TWI226759B - Method of eliminating irritating noise at the end of communication for a walkie talkie - Google Patents

Abstract

A method of eliminating irritating noise at the end of communication for a walkie talkie which has a receiving loop. The method includes providing a first detector; determining whether a radio frequency signal in a predetermined frequency range received by the walkie talkie belongs to a non-standard squelch signal by using the first detector; and if so, stopping the walkie talkie from receiving following radio frequency signals.

Description

: Outline No. 92107818 Date of revision V. Description of the invention (1) Technical field to which the invention belongs The present invention provides a method for avoiding the noise of radio walkie-talkies, especially a method for avoiding the noise of radio walkie-talkies when the call ends. The prior art walkie-talkie uses a continuous tone-coded s Quel ch system (CTCSS) to achieve the function of multi-party call (gr0up co mmu nicati ο n), while the radio walkie-talkie The main advantage is that it can not be point-to-point directly, without any basic facilities, as long as both parties tune to the same frequency, they can transmit or receive information at any time. In the field of wireless communication, the 'delta' continuous audio coding and mute system uses a low-frequency audio signal (CTCSS tone) to distinguish it from a signal transmitted on a communication channel, making the < ^ plural in the communication area. This is a conversation among users. Refer to Figure 1. Figure 1 is a schematic diagram of the frequency range used in the conventional continuous audio coding mute system. As shown in Figure 1, the frequency range between 6 2 · 5 Hz and 250 Hz is used to transmit the above-mentioned low-frequency audio signals, and the frequency range between 300 Hz and 3 · 4KHz is used to The operation principle of transmitting a user's speech signal is briefly described below. For a conventional portable radio, 14 communication channels (PΓ ·) are generally used for signal transmission and reception. The 14 1. The communication channel is a physical channel.

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One q! .. U One q! .. U Correction No. 92107818 V. Description of the Invention (2) cha η ne 1) In addition, each communication channel can be based on audio signals Tf ••… T3 of 38 different frequencies涞 Generate a total of 53 2 (1 4 * 3 8) logical channels (10 gica 1 cha η ne 1). When a speaker sets the physical channel used by the portable radio to be P private and the audio signal used is T!, That is, the caller sets its logical channel to pi (T 〇, when the caller knows: press the call key (push — ^ 〇_ ^ a 1 k, fTT) of the hand k radio intercom, the The caller can output his voice message through the physical channel p to the corresponding fixed communication range of the portable radio. There are three other users in the letter range, and each of them has ^ 3. The switch is ρ1 (Τι). , Ρι (Τ3δ), ρ2 (Τι), for the first ★ y = 0, because its portable radio is connected to the physical channel pi j1 signal transmission and reception, so the first user's hand-held helmet line ", U Receive the voice signal from the speaker '2 ΐ = Yes, judge the speaker The audio signal used is also the first user to set the same logical channel ρ ^ 1, so the portable radio of the first user will connect 1 to the voice signal of the caller. After using the voice signal of a person who is going to use ^ ^ f ^ °, the second radio intercom is connected to the physical channel P into t! Will start to receive the caller's stand >… 'Shener's portable radio walkie-talkie judges the sender $; #: 二 2 #b, but the audio signal used by the northern τ ^ tongue is τ instead of τ w. That is, the speaker and the second eight & a are logical channels for T rain? 丨 (1〇 盥 刀 别 别 别 疋 疋 & at pp 1 τ, so the second user 々Car & The radio does not receive the speech of the speaker m

