UA70375C2 - Method for transmitting buadot tones (variants) and a device for the realization of the method - Google Patents

Abstract

A method used to encode/decode a low activity communication signal - such as a Baudot tone - for transmission . over a telecommunications system (100). Тhе telecommunications system (100) may include any number of wireless links. Once the system (100) is noticed that a low activity signal needs to be transmitted each vocoder used in the system (100) to encode/decode the signal performs a unique encoding/decoding process. In one embodiment, frames containing errors adversely affecting a signal are delivered to the vocoder and the “soft bits” contained therein are used to determine the original signal transmitted. In another embodiment, encoding of the signal may include encoding the signal using redundancy with the encoded signal being spread across multiple vocoder frames.

Description

Description of the invention

The invention relates to telecommunications devices for the deaf (PTG) or text telephone units (TTB), 2 in particular, to modifications of standard vocoder operations to ensure reliable transmission of PTG/TTB signals in a communication system, including wireless communication channels.

Many deaf and semi-deaf people use specially designed communication system terminals to communicate over telephone lines. Such devices (PTG) or text telephone blocks (TTB) are collectively called

PTG. Usually the PTG includes a keyboard and display connected to the telephone line through a modem built into the PTG. 70 The modem is connected either directly to the telephone line or through an acoustic adapter with a regular telephone handset. PTGs transmit information to other PTGs using a tone code that is received by another modem. Such codes are called low activity communication because the frequencies and amplitudes are relatively constant.

The codes and protocols used in PTG are idiosyncratic. A set of codes known as Bodot codes and communication protocols were created at a time when most communication devices for the deaf were based on 72 mechanical and electromechanical components rather than electronics. Therefore, PTG protocols have a number of limitations that are not significant for modern devices. These limitations make the protocols and devices running on such protocols somewhat archaic.

Usually, communication via PTG is carried out at a speed of 50 baud (45.5 baud in some countries), that is, 6 characters per second. Other protocols provide higher speeds (AZSI and improved Bodo protocols). A set of 5-bit characters is used for communication via PTG. They are like the letters of the alphabet, in which each letter represents a word or idea. The sign is grouped with service bits before transmission. Groups have a duration or transmission interval of 22ms. According to the usual PTG protocol, a group includes 8 bits: a start bit, 5 bits representing a sign, and at least 1 and 1/2 stop bits, i.e. end bits for the group.

Compared to modern transmission systems, PTGs have a snail's pace. The main problem is that c PTH signals are essentially constant. These slow, monotonous signals can wreak havoc on digital high-speed (9) communication systems that transmit high-activity signals, especially in systems with wireless links.

An example of such a system is a system with parallel access and code compression of channels (PDKU), which includes a large number of wireless subscriber devices. Each such device has a transceiver and maintains communication in the system through satellite repeaters and ground stations called cells. Each cell has a physical device called a base station. A cell covers a limited geographic region and directs connections between subscriber devices in the communication network through a mobile switching center (MSC). When the subscriber moves to the territory of another cell, the subscriber's communication session can be redirected to the new cell by a procedure called "handover". Ha")

The subscriber device, which is usually called a cellular phone, transmits a signal that is received by the base station (hereinafter referred to as the base station). The signal is relayed to the KCM, which directs it to the utility switchboard in the telephone network (KKTM), which includes telephone lines or other subscriber devices. In a similar way, the signal can be transmitted from the KKTM to the subscriber device through the BS and KCM.

The interface between the subscriber device and BS is called an air interface. The Communications Association (TIA) "introduced the signal processing standard PDKU I5-95 (Compatibility standard of mobile and base stations for C cellular systems of a wide spectrum of dual mode). Bulletins of the Telecommunication Service (TV) are attached to I5-95.

Из» The service mode is an important factor in the successful transmission of signals, especially low-active signals

PTG, in digital communication systems. In modern systems, including the one mentioned above, one of the problems is related to the vocoder - a device designed to encode the voice or analog PTG signal. The vocoder has difficulties in processing a substantially monotonous low-speed signal that corresponds to the PTG protocol. In addition, there is no method or device for informing the communication system that PT signals have been received and therefore av | corrective actions needed to successfully transmit the low activity signal must be performed. In modern systems, a low activity communication signal such as a PTH signal will likely be perceived by the vocoder as background noise or interference and will be ignored. -and 20 There is a need for a method and device that can be easily integrated into existing communication systems and can reduce the frequency of frame errors by using a protocol for vocoders during the transmission of low activity sl signals.

