinding of the magnetic tape, and moving a guide post for guiding the magnetic tape from the rotary head drum before the end portion of the magnetic tape passes between the guide post and the rotary head drum, whereby jamming of the magnetic tape between the guide post and the rotary head drum is prevented and accordingly damage to the video head by the jammed magnetic tape or the end portion thereof is prevented. The advanced detection of the end portion of the magnetic tape is performed by monitoring when the running speed of the magnetic tape increases in comparison with the rotation speed of the magnetic tape reel by a predetermined ratio.

Abstract: An electronic timepiece has a plurality of alarm time memory circuits in a semiconductor memory means for memorizing different alarm times and a memory for memorizing voice data of messages telling for example what has to be done at alarm times memorized in the respective alarm time circuits.The voice data memorized in the memory are obtained through conversion of externally coupled voice signals, and at the arrival of an alarm time the corresponding voice data is read out and coupled to a loudspeaker for reproducing the recorded message voice.