Page 7 -------------------— ^ V. Description of the Invention (3) Ά 92107818

It is output by a speaker, so the second user cannot listen to the voice signal of the user. For the third user, since 2 = wire radio is connected to the physical channel p 粦, the signal is transmitted and received. Therefore, # The portable radio of the three users and the caller are different communication channels, so the portable radio of the third user cannot be based on the received signal (received signal

strength indicator (RSSI) to start receiving the signal sent by the caller, so the third messenger: the portable radio does not receive the voice signal of the caller, The voice signal of the caller is output via ~ lap-8, so the second and third users cannot hear the voice signal of the caller, that is, the portable radio of the second and third users judges the audio by The signal enables the squelch function. In other words, users with the same logical channel can communicate with each other to achieve the purpose of the group call. Please refer to Figure 2. Figure 2 is a functional block diagram of a conventional radio two-way radio. The radio walkie-talkie 10 includes an antenna 11, a 4 receiver 12, a selector 14, a processor 16, a voice signal processing unit 20, and a speaker 17, And a microphone 18. The radio walkie-talkie 10 can receive and transmit the carrier RF via the antenna n. For receiving the carrier RF, the transceiver 12 amplifies the weak high-frequency carrier signal, and then converts the high-frequency carrier to a low-frequency intermediate-frequency signal. After the IF signal is demodulated, the fundamental frequency is obtained.

: No. 92107818 Rev. V. Description of the invention (4) The audio signal Rx is transmitted to the selector 14 because the selector 14 will determine the transmission path according to the signal input and output states, in other words, when the radio is in the receiving state That is, when the selector 1 4 receives an input signal from the transceiver 12, it will select the output terminal A to output the baseband signal RX. On the other hand, when a radio is in the transmitting state, the selector 14 will select to use Input B performs transmission. The processor 16 determines the frequency of the audio signal according to the baseband signal ^ Generally speaking, the processor 16 includes an analog low-pass filter circuit (L 0w P assfi 11 er) for transitioning the baseband signal Rx The signal between the frequency of 62 · 5Hz and the frequency of 250Hz, and determine the audio signal corresponding to the baseband signal Rx to determine whether to use the same logical channel. 'If the logical channel corresponding to the baseband signal Rx and the radio 2 0 sets the same logical channel, the processor 16 will start the system 17 for subsequent signal output processing, and the voice signal processing unit 2 〇 also includes two analog filter circuits to capture the frequency of 30 0 Hz The signal between the low-pass filter and the high-pass filter at the frequency of 3 · 4 Κ Η z is finally output through the system, 8-17. Conversely, if the logical channel corresponding to the baseband signal RX is different from the logical channel set by the radio intercom 10, the processor 16 will not start the voice signal processing unit 20 and the speaker 17, so the radio intercom 1 0 No signal transmitted via different logical channels will be output. For transmitting carrier RF, when a user presses the call button, the selector 14 will select the input terminal B, and the processor 16 will activate the microphone 18, so the user's voice signal can be input to the voice. The signal processing unit 20, as mentioned above, the voice signal processing unit 20 uses its filter circuit to capture signals between frequency 300 Hz and frequency 3.4 KHz, and then output to the processor 16 and processor 1. 6 will be based on the logic set by the radio 2

Page 9. / · I; * · ·; i > 122 ^ 759 t No. 92107818 Rev. V. Description of Invention (5) Edit channel and add the corresponding audio signal to the output signal of the voice signal processing unit 2 0 The baseband signal Tx is generated, and finally the baseband signal is converted into a high-frequency carrier RF by the transceiver 12 to be converted into a high-frequency carrier RF, and then output 0 through the antenna 11. In theory, when the RSSI signal disappears, The receiving end will be closed. The user at the sending end will release the original and stop sending. At this time, the transceiver 12 is still demodulating and the team 17 will lose the noise. When receiving the office frequency RF signal, it is higher than one message. Pressing the signal first to produce it after receiving it will make the threshold of receivable strength. When the high-frequency indication is lower than the threshold, at this time, at the end of the call, that is, after the call key is issued, the high-frequency RF signal will indicate the state of the period from strong to weak, so it will The noise generated is harsh (irritating ° users feel quite uncomfortable. Therefore, the object of the present invention is to provide a method to avoid the noise generated by a wireless device when ending a call, in order to solve the above problems.) The application of the present invention The scope of the patent provides a method for preventing a wireless device from generating noise at the end of a call. The radio intercom includes a receiving circuit. The method includes providing a detection circuit in the radio intercom. When the radio intercom receives When a radio signal within a predetermined frequency ^ μ is detected, the first detection circuit is used to detect the absence of the "=", "Shenzhen"