This method and device must be compatible with PADCU systems and with the types of modulation in systems serving a large number of users. The most complete discussion of PDC systems and similar procedures in parallel access systems can be found in US Pat. No. 4,901,307, incorporated herein by reference. In addition, these methods

HF) and the device must be compatible with other modulation systems, such as time division, frequency division, and amplitude modulation systems. Generally speaking, the invention provides for the modulation of low-active signals by a communication system using coded signals and increasing the level of transmission power. In particular, the invention includes a method that involves 60 specialized coding, decoding or both of a low-active communication signal to minimize the frequency of frame errors of the transmitted signal. The invention also includes decoding a low-level signal using "soft bits" of an erroneous frame or in frames adjacent to it to determine the content of the original frame.

Some embodiments of the invention provide for unique methods of decoding a PTH signal encoded according to a standard protocol. In one embodiment, the decoder can compare the false frame with the vocoded frame of a known PTG signal and determine the most likely vocoded frame that was transmitted. In another embodiment, the decoder may scan adjacent frames to determine the most likely content of a vocoded transmitted frame received with errors. In yet another embodiment, the decoder may have a signal enhancer or repeater that cleans up corrupted bits in the transmitted frame before it is decoded. Although this document relates to PTH, the invention can be applied to any other slow or low-activity signals.

Another embodiment provides the already mentioned decoding, but with non-standard parameters. When receiving a PTH signal, the encoder goes into "Bodo coding mode", notifies the decoder of the protocol change, and uses channel coding redundancy to increase the probability of detecting the original PTH signal sent, even if it is contained in an incorrect frame. This implementation involves replacing the standard 7/0 Vocoder parameters with vocoder "signatures" with better resolution, making it easier to distinguish tones.

One embodiment provides for encoding the PTH signal in vocoder frames with redundancy, but with encoding of several such frames. The information of M frames is subject to interleaving, and therefore, when a frame is lost, the decoder can obtain the necessary information from adjacent frames and thereby determine the content of the lost frame.

Another embodiment provides an economical system for combining the above-mentioned encoding and 7/5 decoding methods with transmission power control methods. Modification of the standard vocoder microcircuit in the BS is an expensive operation, which complicates the application of the above-mentioned encoding and decoding methods. However, a system can be created that will allow the mentioned methods to be used in the BS, but not in the mobile station (MO).

Controlling the transmission power allows to minimize the frequency of frame errors in low-active signals transmitted from the BS to the unmodified vocoder of the MS.

The invention provides the user with a number of advantages. One of them is that the PTG message can be transmitted over wireless digital channels. Another advantage is that the PTG can be connected to a mobile or subscriber device, such as a cell phone, which has a wireless connection to the system. Other advantages of the invention are given in the further description with reference to the drawings, in which: Fig. 1 illustrates one type of communication system, which includes wireless channels and a PTG communication device, Fig. 2 - a typical existing PTG, which is used according to with one of the embodiments of the invention, Fig. 3 - the frame format of the information channel for a set of 1 transmission rates, which is used by i) a variable speed vocoder, Fig. 4 - a diagram of the algorithm of the method according to one of the embodiments of the invention, Fig. 5 - a block diagram of a wireless of a communication system that has a structure according to one of the embodiments of the invention, using Fig. 6 - a block diagram of a wireless communication system that has a structure according to one of the embodiments of the invention, and Fig. 7 - a diagram of the transmission power control algorithm between BS and MS. -

Fig. 1 illustrates one type of communication system 100, which includes wireless channels and PTG 200 according to the invention. The PTG (fig. 2) usually includes a keyboard and display connected to the telephone line through a modem built into the PTG. The modem is connected either directly to the telephone line, or through an acoustic adapter with an ordinary telephone handset. PTGs transmit information to other PTGs (for example, 102 in Fig. 1) using a tonal code, which is received by another modem.

