JP3921444B2 - transceiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless device.
[0002]
[Prior art]
[Patent Document 1]
Japanese Patent Laid-Open No. 8-204606
A radio with VOX (voice operated transmitting) is in a transmission state when the input level (volume) from the microphone exceeds the reference level, and transmits for a certain period of time when the input level falls below the reference level. If the input level does not exceed the reference level within a certain time, the transmission is terminated.
[0004]
FIG. 4 is a time chart showing the VOX transmission operation as described above. Since the input level exceeds the reference level at the point a, the radio enters the transmission state, and after the input level falls below the reference level at the point b, a certain time is elapsed. t, the transmission state is held, and in this example, the input level does not exceed the reference level during this fixed time, so that the radio ends transmission at point c after the fixed time t has elapsed.
[0005]
[Problems to be solved by the invention]
However, in the VOX transmission operation as described above, even if there is a sufficient input level from the microphone at the start of transmission, the amount of air in the lungs decreases as the length of one talk increases, making it conscious. Otherwise, the volume of the talk was lowered, the input level fell below the reference level while talking, and the transmission ended in the middle of the talk. In addition, if the user is talking about the reference level so that this is not the case, the timing of breathing becomes unnatural, which may cause discomfort to the receiver and the sender.
[0006]
Therefore, in Patent Document 1, in addition to the above operation, an attenuator is inserted in the microphone input unit to increase the amount of attenuation before the start of transmission, and after the start of transmission, the amount of attenuation is decreased to enable transmission of a small voice. .
[0007]
However, Patent Document 1 has a problem in that an attenuator and a control unit are required in addition to a normal circuit.
[0008]
The present invention has been made in view of the above points, and it is possible to prevent a transmission end state in the middle of talking without requiring an additional circuit, and it is not necessary to be aware of breathing. The purpose is to provide.
[0009]
[Means for Solving the Problems]
The radio of the present invention starts transmission when the input level from the microphone exceeds the reference level, holds transmission for a certain time when the input level falls below the reference level, and the input level becomes the reference during the certain time. In a radio device for VOX transmission operation in which transmission is terminated if the level is not exceeded, the reference level includes a transmission start reference level and a transmission end reference level, and the transmission end reference level is a predetermined time after the start of transmission. The level is lowered.
[0010]
Furthermore, as a preferred form, after the transmission end reference level is lowered, if the input level from the microphone again exceeds the transmission start reference level, the transmission end reference level is reduced The original high level is restored, and the level is lowered again after the predetermined time. Further, a means for detecting a decrease in the microphone input level due to the user's voice to detect the breathing cycle of the user, and the level of the reference level for ending transmission is set according to the breathing cycle detected by the means. And a means for adjusting the predetermined time until it is lowered.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a radio according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a block diagram showing an embodiment of the wireless device of the present invention. The radio of this embodiment includes a microphone 11, a transmission circuit 12, an antenna 13, an input level detection means 21, a transmission start reference level comparison means 22, and a transmission end reference level provided in the microprocessor 20. A comparison means 23, a transmission end reference level changing means 24, a transmission holding means 25, a transmission time measuring means 26, a transmission circuit control means 27, and a transmission start and end reference level storage means 31 provided in the EEPROM 30 are provided. .
[0012]
The microphone 11 inputs a user's voice. The transmission circuit 12 generates a transmission signal modulated by the audio signal from the microphone 11 and radiates it from the antenna 13 as a radio wave. The input level detection means 21 detects the input level from the microphone 11. The transmission start reference level comparison unit 22 compares the input level detected by the input level detection unit 21 with the transmission start reference level. The transmission end reference level comparison means 23 compares the input level detected by the input level detection means 21 with the transmission end reference level. The transmission holding means 25 receives the output from the transmission end reference level comparison means 23 and holds the transmission for a certain period of time. The transmission circuit control unit 27 receives the outputs from the transmission start reference level comparison unit 22 and the transmission holding unit 25 and controls the transmission circuit 12. The transmission time measuring means 26 receives the outputs from the transmission start reference level comparing means 22 and the transmission circuit control means 27 and measures the transmission time. The transmission end reference level changing unit 24 receives the outputs from the transmission start reference level comparing unit 22 and the transmission time measuring unit 26, and changes the level of the transmission end reference level in the transmission end reference level comparing unit 23. To do. The transmission start and end reference level storage unit 31 stores the transmission start reference level and the transmission end reference level, and stores these reference levels in the transmission start reference level comparison unit 22 and the transmission end reference level comparison unit 23. Forward.
