JP2000506699A - Method and apparatus for antenna repositioning of mobile radiotelephones using injected voice signals - Google Patents

Abstract

(57) Abstract Mobile radiotelephones inject audible alignment signals into audible radiotelephone information, which are a function of the orientation of the radiotelephone antenna. The audible alignment signal prompts the wireless telephone user to reorient the wireless telephone antenna to improve alignment with the source of wireless telephone information. The audible alignment signal is preferably a function of the received signal strength of the radiotelephone information. The audible alignment signal is preferably artificial noise that is injected into the radiotelephone loudspeaker along with the radiotelephone communication signal to restore a subjective high-grade degradation state to the received radiotelephone information. . Artificial noise injection is preferably used in coded digital radiotelephone systems below which audible degradation does not occur until a threshold is reached at which communication is suppressed. Artificial noise injection can also be used in variable power base stations.

Description

Description: FIELD OF THE INVENTION The present invention relates to communication systems, and more particularly to communicating with terrestrial base stations or orbiting satellites. The present invention relates to a mobile radio telephone communication system. Background of the Invention Wireless communication systems are increasingly being used for wireless mobile communications. Wireless communication systems use mobile radiotelephones that communicate with terrestrial base stations or orbiting satellites. An example of a mobile radiotelephone communication system is a cellular telephone system. Cellular telephone systems are wide area communication networks that utilize frequency reuse patterns. The design and operation of an analog cellular telephone system is described in IEEE Transactions on Vehicular Technology, Vol. 29, No. 2, May, 1980, p. It is described in a document on page 244 entitled "Advanced Mobile Phone Service" by Blecher. This analog mobile cellular system is also referred to as the "AMPS" (AMPS) system. In recent years, digital cellular telephone systems have also been proposed and implemented using a Time Division Multiple Access (TDMA) architecture. Standards have also been set for the American Digital Cellular (ADC) architecture by the Electronics Industries Association (EIA) and the Telecommunications Industries Association (TIA). This U.S. digital cellular architecture is a dual mode analog and digital system according to EIA / TIA material IS-54B. Phones implementing the IS-54B dual mode architecture are currently being marketed by the assignee of the present invention. Different standards have been published for digital cellular telephone systems in Europe. European digital cellular systems, also called GSM (GSM), also use a TDMA architecture. As is well known to those skilled in the art, a mobile radiotelephone includes an antenna and a transceiver that receives radiotelephone information via the mobile radiotelephone antenna. In a vehicle mobile radiotelephone, the antenna is generally mounted on the vehicle body. In a portable mobile radiotelephone, the antenna generally protrudes from the portable radiotelephone housing. The correct orientation of the antenna with respect to the radiotelephone communication signal is important for unambiguous reception without distortion or dropout. As is well known, slight reorientation of the antenna often provides a clear improvement in radiotelephone reception. For example, portable telephones suffer a loss of signal strength when a transmission is being received from the other side of the user's head. Head blockage can cause 6 dB of signal loss. Since the orientation of the antenna is quite important in mobile radiotelephones, many mobile radiotelephones display the received signal strength of the radiotelephone communication signal, which may prompt the user to reorient the antenna. Things. Further, the quality of the received signal in an analog or uncoded digital mobile radio system tends to degrade progressively with increasing antenna misalignment. Thus, the noise level tends to increase gradually, which may prompt the user to reorient the antenna by moving the vehicle or portable radiotelephone to reduce this noise. Here, it is now common to use digital voice coding and / or digital error correction coding in wireless communication systems to improve communication efficiency. This digital coding allows good quality communications to be down to very low signal-to-noise ratios of less than 2 dB with very sharp cutoffs below a threshold of less than 2 dB. Thus, the degradation of the analog FM or uncoded system is lost and replaced by a sharp cutoff below the threshold. In this type of digitally coded wireless communication system, poor orientation may cause the signal strength to drop below a threshold, resulting in a sudden termination of communication. A decrease in signal strength is not accompanied by an increase in noise level, which may encourage reorientation of the antenna. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a system and method for orienting a mobile radiotelephone antenna with respect to received mobile radiotelephone information. It is another object of the present invention to provide a method and system for orienting an antenna in a digital mobile radiotelephone that uses a coding technique to generate a threshold below which the signal is cut off. These and other objects are provided in accordance with the present invention by a mobile radiotelephone that injects an audible alignment signal into the audible radiotelephone information that is a function of the orientation of the radiotelephone antenna. The audible alignment signal prompts the wireless telephone user to reorient the wireless telephone antenna to improve alignment with respect to the source of wireless telephone information. In particular, the received radiotelephone information has a received signal strength that is a function of the position of the radiotelephone antenna. According to the invention, an audible alignment signal, which is a function of the received signal strength of the radiotelephone information, is injected into the audible radiotelephone information. The audible alignment signal may be a direct function of the received signal strength, or may be a function of another parameter that depends indirectly on the signal strength, for example, distortion or noise levels. The audible alignment signal is preferably artificial noise that is injected into the loudspeaker of the radiotelephone along with the radiotelephone information signal to restore the subjective radio quality information to the received radiotelephone information. By artificially restoring the subjective high quality degradation state, the present invention prompts the user to reorient the radiotelephone antenna that receives the radiotelephone information. A mobile radiotelephone according to the present invention comprises means for receiving radiotelephone information in addition to an antenna and a radio transceiver. The signal strength indicating means is responsive to the receiving means for generating a signal strength indication that is a function of the signal strength of the received wireless telephone information. As mentioned above, the signal strength indication may be a direct or indirect function of the signal strength. The sonic conversion means, which generally comprises one or more loudspeakers or earspeakers, and which may comprise a voice codec and other circuitry, responds to the receiving means and the signal strength indicating means so that an audible signal strength indication is audible. An