; No. 92107818 means amendment 5. Description of the invention (6) Whether the signal belongs to a non-standard mute audio signal; and if the first detection circuit detects that the radio signal belongs to the non-standard mute audio signal, the radio intercom will stop Receive subsequent radio signals. Another patent application scope of the present invention is to provide a method for transmitting a radio signal by a radio intercom. The radio intercom includes a call key. The method includes using the radio intercom to output a standard mute audio signal when the call key is touched; and when When the call button is released after the call button is touched, the radio interphone is used to output a non-standard mute audio signal for a predetermined period of time. Embodiment Wire 30 ^ Figure. Processing Receive a debt When turning on the microphone Frequency Standard Send Please also walkie-talkie 40 The power of the radio 3 6 to the 4 test circuit Start to touch the wind 3 4 on, produce a mute tone and go out. Refer to Figures 3 and 4 for the appearance of 30 and 40. Figure 5 Intercom 30 includes a transmitter 38. And one by one, 46. Examples of incoming call frequency selection key 4 2. One second detection and the intention is for this call without processing circuit, as shown in the figure, and when the signal key 3 2 is received, the voice signal standard mute audio signal is also received. As for the voice message, as shown in Fig. 1, Fig. 5, and Fig. 3, the present invention does not have the present invention. Fig. 4 series of radio radios invented the timing key 32, a microphone 34, and a one-way radio 40, which includes a device 4 3. One spur sigma 8 4 4, a 4 8 and a receiving circuit 45. 5 t 〇, the processor 36 will control according to the user's preset settings, and finally the number is combined with the preset carrier through the transmitter 3 8 to display, due to the general voice signal

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The second level is between 3 0 0 Hz to 3 4 0 0 Hz, and the frequency f of the audio signal is between 62 · 5Hz to 2 50 Hz. Therefore, audio signals of 38 different frequencies will Distributed between 6 2 · 5 Hz ~ 2 50 Hz, if a user sets the logical channel of his radio walkie-talkie 3 to P i (T 3R), that is, the physical channel P 1 = Carrier 'and the 38th The audio signal (with a frequency of 250 Hz) is transmitted along with the utterance. When the user releases the call button 3 2, that is, t = in the picture, the standard audio signal and voice signal will no longer continue to be transmitted with the physical carrier t 2 1 ', but the call button 3 2 will be released. After turning on, none, T1 machine 30 will output a non-standard mute audio signal along with the carrier. 'Speak 3: 3 and 2 2 △! \ I I will be detailed later ·' After that, the radio Talk key 32 until t3, then radio walkie-talkie 30 △ t ΛΤΛ wave, two mute audio signals τ ... between -ΟΗζ. I ,;-· The signals belong to the same frequency domain, in order to avoid misjudgment, ^ 2θ audio quasi-mute audio signal transmission period , Non-standard two-leaf sent when the standard. Ascending + bang-day audio signals will not be received. The receiver 41 of the radio walkie-talkie 40 is used to receive the radio signal from the helmet machine 30. In this embodiment, the receiver and receiver are determined to only receive the entity. Carrier of the channel dagger. The user chooses whether to judge the wireless power selection input by the receiver 41 ==, so that the audio signal τ39 is used. The first detection circuit 46 is used to determine whether the radio signal input by the 41 includes a non-standard mute audio signal ^: 3 9

