JPS6122272B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply control system for audio output equipment.

BACKGROUND ART Conventionally, for example, audio clocks that convey necessary time information by voice instead of looking at electronic clocks, electronic desktop calculators that convey calculation information to an operator by voice, and the like have been developed.

For such audio equipment, attempts have been made to reduce the power consumption associated with audio notification as much as possible, and it is particularly necessary to reduce power consumption when powered by batteries.

Furthermore, it is extremely preferable that such a device can be used with battery power when used as a portable device, and with an AC power source when used at home.

This proposal has been made in view of the conventional points mentioned above, and in particular aims to provide a power supply control system for audio output equipment that effectively solves the conventional problems.

More specifically, the present invention provides a voice clock or the like that selectively uses battery-driven or AC-driven voice notification means (e.g., voice synthesizer, power amplifier,
Consists of speakers etc. ), the control signal that is output only during voice notification is used as a switching signal for battery power supply when battery-powered, to reduce power consumption in the power supply as much as possible, while when AC-driven, the above control signal is used as a switching signal for battery power supply. Instead of using it to control the power supply (rather, there is no need to consider power consumption), it can be used to control the power supply of externally connected equipment (such as telecoms, TVs, and other devices). be.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view of an audio clock according to an embodiment of the present invention. In the figure, 1 is a clock main body, and the main body has a display section 2 for displaying time information, time setting, time notification, and other various keys. A key operation unit 3, a speaker 4 for transmitting time information by voice, and a jack 6 for inserting an AC plug 7 during AC drive.
The outlet 5 and the AC plug 7 are equipped with a power cord 8. Reference numeral 10 denotes an outlet for connecting an external connection device (not shown) during AC drive.

FIG. 2 is a system block diagram of the same audio clock, and the same parts are denoted by the same reference numerals.

In the figure, 11 is an interface having a signal path and its control circuit for transmitting and receiving signals between the CPU 12 and the display unit 2 and key unit 3, and 12 is a clock display etc. whose oscillation source is a crystal oscillator 13 (XTAL). An arithmetic processing unit CPU (14) is provided for audibly announcing time information using an audio output unit consisting of a voice synthesizer 15, a power amplifier 16, and a speaker 17. The audio synthesizer 15 includes, for example, a ROM that digitally stores audio data, an address counter for selecting the address of the ROM, an address decoder, a D/A converter that converts ROM output digital information into analog information, a low-pass filter, etc. Can be configured. 18 is a battery, and 19 is controlled by a control signal W which is output from the CPU 12 (to be described later) only during voice notification (this signal is output by setting a 1-bit buffer in the CPU, and can be controlled not to be output by resetting it). The power supply control circuit supplies battery power 18 to the audio output unit 14 via the diodes 20 and 19 and the leaf switch 21 based on the generation of the signal W. 22 is the leaf switch 2 when the AC plug 7 is inserted into the socket 5.
Contact 1 is disconnected, and the circuit that detects AC power generates a signal Z that detects that AC power is turned on, and the signal Z is sent to the CPU via interface 11.
Added to 12. AC power is supplied to the audio output unit 14 via a circuit 22 and a diode 23. The power supply voltage _VPS in the power supply detection circuit 22 is designed to be higher than the battery power supply _VBT .

Now, when a voice notification command is output from the CPU 12, a command V is added to the voice unit 14 and operates to address information such as a predetermined set time to the ROM, while a control signal W is sent to the power supply detection circuit. Thyristor 24 instead of adding to 22
is applied to the gate of , and turns on the thyristor 24. When the thyristor 24 is turned on, current flows to the relay 25 via the power detection circuit 22, and by closing the switch 26, AC power is supplied to an externally connected device (not shown) connected to the outlet 10. For example, if the control signal W is output at a certain set time, the externally connected equipment can be turned on or off at the set time, so this can be called a time switch function. Dew. For example, by externally connecting a telephone, it is possible to record a radio broadcast from a certain time, or use it as an alarm clock, or to automatically control electrical appliances, rice cookers, cookers, etc.