In a digital communication system with wireless channels, the PTG 200 can be connected to the subscriber device 104, which is used in the system 100 to transmit the received signals. A typical subscriber device 104 is a digital cellular telephone, for example, of the 0-800 type from Ocaisott IPS. Subscriber device 104 (Fig. 1) includes a notification device 106 that communicates with the circuit of the subscriber device 104. Equipment 108 can be used to connect the PTG 200 to the subscriber device 104 through the device 106, or the input port/ exit Examples of such signaling devices and ports can be found in the application for ;" US Patent 09/114,344 dated 07/13/1998, incorporated herein by reference. The port of the device may be adapted to accept such common and available means of connection as a plug or connector. Connection through a port

Provides connection of a low-active communication device (not shown), for example, PTG, to the subscriber-I device 104 of the communication system 100. Such a connection ensures the exchange of information between the low-active communication device and the subscriber device 104. Regardless of the connection method, the notification device 106 informs the system about the need to transmit PTG signals. оо After the notification device 106 receives a low-activity signal, the subscriber device 104 processes this signal. In general, the signal for transmission includes the information contained in the low-level signal. Since the system 100 has been informed of the transmission of a low-level signal, the system adapts to provide a transmission suitable for decoding. For example, an analog signal received from the analog circuit 228 (Fig.2) usually undergoes processing that includes digitizing the signal, setting the appropriate transmission power level to protect against fading, compressing the signal, and filtering. These functions can

Execute schemes of the subscriber device 104, including the vocoder. Depending on the received signal, the variable rate vocoder can dynamically determine and coordinate service in system 100 to provide

F) successful signal transmission and decoding. Tuning includes setting the values of many parameters, such as the vocoder rate, transmission power, and compression method. More detailed information on processing can be found in the IZ-95 standard and other transmission standards, including the vocoder standard protocol.

When receiving a low-activity signal, the vocoder may identify it as noise, as a pause, or as a signal not intended for transmission, meaning the vocoder does not know what service is required because it cannot identify the signal. By informing the system 100 about sending a low-activity signal, the vocoder determines the type of service that provides the best transmission and decoding of the signal. 65 After processing the low-active signal and determining the service, this signal can be transmitted by the antenna 112 in the wireless channel 114. Another station, for example, the BS 118 receives the digital signal by the antenna

116 and processes it using the BS circuits, including the vocoder 120. The BS circuits of communication systems are well known and standardized in I5-95 (see above). In the process of processing the received signal, the information carried by the low-active signal can be sent to the low-active device 102 through the communication channel 106. This ensures that the low-active signal is sent from the device 102 back to the PT 200.

Channel 120 is shown broken to emphasize that the BS may not have direct communication with the low-active device 102. Typically, the BS 118 communicates with a standard KKTM switch designed to coordinate telephone calls, and the device 102 communicates with the KKTM. In another embodiment, a second MS (not shown) can communicate with the BS, which communicates with the device 102. In addition, the communication system can have a KCM, as already noted in 7/o.

Fig. 2 contains a block diagram of a typical PTG 200, standard or improved, which works according to the invention.

The user can enter message characters from a keyboard 202 connected to a processor 204 that controls the circuit components. Received or transmitted letters are displayed on display 206, and optionally printed by printer 208. Some PTGs do not have a printer, but always have a display. Thus, the keyboard 202 serves as a source of input data for the processor 204, and the display 206 and/or printer 208 serves as a local destination for the stream of input characters.

The processor 204 can be connected to a suitable data and address bus, which is a typical solution for systems of this type. Bus 210 connects PZP (KOM) 212 and non-volatile random access memory MUKAM 214. Both KOM 212 and MMKAM 214 work under the interactive control of processor 204, connected to them by lines 216, 218.

KOM 212 is intended for permanent storage of programs that control the processor 204, as well as for storing some data for these programs. An example can be a special sequence of symbols for inter-machine communication and synchronization of two PTG in the improved mode. MUKAM 214 is used as a buffer, a temporary storage location for data coming to or from PTG 200 and standard messages entered by the user to speed up access. Other circuits can be used, for example, with the combination of Microprocessor 202, KOM 212 and MUKAM 214 circuits in a single microcircuit.

A digital keyboard 220 is also attached to the processor 202, which allows dialing a telephone number for i) transmission by the processor 204 to the communication system 100. The socket 226 holds a standard telephone handset 224 and has a built-in switch (not shown) that indicates whether the handset 224 is off-hook for use.

The processor 204 communicates with the system 100 through an analog circuit 228 and a line 230, instead of which any other type of communication channel can be used. Providing this connection, the analog circuit 228 enables the system to receive 100 Bodo tones and tone dialing. Circuit 228 creates an interface for - voice information to and from handset 224. Analog circuit 228 of PTG 200 connects to system 100 through the connecting device described above.

Despite the above description, it is clear to a specialist that the invention can be applied in communication systems of other types. For example, a multiple subscriber device 104 can communicate with the BS, or the PTG 200 can be integrated into the subscriber device 104.

After receiving the PTH signal, the vocoders used by the system 100 in the signal processing process detect that the low-level signal has been received for transmission and can be transmitted using the 1/8 rate information frame format. As noted below, this method can be adapted for 1/4 speed. z c Fig. 3 illustrates the frame format of a typical variable rate vocoder for the information channel z . using a set of 1 transfer rates. Such a vocoder forms a frame every 20ms using the code linear forecasting, known to specialists. Depending on the voice activity, frames can be generated in the format of full speed, 1/2, 1/4 or 1/8 speed. When receiving a Bodo tone, a variable speed vocoder

Usually detects low activity and uses the 1/8 format if a modern standard vocoder can -AND detect that a signal has been sent. Usually the Bodot signal is treated as noise and ignored.

Full rate is used when no bits of the frame are repeated. A rate of 1/2 accounts for the case where the same number of bits are sent, but each bit in the frame is repeated once, ie 2) appears twice in the frame. At 1/4 speed, each bit appears in the frame 4 times, etc. The more such 5p repetitions in the frame, the less information it carries. A full-rate signal is sent with higher power - because each bit is sent only once. The power at full speed is considered as a reference. At lower baud rates, transmission power is lower because it accumulates over the course of a frame for each bit. If the transmission consumes a fixed minimum power, a transmission at full speed will produce more frame errors than a transmission at 1/2 power, while transmitting the same amount of Information.

Usually, the power level is set based on the chosen frame error frequency (FFR) in the signal received by the recipient of the transmitted signal, for example, a remote device. The desired FFR is chosen because when transmitting a low-active signal, the actual FFR increases when using existing methods.

The chosen CCP is from 0.195 to 195, but it can be higher or lower if it is necessary to preserve the quality of the transmitted signal. It is desirable to have a CCP of 0.295 for low-active signals.

According to the invention, the use of special coding and decoding allows control of the electronic control system. If this does not provide the desired CCP (ie, the full number of false frames already after recovering the vocoder frame information), power level correction can be used along with special encoding and decoding.

Usually, vocoders work at full speed and when transmitting low-active signals, the transmission power of 65 will increase. It should be noted that any such increase will be less than what is needed if these encoding/decoding methods are not used.

In one embodiment, when receiving a PTG call, the system 100 detects the type of call or is informed about it.

System 100 processes the call to PTG 200 using standard procedures. After receiving the frame, for example, in BS 118, the call is decoded according to the invention. If a frame error is detected at the physical level, that is, if the frame does not pass the checksum check provided by IZ-95, the frame is still sent to the vocoder 120 for decoding, which is not provided by I5-95. Bits of an erroneous frame are considered as "soft bits", since not all of them can be erroneous and to restore the information of this frame it can be obtained from them individually.

Having detected a PTH call or received information about it, the vocoder decoder according to the invention processes 70 false frames based on the received vocoder parameters and comparing these parameters with the "signatures" of PTH-modulated signals or tones represented in the parameter space. Hereby, the vocoder parameters of the stored vocoded PTG tones are compared with the received ones. The results of this comparison make it possible to determine which PTH signal was most likely received.