[0013]
The wireless device configured as described above has two types of reference levels for transmission start and transmission end as shown in FIG. 1 as reference levels for the VOX transmission operation. The transmission start reference level is set higher than the transmission end reference level. At the start of transmission, the input level from the microphone is compared with the reference level for starting transmission, and if the input level from the microphone exceeds the reference level for starting transmission (FIG. 1, T1), the transmission state is entered. When transmission starts in this way, the input level from the microphone is compared with the reference level for ending transmission. If the input level from the microphone falls below the reference level for ending transmission (FIG. 1, T3, T6), the transmission is held for a certain transmission holding time t2, and the input level starts transmission within the transmission holding time t2. If the reference level for use is not exceeded, the transmission is terminated (FIG. 1, T7).
[0014]
Although the transmission end reference level is set lower than the transmission start reference level, there are two types of high level H and low level L. The fixed time t1 after the start of transmission is set to the high level H, but when the fixed time t1 elapses (FIG. 1, T2), it is changed to the low level L (the level is lowered). When the input level from the microphone exceeds the transmission start reference level after changing to the low level L (FIG. 1, T4), the transmission end reference level is returned to the high level H, and the predetermined time is reached. After t1 (FIG. 1, T5), the low level is changed again.
[0015]
The VOX transmission operation performed while controlling the transmission end reference level will be described in more detail with reference to the block diagram of FIG. 2 and the flowchart of FIG. When the power of the radio is turned on, the transmission start reference level and the transmission end reference level stored in advance in the storage means 31 are transferred to the comparison means 22 and 23.
[0016]
When the user inputs sound from the microphone 11, the input level from the microphone 11 is detected and captured by the detecting means 21 (step S1). If not transmitting (step S2), the input level is compared with the reference level for starting transmission. Comparison is made by means 22 (step S3). If the input level exceeds the transmission start reference level, the transmission holding counter of the transmission holding means 25 is cleared (step S4), and the transmission end reference level of the comparison means 23 is set to the high level H. (Step S5) After further clearing the transmission time measuring counter of the transmission time measuring means 26 (Step S6), the transmission circuit 12 is operated through the transmission circuit control means 27 with the output of the comparison means 22 to start transmission. (Step S7) At the same time, the transmission time measuring counter of the transmission time measuring means 26 is started to start the transmission time measurement (Step S8).
[0017]
When transmission is started, every time the input level from the microphone 11 is detected by the detecting unit 21 and captured, the input level is compared with the reference level for ending transmission by the comparing unit 23 (step S9). At this time, the transmission time is measured by the transmission time measurement counter of the transmission time measuring means 26, and the input level is compared with the high level H of the transmission end reference level within a fixed time t1 from the start of transmission. On the other hand, when a predetermined time t1 has elapsed from the start of transmission (step S10), the transmission end reference level is changed to the low level L by the changing means 24 in response to the output of the transmission time measuring means 26 (step S11). After time t1, the low level L and the input level are compared by the comparison means 23. Therefore, even after the start of transmission, even if the user's speaking volume decreases and the input level from the microphone decreases with the passage of time, the transmission end reference level has been changed to the low level L, so the input level is the transmission end reference level. Is prevented, and as a result, the transmission end state described later is prevented.
