JPS58161560A - Recorder of handwritten data - Google Patents

Abstract

PURPOSE:To reproduce a handwritten data with no error, by providing a circuit to shape the deformation of a waveform which is due to the wow and flutter of a recording/reproducing device. CONSTITUTION:A signal (a) supplied from a demodulator 43 is equal to a pulse which has DC variations due to the wow and flutter caused by recording and reproducing. The signal (a) is sent to the positive and negative peak value derecting circuits 45 and 46 respectively. The circuits 45 and 46 produce signals (b) and (c) to detect and hold the positive and negative peak voltages of the signal (a) and transmits these signals to a threshold generating circuit 47. The circuit 47 transmits a signal (d) having the voltage equal to the level of the mean value of both voltages of signals (b) and (c) to a voltage comparator 48. The comparator 48 compares the voltage of signal (a) with that of signal (d) and produces a binary signal of a high level if the level of (a) is higher than (d). In above-mentioned case, the original binary code signal is reproduced to obtain a signal (e), and this signal (e) is sent to a display circuit 41.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a handwritten data recording device, and particularly to a handwritten data recording device for transmitting and receiving handwritten characters and figures along with voice of a telephone call using a telephone line. A handwritten data communication device that recognizes data representing figures and sends and receives data along with audio signals from phone calls using the 1R telephone line, is equipped with a device that records the data and audio received when the recipient is absent. Recently, a handwritten data recording device was developed, and by using this device, it is possible to send and record handwritten characters, figures, and phone calls even when the other party is present, and the user's handwritten data can be recorded. It is possible to improve call efficiency and call speed.

The first diagram is a block diagram showing a configuration example of a conventional handwritten data recording device. The device in the figure includes a transmitting/receiving device 1 that transmits and receives data indicating handwritten characters and figures and voice signals of a call, a control device 6 that controls the timing of transmitting and receiving communications when the recipient is absent, and a control device 6 that controls the timing of transmitting and receiving communications when the recipient is absent. The recording and reproducing device 7 records and reproduces a frequency-multiplexed audio signal (FDM signal).

The transmitting/receiving device 1 includes a telephone 10. Terminal equipment for input/output includes a tablet (tablet) 11 for inputting characters and figures by hand, a monitor 12 for displaying characters and figures reproduced from received data on an image screen, and a hard copy machine 13 for copying onto paper. further connected to the control device 6.
&: Continued. Further, the transmitting/receiving device 1 is connected to the telephone line via the input/output terminal 8, and the recording/reproducing device 7 is connected to the input/output terminal 8 via the transmitting/receiving device 1.

As mentioned above, data and audio signals are frequency multiplexed, and for example, out of the audio band from 300 Hz to 3,400 Hz, the band from 300 Hz to 1,800 Hz and the band from 2,600 Hz to 3,400 Hz are used as the audio signal band. The band from 2000 hertz to 2400 hertz is defined as the data band. During a call, the audio signal sent from the transmitter of the telephone 10 passes through the audio circuit 21 of the demultiplexing circuit 2, and the frequency components within the data band are sufficiently attenuated by a band rejection filter provided in the audio circuit 21. The signal is sent to the coupling/separating circuit 23. Also, during a call, the tablet 11 sends a signal indicating the coordinates of input characters and figures at each time to the data transmitting circuit 3, and in the data transmitting circuit 3, the encoder 31 converts the received coordinate signal to a predetermined time. The converter 32 samples each signal, converts it into a binary code, and sends it to the converter 32. The converter 32 sends a frequency shift modulated signal (FSK signal) using the binary code signal to the data circuit 22 of the demultiplexer circuit 2. . The data circuit 22 is equipped with a band-pass filter, and sends the data in which the frequency components of the audio signal band included in the signal are attenuated to the coupling/separating circuit 23. The FIJN signal, which is a superimposition of the audio signal sent from the circuit 21 and the data sent from the data circuit 22, is sent from the input/output terminal 8.-The PDM signal sent from the other party is combined. The signals are separated by a separation circuit 23 and sent to both an audio circuit 21 and a data circuit 22.The audio circuit 21 uses a band rejection filter to attenuate frequency components in the data band included in the FD and M signals, and outputs the audio signal. The 0 data receiving circuit 22 that sends the data to the telephone 10 extracts the frequency component of the data band included in the FDM signal using a band pass filter and sends it to the data receiving circuit 4.
Then, the demodulator 42 demodulates the received signal to F8, slices it at a predetermined level, and sequentially stores it as a binary encoding signal in the display circuit 41's memory. Generates a signal for image display according to the contents stored in the computer and sends it to the monitor 12 or node copy machine 13 to display the characters and figures inputted by the other party on the image screen, or
Copy it on paper. Note that when characters and figures are input from the tablet 11 and sent to the other party, the data is sent from the data circuit 22 via the coupling/separation circuit 23 and sent to the data receiving circuit 4 to monitor the content of the transmission. It can be displayed and monitored on 12 image planes.