audible signal is generated that combines the received wireless telephone information and the signal strength indication as provided with the wireless telephone information. According to the invention, said receiving means is a sharp cut-off receiving means, said means for generating an audible radiotelephone communication signal when the received signal strength of the radiotelephone communication signal exceeds a threshold value; It is especially useful in digitally coded mobile radiotelephones or other mobile radiotelephone systems that suppress or cut off the audible radiotelephone communication signal when the intensity falls below a threshold. In this type of wireless telephone, the signal strength indicating means generates an alarm signal that is a function of the received strength of the wireless telephone communication signal to indicate that the received signal strength is approaching a threshold. The signal strength indicating means generates artificial noise that increases as a function of the decrease in the received signal strength of the radiotelephone communication signal, and indicates that the received signal strength is decreasing, that is, approaching the threshold value. It is preferred to have the means shown. Preferably, the artificial noise increases as a function of a decrease from the received signal strength above the threshold to the received signal strength below the threshold, such that the received signal strength approaches the threshold. Indicates that the lever has passed the threshold. However, audible indications that increase in strength with increasing signal strength can also be used. Thus, even after the radiotelephone communication signal has been suppressed, the artificial noise level can still encourage the user to reorient the antenna to restore the communication information. Artificial noise can be any signal that differs from the received wireless telephone information and changes as a function of the orientation of the antenna. For example, the artificial noise may be broadband white or pink noise, a single sinusoidal frequency or multiple sinusoidal frequencies whose amplitude or frequency changes as the signal strength decreases. Alternatively, the artificial noise may be a periodic signal, such as a click or a chirp, whose repetition periodicity changes as a function of the change in the received signal strength of the radiotelephone communication signal, so that the This indicates that the received signal strength has decreased, that is, is approaching the threshold. This changing periodic signal may be a sound such as a radio tuning instruction. Artificial noise may also be a synthesized voice message, such as the audible word "move", wherein the message increases in amplitude or frequency as the received signal strength decreases. The invention is also particularly useful in mobile radiotelephone systems that use automatic power control at the transmitter (terrestrial base station or satellite). These transmission power control systems allow the transmitter to increase its power in response to instructions from the mobile radiotelephone where the mobile radiotelephone is receiving low signal strength. This automatic power control system provides a sharper threshold. This is because the automatic power control system prevents signal degradation against a slow decrease in received signal strength that can be tracked until the system can no longer supply power. According to the present invention, the transmission power instruction signal is transmitted by the transmitter together with the wireless telephone information. The audible alignment signal is also responsive to a transmit power indication signal received by the wireless telephone to generate a signal strength indication that is a function of the signal strength of the received wireless telephone information and the transmit power of the received wireless information. Thus, for example, as the transmit power is increased, the amount of artificial noise injected is also increased to encourage reorientation of the antenna so that reduced transmit power levels can be used. Become. The present invention encourages the user to reorient the radiotelephone antenna by injecting an audible artificial noise signal into the audible radiotelephone information for better reception. The user may be prompted to reorient the antenna before the audibly degraded information arrives. This results in improved mobile radiotelephone information. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a mobile radiotelephone that can use the present invention. FIG. 2 is a block diagram of a digital signal processor (DSP) for generating an alignment signal according to the present invention. FIG. 3 illustrates the operation of generating a first alignment signal according to the present invention. FIG. 4 illustrates the operation of generating a second alignment signal according to the present invention. FIG. 5 is a block diagram of the received signal processing according to the second embodiment of the present invention. FIG. 6 is a block diagram of a demodulator according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, the present invention will be more fully described with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, this disclosure is complete and complete, and These examples are provided so as to fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout. Referring now to FIG. 1, there is shown a functional block diagram of a mobile radiotelephone that can use the present invention. The mobile radiotelephone 100 may be a vehicle mobile radiotelephone, but is preferably a portable mobile radiotelephone. The mobile radiotelephone 100 typically receives radiotelephone information 150 from a terrestrial base station 155 or an orbiting satellite (not shown). FIG. 1 is a simplified representation of a dual mode cellular radiotelephone. This dual-mode cellular radiotelephone is disclosed by co-inventors Paul W. Dent and Buji, the disclosures of which are incorporated herein by reference. (Multi-Mode Signal Processing) and is described in more detail in U.S. patent application Ser. No. 07 / 967,027, assigned to the assignee's parent company. Briefly, the antenna 145, the wireless transceiver 140, and the receiving digital signal processor (DSP) 125 function as a means for receiving wireless telephone information 150. The receiving DSP 125 processes signals received from the wireless transceiver 140 via the DSP interface 135 and generates a digital audio signal that can be applied to the audio codec 115 for transmission through a sound transducer such as, for example, the loudspeaker 110. I do. The transmitting DSP 120 receives the digitized audio signal from the microphone 105 via the audio codec 115 and provides this signal to the DSP interface 135 for transmission by the wireless transceiver 140 and the antenna 145. Microcontroller 130 controls some or all components of mobile radiotelephone 100. The design of mobile radiotelephone 100 is well known to those skilled in the art and need not be described further herein. The present invention is preferably implemented in part as a stored program running on a receiving DSP 125, which may be, for example, a Texas Instruments C53 digital signal processor. However, the invention may also be partially implemented as a stored program running on microcontroller 130 or another processor. Alternatively, a custom logic design or a combination of software and hardware can be used. Referring now to FIG. 2, a block diagram of the receiving DSP 125 of FIG. 1 constructed in accordance with the present invention will be described. As shown in FIG. 2, the reception DSP 125 includes a communication signal generation unit 210 that generates a digital received wireless communication (voice) signal from wireless telephone information received from the DSP interface 135. The communication signal 250 is applied to the voice codec 115 and converted to an analog signal, which is supplied to the loudspeaker 110 to generate audible radiotelephone information. The communication signal processing means 210 may include digital audio decoding and error correction functions to generate the abrupt cutoff receiver using techniques well known to those skilled in the art. In such a coded digital system, an audible radiotelephone communication signal is generated when the received signal strength of the radiotelephone information exceeds a first threshold, and the received signal strength is raised to a second threshold. When it falls below audible radiotelephone communication signals are suppressed. Referring to FIG. 2, the receiving DSP 125 also includes an alignment signal generating means 220. The alignment signal generating means 220 can receive an instruction regarding the received signal-to-noise ratio from the DSP interface 135. As will be appreciated by those skilled in the art, wireless transceiver 140 may generate a received signal strength indication signal. Alternatively, receiving DSP 125 or microcontroller 130 may generate a received signal strength indication signal from the received wireless information. The generation of the received signal strength signal is well known to those skilled in the art and need not be further described. Alignment signal generator 220 generates an alignment or alarm signal 240 that is a function of the received signal strength of the wireless telephone communication signal. Alignment signal 240 is injected into the audible wireless communication signal by combining digital received wireless communication signal 250 and alignment signal 240 in summer 230. Summer 230 generates a synthesized signal 260 that is provided to audio codec 115 and converted to an analog signal and broadcast by loudspeaker 110. It will be appreciated that the wireless communication signal 250 and the alignment signal need not be combined, but rather can be individually provided to one or more loudspeakers or earpieces 110 as long as the audible alignment signal is injected into the audible wireless telephone information. Like. In the embodiment of FIG. 2, the alignment signal generating means 220 and the summer 260 form an injection means for injecting an audible alignment signal into the audible radiotelephone information, which is a function of the orientation of the radiotelephone antenna. Audible conversion means, such as loudspeaker 110 and voice codec 115, generate an audible signal in response to receiving digital processor 125, which combines the received radiotelephone communication signal 250 and the alignment signal, resulting in an audible signal. A signal strength indication is entered into the audible radiotelephone information. Here, the operation of generating the first embodiment of the alignment signal (block 220 in FIG. 2) will be described with reference to FIG. In particular, at block 310, an increasing signal is generated as a function of decreasing received signal strength. At block 320, an artificial noise signal is generated and scaled or amplified by the signal generated at block 310. Accordingly, an artificial noise is generated whose amplitude decreases and increases as a function of the received signal strength, thus providing an artificial indication of a gradual decrease in signal strength. At block 330, the amplified artificial noise is injected into the audible radiotelephone information. The artificial noise signal can be white noise, pink noise or any other type of broadband noise, or a single or multiple sine wave, such as sinusoidal noise or multisine wave, whose amplitude increases or decreases with decreasing received signal strength. It will be appreciated by those skilled in the art that it may be multi-frequency noise. Preferably, audible instructions that increase with signal strength are selected to have "pleasing" characteristics, such as the main chord of music, while audible instructions that increase with deteriorating signals include audible instructions, such as white noise or dissonance. A "non-pleasing" property will be given. In digital systems that result in an abrupt threshold below which communication stops, the artificial noise signal becomes audible above the threshold and increases in intensity as the received signal strength drops through and below the threshold. It is preferable to be stronger, so that the user is prompted to restore communication and reorient the wireless telephone antenna. Here, a second embodiment 220 'of the alignment signal generating means 220 of FIG. 2 will be described with reference to FIG. At block 410, an increasing first signal is generated as a function of decreasing received signal strength, as described in connection with block 310. At block 420, an increasing second signal is generated as a function of the increasing transmit power. In a mobile radiotelephone system that uses automatic transmit power control, the base station 155 (FIG. 1) or the satellite may reduce its transmit power in response to an indication that the mobile radiotelephone 100 is receiving the desired signal strength or less. And increases its transmission power in response to an indication that the mobile radiotelephone 100 is receiving a signal strength greater than desired. According to the present invention, an indication as to base station or satellite transmit power is provided in a downlink transmission of radiotelephone information 150 received by a mobile telephone. Thus, at block 220, an increasing second signal is provided as a function of increasing transmission power from the network. Thus, the audible indication is controlled by feedback from the network to prompt the user to reorient the antenna to improve either the uplink or the downlink. Continuing with FIG. 4, at block 430, the first and second signals are combined to produce a third signal that varies as a function of the first and second signals. For example, this third signal increases as a function of decreasing received signal strength, but will also increase as a function of increasing transmission power. Thus, as the transmission power increases, the alignment signal increases and prompts the user to reorient the antenna so that the transmitter can provide lower transmission power. At block 440, an alignment signal is generated. At block 440, the artificial noise signal is a periodic signal, such as a sine wave or a click, whose frequency changes based on the value of the third signal. Thus, this variable frequency artificial noise signal provides a tuning indication, for example, where higher frequencies indicate lower signal strength and higher transmit power. At block 450, artificial noise is injected into the wireless telephone information. Thus, the present invention generates an audible alignment signal that is a function of the orientation of the radiotelephone antenna (and, possibly, the base station or satellite transmit power) that indicates the alignment or misalignment of the radiotelephone antenna for reception of the radiotelephone information. . At this time, the user is prompted to reorient the antenna, and as a result, the alignment signal decreases. The present invention can be used in analog systems to provide a high quality degradation indicator before the actual system noise begins to penetrate, and to indicate that the cutoff threshold is approaching or has passed. Provide a high quality degradation indication that can be used in digital systems that use coding. The user is prompted to reorient the antenna and restore a high quality signal. Referring now to FIG. 5, there is illustrated a second embodiment of the present invention. FIG. 5 illustrates the different partitioning of the block diagram of the received signal processing at either the radiotelephone or the transmitter (terrestrial base station or satellite). FIG. 5 is a functional partitioning corresponding to FIG. 1 which is a hardware partitioning. The signal plus noise and interference are received at antenna 145 and down-converted and digitized by wireless transceiver 140 to obtain a signal representation suitable for digital signal processing. The receiving DSP 125 processes the converted received signal and performs a demodulation and error correction decoding function 500 to obtain a digital signal representing coded speech. The coded voice is further decoded by the DSP 125 and converted to analog voice by the CODEC 115. Each of these functions is shown as block 510 in FIG. Block 500 also decodes the command messages and passes them to control processor 130. Block 500 also generates a signal quality indication that represents the probability that the decoded bits passed through speech decoding 510 are error free. Speech decoder 510 ignores bits that are designated as unreliable by a process known as "speech parameter interpolation" and outputs a default speech sound or otherwise outputs an error. The ability to hide the effects of bits can be provided. Error concealment may include outputting “comfort noise” during the period of the unreliable signal. This comfort noise avoids suddenly cutting off any audible output that gives the undesirable impression of "chopped" sound. According to embodiments of the present invention, the demodulation and decoding function 500 may additionally output a signal representing the radio noise removed in the decoding process, as described herein. Demodulation and error correction decoding are described in "Channel-Independent Equalizer Device (Channel-E) by Co-Inventor Dent, filed September 14, 1994, the disclosure of which is incorporated herein by reference. It can be beneficially performed by a maximum likelihood sequence estimator according to US patent application Ser. No. 08 / 305,727 entitled "Independent Equalizer Device". Referring to FIG. 6, the Viterbi sequential maximum likelihood sequence estimator includes a state memory 65 that stores a number of hypotheses about the received symbol sequence, along with a path distance representing the cumulative probability. . Processing comprises using a transmitter model 60, which may include a model of the propagation channel learned from processing a known sequence of bits, called a training sequence or a synchronization word. The latter information is implemented in the reference vector array of the state memory 65. The transmitter model 60 sequentially calculates the expected signal value corresponding to the new bit hypothesis for each state, with the assumption that the previous hypothesis is true. The expected signal value is compared with the received signal value of the comparator 61 to obtain a difference. This difference is a measure of the error between the hypothesis and the actual received signal sample, which error is only due to radio noise if the hypothesis is correct. A mismatch indication is added to the previous path distance corresponding to the tested hypothesis to obtain a new cumulative mismatch or path distance. Adder 62 forms a new path distance from the state with the leftmost bit in the current hypothesis memory equal to binary '0', while adder 64 generates a new path distance with the leftmost bit position being binary '1'. A new path is formed for the corresponding current hypothesis that only being is different. Comparator 63 compares the two new path distances and selects the lower path distance so that all corresponding states in the associated state memory become the new contents of the state memory, with the current hypothesis The leftmost bit (which will be 0 or 1 depending on which state gave the lower path distance) is left shifted into the already processed portion of memory. After testing all previous hypotheses, both '0' and '1' as hypotheses for the new bit and processing all these hypotheses, the number of states remaining remains the same as before, but all The path distance is updated to the lower of the two compared distances, and decoding will be increased by one symbol. The operation of FIG. 6 is described in more detail in the incorporated patent application. A description is given of how it can be modified to provide a tuning noise indication according to embodiments of the present invention. As described above, the comparator 61 calculates the difference between the hypothesized signal value and the actually received signal value only due to radio noise when the hypothesized signal value is true. . Instead of discarding this calculated difference, embodiments of the present invention record the difference with each data symbol in the already processed portion of the state memory. When the error correction coding produces several transmitted samples per first data bit to be transmitted, the transmitter model 60 similarly produces several signal samples for comparison, and the comparator 61 Test some samples and get some differences. These differences are usually combined as a sum of squares to get a mismatch indication before discarding. According to an embodiment of the present invention, the differences are stored in state memory 65 against each processed bit decision. The stored differences from one state are allowed to overwrite the stored differences in another state when one of the two compared hypotheses is selected and survived by the Viterbi process. . The final bit decision made by the Viterbi MLSE Processor is to minimize the sum of the squared differences. Thus, the missing error is likely to be due only to radio noise and not to a false error. Therefore, the stored difference is equal to the received radio noise and can be output to the audio decoder 510. The audio decoder 510 can add radio noise samples to the audio signal so that the user varies in proportion to the signal-to-noise ratio and is "chopped" by the abrupt threshold of the decoding process. You will hear an accurate representation of wireless noise characteristics without any. Digital wireless telephones that use digitization of audio signals often incorporate error detection codes, as well as error correction coding. For example, Cyclic Redundancy Check (CRC) codes are often added to the most perceptually significant bits in digital voice transmission. When the CRC check fails, the erroneous bits are prevented from causing unwanted unwanted acoustic artifacts by various error concealment strategies, also known as "deburping". This type of deburping can preserve useful speech quality when the CRC fails as much as 5% of the time. The detection of a CRC failure for more than 5% of the time can be used as a trigger to automatically add an audible signal quality indication to the telephone output to cause the user to take corrective action. The embodiment described above shows that the noise representation arbitrarily close to the true radio noise can in principle be extracted from the demodulation and decoding process, as well as artificially reintroduced into the audio signal and the threshold of the demodulator Demonstrates that a true indication of improved or degraded signal quality can be provided, independent of characteristics. It is desirable to provide an audible indication of signal quality that increases or decreases as emphasized with respect to the true signal-to-noise ratio. For example, it is desired that a 1 dB reduction in signal-to-noise ratio should be shown to the user as a 3 dB or 6 dB improvement in the artificially added audible indication. This can be achieved by using a stored path distance from the decoding process in addition to or instead of the stored wireless noise waveform. The path distance is proportional to the mean square of the radio noise and may be used to scale the audible indication according to the square of the radio noise, or indeed any power of the radio noise level. The audible indication scaled in this way can be a pre-stored speech waveform if it is desired to reduce the complexity of the demodulation and decoding process. As mentioned above, this type of waveform may be selected to be a "displeasing" sound when exhibiting degraded signal quality. Conversely, a "pleasing" waveform, such as the main chord of music, can be used when scaled oppositely, i.e., by dividing by a power of the path distance, so that its intensity is improved. It increases with the signal quality. A combination of unpleasant sounds that increase with the noise level and pleasant sounds that increase with the signal level may also be used, but at least when the user selects to enable the `` audible tuning indication ''. A "pleasing" sound should be audible, so that the user can prevent this sound from causing madness during speech conversion using another good signal-to-noise ratio. it can. Alternatively or additionally, the network may send a command message as described above to the controller 130 to remotely turn on or off audible instructions to reposition the antenna. Such a command may be based on the signal strength measured by the mobile phone and sent to the network as a signal strength report, or based on the signal strength measured by a network receiver receiving the mobile phone transmission, or both. Out of the network based on the combination of It is also desirable to indicate to a user who is not currently participating in a conversation that the signal quality is audible when the user's telephone periodically receives signal bursts on the speech channel. To conserve battery power, the mobile phone does not continuously receive in standby mode, but only wakes up in so-called sleep mode slots pre-allocated to each mobile unit by the network. This occurs, for example, only at one second intervals. The network knows when the mobile receiver will wake up and call alerts for this receiver will be sent only at those times. Sampling the received signal only at one second intervals is a bit too slow to move the antenna position and provide a waiting signal quality indication to the user that the user can optimize. If necessary, the user can press a button to temporarily operate the receiver for the purpose of aligning the antenna when the phone is in standby mode, or at least fully. By allowing the signal strength to be measured frequently, an audible indication may be required to be enabled. When not in conversation, there is no penalty in providing audible indications of "pleasing" diversity, such as musical noise, which improves signal quality and increases in intensity. Each instruction in the device user manual can be abbreviated as "align for maximum hum", which is an easy instruction for the user to follow. Different "hums" can be created by the uniqueness of the network station that the phone is locked to, for example, when the phone is locked to a terrestrial cellular system, it can generate "space hum"". In the drawings and the specification, the exemplary embodiments of the present invention have been disclosed. In addition, although specific terms are used, they are not used for limitation but only in a general and explanatory sense, and the scope of the present invention is described in the following claims. It is.

[Procedure of Amendment] Article 184-8, Paragraph 1 of the Patent Act [Submission Date] January 26, 1998 (1998.1.26) [Correction contents] Different standards are being published for digital cellular telephone systems in Europe . European digital cellular system, also known as GSM (GSM) Also, use a TDMA architecture.   As is well known to those skilled in the art, a mobile radiotelephone is And a transceiver for receiving wireless telephone information via a telephone antenna. car In both mobile radio telephones, the antenna is generally mounted on the vehicle body. Portable movement In wireless telephones, the antenna generally protrudes from the portable wireless telephone housing. I have. The correct orientation of the antenna for radiotelephone communication signals is It is important for clear reception without out. As is well known, the direction of the antenna Often, there is a clear improvement in the reception of wireless telephones. For example, a portable telephone may have a transmission received from the other side of the user's head. You experience a loss of signal strength. Head blockage causes 6 dB signal loss Can be rubbed.   Antenna orientation is quite important in mobile radiotelephones, so many mobile The line telephone displays the received signal strength of the wireless telephone communication signal, which is The user can be prompted to re-orient the antenna. In addition, analog or Is the quality of the received signal in an uncoded digital mobile radio system. Tend to gradually deteriorate with increasing misalignment. Thus, the noise The levels tend to increase over time, which encourages the user to reduce this noise. Moving the vehicle or portable radiotelephone to reduce Can be reoriented.   The audible alignment signal, which is a function of the orientation of the radiotelephone antenna, is By injecting into the talk information, prompting the wireless telephone user to Realignment to improve alignment with the received radiotelephone information. It is known to do so. For example, European Patent Application Publication No. 531,918. No., EP-A-464,911 and International Publication No. 95-2. See document 1,494. The receiving DSP 125 processes the converted received signal to perform demodulation and error correction decoding. Perform the loading function 500 to obtain a digital signal representing the coded speech . The coded audio is further restored by the DSP 125 and Is converted to analog voice. Each of these functions is represented by block 5 in FIG. Shown as 10. Block 500 also decodes the command message, Pass them through the control processor 130. Block 500 also includes audio decoding A signal representing the probability that the decoded bits passed through 510 are error free. Generate quality instructions.   Speech decoder 510 uses “speech parameter interpolation”. interpolation) is indicated as unreliable by a process known as Ignore the bit and output the default audio sound, or else the erroneous bit Ability to hide the effects of Error concealment is an unreliable signal Outputting "comfort noise" during the period of. this Pleasant noise is all about giving the undesired impression of "chopped" sound. Avoid sudden cutoff of all audible outputs. According to an embodiment of the present invention, The demodulation and decoding function 500 includes a decoding and decoding function as described herein. .Additional output of a signal representing wireless noise removed by the process You.   Demodulation and error correction decoding are incorporated herein by reference. Dent, co-inventor, issued September 17, 1996 "Channel-Independent Equalizer Device" Likelihood sequence estimator according to US Pat. No. 5,557,645 entitled Can be beneficially performed by the maximum likelihood sequence estimator. You. Referring to FIG. 6, the Viterbi sequential maximum likelihood sequence estimator (Viterbi sequential maximum likelihood sequence estimator) is the cumulative probability Store a number of hypotheses about the received symbol sequence, along with a path distance representing A state memory 65 is provided.                                The scope of the claims   1. a mobile radio telephone antenna (145);   Means for receiving radiotelephone communication (140) via said mobile radiotelephone antenna Wherein the received radiotelephone communication is a function of the position of the radiotelephone antenna. Said means having signal strength,   In response to the receiving means, the received wireless telephone communication is converted into audible wireless telephone communication. Means (115) for changing   In response to the receiving means, a function of the received signal strength of the received wireless telephone communication By injecting an audible alignment signal into the audible radiotelephone communication, Prompts the line telephone user to re-orient the wireless telephone antenna, and Means (130) for improving alignment with respect to established radiotelephone communications; ,   The receiving means sets a threshold value of the received signal strength of the received wireless telephone communication to a threshold value. When it falls below, the sudden cutoff receiving means for suppressing the received wireless telephone communication is provided. Including   Audible wherein the injection means is a function of the received signal strength of the wireless telephone communication signal. Injecting an alignment signal to reduce the received signal strength to the threshold A mobile radiotelephone comprising means adapted to indicate that   2. In the mobile radio telephone according to claim 1, the abrupt cutoff receiving means includes: The mobile radiotelephone comprising digitally coded radiotelephone receiving means.   3. The mobile radiotelephone according to claim 1, wherein said injecting means comprises said radiotelephone telephone. Injecting artificial noise into the audible radiotelephone communication that varies as a function of antenna orientation. The mobile radio telephone.   4. The mobile radiotelephone of claim 1, wherein said injecting means comprises said radiotelephone communication. Audible artificial noise whose amplitude increases in response to a decreasing received signal strength of the received signal. The mobile radiotelephone comprising means for injecting into radiotelephone communication.   5. The mobile radiotelephone of claim 1, wherein said injecting means comprises said radiotelephone communication. Periodic artificial noise whose periodicity changes in response to the decreasing received signal strength of the received signal Said mobile radiotelephone comprising means for injecting into said audible radiotelephone communication. .   6. The mobile radiotelephone according to claim 1, wherein said injecting means is connected to said receiving means. Therefore, further responding to the received transmission power indication signal, Injecting an alignment signal that is a function of the transmitted power of the received radiotelephone communication. The mobile radio telephone.   7. In the mobile radio telephone according to claim 1.   The converting means comprises means for removing noise from the received wireless telephone communication; Estimating means for generating an estimated amount of the noise removed from the received wireless telephone communication; Including   The injecting means varies as a function of the estimator in response to the estimating means. Means for generating a voice indication signal, and delivering the voice indication signal to the audible radiotelephone communication. The mobile radiotelephone.   8. The mobile radio telephone according to claim 7, wherein the estimating means includes a path metric. Said mobile radiotelephone comprising an error correction decoder comprising means.   9. The mobile radio telephone according to claim 7, wherein said estimating means includes a Viterbi sequential maximum likelihood. Sequence estimator (Viterbi sequential maximum likelihood sequence an estimator).   Ten. The mobile radio telephone according to claim 7,   The estimating means includes:   Means for calculating an expected wireless telephone communication in response to the receiving means;   Responding to the calculating means, transmitting the expected wireless telephone communication to the The expected wireless telephone communication and the received wireless telephone communication Means for obtaining the difference between   Generating an error signal based on the obtained difference in response to the comparing means; Means, said mobile radiotelephone.   11． 2. The mobile radio telephone according to claim 1, wherein the received radio telephone communication has a period. A cyclic redundancy check, wherein the injection means comprises Audible alignment as a function of the failure of the cyclic redundancy check in a received radiotelephone communication Said mobile radiotelephone including means for injecting a mobile phone signal.   12． 2. The mobile radiotelephone according to claim 1, wherein said injecting means receives said received radio signal. Audible pleasing alignment as a function of increasing received signal strength of line telephone communications Injecting a signal and relating the decreasing received signal strength of the received radiotelephone communication. Said means for injecting an audible objectionable signal which is a number. Line phone.   13. The mobile radio telephone according to claim 1,   The conversion means,   Means for removing noise from the received wireless telephone communication;   In response to the removing means, the removing means Error detecting means for detecting that noise cannot be removed;   In response to the error detection means, the removal in the received wireless telephone communication Error concealment means for concealing the effects of noise;   Wherein the injection means is responsive to the error detection means. The mobile radio telephone.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H04B 1/10 H04B 7/26 C (81) Designated countries EP (AT, BE, CH, DE, DK) , ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE), OA (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE) , SN, TD, TG), AP (GH, KE, LS, MW, SD, SZ, UG), UA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AL, AM , AT, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, CZ, DE, DE, DK, DK, EE, EE, ES, FI FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX , NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN (72) Inventor Lidobeck, Nils, Rutger United States 27511 Lazerglen Drive, Kelly, North Carolina 202

Claims (1)

[Claims]   1. a mobile radiotelephone antenna,   Means for receiving radiotelephone information via the mobile radiotelephone antenna,   In response to the receiving means, the received wireless telephone information is converted into audible wireless telephone information. Means for replacing   In response to the receiving means, an audible alarm is a function of the orientation of the radiotelephone antenna. By injecting an audio signal into the audible wireless telephone information, Prompts the user to re-orient the wireless telephone antenna, Means for providing improved alignment with respect to information. A mobile radio telephone characterized by the following.   2. The mobile radio telephone according to claim 1, wherein the received radio telephone information is The received signal strength being a function of the position of the radiotelephone antenna, An audible alignment that is a function of the received signal strength of the received radiotelephone information. Wherein said mobile radiotelephone comprises means for injecting a wireless signal.   3. In the mobile radio telephone according to claim 2,   The receiving means determines that the received signal strength of the received wireless telephone information is below a threshold value. A sharp cutoff receiving means for suppressing the received wireless telephone information when turning That   The injecting means may be a function of the received signal strength of the wireless telephone information signal. Injecting a listening alignment signal, wherein the received signal strength decreases to the threshold The mobile radio telephone.   4. In the mobile radio telephone according to claim 3, the abrupt cut-off receiving means includes: The mobile radio comprising digital coded radio telephone receiving means. phone.   5. The mobile radiotelephone according to claim 1, wherein said injecting means comprises said radiotelephone telephone. Injecting artificial noise into the audible radiotelephone information that varies as a function of antenna orientation Said mobile radio telephone comprising:   6. The mobile radiotelephone according to claim 2, wherein the injection means has an amplitude of the radio wave. Audible artificial noise that increases with decreasing received signal strength of the telephone communication signal The mobile radio telephone according to claim 1, further comprising means for injecting into the radio telephone information.   7. The mobile radiotelephone according to claim 2, wherein the injection means has a periodicity of the radio frequency. The periodic artificial noise that changes according to the decreasing received signal strength of the line telephone communication signal Means for injecting the audible radiotelephone information into the mobile radiotelephone information. Story.   8. The mobile radio telephone according to claim 1, wherein said injecting means is provided by said receiving means. Further responding to the transmission power indication signal received by the And injecting an alignment signal that is a function of the transmission power of the received radiotelephone information. Said mobile radio telephone.   9. The mobile radio telephone according to claim 1, wherein the converting means includes the received radio signal. Means for removing noise from the telecommunications information and the received wireless telecommunications information Comprising estimating means for generating an estimator of the noise removed from   The injecting means is responsive to the estimating means for sound varying as a function of the estimator. Means for generating a voice indication signal, and injecting the voice indication signal into the audible radiotelephone information. The mobile radio telephone.   Ten. 10. The mobile radio telephone according to claim 9, wherein said estimating means includes a path distance means. The mobile radio telephone according to claim 1, further comprising an error correction decoder.   11． 10. The mobile radio telephone according to claim 9, wherein said estimating means is a Viterbi sequential retrieving unit. Likelihood sequence estimator (Viterbi sequential maximum likelihood The mobile radio telephone according to claim 1, further comprising a sequence estimator.   12． 10. The mobile radio telephone according to claim 9, wherein the estimating means includes:   Means for calculating expected wireless telephone information in response to the receiving means;   Receiving the expected wireless telephone information in response to the calculating means; Comparing the expected wireless telephone information and the received wireless telephone information Means to obtain,   Generating an error signal based on the obtained difference in response to the comparing means; Means, said mobile radio telephone.   13. 2. The mobile radio telephone according to claim 1, wherein the received radio telephone information has a period. A cyclic redundancy check, wherein the injecting means includes Note the audible alignment signal as a function of the failure of the cyclic redundancy check in the line telephone information. The mobile radio telephone, comprising:   14. 2. The mobile radiotelephone according to claim 1, wherein said injecting means includes receiving said received radio signal. Audible pleasing alignment as a function of increasing received signal strength of line telephone information And the received signal strength of the received radiotelephone information is reduced. Said means for injecting an audible objectionable signal which is a function of Mobile radio telephone.   15． 2. The mobile radio telephone according to claim 1, wherein the conversion unit includes:   Means for removing noise from the received wireless telephone information;   In response to the removing means, the removing means obtains the Error detecting means for detecting that noise cannot be removed;   In response to the error detection means, the unremoved in the received wireless telephone information Error concealment means for concealing the effects of noise,   Wherein said injection means responds to said error detection means. phone.   16． In a base station communicating with a mobile radio telephone in a mobile radio communication system,   Power levels that vary as a function of the position of the mobile radiotelephone with respect to the base station A variable power transmitting means for transmitting wireless information to the mobile radio telephone,   An instruction of the transmission power level of the wireless information to the variable power transmission unit. Means for causing the mobile radio telephone to transmit. .   17． 17. The base station according to claim 16, wherein the base station is a terrestrial base station or a satellite base station. The base station, wherein the base station is a ground station.   18． Means for receiving wireless telephone information;   Is a function of the signal strength of the received wireless telephone information in response to the receiving means. Signal strength indicating means for generating a signal strength indication;   An audible signal strength indication is audible in response to the receiving means and the signal strength indication means. The received wireless telephone information and the Sound wave converting means for generating an audible signal combined with the signal strength indication. And a mobile radio telephone.   19. The mobile radio telephone according to claim 18,   The receiving means may determine that the received signal strength of the received wireless telephone information exceeds a threshold. When turning, it generates an audible wireless communication signal and the received signal strength is above the threshold. Abrupt cutoff receiver to suppress the audible radiotelephone communication signal when below Having a step,   The signal strength indicating means is a function of the received signal strength of the wireless telephone communication signal. Generating a signal strength indication that the received signal strength approaches the threshold. The mobile radio telephone.   20. 20. The mobile radio telephone according to claim 19, wherein the abrupt cutoff receiving means is The mobile radio telephone comprising digitally coded radio telephone receiving means. .   twenty one. 20. The mobile radio telephone according to claim 19, wherein said signal strength indicating means comprises an amplitude Increases as a function of the decreasing received signal strength of the radiotelephone communication signal. The received signal strength decreases toward the threshold value. The mobile radio telephone according to claim 1, further comprising:   twenty two. 22. The mobile radio telephone according to claim 21, wherein the signal strength indicating means comprises an amplitude. Received signal strength below the threshold from received signal strength above the threshold Person increasing as a function of decreasing received signal strength of said radiotelephone communication signal to a degree That the received signal strength has decreased beyond the threshold value, The mobile radio telephone according to claim 1, further comprising:   twenty three. 