Page 12 'V " qo C 1. "Ή 12267591 _r f No. 92107818_ year month_3_ amendment_ 5. Description of the invention (8) The second detection circuit 4 8 is used to determine whether the radio signal input by the receiver 41 1 contains a predetermined standard mute audio signal For convenience of explanation, in this embodiment, the predetermined standard mute audio signal T 3 is 250 Hz. The receiving circuit 45 is used to convert a voice signal in a radio signal into a sound wave, and the speaker 4 4 is It is used to output sound waves. Please refer to FIG. 6, which is a flowchart of the operation of the radio walkie-talkie 40 shown in FIG. 4. The operation of the radio walkie-talkie 40 includes the following steps: Step 10 0: Start; Step 102: Receive The receiver 41 receives the radio signal using the physical channel Pi; Step 104: Whether the selection key 42 is selected, if yes, go to Step 106; if not, go to Step 1.08; Step 106: Use the first detection The test circuit 46 determines whether the radio signal contains a non-standard mute audio signal T39. If yes, go to step 1 12; if not, go to step 10 2; step 108: use the second detection circuit 48 to determine the Does the radio signal include Standard mute audio signal T 38, if yes, go to step 1 0, if not, go to step 1 1 2; step 1 10: send the radio signal to the receiving circuit 4 5 and use the receiving circuit 4 5 to The voice signal in the radio signal is converted into a sound wave, and then used. The sound wave is outputted at 8: 4; and Step 1 12: End. The operation of the radio walkie-talkie 40 is described below. When the receiver 41 receives

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% z V. Description of the invention (9) After 2: 1Ϊ 2 channels of p 1 radio signal (step 1 〇2), processing cry 43 will decide Hi T connection according to whether the selection key 42 is selected (step 104): J 4m radio signal contains non-standard mute port

: 39: If "select key 42 is selected, the processor 43 will; J channel 46 and the second debt test circuit 48 to determine the benefit of the receiver 41 input: = 疋: contains non-standard mute audio signal τ3 and standard mute; f For example, suppose that the non-standard mute audio signal T3 has a frequency of 2 65 5 Η ζ (but this frequency does not belong to any defined standard mute audio signal hand frequency). When the selection key 42 is selected, the first debt test circuit 46 will determine whether u = the radio signal received as 41 input contains a 65Hz radio signal (step 10 6), if a frequency of 6 5 （Z is detected (that is to say in Fig. 5 t t + + A i: and I ~ t), it means that the user of radio walkie-talkie 30 has put 1, and two keys 3 2 'At this time, radio walkie-talkie 40 will stop receiving subsequent wireless and roaring numbers. At this time, because radio walkie-talkie 40 no longer receives radio Signal 'sign', so π 8 4 4 will not output the voice signal in the radio signal again. If the 65Hz signal is not detected, it means that the radio walkie talkie $ 0 is still in the standby state (that is, Figure 5 tt ~ to, At this time, the radio intercom 40 will continue to detect radio signals. If the selection key 42 is not selected, the processor 43 will only use the second detection circuit 48 to detect the presence of the standard muted audio signal T3 in the frequency range of 250 Hz (step 108). It indicates that the quasi-mute audio signal T 3 exists (that is, "t G ~ t" and t 2 ~ t 3 in Fig. 5), then the processor 43 will use the receiving circuit 45 to locate the frequency between 300 Hz and 3.4 kHz. The voice signal is converted into a sound wave (step 11). Finally, the receiving circuit 4 5 will convert the voice signal into a sound wave and output it to Lao 8 44 so that the user of the radio intercom 40 can hear the voice of the radio intercom 30.