When the recipient is absent or is off-line other than during a call, by switching the operating state of the control device 6, the recipient can respond to the recipient's call in the absence and send the IJN. The signal can be recorded in the recording and reproducing device 7, or the recording and reproducing device 7 can record and reproduce the signal in an offline state.First, when the ejection signal is received when the receiver is not present, the control device #, 6 connects the coupling/separating circuit 23. A control signal is sent to the control circuit 6, a response signal is sent out from the input/output terminal 8 to close the communication path, and then the control circuit 6
The magnetic tape recorder inside starts up and plays the pre-recorded audio signal, and the audio signal for informing the other party of the recipient's absence and for requesting transmission is sent from the input/output terminal 8 via the coupling/separation circuit 23. send it out. Furthermore, the control device 6 activates the recording operation of the recording/reproducing device 7 to record the FDM signal sent from the other party. When the B'DM signal sent from the other party is interrupted for a predetermined period of time or more, the control devices M and 6 consider that reception has ended, stop the recording operation of the recording and reproducing device 7, and return to the reception standby state.

When offline, the control circuit 6 connects the coupling/separating circuit 23
A control signal is sent to the terminal 8 to prevent a calling signal from being transmitted from the input/output terminal 8 when the handset of the telephone 10 is picked up. In this case, by switching the operating state of the control device 6, either the recording or external operation of the recording/reproducing device f7 can be selected and started or stopped. This off-line operation allows you to record Niyuso fI while you are away.
Regenerate the received FI)N signal recorded in t, 7,
monitor 12 while listening to the call from the receiver of the packing machine 10.
You can see letters and shapes. In addition, in offline operation, it is also possible to record a telephone call and a character/figure to be sent to the other party in the recording/reproducing device 7 in its entirety. When transmitting this pre-edited and recorded FDM 1M number during a call, the control device 6 sends a control signal to the recording and reproducing device 7 to start the reproducing operation, and the externally generated FDM 1M number is transmitted.
The N signal is sent out from the input/output terminal 8 via the coupling/separating circuit 23.

The conventional handwritten data recording device i1 described above has the advantage of improving call efficiency for users by utilizing the functions of the non-recording device 7, but on the other hand, the recording and reproducing device 7 is It has the disadvantage that it is expensive because it requires high performance. The recording/reproducing device 7 is a magnetic tape recorder, and during operation, it produces wows and rattles due to irregular rotational unevenness and slips of the tape drive mechanism. Because of this wow and flutter, the FL recorded and played back
) Nth, if the frequency deviation exceeds a predetermined limit, a reception error p occurs. That is, the demodulator 42 of the data receiving circuit 4
demodulates the received F8K signal and then slices it at a predetermined level to make it into a binary embossing signal.
When demodulating the F 8 K signal that has a frequency shift due to 7 ripples, it becomes a 2-channel signal in which the DC component fluctuates over time, and when the fluctuation of the DC component exceeds a predetermined limit, the demodulated signal is slice-shaped. The resulting binary signal will be different from the original value.Furthermore, the frequency shift due to wah and 7sik will be added each time the FDN signal is recorded and played back.For example, when the other party records and plays offline Did F
If a DM signal is received and recorded when the user is not present, and then reproduced off-line, there is a possibility that a frequency shift of 02 times the frequency shift caused by - times of recording and reproduction may occur. If a high-performance magnetic tape recorder with less wow and flutter is used to avoid the above-mentioned data reception errors, the price of the recording/reproducing device 7 will increase.

SUMMARY OF THE INVENTION An object of the present invention is to provide a handwritten data recording device that eliminates the above-mentioned drawbacks and can reproduce handwritten data without requiring an expensive high-performance recording and reproducing device.