[0018]
In the comparison by the comparison means 23, when it is determined that the input level is lower than the transmission end reference level and the lower level is the first lower level (steps S9 and S12), the transmission holding means receives the output from the comparison means 23. The transmission holding counter 25 starts (step S13), and measurement of the transmission holding time t2 is started. If the input level does not exceed the transmission start reference level during the transmission holding time t2, the transmission circuit control means 27 receives the output from the transmission holding means 25 after the transmission holding time t2 elapses. The operation is stopped and the transmission ends (steps S14 and S15). On the other hand, if the input level exceeds the transmission start reference level within the transmission holding time t2, the transmission holding counter of the transmission holding means 25 is cleared and the transmission time measuring counter of the transmission time measuring means 26 is restarted from zero. To continue the transmission state. Further, after the transmission end reference level is changed to the low level L, if the input level exceeds the transmission start reference level, the transmission end reference level is once returned to the high level H, and the transmission time measuring means 26 The transmission end reference level is changed to the low level L again after a predetermined time t1 measured in step (1).
[0019]
As described above, according to the above wireless device, the transmission end reference level is changed to the low level L after the elapse of a certain time t1 after the start of transmission. Therefore, even after the start of transmission, the volume of the user's speaking decreases as time passes, and even if the input level from the microphone decreases, the input level is prevented from falling below the transmission end reference level. Transmission is prevented from being terminated midway. In addition, even if a conversation is performed using VOX for a long time, it is not necessary to be aware of breathing.
[0020]
Also, after the transmission end reference level is changed to the low level L, when the input level exceeds the transmission start reference level, the transmission end reference level is once returned to the high level H. When the level suddenly drops from the level state and the input level falls below the transmission end reference level, the input level drop is detected without delay at the high level H transmission end reference level, and the transmission ends. be able to. Therefore, according to the above wireless device, when the level suddenly drops from a large input level state and it is clear that the user's talk is over, it can be set to end transmission without delay, and the user's talk When the sound volume gradually decreases due to breathing, it is possible to prevent a situation in which transmission ends in the middle of talking even if the sound volume decreases.
[0021]
Further, as apparent from FIG. 2, the VOX transmission operation as described above can be realized by using the microprocessor 20 and the EEPROM (storage device) 30 that are usually provided in any of the radio units. Without the need for a circuit, it can be easily realized without cost increase by simply modifying the software.
[0022]
It should be noted that if the method of decreasing the input level is detected, the breathing cycle of the user can be detected, so that the constant from the breathing cycle until the transmission end reference level is changed from the high level H to the low level. By adjusting the time t1, it is possible to avoid a transmission end state in the middle of the talk.
[0023]
【The invention's effect】
As described above in detail, according to the wireless device of the present invention, it is possible to prevent the end of transmission in the middle of talking without requiring an additional circuit, and it is not necessary to be aware of breathing. Become.
[Brief description of the drawings]
FIG. 1 is a time chart showing a VOX transmission operation of a wireless device according to an embodiment of the present invention.
FIG. 2 is a block diagram showing an embodiment of a radio device of the present invention.
FIG. 3 is a flowchart showing a VOX transmission operation of the wireless device according to the embodiment of the present invention.
FIG. 4 is a time chart showing a conventional VOX transmission operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Microphone 12 Transmission circuit 13 Antenna 20 Microprocessor 21 Input level detection means 22 Transmission start reference level comparison means 23 Transmission end reference level comparison means 24 Transmission end reference level change means 25 Transmission holding means 26 Transmission time measurement means 27 Transmission Circuit control means 30 EEPROM
31 Reference level storage means for transmission start and end

Claims (3)

When the input level from the microphone exceeds the reference level, transmission starts.When the input level falls below the reference level, transmission is held for a certain period of time.If the input level does not exceed the reference level during that period, transmission is started. In the radio of the VOX transmission operation to be terminated,
The wireless apparatus according to claim 1, wherein the reference level includes a transmission start reference level and a transmission end reference level, and the transmission end reference level is lowered after a predetermined time from the start of transmission. After the transmission end reference level is lowered, if the input level from the microphone again exceeds the transmission start reference level, the transmission end reference level is returned to the original high level before being lowered. 2. The radio according to claim 1, wherein the level is lowered again after the predetermined time. Means for detecting the user's breathing cycle by detecting how the microphone input level is lowered by the user's voice;
3. The radio according to claim 1, further comprising: means for adjusting the predetermined time until the transmission end reference level is lowered according to a breathing cycle detected by the means. 4. Machine.

Images