P. 14 \…., Bu ··· '* · Ϊ226759:

Si ^ J21〇28l8 V. Description of the invention (10) > When the carrier is pressed on the call key 3 2 The radio interphone 3 in the 5th is transmitted by 06 06 q ^ ,,, ο t! '12 13) The signal and 25 〇Hz frequency \ _shoot nozzle \ 3; \ convey the voice of the input microphone 34 (tr 5 < J38 in Fig. 5), and transmit the 65Hz non-standard mute sound when the call key 32 is released ^ f 30 The voice signal of the transmitter 38 will not be transmitted due to the wireless system; T3 # f transmits the non-standard static signal of the input microphone 34 to 65Hz. 40 is received in the receiving circuit 45 to receive the subsequent radio "1: Annoying noise is generated immediately at the end of the conversation: the trencher 40 will not be compared with the conventional technology to send the carrier at the receiver, and the receiving end of the line | Lei Lei oblique = f 蛉, because the sending end has not met When receiving the background jf machine in the air, it still produces harsh noises because it is in the receiving state. The present invention = lte noise) 'This makes a period of time after the speaker key is released ^ The radio walks out when the carrier of the call is released, And then connected to two, two == standard mute audio signal 3 modulation L rain off the speaker. Using this, f = measured non-standard mute The frequency signal of the radio intercom Yutong ^ Surname ^ ^ 'Let users happen to use this. ~ Fruits, La P Ba will produce no noise. The above is just the same as the platinum patent scope of the present invention. Variation = implementation examples, where the scope of application according to the present invention is covered. At the end of the chapter, the decoration is the patent of the present invention.

I22I75B: No. 92107818 Month or Date Modification Figure ΐ Brief Description Schematic Description Schematic Figure 1 is a schematic diagram of the frequency range used in the conventional continuous audio coding mute system. Figure 2 is a functional block diagram of a conventional radio. FIG. 3 is a schematic diagram of the appearance of a radio intercom according to the present invention. FIG. 4 is a functional diagram of a radio intercom according to the present invention. FIG. 5 is a timing diagram of transmitting signals according to the present invention. Figure 6 is a flowchart of the operation of the radio intercom shown in Figure 4. See Symbol Description

10 ^ 30, 40 radio intercom 11 antenna 12 transceiver 14 selector 16 > 36 processor 17 > 44 Rakou 8 18, 34 microphone 20 voice signal processing unit 32 call button 38 radio transmitter 41 radio receiver 42 selection button 43 Processor 45 Receiver circuit 46 First detection circuit 48 Second detection circuit 第 16 页

Claims (1)

m§is9i-Jj: l No. 92107818_ 年月 日 __ 六 T 申. 胥 涵 ^ 1. A method for preventing a radio intercom from generating noise at the end of a call, the radio intercom includes a receiving circuit, the method Including: providing a detection circuit in the radio intercom; when the radio interphone receives a radio signal in a predetermined frequency range, using the first detection circuit to detect whether the radio signal belongs to a non-standard mute audio Signal; and if the first detection circuit detects that the radio signal belongs to the non-standard mute audio signal, the radio intercom will stop receiving subsequent radio signals after transmitting the radio signal to the receiving circuit. 2. The method according to item 1 of the scope of patent application, wherein the radio includes a second detection circuit, and the method further includes: if the first detection circuit detects that the radio signal does not belong to the non-standard mute audio Signal, use the second detection circuit to detect whether the radio signal belongs to a predetermined standard mute audio signal; if the second detection circuit detects that the radio signal belongs to the predetermined standard mute audio signal, it will The radio signal is transmitted to the receiver 3. The method as described in item 1 of the scope of patent application, further comprising providing a selection key; and adjusting the selection key so that the radio intercom receives the radio signal within the predetermined frequency range. The radio signal can be transmitted to the first detection circuit for detection. Fe Mian Chong No. 92107818 said that the scope of the patent application is the non-standard silence (but does not include the standard 4. The frequency of the audio signal is 6 2 5 Η z ~ 2 5 0 Η The defined frequency of the mute audio signal. 5. A method for transmitting a radio signal by a radio intercom, the radio intercom includes a call key, the method includes: when the call key is touched, using the radio intercom to output a standard mute audio signal And when the call key is released after the call key is touched, the radio is used to output a non-standard mute audio signal for a predetermined period of time. 6. The method described in item 5 of the scope of patent application, wherein the non-standard mute audio signal The frequency ranges from 6 2 .5 Η z to 2 5 0 Η z, but does not include the frequencies defined for standard mute audio signals. Page 18