JPS58182581A - Electronic timepiece with sound storing function - Google Patents

Abstract

PURPOSE:To reduce current consumption, by holding an amplifier inactive when no sound is outputted. CONSTITUTION:A linear amplifier 5 receives a control signal from a control circuit 3 to enter an inactive state, and consequently a bias current is cut off to reduce the current consumption. When a sound signal encoded and stored at a sound recording part 8 is reproduced, the linear amplifier 5 is activated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic timepiece with a voice storage function that has a function of encoding and recording and playing back externally inputted voice, and particularly relates to a linear amplifier circuit of an input/output system thereof.

The object of the present invention is to provide a linear circuit for an electronic watch with a voice memory function that is simple and easy to integrate, and that can also reduce current consumption.
is to get an amplifier.

Note that the term "sound" in this specification is used to include all sounds such as human speech, music, and simulated sounds.

In recent years, electronic watches have become more multi-functional, and some have, for example, alarm and timer functions. However, the time notification and warning means for these functions are simply sounds determined by the manufacturer, and the user must use the given sound 111 whether he likes it or not, and what is more, the sound 111 is always used. There was the inconvenience of having to recognize and remember what it meant.

In order to eliminate this inconvenience, an electronic watch with a voice memory function is an electronic watch that has a voice memory function that allows the user to input necessary information freely from the outside by voice and output it as voice at an appropriate time. Therefore, this watch requires an input linear amplifier to amplify the input audio signal and an output linear amplifier to output the stored audio.

Normally, the operating bias point of a linear amplifier is set near the center of the power supply voltage, so a bias current constantly flows even when the amplifier is unattended, consuming a large amount of current ineffectively. To eliminate this problem, there is a method that uses an electronic switch to disconnect the power supply to the Kti and linear amplifier system. However, in the mechanical type, the electronic switch must have a current capacity sufficient to pass the entire current consumed by the linear amplifier, and such a switch is large in size and has a large control system. It turns out to be a difficult one. In recent years, electronic watches have become significantly smaller, and the batteries used as a power source are becoming smaller and have a smaller current capacity, and the shape of the parts used is also very limited, so the unmanned power mentioned above is The bias current becomes a big problem.

The present invention provides a mechanism for cutting off the bias current without disconnecting the power supply.

FIG. 1 is a plotter diagram showing an example of the configuration of an electronic circuit of an electronic timepiece with a voice storage function according to the present invention.

In Fig. 1, oscillator circuit generates a 1-digit reference clock signal, 2 is a frequency divider circuit that receives the differential thermal clock signal and generates necessary signals, r-h is a clock circuit, display circuit, etc. These are various functional circuits.

3 is a control circuit which receives input from the switches 81 to 8% and generates control signals necessary to control each function. It has 4 microphones and speakers, and 5
is connected to the linear self-amplifier according to the present invention. The linear amplifier 5 receives the control signal 8TP% from the control circuit 3.
In response to this, it enters a non-operating state and cuts off the bias voltage R to reduce current consumption. 6 is a circuit 10 (input/output) switching circuit. 7 is an encoding circuit, which is a circuit that encodes the audio signal (to(cg j*)) given as an analog quantity into a digital quantity.The signals encoded here are sequentially stored in the recording section 8. The recording section 8 is mainly composed of semiconductor memories such as random access memory (RAM) and shift registers (BR), and is based on the signal obtained from the frequency dividing circuit 2. The 9#i voice signal synthesis circuit is a circuit that synthesizes an analog voice signal (voice out) from the read digital data.

FIG. 2 is a specific example of the low current consumption output linear amplifier according to the present invention shown in FIG.

Figure 2
2 is the driver of the bipolar fist transistor C (hereinafter referred to as Tf) in the next stage;
Channel MO8, 11FKT (hereinafter referred to as N-Cl@MO
B@'P'M, abbreviated as T), 4 is a feedback resistor, and 5 is an analog electronic switch, forming a closed loop for feedback. , furthermore, 6.7 is an electronic switch for pull-up, and Q, 8Fi is a speaker driven by this negative feedback linear amplifier.

Maku, Japan TPn @ voice out n, 1st
According to the diagram.

Now, when this amplifier is activated, the signal 87P% is at logic level "0", and the electronic switch 5 is set to 0, 6.7
FiOFl, and the circuit forms a negative feedback linear amplifier. At this time, self-bias is applied due to negative feedback,
The bias point is electric g1. It is approximately the midpoint of (VDD - Vaa). Therefore, 1 inverter and 2 and 3 Tr.
As a result, the bias current (sheet current R) is consumed. Therefore, when the eaost signal is not input, the amplifier is inactive to cut this bias current and reduce current consumption. At this time, BTP%Fi logic v hell r I JKt, Tesui y
f5 fOF Turn ON F', 6, and 7. From this K, the negative feedback path is cut, the input of inverter 1 is set to VDD, and the output is set to V#1.9th, Tf of 2 is set to 0FFL, and the pace of 30Tr is set to VDD by 7, and Tf3 becomes ○yy BTP as 0 or more, "1" K
What to do Kyo p1 Inverter 1 operates digitally and T
Since r2 and r3 are turned off, the bias current is cut.

FIG. 3 is another specific example of the low current consumption output linear amplifier according to the present invention shown in FIG.

In FIG. 3, each circuit component is similar to FIG. 2 except that the electronic switch 7 is for pull-down.

As in Fig. 2, when this amplifier is set to inactive state 11, 8
Set TP% to "1" and turn off electronic switch 5; 6.
Turn on 7. Tr2.3 is turned off by an electronic switch 6.7, the gate or base is connected to the power supply, and Tr3 is turned off by an inverter l.
The input of is connected via the voice coil of the speaker 8 and the feedback resistor 4. Is that all? ), 5TPnf
By setting :r I JK, the inverter performs digital operation and ter2.3 is turned off, so the bias current is cut.

As described above, according to the present invention, when no audio is output, the amplifier is deactivated with one control signal, thereby reducing current consumption, as seen in the zero-wire configuration example. to 1
Since most of the amplifier configuration can be integrated into an IC and the current consumption is small, the present invention can be an effective means for small-sized portable devices such as wristwatches.

[Brief explanation of drawings]

Fig. 1 2 Example of electronic circuit configuration of an electronic watch with voice memory function according to the present invention 1s 2 Fig. 2 Example of an output linear amplifier according to the present invention Fig. 3 Another specific example of an output linear amplifier according to the present invention People Suwa Seikosha Co., Ltd.

Claims (1)

[Claims] In an electronic watch with a voice storage function, which has a bell sound device that encodes and records and stores the voice input from the outside, and an output device that reads out the content stored in the recording device, converts it into a voice signal, and outputs the voice. , the recording device or the output device has a negative feedback linear ψ amplifier, and the contract feedback linear amplifier has at least one C-
Equipped with an inverter consisting of MOB @ 72 pins and an analog electronic switch to open the closed loop, and an electronic switch to pre-up or pull down each signal line making up the closed loop to the power supply as necessary. An electronic watch with a voice memory function, characterized by: