JPH09116956A - Control information transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reserve transmission of control information at a required minimum and to minimize deterioration in voice quality or speech quality to the utmost in the case of inserting the control information to a voice channel and transmitting the resulting channel. SOLUTION: Control information to be sent to a base station is given from a system control section 30 to buffers 26, 27 in a cellular radio telephone set. A transmission validity is added to the control information. A voice detection section 28 detects a voice channel while identifying a voiced period and a silence period of the voice channel. A transmission control section 29 sends the control information to the voice channel from the buffers 26, 27 regardless of the voiced period or the silence period when the buffers 26, 27 are fully occupied. When the control information whose transmission validity is close to expiration is in existence, the control information is sent to the voice channel regardless of the voiced period or the silence period. In other cases, the control information is sent to the voice channel from the buffers 26, 27 for the silence period only.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control information transmission device for inserting control information into a voice channel and transmitting it, such as a digital cellular radio telephone.

[0002]

2. Description of the Related Art In recent years, in the field of wireless communication, a system for transmitting control information using a voice band has been widely adopted in order to make a wireless band to be used as narrow as possible.

Specifically, for example, in a digital cellular radio telephone, on the receiving side, a transmission signal from a base station in which control information is added to digital voice information is received and demodulated by a reception demodulation section, and the reception demodulated transmission is carried out. The signal is supplied to the audio decoding unit, the analog audio information and the control information are extracted from the audio decoding unit, the analog audio information is supplied to the speaker, and the control information is imported to the control unit having the CPU. .

On the transmitting side, the analog audio information from the microphone is converted into digital audio information by the audio encoding unit, and the digital audio information is added with the control information sent from the above control unit to be modulated. It is modulated and transmitted by the transmitter.

In general, as a method of transmitting control information using a voice band in this way, a method of instantaneously stopping voice when transmitting control information, or controlling only in a silent section of a voice channel Methods of transmitting information have been considered.

[0006]

However, the method of momentarily stopping the voice when transmitting the control information can ensure the maximum transmission of the control information, but the voice quality, that is, the call quality in the case of the wireless telephone. There is a drawback that damages.

Further, in the method of transmitting the control information only in the silent section of the voice channel, the voice quality, that is, the call quality in the case of the wireless telephone can be secured to the maximum, but the silent section of the voice channel can be known in advance. Difficult,
Since the control information must be transmitted after actually detecting the silent section, and the delay amount and throughput when transmitting the control information in the detected silent section are also uncertain, depending on the state of the voice channel. Cannot transmit necessary control information at a desired timing, and there is a disadvantage that it is difficult to secure the minimum required transmission of control information.

Therefore, the present invention provides a control information transmitting apparatus for inserting control information into a voice channel for transmission,
The transmission of control information can be ensured to a necessary minimum, and the deterioration of voice quality or call quality can be suppressed to a minimum.

[0009]

According to the present invention, in a control information transmitting apparatus for transmitting control information by inserting it in a voice channel, a buffer for holding control information to be transmitted,
A transmission deadline detection unit that detects the transmission deadline of the control information held in this buffer, and a voice detection unit that distinguishes and detects the sound section and the silent section of the audio channel are provided, and the detection of the above-mentioned transmission time limit detection unit Based on the output and the detection output of the voice detection unit, when the transmission deadline of the control information held in the buffer is approaching, regardless of whether it is a voiced section or a silent section of the voice channel, When the control information is transmitted from the buffer to the audio channel, and the transmission time limit of the control information held in the buffer is not approaching, the control section waits for a silent section of the audio channel and sends the control information from the buffer to the audio channel. To send to.

The control information held in the buffer to be sent to the voice channel includes information that should be sent to the voice channel early and information that does not need to be sent to the voice channel early.

In the control information transmitting apparatus of the present invention configured as described above, the control information to be transmitted to the voice channel at an early stage may be a voiced section or a silent section of the voice channel. Instead, it is sent to the audio channel early. Therefore, control information that should be sent to the voice channel early may be sent to the voice channel in the voiced section of the voice channel, which may impair voice quality or call quality. Reserved.

On the other hand, the control information that does not need to be sent to the voice channel early is sent to the voice channel only in the silent section of the voice channel. Therefore,
For control information that does not need to be sent to the voice channel early, not only is transmission of control information secured,
It does not impair voice quality or call quality.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a control information transmitting apparatus of the present invention, in which the present invention is applied to a digital cellular radio telephone. The digital cellular radio telephone of this example is composed of a reception system 10, a transmission system 20, a system control unit 30, an operation input unit 40, and a display unit 50 as a whole.