FIG. 3 is a flowchart for explaining the operation of the audio clock.

According to the embodiment, the audio clock can give an audio notification in two ways: when the audio notification key (K ₁ in FIG. 1) is pressed and when the audio notification is made, and when the audio notification is made when the current time reaches the alarm time. Broadly classified.

First, in step _A0 , the time of the time pulse,
Performs clock processing such as display.

(a) When the time notification key K ₁ is pressed In step J ₁ , the presence or absence of the press of the K ₁ key is detected,
If the key is pressed, proceed to _{step J 4 ;}
The CPU 12 detects whether or not the AC power is turned on (the detection signal Z output from the power supply detection circuit 22 in FIG. (This is done by setting flag Z (Z=1). Therefore, Z=1 is shown in _J4 .) If it is determined that the AC power is turned on (Z=1), then in step _A8 AC power is supplied to the audio output unit 14 via the power supply detection circuit 22, and time information is audibly announced by an audio annunciation command from the CPU 12 (see FIG. 2). Then, at _A9 , the flag W in the CPU 12, which is set only when audio is output, is reset. Here, the flags Z, W and flag set signals are indicated by the same reference numerals. On the other hand, when Z≠1, that is, in the case of battery drive, proceed from _J4 to _A7 , set flag W, turn on the power supply control circuit 19 with the set output of flag W, and connect the battery power source 18 to the diode 20, leaf Power is supplied to the audio output unit 14 via the switch 21. After that, time notification _A8 and flag W reset _A9 are carried out in the same manner as described above.

(b) When the time key _K1 is not pressed, proceed from step _J1 to _J2 to determine whether the alarm time has been reached. If the alarm time has not yet arrived, J ₂ →A ₀ →J ₁ → until the alarm time arrives.
Repeat J ₂ , and when the alarm time arrives, proceed to J ₃ . J ₃
Then, determine whether it is AC power drive or not, and select AC drive (Z=
1), set the flag W (A ₄ ), and turn on the thyristor 24 with the set output of this flag W.
Then, the required turn-on time of the thyristor 24 is delayed (A ₅ ), and the flag W ₆ is reset at A ₆ . Note that when the thyristor 24 is turned on, the relay 26 operates and supplies AC power to the outlet 10.

On the other hand, if Z≠1, that is, battery powered, the flag W is set (A ₁ ), and the set output turns on the power supply control circuit 19 in the same way as described above, and an alarm is notified via the audio output unit (A ₂ ). , the flag W is reset (A ₃ ).

Conventionally, when obtaining the power control function and the so-called time switch function as mentioned above, both functions were provided independently, which required an additional LSI output terminal, resulting in high costs. Ta.

As explained above, according to the present invention, it is possible to share a dual-purpose power source for battery drive and AC drive, to reduce the power consumption when battery drive is as much as possible, and to control the power supply to externally connected devices when AC drive is performed. There are advantages such as

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an audio clock according to an embodiment of the present invention, FIG. 2 is a system block diagram of the audio clock, and FIG. 3 is a flowchart for explaining the operation of the same block diagram. In the figure, 1...Main body, 2...Display section, 3...Key operation section, 4...Speaker, 10...Outlet,
11...Interface, 12...CPU, 1
4...Audio output unit, 18...Battery power supply, 1
9...Power supply control circuit, 22...AC
Power supply detection circuit, 24...thyristor.

Claims (1)

[Claims] 1. In a device equipped with an audio notification means that is selectively operated by battery drive or AC drive, means for generating a control signal that is output only during audio notification is provided, and when the battery drive is performed, the control signal is outputted only when the audio notification is performed. means for supplying battery power to the voice notification means based on a signal; and during AC drive, constantly supplying AC power to the voice notification means and controlling supply of AC power to externally connected devices based on the control signal; 1. A power supply control method for an audio output device, comprising: means for controlling the power supply of an audio output device.