For example, let's assume that the Bodot tone "0" is represented by a sequence of sixteen "0s", and the Bodot tone "1" is represented by 7/5 Sixteen "1s". According to the invention, they are considered as signatures of the voice parameter space. For further examples, the three levels are defined as follows: vocoder frame boundaries: | - voc. frame'"M - Bodo tone limits: | - bodo X - | and accepted vocoder parameters: 0000000000000000 or 1111111111111111.

Suppose that the vocoder decoder accepts the following parameters: (false frame) - voc. frame 1 - | - voc. frame 2 - | - voc. frame Z - | - voc. frame 4 - | vok.

K1- | - bodo"0 - | - bodo"!" - | - bodo"i - | - bodo0 - re 11111111100000000000000000000000000000110000111111111111000000000000000 cm

AAAAlA Geh) (frame errors!

The decoder recognizes the boundaries of the Bodot tone and finds that the accepted parameters for the second Bodot "0" are closer to "0" than to "1" and decides that it is a Bodot tone "0" and then modifies the suspect bits before decoding. For the next tone

A Bodo "1" decoder detects that the vocoder parameters are closer to "1" than to "0" and modifies that) bits accordingly. After that, the decoder uses the following M sequence to decode and receive the corrected PTH signal: (corrected frame) so

I-vok, frame 7 - | - voc. frame 2 - | - voc. frame Z - | - voc. frame 4 - | vok, av gt- Go - bodo"0 - | - bodo"b - | - bodo"y- | - bodob -| them 111111110000000000000000000000000000001111111111111110000000000000000

From this example, you can see that the changes appeared on the edge of the frame, which does not always happen. If these changes occur within a frame, another version of the invention may be used. "

In this case, the vocoder can review adjacent error-free frames to recover the false one. These frames contain some of the Bodot tone lost in the false frame. Let's assume that the signal was received: Z s wrong frame) :z» | - voc. frame 1 - | - voc. frame 2 - | - voc. frame Z - | - voc. frame 4 - | vok. - And - perhaps 0 - | - bodo"'9 - | - bodo"" - | - bodo"09 - 11111111000000000011111111111111110000000001111111111111110000000000000000 -I lAAALAALLALA (frame errors) o Vocoder parameters for the second tone (5 tones) are not defined for making the exact decision, since this number is not determined by Bodoby. 0 is almost equal to the number of 7 in the vocoder frame parameters. For a better -1 50 determination, the vocoder looks at the next adjacent frame (voc. frame 3) and finds that the tone continues in this frame, and therefore the decoder decides that the second half of frame 2 contains tone'0'. sl According to the algorithm scheme Fig. 4, after detecting the reception of a low-active signal (operations 402, 404), the decoder monitors and updates the limits of the received Bodo tone (operation 408). Otherwise, the signal is processed by conventional methods. If the received false frame was detected at the physical level, the frame is assigned indicator M and the vocoder analyzes this frame (oper. 410). If a statistically reliable decision can be found about the value of the Bodot tone in the CO or "1 frame, equivalent to the case where the frame parameters are clear, then the false o frame is modified according to the decision parameters. Statistically reliable is a decision that provides the desired i) probability of obtaining the original parameters of the frame. According to the invention, this probability should be equal to 0.51 to 1. After the modification is performed, the return to operation 402 and the determination of the next signal occurs. 60 If the operation 412 cannot achieve a statistically reliable solution, the vocoder examines the next adjacent frame (M--1-th) or (M-1-th). If this frame is error-free, operation 416 modifies the erroneous frame based on the M-1 or M-1 frame parameters. If the adjacent frame is false, the next best statistically reliable decision is made based on the parameters of the next adjacent frame M-1 and the parameters of the M frame are modified accordingly. 65 In this embodiment, the operation of the decoder according to the invention is similar to that described above. However, the coder uses "soft bits" to further reduce the CCP and increase the accuracy and reliability of signal decoding.

