JPH04373297A - Automatic sound volume adjuster - Google Patents

Abstract

PURPOSE:To make a voice heard with the telephone easy to hear by detecting a audible ringing signal with a microphone so as to make a controlling microcomputer decrease or mute a sound volume of an acoustic device based upon the detected signal. CONSTITUTION:When an audible ringing signal 2 is transmitted from a telephone set 1 while an audio equipment (hereinafter referred to as an equipment) is operated, a microphone 3 detects the sound 2 to be transferred to a controlling microcomputer 12. The microcomputer 12 examines this signal by carring out a comparison if the signal includes a component of the same quality with that of the data for the telephone set 1 itself which was read out from a memory 6. If it is decided that there exists a component of the same quality, the microcomputer 12 examines an voice sound signal of the equipment inputted from a second A/D converter 11, by carring out a comparison, if the signal includes a component of the same quality with that of a memory data. If it is decided that the equipment does not include, so to speak, a pseudo signal which has the same quality as that of the sound 2, the microcomputer decides that there exists no component of the same quality. Thus, the fact that the sound 2 is actually radiated is confirmed and the microcomputer 12 outputs a control signal for decreasing or muting a sound to an electronic variable resister.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a color television receiver,
Alternatively, the present invention relates to an automatic volume adjustment device that detects the sound of a call when a phone call is received while the audio equipment is in operation, and automatically reduces or mutes the volume of the audio equipment.

0002

2. Description of the Related Art Conventionally, automatic sound reduction or automatic muffling as described above has not been performed.

0003

[Problem to be Solved by the Invention] Therefore, when the volume of a television receiver, etc. is high, or when a telephone is placed near a television receiver, etc., it may be difficult to hear the voice of the person on the other end of the phone. In such cases, the volume of the TV receiver etc. had to be manually reduced. SUMMARY OF THE INVENTION In order to improve this problem, an object of the present invention is to provide an automatic volume adjustment device that automatically reduces or mutes the volume of a television receiver, etc., to a certain level or less when a call tone is emitted from a telephone. shall be.

0004

[Means for Solving the Problems] The present invention provides a color television receiver or an audio device in which the volume is controlled by controlling the electronic volume using a control signal from a control microcomputer. a detection microphone; a first bandpass filter that passes a predetermined frequency band of the signal detected by the microphone;
a first A/D conversion circuit that converts the analog signal from the first bandpass filter into a digital signal; a memory section that stores in advance the call tone of the telephone as data;
An audio signal from an audio signal processing circuit is input to the electronic volume, and a second bandpass filter passes a predetermined frequency band of the audio signal, and converts the analog signal from the second bandpass filter into a digital signal. a second A/D conversion circuit that converts the data into a second A/D conversion circuit, and a comparison to determine whether or not there is a component of the same quality as the data from the memory section in the signal from the first A/D conversion circuit; The /D conversion circuit compares whether or not there is a component of the same quality as the data from the memory section in the signal, and as a result of the comparison, it is determined that the component of the same quality as the data is present in the first A.
/D conversion circuit, and is included in the signal from the second
The present invention provides an automatic volume adjustment device comprising a control microcomputer that controls the electronic volume so as to reduce or mute the volume only when the electronic volume is not included in the signal from the A/D conversion circuit.

[0005]

[Operation] The call tone of the installed telephone itself is stored in advance in the memory using the microphone of this device. Thereafter, while comparing with the memory data, the control microcomputer controls the electronic volume so as to automatically reduce or mute the sound when the call sound of the telephone is detected. When the audio signal of a television or the like contains a signal component of the same quality as the memory data, the above function is stopped.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An automatic volume adjustment device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of essential parts showing an embodiment of an automatic volume adjustment device according to the present invention. In the figure, 1 represents a telephone, 2 represents the call tone of the telephone 1, and 3
4 is a microphone (hereinafter referred to as microphone) that detects the call sound and converts the collected sound signal into an electrical signal; 4 is a first bandpass filter that passes the frequency band of the call sound;
5 is a first A/D conversion circuit that converts the analog signal from the first BPF 4 into a digital signal, and 6 is a circuit that collects the call sound of the telephone 1 itself using the microphone 3. A memory section stores in advance the sound electrical signal as data, 7 is an audio processing circuit that performs general processing of the audio signal such as amplification or frequency correction of the audio signal, 8 is a maximum level input from the audio processing circuit 7, An electronic volume that changes and outputs under the control of the control microcomputer 12 within a range up to zero level (mute); 9 is an audio signal output terminal of the electronic volume 8; 10 is a predetermined band from the signal from the audio processing circuit 7; A second band pass filter (hereinafter referred to as second BPF) which is a filter that passes the component and has characteristics equivalent to the first BPF;
a second A/D conversion circuit that converts an analog signal from the PF 10 into a digital signal; 12 a control microcomputer that controls the electronic volume; 13 a control signal output line;
4 is a color television receiver or audio equipment.

