JPH10215217A - Portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically control a received sound volume to that fitted to the call environment of a portable telephone set by always monitoring transmission frame energy transferred from a base station. SOLUTION: When an outgoing format stored in a transmission circuit 3 in the state of an automatic sound control mode, for example, is transmitted, the encoding/decoding device DSP 5 of an opposite terminal receives the outgoing format and analyzes the format. Thus, transmission frame energy is found by calculating a TCH part for the encoding/decoding of the digital sound compression of the format by a prescribed calculation expression, and transmission frame energy is informed to CPU 4. CPU 4 calculates a present noise level from the value of transmission frame energy informed from a transmission device anti the attenuation level quantity of a noise cancellor is instructed. Thus, the noise level of a transmission side is automatically analyzed on a reception side and the attenuation level is controlled, based on the analyzed value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention realizes an optimum communication environment by monitoring the value of the transmission frame energy transferred from a base station and adjusting the attenuation level of a noise canceller based on the monitoring result. Related to mobile phones.

[0002]

2. Description of the Related Art Recently, as a simple system that can be used by a portable telephone, a place such as a PHS (Personal Handy Horn System) where radio waves are difficult to reach, such as a bull street or an underground mall, or a local area within a service area, has a small traffic volume. The present invention relates to a wireless base station suitable for use in a system having many places. In a conventional mobile phone used for such a radio base station, by using a noise canceller function to increase the transmission volume and the reception volume, for example, even in a noisy environment, even a small voice. I could talk easily.

[0003]

However, in such a conventional portable telephone, when the transmission volume is increased, the echo on the receiving side is increased by the increased volume, and the reception volume is also reduced. Since it rises at the same time, there is a problem that the echo is further amplified. Therefore, it was not possible to make a comfortable call. Also, since the receiving sound volume is amplified regardless of the surrounding environment, the receiving sound may be noisy in a quiet environment. Furthermore, it is possible to suppress the noise level by operating the noise canceller function, but if the other party is in a noisy situation while the noise canceller is operating from the beginning, raising the reception volume will also reduce the noise level. There was a problem that it was difficult to make calls.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and has an antenna, a radio unit, a line control unit, and a control unit. In a mobile phone that performs communication with a base station, the current noise level is determined by monitoring the value of the transmission frame energy transmitted from the base station specified by the RCR standard. Therefore, the present invention provides a mobile phone in which the reception volume suitable for the communication environment of the mobile phone is automatically adjusted.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the mobile phone of the present invention, FIG. 2 is a flowchart for explaining the operation of the mobile phone of the present invention, and FIG. 3 is a format transferred between the mobile phone of the present invention and a base station. FIG. 3 is a diagram illustrating a configuration.

In FIG. 1, 1 is an antenna for transmitting and receiving data to and from a base station (not shown), 2 is a receiving circuit for receiving data transferred from the base station, and 3 is a base station. A transmission circuit 5 for transmitting data, a DSP 5 for encoding and decoding data received by the receiving circuit 2 and transmission data for transmitting the data, and a DSP 8 for amplifying audio. Speakers and
Reference numeral 9 denotes a microphone for inputting voice, and 7 converts a digital signal transferred from the DSP 5 into an analog signal.
Further, a codec for converting an analog signal from the microphone 9 into a digital signal, a memory 6 for storing received data and transmission data, and a CPU 4 for controlling these members are provided. I have. In FIG. 3, (a) shows the uplink format from the mobile phone to the base station, and (b) shows the downlink format from the base station to the mobile phone. Here, the 4-bit R stored at the beginning of the format is called ramping, and indicates that data has been sent. Next, the 2-bit P is called a preamble and is used to control data transfer. The TCH of 224 bits is used for encoding and decoding of digital audio compression in the VSELP and PSI-CELP systems. As described above, the SW (synchronization word) having the 20-bit configuration and the CC having the 8-bit configuration are successively formatted with the color code. However, since these are not directly related to the present invention, the details are omitted. The operation of the mobile phone according to the present invention will be described with reference to FIGS.

(1) When the attenuation level automatic adjustment of the noise canceller is performed on the receiving side, first, the automatic voice control mode shown in FIG. 3 is activated (S1). Then, in the automatic voice control mode, the receiving circuit 2 receives a message in the downlink format shown in FIG. 3B from the antenna 1 shown in FIG. The DSP 5 analyzes the downlink format received by the receiving circuit 2, calculates the TCH portion of the format by a predetermined formula, obtains the transmission frame energy (R ₀ ), and The energy (R ₀ ) is notified to the CPU 4 (S2). The CPU 4 calculates the current noise level from the value of the transmission frame energy (R ₀ ) notified from the DSP 5 (S3). Then, the CPU 4 instructs the amount of attenuation level of the noise canceller from the calculated noise level (S4). The DSP 5 instructed by the CPU 4 changes the attenuation level of the noise canceller (S5). (1) When the attenuation level automatic adjustment of the noise canceller is performed on the transmission side, first, the automatic voice control mode shown in FIG. 3 is activated (S1). 3 stored in the transmission circuit 3 in the automatic voice control mode.
When the uplink format shown in (a) is transmitted from the antenna 1 shown in FIG. 1, the DSP 5 of the partner terminal receives this uplink format and analyzes the format,
The transmission frame energy (R ₀ ) is obtained by calculating the TCH part of the format by a predetermined formula,
Then, the transmission frame energy (R ₀ ) is calculated as CP
U4 is notified (S2). The CPU 4 calculates the current noise level from the value of the transmission frame energy (R ₀ ) notified from the DSP 5 (S3). And CPU4
Indicates the amount of attenuation level of the noise canceller from the calculated noise level (S4). CPU
The DSP 5 instructed from step 4 changes the attenuation level of the noise canceller (S5). As described above, the noise level on the transmitting side is automatically analyzed on the receiving side, and the attenuation level can be controlled based on the analysis value, so that a comfortable call can always be realized.

The above is summarized in FIG. 4 and summarized.

[0009]

As described above, according to the present invention, the value of the transmission frame energy is always monitored from the TCH portion stored in the uplink and downlink formats, and the attenuation level amount is changed based on the value to thereby always provide a comfortable operation. Call was realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a mobile phone according to the present invention.

FIG. 2 is a flowchart illustrating the operation of the mobile phone of the present invention.

FIG. 3 is a diagram illustrating a format configuration transferred between a mobile phone and a base station according to the present invention, wherein (a) is an uplink format from the mobile phone to the base station;
(B) is a downlink format from the base station to the mobile phone.

FIG. 4 is a diagram summarizing attenuation level adjustment of a noise canceller when the mobile phone of the present invention is used.

[Explanation of symbols]

 Reference Signs List 1 antenna 2 reception circuit 3 transmission circuit 4 CPU 5 DSP 6 memory 7 CODEC 8 speaker 9 microphone

Claims (2)

[Claims] 1. A portable telephone having an antenna, a radio unit, a line control unit, and a control unit, and communicating with a base station connected to a telephone network and converting a communication signal into a radio signal.
The mobile phone is defined by the RCR standard, and by monitoring the value of the transmission frame energy transferred from the base station, the reception volume suitable for the communication environment of the mobile phone is automatically adjusted. Mobile phone. 2. The portable telephone according to claim 1, wherein when the value of the transmission frame energy is large, the attenuation level of the noise canceller is increased to realize an optimal communication environment.