JP2984714B2 - Car phone - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automobile telephone installed in an automobile.

(Prior art)

2. Description of the Related Art In recent years, automobile telephones installed in automobiles have been remarkably popularized so that they can talk during driving. As automobile automobiles, a telephone having a handset or a microphone installed on, for example, a front pillar, and calling an instrument panel are called. There is a display screen that can be operated by screen operation, and there is a hand-free type with a speaker installed at the lower part of the front door so that you can talk with both hands free, etc. Various efforts have been made to achieve this.

For example, an automobile telephone disclosed in Japanese Utility Model Laid-Open Publication No. 61-195661 has a telephone number of an arbitrarily selected partner stored in a storage means in advance, and a telephone number of a desired partner is displayed from the storage means. The call operation is facilitated by, for example, pressing a telephone number by automatically calling the other party with the telephone number displayed by the ON signal of the call switch.

[Problems to be solved by the invention]

However, in the above-mentioned conventional automobile telephones, especially hands-free automobile telephones, if the user tries to talk while driving with the window open, wind noise comes in from outside, and the voice of the occupant becomes a wind noise. There was a problem that it was very difficult to open because of the noise.

In addition, in order to prevent muffled voices in a normal telephone call, as shown in FIG.
omatic Gain Control) Since the signal larger than the value of the limit line is cut and transmitted, when the wind noise is over the sound, the signal level exceeds the AGC limit line and the sound signal is cut off As a result, there is a problem that a call failure occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle telephone capable of maintaining a clear telephone call state even when wind noise enters from a window.

[Means for solving the problem]

In order to achieve the above object, a car telephone according to the present invention comprises:
A sound collector such as a microphone and a transmitter, a storage unit in which a predetermined frequency characteristic corresponding to wind noise is stored, and a comparison between the frequency characteristic of a sound input from the sound collector and the predetermined frequency characteristic And comparing means for removing the sound having the predetermined frequency characteristic from the collected sound when the two frequency characteristics match. Further, the predetermined frequency characteristic is obtained in association with a change in speed and stored in the storage means, and a sound having the predetermined frequency characteristic corresponding to the vehicle speed is removed.

Furthermore, the sound collector is installed on the front pillar of the vehicle.

[Action]

In the automobile telephone of the present invention configured as described above, the predetermined frequency characteristic corresponding to the wind noise that varies depending on various conditions such as the traveling speed is stored in advance, and the sound input from a sound collector such as a microphone is stored. The frequency characteristics are compared with the stored predetermined frequency characteristics, and when the two frequency characteristics match, the sound having the predetermined frequency characteristics, that is, the wind noise, is removed from the sound collected by the sound collector.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a display 2 for performing a screen operation is disposed substantially at the center of an instrument panel 1, and a microphone (sound collector) 4 for transmitting is disposed on a front pillar 3 on the right side of a driver's seat. .

A speaker 71 is provided below the front door on the passenger's seat side, and a speaker 72 is provided below the front door on the driver's seat side. Usually, the speaker 71 on the passenger's seat side is used for receiving.

The steering wheel 5 is provided with a switch 6 that allows the user to operate the telephone without talking during driving.

In FIG. 2, a sound frequency characteristic signal collected by the microphone 4 is input to a comparator 8 in the telephone device 7.

The frequency characteristics of the wind noise specific to the vehicle type are obtained in advance by experiments or the like in accordance with the speed change, and the data is stored in the memory of the microcomputer 9.

In this case, as the memory of the microcomputer 9, it is preferable to store data on a floppy disk or the like so that the floppy disk or the like can be exchanged according to the type of vehicle.

In the meter 11, the vehicle speed signal is input to the comparator 8, and the frequency characteristic of wind noise specific to the vehicle type corresponding to the vehicle speed at that time is input from the microcomputer 9 to the comparator 8.

The comparator 8 compares the frequency characteristics of the sound collected by the microphone 4 with the previously stored frequency characteristics of the vehicle-specific wind noise input from the microcomputer 9 to the comparator 8. When the frequency characteristics of the noise component of the sound collected by the vehicle coincide with the frequency characteristics of the wind noise specific to the vehicle type, the frequency characteristics and phase of the
By applying a signal inverted by 0 °, a wind noise component is removed to obtain an audio signal (see FIG. 3).

The audio signal obtained by removing the wind noise component is amplified by the amplifier 10.
, And transmits from the wireless device 12.

According to this configuration, only the audio signal can be moved to a level below the AGC limit line, and a clear call can be made without cutting the audio signal.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

Frequency characteristics of sound input from a sound collector such as a microphone,
The frequency characteristics stored in advance are compared with each other, and when the two frequency characteristics match each other, the sound having the stored frequency characteristics, that is, the wind noise is removed from the sound collected by the sound collector. It can be moved to a level below the limit line, and a clear call can be made without cutting the audio signal.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a layout diagram of a hands-free type car phone, FIG. 2 is a block diagram of the same, FIG. 3 is a frequency characteristic diagram of a transmitted voice signal,
FIG. 4 is a frequency characteristic diagram of the sound input from the sound collector. 2 ... display, 4 ... microphone (sound collector), 8 ... comparator, 9 ... microcomputer.

Claims (3)

(57) [Claims] 1. A sound collector, storage means storing a predetermined frequency characteristic corresponding to wind noise, and a comparison for comparing a frequency characteristic of a sound input from the sound collector with the predetermined frequency characteristic. Means for removing the sound having the predetermined frequency characteristic from the collected sound when the two frequency characteristics match with each other. 2. The vehicle according to claim 1, wherein said predetermined frequency characteristic is obtained in correspondence with a change in speed and stored in a storage means, and a sound having said predetermined frequency characteristic corresponding to a vehicle speed is removed. For phone. 3. The vehicle telephone according to claim 1, wherein the sound collector is installed on a front pillar of the vehicle.