Next, the operation of the present invention will be explained with reference to FIG. 2 as well. FIG. 2 is a flowchart for explaining the operation of the control microcomputer 12. ST numbers in the following description indicate each step in FIG. When a call sound is emitted from the telephone 1 while the television receiver or audio equipment (hereinafter referred to as the equipment) is in operation, the microphone 3 detects the call sound, and the first BPF 4 and the first A/D conversion circuit 5, the signal is transmitted to the control microcomputer 12. This transmitted signal includes, in addition to the call tone, signals of various frequency components within the first BPF band, such as voices emitted from the device itself. The control microcomputer 12 compares this signal to see if there is a component of the same quality as the data of the telephone 1 itself read from the memory section 6 (ST1), and determines that there is a component of the same quality (ST1-YES). Next, the control microcomputer 12 compares whether or not there is a component of the same quality as the memory data in the audio signal of the device inputted from the second A/D conversion circuit 11 (ST2). Here, in the current explanation, if it is assumed that there is no so-called pseudo signal of the same quality as the call sound in the audio signal from the device (the case where there is a pseudo signal will be described later), the control microcomputer 12 determines that there is no homogeneous component (ST2
-NO). As a result, it is confirmed that the call sound is truly being emitted, and a control signal is output from the control microcomputer 12 to the electronic volume 8 to reduce or mute the sound (13
). Whether to reduce the sound (including the attenuation ratio) or muffle the sound is a matter of choice regarding the specifications of the device, and either can be handled by software processing of the control microcomputer.

[0008] There is a high possibility that a signal having the same quality as a call tone (the above-mentioned pseudo signal) may be included in the audio signal of the device. In such a case, the microphone 3 detects the pseudo signal in the same manner as described above and transmits a signal having the same quality as the real call sound to the control microcomputer 12. However, in this case, the second A/D
A signal of the same quality is also input from the conversion circuit 11 to the control microcomputer 12. Therefore, there is a homogeneous component in ST1 (same YES)
) Even if it is determined that there is a homogeneous component in ST2 (the same Y
ES), it is finally determined that the signal is in the audio signal from the device, and no control signal is output. 1st
Naturally, when there is no homogeneous component in the signal from the A/D conversion circuit 5, no control signal is output (ST1-NO). Note that if the true call tone and the pseudo signal are present at the same time, no control signal is output (ST2-YES route). Such a case is extremely rare, and this device does not require that much. By making the microphone extendable with an extension cord, the microphone can be placed near the telephone even if the telephone and the device are a little far apart, so that the operation of the device becomes reliable.

[0009]

As explained above, according to the present invention, when a call sound is emitted from a telephone while a television receiver or audio equipment is in operation, the call sound is detected by a microphone, and the control microcontroller uses the detection signal to detect a call sound from a telephone. Since the device automatically reduces or mutes the volume of the device, it solves the problem that it is difficult to hear the voice on the phone due to the sound coming from the device, and contributes to improving the functionality of the device.

[Brief explanation of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of an automatic volume adjustment device according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the control microcomputer 12.

[Explanation of symbols]

1　Telephone 2 Call tone 3. Microphone 4 First bandpass filter 5 First A/D conversion circuit 6 Memory section 7 Audio processing circuit 8 Electronic volume 9 Audio signal output terminal 10 Second bandpass filter 11 Second A/D conversion circuit 12 Control microcomputer 13 Control signal output line

Claims (2)

[Claims] Claim 1. A color television receiver or audio device in which volume control is performed by controlling an electronic volume using a control signal from a control microcomputer,
a microphone that detects a call sound from a telephone; a first bandpass filter that passes a predetermined frequency band of the signal detected by the microphone; and a first bandpass filter that converts the analog signal from the first bandpass filter into a digital signal. The A/D conversion circuit of the telephone, the memory unit that stores the call tone of the telephone as data in advance, and the audio signal from the audio signal processing circuit that is input to the electronic volume are input, and the audio signal passes through a predetermined frequency band. a second bandpass filter that converts the analog signal from the second bandpass filter into a digital signal, and a second A/D conversion circuit that converts the analog signal from the second bandpass filter into a digital signal; Comparison with the data from the memory section to see if there is a homogeneous component, and the second
A comparison is made to determine whether or not there is a component of the same quality as the data from the memory section in the signal from the A/D conversion circuit of the first A/D conversion circuit. and a control microcomputer that controls the electronic volume to reduce or mute the sound only when it is included in the signal from the second A/D conversion circuit and is not included in the signal from the second A/D conversion circuit. An automatic volume adjustment device characterized by: 2. The automatic volume control device according to claim 1, wherein an extension cord is attached to the microphone so that the microphone can be placed near the telephone.