When the vocoder detects that Bodo tones are to be sent, it goes into "tone encoding mode

Bodo". In this mode, the encoder decides whether the value of the tone accepted for encoding is 0 or "1 and sends this decision to the decoder in the vocoder frame, using the redundancy of the channel coding to increase the probability of a correct Bodo tone by the decoder. Even if the decoder receives a tone in the wrong frame, the solution sent to it will increase the probability of detecting the sent tone.

If, for example, the encoder detects that a "1" tone should be sent, it sends a sequence of "1's to the decoder. These sequences can be of any length, but must be long enough for the decoder to work as it was described. According to this version of the invention, the standard vocoder parameters are replaced by 7/0 "signatures", which are better spatially separated and therefore more suitable for discrimination. This makes it easier to distinguish tones even in an erroneous frame.

In another embodiment of the invention, the decoder works as described above, but does not receive soft bits from false frames. In this case, if the vocoder encoder detects "1" or "0" Bodot tones, the vocoder also encodes the tones in the vocoder frame with redundancy, but the encoding may be performed on many vocoder frames. The values of Lie 7/5 are interleaved during M frames and therefore, if one frame is lost, the decoder will be able to obtain the necessary information from adjacent frames. In the following example, interlacing is considered on 4 frames, but it is possible to do it on any number of them. Suppose that the encoder detects the following Bodo tones intended for transmission:

The encoder encodes the frames for transmission to the decoder: | - voc. frame 1 - | - voc. frame 2 - | - voc. frame Z - | - voc. frame 4 - | vok. cedar 5- bodo" 7 - | - bodo"/" - | - bodob01- | - bodo 0 - || - bodo "1 - xxxxxxxxxxxxxxx 1111xxxxxxxxx111111111xxx1111111100001111111 100000000111100000001111

The parameters of each vocoder frame are segmented in such a way that in each frame four ss bits represent the detected Bodo tone. The full 16 bits represent detected Bodo tones from at least four vocoder frames: tone for frame M-3| tone for frame M-2| tone for frame M-1| tone for MI frame

For Bodo tones that do not correspond to the boundaries of the vocoder frame, the invention provides for the use of a four-bit sequence in which ХХУУ indicates that the code in the current vocoder frame corresponds to the Bodo code "Х" followed by the IC o) code "У: m

I- Vok. frame 1 - | - voc. frame2 - | - voc. frame Z - |- vok. frame 4 - | vok. with RT | - will be 0 - | - bodo0 - | - bodo"i- | - bodob - ххххххххххххОй1 Хххххххх00111111хххх0011111111110000111111110000001111 о

Modification of IC integrated circuits is an expensive operation. Therefore, one of the embodiments involves the use of the above-described encoding and decoding methods on a standard vocoder connected to a signal improver, for example, an estimator or repeater, or to another device capable of improving the signal. Alternatively, these methods can be implemented using a modified vocoder. It is clear that such a modification "may involve adding a signal enhancer function to the vocoder, i.e. evaluating the original values (0 or 40. "1) of the distorted bits received by the communication device. Fig. 5 illustrates such an embodiment of the invention. Transmission of signals from BS 550 to MO 510 is called a "direct" channel of communication, and the transmission of signals from MS 510 to BS 550 is a reverse channel. The unmodified vocoder 520 in the MO 510 "encodes the Bodot signal into standard vocoder parameters and transmits these parameters to the BS 550 in the return channel.

The modified vocoder 560 takes the encoded Bodo signal and improves it by restoring the distorted bits.

A clean version of the Bodot signal is then generated. The unmodified vocoder 580 in the BS 550 encodes the Bodot signal into standard vocoder parameters and transmits these parameters to the MC 510 in a direct channel. A modified vocoder at 530 takes the coded Bodo signal and improves it by restoring the distorted bits. A clean version of the Bodot signal is then generated. o However, the use of signal enhancers or modified vocoders in the forward and reverse channels -I 20 may be too expensive when using the methods described above. In another embodiment, the control system of the system can be reduced by using a reverse channel signal improver in the base station and control of the transmission power to correct the level of transmission power of the base station in the forward channel. In the return channel BS 655 (fig. b) restores the Bodot signal contained in the coded frame of the vocoder, according to the methods described above. In the forward channel, the BS transmits a coded Bodo signal using the power control procedure described 22 in US patent application 09/114,344, which is incorporated by reference.