The reception system 10 comprises a reception demodulation unit 11, a voice decoding unit 12, a voice amplification unit 13, a speaker 14, and a control information reception buffer 15, and is provided from a base station in which control information is added to digital voice information. The transmission signal is received and demodulated by the reception demodulation unit 11, and the transmission signal subjected to the reception demodulation is supplied to the speech decoding unit 12, and the speech decoding unit 1
From 2, analog voice information and control information are extracted.

Then, the analog voice information is supplied to the speaker 14 through the voice amplifying section 13, and
The control information is taken into the system control unit 30 via the control information reception buffer 15.

The system control unit 30 is composed of, for example, a microcomputer, and has a CPU 31 and a ROM 3
2 and RAM 33, and controls each unit. ROM
A control program to be executed by the CPU 31, including a control information transmission processing routine 100 shown in FIG. 2 and described later, and various necessary data are written in 32.

The RAM 33 is used as a work area for the CPU 31, and is used for writing various data such as reception records, or for registering various data required by a user's operation on the operation input section 40.

The transmission system 20 includes a microphone 21, a voice amplifier 22, a voice encoder 23, a switch circuit 24, a modulation transmitter 25, control information transmission buffers 26 and 27, a voice detector 28, and a transmission controller 29. The analog voice information from the microphone 21 is supplied to the voice encoding unit 23 through the voice amplification unit 22 and converted into digital voice information, and the digital voice information is switched by the switch circuit 24.
Is supplied to the modulation transmission section 25 through the modulation transmission section 25 and is modulated and transmitted.

The control information to be transmitted to this voice channel and to be transmitted from the modulation / transmission unit 25 to the base station is input from the system control unit 30 to the control information transmission buffers 26 and 27 to be transmitted to the control information transmission buffers 26 and 27. Held in.

However, the control information input from the system control unit 30 to the control information transmission buffers 26 and 27 is the time at which the control information is added to the current time, and the time at which the control information should be transmitted to the voice channel. That is, the transmission time limit of the control information is added.

The control information whose transmission deadline is within a predetermined time with respect to the current time is input to the control information transmission buffer 26 as high priority control information to be transmitted to the voice channel early. At the same time, the control information whose transmission deadline exceeds the predetermined time with respect to the current time is input to the control information transmission buffer 27 as control information of low priority, which does not need to be transmitted to the voice channel early.

Further, control information transmission buffers 26 and 27
Is added with a buffer state detection flag indicating whether or not the buffer is full.

The voice detection unit 28 identifies and detects a voiced section and a silent section of the voice channel from the digital voice information from the voice encoding unit 23.

The transmission control unit 29 has therein a transmission time limit detection unit for detecting the transmission time limit of the control information held in the control information transmission buffers 26 and 27, that is, the time when the control information should be transmitted to the voice channel. 29a, and
It has a buffer state detection unit 29b for detecting whether or not the control information transmission buffer 26 or 27 is full from the above-mentioned buffer state detection flag.

Then, the transmission control unit 29 is based on the detection outputs of the transmission time limit detection unit 29a and the buffer state detection unit 29b and the detection output of the voice detection unit 28, as shown in FIG.
In accordance with the control information sending processing routine 100 shown in (1), the switch circuit 24 is switched as follows, and the control information held in the control information sending buffers 26 and 27 is sent to the audio channel.

That is, the control information transmission processing routine 10
0 starts at step 101 by inputting control information from the system control unit 30 to the control information transmission buffer 26 or 27, and first at step 102, transmits control information from the detection output of the buffer state detection unit 29b. It is determined whether the buffer 26 or 27 is full.

When the control information transmission buffer 26 or 27 is full, the routine proceeds from step 102 to step 103, regardless of the detection output of the voice detector 28, that is, the voice section of the voice channel. Irrespective of whether or not there is a silent section, the switch circuit 24 is switched to the side of the transmission control unit 29, and the control information held in the control information transmission buffer 26 or 27 in the full state is transmitted to the voice channel. In this case, the control information is transmitted to the audio channel in the order of the transmission deadline being closer to the current time.

When both the control information transmission buffers 26 and 27 are not full, the routine proceeds from step 102 to step 104, where the control information held in the control information transmission buffers 26 and 27 is detected from the detection output of the transmission time limit detecting section 29a. It is determined whether or not there is control information whose transmission deadline is approaching the present time within a predetermined time.