The device of the present invention includes an encoding circuit that encodes a coordinate signal given from a handwriting input means and generates a two-transmission signal, and a modulation circuit that sends out a data signal in which a carrier wave is modulated with the same wave number by the two-transmission signal. a transmitting means for transmitting a multiplexed signal in which the data signal is superimposed on a voice signal given from a telephone; a separating circuit that receives the multiple rL@ signal and separates it into the voice signal and the data signal; In a handwritten data recording device, the handwritten data recording device includes a demodulation circuit that sends out a demodulated signal, a receiving device that generates a display signal according to the demodulated signal and sends it to a display device, and a recording device that records and reproduces the multiplexed signal. , the receiving means includes a waveform shaping circuit that removes DC fluctuation components from the demodulated signal and shapes it into a two-channel signal.

Next, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a pull diagram showing one embodiment of the present invention. In the apparatus shown in FIG. 1, data reception by the transmitter/receiver 9 is the same as in the apparatus shown in FIG. 1, so a description thereof will be omitted. The data receiving circuit 14 includes a demodulator 43, a shaping circuit 44, and a display circuit 41. The demodulator 43 uses a phase-locked loop (Pi, L) to demodulate the F8 signal received from the demultiplexer circuit 2 and sends it to the shaping circuit 44. The shaping circuit 44 removes DC fluctuation components contained in the demodulated signal, performs slice shaping, and converts the demodulated signal into a binary code signal, which is then sent to the display circuit 41 . Display circuit 41
As in the case of FIG. 1, an image display signal is generated and sent to the monitor 12 or hard copy machine 13 to display or copy characters and figures, respectively.

FIG. 3 (IJ and (bJ) are a block diagram illustrating one configuration example and a waveform diagram illustrating the operation of the shaping circuit 44 in FIG. There may be cases where the original 200 million code signal cannot be reproduced.

The signal a is sent to a positive peak value detection circuit 45 and a negative peak value detection circuit 46 as well as to a voltage comparison circuit 48. The positive peak value detection (9) circuit 45 and the negative peak value detection circuit 46 detect and hold the positive and negative forward voltages of the signal layer, respectively, and generate signals S and C to generate a threshold value. 0 threshold generation circuit 47 sending to circuit 47
48, which has a voltage that is close to the average value of the voltages of both signals S and C, compares the voltages of the signal layer and d, and when the former is higher (or lower) than the latter, it is a high level (or low level). A two-transmission signal is generated to reproduce the original binary stamping signal, and this is sent to the display circuit 41 as a signal e.

By using this shaping circuit 44, in the device shown in the mEz diagram, it is possible to use an inexpensive hepinaural magnetic tape recorder as the recording and reproducing device 7, and to remove the shadows of wah and 72 ivy and receive data without errors. , can correctly display or copy sent characters and figures. In addition, Figure 3 (
The shaping circuit 44 shown in a) is merely an example of the configuration, and is not limited to this; similar effects can be obtained by using a circuit with another configuration that has the function of detecting pulses having DC fluctuations. It will be done.

As explained above, the present invention includes a circuit for shaping waveform distortion caused by wow and black in a recording/reproducing device, and allows handwritten data to be processed by w/o without the need for an expensive high-performance recording/reproducing device. This has the effect of realizing a handwritten data recording device that can be reproduced with less effort.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional handwritten data recording device, FIGS. 2 and 3 are block diagrams showing an embodiment of the present invention, and FIG. It is a waveform diagram showing the operation of the circuit. 1.9... Transmitter/receiver, 2... Demultiplexer circuit, 3... Data transmitter circuit, 4.14...
... Data reception image, 42.43 ... Demodulation circuit, 44 ... Shaping circuit, 41 ... Display circuit, 6 ... Control device, 7 ...Recording/playback device, 10...Telephone, 11...Taplets), 12...Monitor, 13...
No. 1 - Tocobee machine.

Claims (1)

[Claims] 2 by encoding the coordinate signal given from the handwriting input means.
It has an encoding circuit that generates a value signal and a modulation circuit that frequency-modulates a carrier wave with the binary signal and sends out a data signal, and superimposes the data signal on the voice signal given from the telephone and transmits a nine-multiplex signal. The apparatus comprises a transmitting means, a separating circuit that receives the multiplexed signal and separates it into the audio signal and the data signal, and a demodulating circuit that sends out a signal obtained by demodulating the MiJ data signal, and generates a display signal according to the demodulated signal. In the handwritten data recording device, the handwritten data recording device includes a receiving means for generating and transmitting the signal to a display means, and a recording means for ac recording and reproducing the multiplexed signal, wherein the receiving means removes DC fluctuation components from the demodulated signal and converts the demodulated signal into a binary signal. A handwritten data recording device characterized by having a waveform shaping circuit for shaping.