All of us know that the modern technology ap- < plied to telecommunications, makes possible the transmission of information ' ** 5 through telephone, allowing the usage of frequency band of the voice for tranjs mission of information by means of a numerical codification.

By using the above-described technique and the mentioned transmission mean, this Patent of Invention is concerned to a sono - rous electronic device, which has the purpose to emit a numerical code through 10 a telephone line, being formed by a sonorous transmitter, in a shape of a card or other portable form and a receiver connected to a telephone line which ' receives the^signals emitted by the transmitter decoding them into numbers on a numerical display.

The sonorous card is connectable to a telepho- 15 nic mouth piece anda has an electric code internally and permanently recorded, which corresponds to the numerical code of the card.

The sonorous card receives a command and emits sonorous signals, transmitting therefore the signalling by telephone line ' through its transmitter cartridge. ^' ZO. When,the receiver is connected to the telepho¬ nic terminal to which the telephone call was made, it receives the signalling transforming it into numerical code of the card in visible manner on a numeri¬ cal display.

The sonorous card is specifically a sound ' 25 transmitter, compactly built in the shape of a card, in order it can be carri¬ ed in the user's pocket, wallet, briefcase, etc.

The energy for the functioning of the card or sound transmitter is furnished by.batteries of that type used for watches and electronic calculators, with a duration of one year in virtue of the low ' 30 consumption of energy of the transmitter.

The numerical code is recorded in the form of Λ electric codification with permanent memory by the supplier company of sono¬ rous cards and there are no possibilities for the mentioned code be erased or modified by its user not even when the battery is discharged. 35 When the command is operated, the electric co¬ de, previously recorded, will control the oscillators which emit a sequence of tones that will be converted into sounds through an electric-acoustic transduc tor which is inside the sonorous card.

The transductor can be of the piezoelectric ty 40 pe because it has a low consumption of energy and high acoustic efficiency.

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The method used for transmission of signals ' through a telephone line is that of the modulation by displacement of carrying frequency, called FSK (Frequency Shift Keying) or other similar method genera¬ lly used for transmission of information through telephone lines, considering that this method combines two tones or frequencies contained in the voice band and they represent in an adequate sequence a numerical signalling.

When the tones are in the audible band, the ' telephonic cartridge ^" picks up the sounds emitted by the card and converts them into electric signals which are transmitted to the other end of the line where the receiver is connected.

The receiver is connected to a telephonic ter¬ minal which is used to receive the user's code.

Upon receiving a telephone call, made by the ' card's user, from any other telephonic terminal, the receiver is prepared to decipher the signals emitted because it has a device for tone reconnaissance ^* and a decoder which converts the signalling into numbers shown on a numerical display which will identify the numerical emitted.

There is also in the receiver an identificati¬ on system of errors that verifies any error in the reception caused by noises in the telephone line or by sonorous interference in the telephone cartridge ' in which the signalling is being inserted.

The error verification is made by the compari¬ son of standardized signals which must follow the signalling, observing that ' if the standardized signals did not arrive in the adequate form, the receiver' will not show any numerical code, or shows an indication of incorrect code and in such case the user must transmit his code once again.

The numerical code of the card could be made up by the telephone number of the user, including his area code, which usually requires ten numbers, being seven numbers of the telephone and three of the ' area code. The codification can have a higher or lower number, evidently depe ding on the enumeration adopted.

Each number is codified in four states and ' each one of them can be in two conditions.

The combinations of the four-states represents sixteen numbers and as the numbers from 0 (zero) to 9 (nine) are interesting , six combinations will not be valid because they will be identified on the re¬ ceiving and will also contribute for error identification.

Eight control states are introduced into the signalling transmitted which are generated from the transmitted data and each state could be in two conditions being tested in the reception for verification

of the errors. This technique of error detecting is usually called "Parity Ve¬ rification" and it is commonly used in data transmission.

The system of transmission and reception used in the sonorous card is planned to reject interferences that cause errors in ^ 5 the ^' identification of the code. However in the event of too intense interfere^ ce besides the rejection by the equipment, the system of error identification will reveal the failure classifying the errors in two categories, that is, low level errors and high level errors.