20. The mobile radio telephone according to claim 19, wherein said signal strength indicating means has a period. Is changed as a function of a change in the received signal strength of the wireless telephone communication signal. The received signal strength decreases toward a threshold value. Said mobile radiotelephone comprising means for indicating that the mobile radiotelephone is operating.   twenty four. 24. The mobile radiotelephone according to claim 23, wherein the signal strength indicating means has a period. Received signal strength below the threshold from received signal strength above the threshold As a function of the change in the received signal strength of the radiotelephone communication signal up to the strength. Generating a varying periodic artificial noise such that the received signal strength exceeds the threshold. Said mobile radiotelephone comprising means for indicating that the number has decreased.   twenty five. 20. The mobile radio telephone according to claim 18, wherein said signal strength indicating means comprises: Further responding to the transmission power indication signal received by the receiving means, The signal strength is a function of the signal strength of the line telephone information and the transmission power of the received wireless telephone information. Said mobile radiotelephone generating a signal strength indication.   26. 19. The mobile radio telephone according to claim 18, wherein the signal strength indicating means comprises:   Means for removing noise from the received wireless telecommunications information;   A method for generating an estimated amount of the noise removed from the received wireless telecommunication information. And means for determining   Wherein said signal strength indication is a function of said estimator. Story.   27. 27. The mobile radio telephone according to claim 26, wherein said estimating means includes a path distance means. The mobile radio telephone according to claim 1, further comprising an error correction decoder.   28. 27. The mobile radio telephone according to claim 26, wherein said estimating means is Viterbi sequential. The mobile radio telephone according to claim 1, further comprising a maximum likelihood sequence estimator.   29. 27. The mobile radio telephone according to claim 26, wherein said estimating means includes:   Means for calculating expected wireless telephone information in response to the receiving means;   Receiving the expected wireless telephone information in response to the calculating means; Obtain the difference between the expected wireless telephone information and the received wireless telephone information Means,   Generating an error signal based on the obtained difference in response to the comparing means; Means, said mobile radio telephone.   30. 19. The mobile radio telephone according to claim 18, wherein the received radio telephone information is a The signal strength indicating means includes Means for generating a signal strength indication that is a function of the cyclic redundancy check failure. The mobile radio telephone according to claim 1, wherein   31. 20. The mobile radio telephone according to claim 18, wherein said signal strength indicating means comprises: Audiblely pleasing as a function of increasing received signal strength of received radiotelephone information Generating an alignment signal and reducing the received radiotelephone information. Providing means for producing an audible objectionable signal that is a function of the signal strength. The mobile radiotelephone characterized by the above-mentioned.   32. 19. The mobile radio telephone according to claim 18, wherein the signal strength indicating means comprises:   Means for removing noise from the received wireless telephone information;   In response to the removing means, the removing means obtains the Error detecting means for detecting that noise cannot be removed;   In response to the error detecting means, the unremoved information in the received wireless telephone information is Error hiding means for hiding the influence of noise. Mobile radio telephone.   33. While receiving wireless telephone information via a wireless telephone antenna, Antenna Alignment for Mobile Radio Telephones Converting Line Telephone Information to Audible Communication Signals In the instruction method   The audible alignment signal, which is a function of the orientation of the radiotelephone antenna, is Injecting into the line telephone information prompts the wireless telephone user to Re-orient the tena and align with the received wireless phone information The antenna alignment characterized in that the antenna alignment is improved. Instruction method.   34. The antenna alignment instruction method according to claim 33, wherein the received The radiotelephone information has a received signal strength that is a function of the position of the radiotelephone antenna. Wherein the injecting step comprises:   Audible alignment that is a function of the received signal strength of the received radiotelephone information Injecting an audio signal into the audible radiotelephone information. How to indicate antenna alignment.   35. 35. The antenna alignment instruction method according to claim 34, wherein the injection step is performed. Reduce artificial noise that varies as a function of the orientation of the radiotelephone antenna to the audible Injecting into line telephone information. Instruction method.   36. 35. The antenna alignment instruction method according to claim 34, wherein the injection step is performed. A person whose amplitude increases in response to a decreasing received signal strength of the wireless telephone communication signal. Injecting engineering noise into the audible radiotelephone information. Antenna alignment instruction method.   37. 35. The antenna alignment instruction method according to claim 34, wherein the injection step is performed. Changes the periodicity according to the received signal strength that decreases in the wireless telephone communication signal Injecting periodic artificial noise into the audible radiotelephone information. The antenna alignment instruction method to be performed.   38. 34. The antenna alignment instruction method according to claim 33, wherein the mobile radio The telephone further receives a transmit power indication signal, and said injecting step comprises:   A function of the orientation of the radiotelephone antenna and the transmission power of the received radiotelephone information Injecting an alignment signal into the audible radiotelephone information, The antenna alignment instruction method.   39. An antenna alignment instruction method according to claim 33,   The mobile radiotelephone is configured to remove noise from the received wireless telecommunications information. And generating an estimate of the noise to be removed from the received wireless telecommunications information. The estimation means to   Said injecting step includes the step of generating a voice indication signal that varies as a function of said estimator. And injecting the voice indication signal into the audible wireless telephone information. And the antenna alignment instruction information.   40. The antenna alignment instruction method according to claim 33, wherein the received The radiotelephone information comprises a cyclic redundancy check, wherein the injecting step includes Inject audible alignment signal as a function of cyclic redundancy check failure in phone information Performing the antenna alignment instruction method.   41. 38. The method of claim 37, wherein the step of injecting comprises: Is   An audible heart is a function of the increasing received signal strength of the received radiotelephone information. Injecting a clean alignment signal;   An audible impairment is a function of the decreasing received signal strength of the received radiotelephone information. Injecting a pleasant signal. Instruction method.