GF) Fig. 7 contains a scheme of the algorithm for implementing the power control method between BS and MS. The procedure begins with operation 702 of receiving the Bodot signal in the MC 605. After that, the vocoders of the MC 605 go to full speed de (operation 704). In this embodiment, the transmission power is not reduced from the value used by the communication system for the full transmission rate (operation 710). The power level is set according to the selected CHKP at 60 reception of the transmitted signal in the MC 605. The desired CEP is chosen because when a Bodot signal is sent, the actual symbol error rate of this signal is 9-10 times higher than the CEP. The chosen CCP lies in the range from 0.195 to 195, but it can be lower if it is necessary to preserve the quality of the transmitted signal. It is desirable to have a CCP of 0.295 for Bodo signals. If the CHKP exceeds the selected limits (oper. 712), the MO 605 informs the BS 655 in the usual way about the need to lower the CHKP (oper. 706). This correction is performed by operation 708. Typically, this correction is performed by increasing the transmission power for full transmission speed, but may include correction of other parameters that affect the CCP. If the CHKP is acceptable (operation 712), signaling continues (operation 714) and dynamic correction continues in the communication system during transmission of the full signal (operation 710). When the transmission of the Bodot signal stops, the vocoders are released and the system returns to normal operation.

The given description of the desired embodiments allows the specialist to make any changes and modifications within the scope of the invention defined by the Formula of the invention. 1 12 and 116 then WE and M 104 118 120 ( (y -7 Ше 108 106 с 200 102 о щ и- 122

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Claims (17)