The low level errors are caused by interfere^ 10 ces in telephone line or by noises introduced into the telephone cartridge if the sonorous transmitter card is too far and the place of transmission is too noisy.

Evidently that within a certain tolerance, ' such interferences will be rejected, however, in case that it does not happen, 15 the transmitted message will be lost and the user would have to transmit it again.

Low level errors are not highly ^' detrimental be cause the most that could occur would be the fact that the user would have to transmit his code again with a loss of time inferior to one second.. .20 High level errors are prejudicial to the sys - tern and are caused by a sonorous and electric casual interference, received by the receiver and presenting an incorrect code wich is highly detrimental but ' there is only a remote possibility of such occurrence.

The sonorous card is secure from message failjj 25 re or loss.

A message failure could cause the reception of a wrong code, which would incorrectly identify the user. Such problem is alrea^ dy minimized by the system of error identification- and could be totally solved with the emission of multiple messages. 30 Therefore, on operating the transmitter the ' user would send several times his code and the receiver would verify the coin¬ cidence of messages and so the possibility of any noise send a wrong code to ^"* the receiver would be eliminated.

The problem of loss of the card and its undue 35 use by another person is solved because there is in the card a numerical key - board and only its bearer knows his security code and can press it on the key¬ board.

Correct sonorous pulses will only be propaga - ted by the transmitter card if the correct security code is pressed on the nu-

40 merical keyboard.

If a incorrect security code is pressed on the

-4- numerical keyboard the card will emit incorrect sonorous pulses which are not accepted by the receiver.

This characteristic is useful to make diffi - cult unauthorized persons to find out the security code. Therefore whenever a sequence of numbers is pressed down, the card will emit sonorous pulses, being impossible to diffe - rentiate by ear the correct sonorous pulses from the incorrect ones.

"THE SONOROUS CARD FOR NUMERICAL CODIFICATION

THROUGH TELEPHONE LINE" was planned in order to perform a series of functions with the aid of a telephone line, for example, telephone calls to be paid by the card's user, request of bank account balance by telephone, purchase by telephone, etc.

For each of such different functions there is a control number of function which will be pressed on the card by the user ' after having pressed down his security code. The control number of function ' will be interpreted where the receiver is placed.

Each user could have his card previously pro¬ grammed for one or more functions, being impossible its use in functions non- programmed since the card will not comply with the command. "THE SONOROUS CARD FOR NUMERICAL CODIFICATION

THROUGH TELEPHONE LINE" object of this Patent of Invention could be better ' understood through the annexed drawings, as follows:

Figure 1. It shows a schematic view of the ^* utilization of the sonorous card or sonorous transmitter (1) coupled to a ' telephone mouthpiece and emitting sonorous signals through the telephone line to the receiver (2) connected to the terminal to where the telephone call was made and that upon receiving the signalling converts it into a numerical code in a visible form on the numerical display (2-A). The sonorous card (1) has a numerical keyboard (3). Figure 2. It shows a diagram of blocks of the sonorous card or sonorous transmitter (1) with a numerical keyboard (3), iden_ tifier for correct code (4), controller (5), main oscillator (6), code regis¬ ter (7), tone generator (8), amplifier (9), transductor (10) and the telepho¬ ne mouthpiece where the sonorous card or sonorous transmitter is coupled. Figure 3. It shows a diagram of the blocks of the receiver (2) with the telephonic terminal where the receiver is connected, the amplifier (11), tone identifier (12), controller (13), main oscillator ( 14), decodifier (15), error identifier (16) and numerical display (2-A).

"THE SONOROUS CARD FOR NUMERICAL CODIFICATION TELEPHONE LINE" gives the identification of an electronic card and consequen-

-5- tly its user through the numerical code of acoustic signals emitted by the ' card and detected and identified by a detector equipment, placed at any distaji ce through an acoustic communication channel, as the telephone. It is useful ' for telephone calls to be paid by the card's user, request of bank accounts ba _^ lance by telephone, shopping by telephone, etc.