CN2123064U - Electronic balance with sonic display - Google Patents

Abstract

The utility model relates to an electronic balance with a phonetic device, which can automatically report weight and price, and comprises a phonetic system and an electronic balance. The phonetic system is composed of a phonetic database, a digital to analog converter, a low pass filter, a power amplifier and a loudspeaker. The function of the phonetic system is that the electric signals of the unit price, the weight and the price sum of goods which are transformed by a microcomputer in the electronic balance are reported automatically by clear synthetic speech to replace salesmen and to eliminate the phenomenon of frequency reporting the weight, the price, etc. The displayer of the electronic balance display the price and the weight simultaneously. So the utility model can be widely suitable for measuring units where weighing and quoting are needed.

Description

Electronic balance with sonic display

The utility model is a kind of speech electronic scale.

By literature search and market survey, existing electronic scales only has weighing, valuation and electronics Presentation Function thereof, the salesman still will report heavily repeatedly, quotation, the video screen of electronic display system is subjected to the restriction and the influence of environment for use simultaneously, if the putting position of scale is improper, or under accent light and outdoor sunshine shining directly, the fluoroscopic digital demonstration of display is just unclear, reports by mistake easily.

The purpose of this utility model is to provide a kind of speech electronic scale, when making its weighing that keeps existing electronic scales, valuation and digital Presentation Function, increase a kind of function of reporting automatically heavily, offering with synthetic speech again, also can tell statements such as " welcome is patronized ", " thanks " to client according to user's requirement again, solved the deficiency that existing electronic scales is subjected to the environment for use restriction, strengthened client's trust, alleviated that the salesman reports heavily repeatedly, quotation arduous, the relation between harmonious client and the salesman.

Formation of the present utility model has comprised electronic scales ［ 14 ］ and voice device ［ 15 ］.Wherein electronic scales by the scale pan ［ 1 ］, pressure transducer ［ 2 ］, operational amplifier ［ 3 ］, A/D converter ［ 4 ］, keyboard ［ 5 ］, microcomputer ［ 6 ］, nixie display ［ 7 ］, and housing ［ 13 ］ form, its function is exactly that the goods that client is bought carries out weighing, quotation, shows on display with numeral then.Voice device is made up of speech database ［ 8 ］, digital to analog converter ［ 9 ］, low-pass filter ［ 10 ］, audio-frequency power amplifier ［ 11 ］ and loudspeaker ［ 12 ］, its function is that the synthetic speech after the loudspeaker in the voice device ［ 12 ］ is handled microcomputer automatically, is clearly quoted weight, unit price and the valuation amount of money of goods in the weight and the demonstration of the valuation amount of money of electronic scales nixie display to goods.

Below by most preferred embodiment of the present utility model and its principle of work of description of drawings.

Accompanying drawing 1 is the functional-block diagram of speech electronic scale.

Accompanying drawing 2 is schematic circuits of speech electronic scale.

Accompanying drawing 3 is synoptic diagram of speech electronic scale.

When the scale pan ［ 1 ］ that article that client buys is placed on the speech electronic scale of on power supply as the salesman is gone up, the weight of weighing article product is by with the contacted pressure transducer of the scale pan ［ 2 ］, be converted to current signal with weight, the equivalent electrical circuit of sensor ［ 2 ］ is an electric bridge (as shown in Figure 2), and the size of current of its output is along with pressure is big or small linear.This strength of current has only hundreds of microamperes, via high precision operating amplifier ［ 3 ］ output one voltage signal, carries out the A/D conversion to analog to digital converter ［ 4 ］.Because electronic scales is higher to analog-to-digital accuracy requirement, range is the scale of 15kg, and requiring resolution is 5g, if satisfy this accuracy requirement, then needs 12 A/D converter, and such A/D converter price is expensive.Though consider electronic scales conversion accuracy is had relatively high expectations, lower to the requirement of slewing rate, therefore can select for use the V/F converter to realize analog to digital conversion.Present embodiment adopts the LM331 electric voltage/frequency converter to realize the V/F conversion, and the frequency signal after the conversion is input to the counter input end of microcomputer ［ 6 ］, and microcomputer ［ 6 ］ is selected single-chip microcomputer for use, and calculates the weight of article by software.The salesman is input in the microcomputer ［ 6 ］ by the unit price of keyboard ［ 5 ］ with goods.Keyboard ［ 5 ］ is made up of 10 numerical keys and 5 function keys, and keyboard ［ 5 ］ adopts the interface method of determinant keyboard decoding with the interface of microcomputer ［ 6 ］, and adopts regularly inquiry mode timing scan keyboard.

The data sampling signal of microcomputer ［ 6 ］ output shows the weight of goods and the amount of money of valuating by the video screen of nixie display ［ 7 ］.Display ［ 7 ］ adopts fluorescent character-display tube to show, 5 of weight, and 5 of unit prices, 6 of the amount of money amount to 16.Display driver is selected HA16617 for use, and display mode is that dynamic scan shows, and realizes seven sections decodings of BCD-by software.

All sound banks ［ 8 ］ are solidificated in a slice 2Mbit(27C020) in the eprom memory, because 27C020 needs 18 address wires, and 8751 single-chip microcomputers have only 16 address wires, divide the mode of Page addressing to read speech data so adopt, promptly the 256k storage space of 27C020 storer is divided into 4 pages, every page of 64k.Present embodiment is used as the page address maker with a slice programmable gate array GAL16V8, by the speech data sampled signal of microcomputer ［ 6 ］ output through digital to analog converter ［ 9 ］, digital to analog converter ［ 9 ］ adopts 8 D/A converters of DAC0832, signal after the conversion is sent into power amplifier ［ 11 ］ after step low-pass active filter ［ 10 ］ filtering, power amplifier ［ 11 ］ adopts LM386, quotes the weight and the valuation amount of money of goods then automatically with synthetic speech through loudspeaker ［ 12 ］.The newspaper of finishing weighing, valuation and the voice of once purchasing commodities weighs, offers and numeral shows.

The utility model can be applicable to a measurement unit that is essential weighing, quotation easily.

Claims (2)

1, a kind of speech electronic scale is characterized in that it comprises electronic scales [14] and voice device [15].

2, speech electronic scale as claimed in claim 1 is characterized in that voice device ［ 15 ］ is made up of speech database ［ 8 ］, digital to analog converter ［ 9 ］, low-pass filter ［ 10 ］, audio-frequency power amplifier ［ 11 ］ and loudspeaker ［ 12 ］.

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