The formula of the invention 60 1. The method of transmission of observed Bodo signals of low activity from the first vocoder to the second vocoder in the telecommunications system, which includes: - transmission of the vocoder frame, which carries at least one part of the Bodo tone representation, from the first vocoder to the second vocoder, - reception of the transmitted vocoder frame by the second vocoder, 65 - modification of the transmitted vocoder frame if there is an error in the frame instead of discarding this transmitted vocoder frame and - processing the transmitted vocoder frame to obtain additional information that will be used to identify at least one part of the Bodo tone representation carried by another vocoder frame. 2. The method according to claim 1, which differs in that the operation of modifying the transmitted vocoder frame additionally includes: - comparing part of the transmitted vocoder frame with a known low-active Bodo bit sequence, - determining whether the result of the comparison is statistically reliable, and - replacing part of the transmitted vocoder frame by a known low-active Bodo bit sequence, if /o the result of the comparison is statistically reliable. C. The method according to claim 2, which is distinguished by the fact that it additionally includes: - if the result of the comparison in the processing operation of the transmitted vocoder frame is not statistically reliable, the processing of the adjacent vocoder frame to determine whether the adjacent vocoder frame contains errors, and, - if this adjacent vocoder frame vocoder frame is error-free, determining a representation of the low /5 activity Bodot signal defined by the bit sequence contained in the adjacent vocoder frame, and modifying the transmitted vocoder frame based on the bit sequence contained in the adjacent vocoder frame. 4. The method of claim 3, wherein said comparison results indicate statistical confidence if the probability that a portion of the transmitted vocoder frame is a known low-active Bodo bit sequence is 51 95 or greater. 5. The method according to claim 1, which differs in that the first vocoder is located in the mobile station, and the second vocoder is located in the base station. 6. The method according to claim 1, which is characterized by the fact that it additionally includes the operation of replacing the standard parameters of the vocoder with the signatures of the vocoder, and the consecutive bits contained in the signatures of the vocoder are spaced more widely than the consecutive bits contained in the standard parameters of the vocoders, and the specified operation of replacing is preceded by a transfer operation. 7. The method according to point b, which differs in that the operation of replacing the standard parameters of the vocoder additionally i) includes: - sending a message to the second vocoder about the transmission of a low-activity Bodo signal, and - encoding this low-activity Bodo signal using the redundancy of channel coding in the field using the information bits of the vocoder frame, as well as encoding the message of the second vocoder about the transmission of the low activity signal. - 8. The method according to point b, which differs in that the operation of modifying the transmitted vocoder frame c additionally includes operations: - comparing part of the transmitted vocoder frame with a known low-active Bodo bit sequence, o - determining whether the result of the comparison is statistically reliable, and c - replacing part of the transmitted vocoder frame with a known low-active Bodo bit sequence, if the comparison result is statistically reliable. 9. The method of transmission of observed low-activity Bodo signals from the first vocoder to the second vocoder in the telecommunications system, which includes: "- transmission by the mobile station of the vocoder frame, which carries part of the Bodo tone, in c - reception of the vocoder frame by the base station, - modification of the received vocoder frame by replacing the content of the received vocoder frame with a known Bodo bit sequence. - sending the modified vocoder frame to the base station vocoder, - processing the modified vocoder frame to obtain additional information to be used - AND to identify at least one part of the Bodo tone carried by another vocoder frame, and - transmitting all vocoder frames carrying tone information Bodo, from a base station with an increased transmission power level. 2) 10. The method according to claim 9, which differs in that the operation of transmitting all vocoder frames carrying Bodo tone information from a base station with an increased transmission power level includes operations: - - switching all vocoders to full speed, and sp - transmitting all vocoder frames carrying Bodo tone information with a transmission power level higher than the normal full-rate transmission power level, where the transmission power level is set to support a minimum destination frame error rate for vocoder frames carrying two Information about Bodo tone. 11. The method according to claim 9, which differs in that the improvement of the received vocoder frame by replacing the content (Ф) of the received vocoder frame with a known Bodo bit sequence additionally includes operations: ka - comparing the content of the received vocoder frame with a known low-active Bodo bit sequence to obtain a comparison result, and - replacing the content of the received vocoder frame with a known low-active Bodo bit sequence, if the result of the comparison is statistically reliable, or - if the result of the comparison in the operation is not statistically reliable, processing a neighboring vocoder frame to determine whether this neighboring vocoder frame contains errors, and, if this adjacent vocoder frame is error-free, determining the low activity Bodot tone defined by the 65 bit sequence contained in the adjacent vocoder frame and modifying the received vocoder frame based on the bit sequence contained in the adjacent vocoder frame. 12. The method of claim 11, wherein said comparison results indicate statistical confidence if the probability that the content of the transmitted vocoder frame is a known Bodo bit sequence is 51 95 or greater. 13. The method according to claim 11, which is characterized by the fact that the operation of transmitting all vocoder frames carrying Bodo tone information from a base station with an increased transmission power level includes operations: - switching all vocoders to full speed, and - transmitting all vocoders frames carrying Bodo tone information with a transmit power level higher than the normal full-rate transmit power level, where the transmit power level is set /o to maintain a minimum frequency of destination frame errors in vocoder frames carrying tone information Bodo 14. The method according to claim 13, which is characterized by the fact that the minimum frequency of frame errors of the addressee is less than 1.0 90. 15. A device for transmitting a low-activity Bodo signal in a telecommunications system, which includes: - means for encoding a frame of a low-activity Bodo signal in at least one vocoder frame, - means for transmitting at least one vocoder frame, - means for receiving at least one vocoder frame, and - extension means the content of at least one vocoder frame to reproduce the Bodo tone. 16. The device according to claim 15, which is characterized by the fact that it additionally includes: - a means of comparing the content of at least one vocoder frame with a known low-active Bodo bit sequence, - a means of determining whether the result of comparing the content of at least one vocoder frame with a known LOW-active bit sequence Bodo is statistically reliable, and is a means of replacing the content of at least one vocoder frame with a known low-active Bodo bit sequence (8). 17. A device for transmitting an observed low-activity Bodo signal in a telecommunications system, which includes: a vocoder for encoding a frame of a low-activity Bodo signal in at least one vocoder frame, - a transmitter for transmitting at least one vocoder frame, - - a receiver for receiving at least one of a vocoder frame, and so is a signal modifier for expanding the content of at least one vocoder frame to reproduce the Bodo tone. about shY | | | what and - Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2004, M 10, 15.10.2004. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. " - and? -i («c) (95) -i sl ime) 60 b5