When there is control information whose transmission deadline is approaching the present time within the predetermined time, the routine proceeds from step 104 to step 103, regardless of the detection output of the voice detector 28, that is, the voice channel. Regardless of whether it is a voiced section or a silent section of
The switch circuit 24 is switched to the transmission control unit 29 side, and the control information whose transmission time limit is approaching the present time within a predetermined time is transmitted to the audio channel. Also in this case, the control information is transmitted to the audio channel in the order of the transmission deadline being closer to the current time.

If the control information held in the control information transmission buffers 26 and 27 does not include the control information whose transmission deadline is approaching the present time within the predetermined time, step 1
The routine proceeds from 04 to step 105, and it is judged from the detection output of the voice detection unit 28 whether or not the current time is a silent section of the voice channel.

When the current time is in the silent section of the voice channel, steps 105 to 10
In step 6, the switch circuit 24 is switched to the transmission control unit 29 side, and the control information held in the control information transmission buffers 26 and 27 is transmitted to the audio channel in the order in which the transmission deadline is closer to the current time.

When the current time is not in the silent section of the voice channel, that is, in the voiced section, the control information transmission processing is terminated without transmitting the control information held in the control information transmission buffers 26 and 27 to the voice channel. To do.

As described above, according to the above-described embodiment, when the control information transmission buffer 26 or 27 is full, or in the control information held in the control information transmission buffers 26 and 27, the transmission time limit is the current time. When there is control information approaching within a predetermined time, the control information transmission buffer 26 or 27 in the full state is irrespective of whether the audio channel is a voiced section or a silent section.
The control information stored in the control channel or the control information whose transmission deadline is approaching the present time within a predetermined time is transmitted to the voice channel and transmitted to the base station.

Therefore, for the control information held in the control information transmission buffer 26 or 27 which is full, or the control information whose transmission deadline is approaching the present time within a predetermined time, the voice information is transmitted in the voice section of the voice channel. Although it may be sent to the channel and may impair the call quality, transmission of control information is secured.

On the other hand, the control information transmission buffer 26
And 27 are not full, and if the control information held in the control information transmission buffers 26 and 27 does not include control information whose transmission deadline is approaching the present time within a predetermined time, The control information held in the control information transmission buffers 26 and 27 is sent to the voice channel only in the silent section, and the control information is not sent to the voice channel in the sound section of the voice channel, so that the transmission of the control information is secured. Moreover, it does not impair the call quality.

Therefore, as a whole, the transmission of the control information is ensured to the minimum necessary and the deterioration of the call quality is suppressed to the minimum. Further, there is no need to consider uncertain factors such as the delay amount and throughput when transmitting control information in a silent section, such as when transmitting control information only in a silent section of a voice channel.

The present invention is not limited to digital cellular radiotelephones, but can be widely applied to control information transmission devices that insert control information into a voice channel for transmission.

[0038]

As described above, according to the present invention, transmission of control information can be ensured to the minimum necessary, and deterioration of voice quality or call quality can be suppressed to the minimum.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a digital cellular radiotelephone according to an embodiment of a control information transmission device of the present invention.

FIG. 2 is a flowchart showing a control information transmission processing routine.

[Explanation of symbols]

 10 reception system 11 reception demodulation unit 12 voice decoding unit 14 speaker 15 control information reception buffer 20 transmission system 21 microphone 23 voice encoding unit 24 switch circuit 25 modulation transmission unit 26, 27 control information transmission buffer 28 voice detection unit 29 transmission control Part 29a Transmission deadline detection part 29b Buffer state detection part 30 System control part

Claims (2)

[Claims] 1. A control information transmitting apparatus for transmitting control information by inserting it into a voice channel, and a buffer for holding control information to be transmitted, and a transmission deadline detection for detecting a transmission deadline of the control information held in this buffer. Section and a voice detection section for detecting a voiced section and a silent section of a voice channel by detecting the voiced section and the voiced section. When the transmission deadline of the controlled information is approaching, the control information is transmitted from the buffer to the audio channel and held in the buffer regardless of whether the audio channel is a voiced section or a silent section. When the deadline for sending the control information is not approaching, the control section waits for the silent section of the audio channel and sends the control information from the buffer. Serial sending a voice channel, control information transmitting apparatus. 2. The control information transmission device according to claim 1, further comprising a buffer state detection unit for detecting whether or not the buffer is full, and the buffer is detected based on a detection output of the buffer state detection unit. When it is full, regardless of whether it is a sound section or a silence section of the above audio channel,
A control information transmission device for transmitting control information from the buffer to the audio channel.