JPS6329344B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data reading device used for recording and reproducing digital signals such as programs and data in an electronic cash register on a commercially available cassette tape. The detection state is displayed on the display section of the registration machine.

Currently, when reading various data into an electronic cash register from a commercially available audio cassette deck, the connection between this electronic device and the audio cassette deck is made using the audio cassette deck's earphone terminal. The reliability of the read data is greatly influenced by the adjustment state of the output adjustment volume of the audio cassette deck. Note that this volume adjustment is performed based on the intuition of the operator, so if proper reading is not possible, the volume adjustment is currently performed again.

The present invention determines and displays whether or not the playback level is appropriate based only on the playback signal sent from the audio tape deck side, without sending a feedback signal from the electronic device on the audio tape deck side. The purpose is to provide an electronic cash register that

Audio tape decks currently on the market generally use AC-coupled amplifiers, and when the amplification degree of the amplifier exceeds a certain level, the portions a ₁ and a ₂ in Figure 4a, that is, the actual signal Before and after the waveform,
There is a characteristic in which a 1/2 cycle waveform as shown by the broken line appears, and the present invention attempts to utilize this characteristic.

Hereinafter, the present invention will be explained based on drawings of embodiments.

FIG. 1 is a diagram showing the connection between an electronic device and an audio cassette deck for implementing the present invention.
An earphone terminal 2 of an audio cassette deck 1 and an input terminal 4 of an electronic device 3 are connected by a cable 5, and the electronic device 3 has a built-in level detection device of the present invention.

FIG. 2 is a circuit diagram showing an embodiment of the present invention. The electronic device 3 includes an amplifier 7, an integrator 8 having a rectification function, a waveform shaping circuit 9 that shapes the wave into a square wave, a measurement circuit 10 that measures the time width of the square wave, and a pulse time width that is larger or smaller than a predetermined time. A determination circuit 11 that determines whether the reproduction level is excessive, a symbol that indicates that the reproduction level is excessive, a symbol that generates, for example, an "H" character signal, an "H" display signal generator 12, a symbol that indicates that the reproduction level is appropriate. For example, a symbol "M" display signal generator 13 that generates a character signal of "M", a symbol that indicates that the reproduction level is too low, a symbol "L" display signal generator 18 that generates a character signal of "L", for example. , a reproduction level detection circuit 17, AND gates 14, 15, 19, and a display 16.

Next, prior to explaining the operation of the above embodiment, the digital signals recorded on the audio cassette tape will be explained.

FIG. 3 shows a modulation waveform by a recording signal modulation device built into the electronic device 3. FIG. For example, as shown in figure a, the digital signal to be recorded on a cassette tape consists of a total of 10 bits: 1 bit for start (ST), 8 bits for data (D), and 1 bit for stop (SP).
The start bit is a synchronization signal between each character and has a digital level of H.
(high), and the stop bit is a signal indicating the end of each character and is set to digital level L (low). As shown in Figure b, such a digital signal is modulated into an AC waveform at a digital level H and is input to the recording terminal of the cassette deck 1. The time length of each bit is regulated to a predetermined value by a clock generator, and furthermore, prior to data transmission, a level calibration signal indicating a reference for the amplitude of the AC waveform and a reference for the time length of one bit are provided. A time calibration signal is sent and recorded.

Next, the operation of the embodiment shown in FIG. 1 will be explained. When the cassette deck 1 is driven for reproduction, the reproduced data is amplified to a predetermined level by the amplifier 6 on the cassette deck side, inputted to the input terminal 4 of the electronic device 3 through the cable 5, and amplified by the amplifier 7 on the electronic device side. For one bit at H level, a signal waveform as shown by the solid line in FIG. 4a is obtained. This signal is rectified and integrated in the next stage integrator 8,
The waveform becomes as shown by the solid line in Figure b of the same figure, and then,
The waveform shaping circuit 9 at the next stage shapes the signal into a square wave to obtain a signal with a waveform as shown by the solid line in FIG. Then, the measurement circuit 10 at the next stage measures the pulse time width T of the square waveform.

Here, when the reproduction level in the audio cassette deck 1 is appropriate, the pulse time width _T1 is measured by processing as shown by the solid line in FIG. 4, but when the reproduction level is too high, The waveforms in parts a ₁ and a ₂ of the figure are amplified as shown by the broken lines, and therefore the output of the integrator 8 also rises quickly and falls quickly, as shown by the broken lines in figure b. The waveform is delayed, so the rectangular waveform obtained by shaping it is as shown by the broken line in figure c.
The pulse time width becomes a larger value T ₂ than the above-mentioned T ₁ .

The determination circuit 11 determines whether the pulse time width T measured in this way is larger or smaller than a preset time, and if the measured value T is larger than the set value, the pulse time width T is output to the first output terminal _d1 . The true value "1" is outputted, and conversely, if the measured value T is smaller than the set value, the true value "1" is outputted to the second output terminal _d2 . When the determination signal is output to the first output terminal _d1 , the signal _e1 associated with the symbol "H" indicating an excessive level is sent to the display section 16 through the AND gate 14, and the signal becomes "H". is displayed and a judgment signal is output to the second output terminal _d2 , a signal _e2 related to the symbol "M" indicating the appropriate level is sent to the display section 16 through the AND gate 15. The symbol "M" is displayed. Further, the playback level detection circuit 17 detects that the playback level is lower than a predetermined value, and when it is detected that the playback level is lower than the predetermined value, it prohibits the operation of the determination circuit 11, and also detects that the playback level is too low. A signal _e3 related to the symbol "L" indicating a certain thing is sent to the display section 16 through the AND gate 19, and the symbol "L" is displayed. Therefore, the operator should check whether the display 16 shows "H,""M," or "L," and adjust the volume of the cassette deck 1 so that it becomes "M." You can get the regeneration level.

According to the present invention, the time width of the shaped pulse waveform on the electronic cash register side is measured, the suitability of the playback level on the tape deck side is determined, and the result of the determination is displayed on the display section of the cash register. from,
It can be applied regardless of the amplification characteristics of the tape deck, and the operator can easily adjust it by looking at the displayed contents. It is also very convenient.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the connection relationship between an electronic device and a tape deck according to the present invention. FIG. 2 is a block diagram showing the circuit configuration of an embodiment of the present invention. FIGS. 3 and 4 are explanatory diagrams of the operation of the present invention. 1... Tape deck, 3... Electronic equipment, 5...
Cable, 7...Amplifier, 8...Integrator, 9...
Waveform shaping circuit, 10...Pulse time width measuring means,
11... Judgment circuit, 12... Symbol "H" display signal generator, 13... Symbol "M" display signal generator, 1
8... Symbol "L" display signal generator, 16... Display device.

Claims (1)

[Claims] 1 A cash register that registers and processes various monetary transaction information, and in order to demodulate a modulated digital signal, it has an amplifier that amplifies the input signal, an integrator that rectifies and integrates this amplified signal, and an output of this integrator. and pulse time width measuring means for measuring the time width of the signal, and configured to determine the amplitude level of the input signal based on the measured value of the measuring means and display the determination result on the display section of the registration device. An electronic cash register machine that is characterized by: