JPH01189215A - Voice output device - Google Patents

Abstract

PURPOSE:To automatically change a sound volume and a sound quality according to the degree of a noise quantity by installing the detector of a surrounding noise in a place to which a voice is outputted, and feeding back the quantity and quality of the detected noise to the adjusting part of the output quantity of a voice output device and an output sound quality. CONSTITUTION:For a sound signal from a speech synthesizer 1, the voice is outputted through a gain variable amplifier 2 from a loudspeaker 3, the gain variable amplifier 2 changes an amplification degree of the noise quantity obtained from a microphone 6 installed around the place, to which the voice is outputted, by means of a control signal fed back from a detector 5 and a gain control signal generating part 4, and the voice output quantity of the loudspeaker 3 is controlled. At such a time, by causing the microphone 6 and detector 5 to have frequency characteristics, extracting a specific frequency band component out of the noise and making it into a gain control signal, the voice output quantity of the loudspeaker 3 is controlled. Further, it is hoped that a system made non-responsive to the self-voice output quantity is added to a surrounding noise detecting system including the microphone 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an audio output device that can be used in an audio output device or a broadcasting device used in automatic vending machines, station announcements, and the like.

2. Description of the Related Art Conventionally, audio output devices include, for example, as shown in FIG.
A manual volume and/or sound quality adjustment device is provided between the voice synthesis device 1 and the speaker 3, and is arbitrarily adjusted depending on the quietness or liveliness of the environment.

Problems to be Solved by the Invention Conventionally, voice output devices such as voice synthesizers used in vending machines, etc., do not distinguish between loud noises during the day and low noise at night, and are the same. Volume·
Audio is output in good quality. Therefore, if you adjust the volume and sound quality to an appropriate level during the daytime noise, the sound will be very loud at night when there is less noise, and it will become a source of noise for people other than audio users. In addition, manual adjustment is costly.

A similar problem occurs with station announcements on trains that pass through residential areas; unless the volume and quality are manually adjusted at night, the announcements become a source of noise for people living near the station. This is especially a big problem at unmanned stations.

Means to solve the problem: Install a device to detect ambient noise at the location where audio is output, and feed the detected amount and quality of the noise back to the output amount and output sound quality adjustment section of the audio output device. .

In the device of the present invention, after detecting the amount of noise, information corresponding to the amount is fed back to the audio output device, so that when the amount of noise is large, the audio output is increased, and when the amount of noise is small, the audio output is increased. Each automatically adjusts to reduce the amount of audio output,
By changing the volume and sound quality depending on when the noise level is high or low,
It becomes possible to change the range that the audio output reaches.

Embodiment An example of the present invention will be explained based on FIG. In the figure, the audio signal from the audio synthesizer 1 is transmitted to the variable gain amplifier 2.
Audio is output from the speaker 3 through the. The variable gain amplifier 2 changes the degree of amplification using a control signal fed back from a detector 5 and a gain control signal generating section 4 to obtain the amount of noise obtained from a microphone 6 installed in the vicinity when audio is output. Controls the audio output amount of the speaker 3.

At this time, the microphone 6 and the detector 5 are given frequency characteristics to extract specific frequency band components from the noise.
The audio output amount of the speaker 3 is controlled by using the gain control signal. Note that it is desirable to add a method to the ambient noise detection system including the microphone 6 so that it does not respond to its own audio output amount.

As another example of the present invention, an example will be given in which the quality of the audio output is controlled by the level of a specific frequency band of noise. In this case, as shown in FIG. 2, the sound quality of the speaker output is controlled by dividing into a section 7 for gain controlling the high frequency region of the sound and a section 8 for gain controlling the low frequency region. At this time, microphone 6
A filter 11.13 separates and detects a specific frequency band component from the noise obtained from the noise, and feeds it back to a gain control amplifier 7.8 from a gain control signal generator 10.12. The outputs of the gain control amplifiers 7.8 are added by an adder 9, and
The sound quality-controlled sound is output from the speaker 3.

As another example of the present invention, as shown in FIG. 3, a configuration is also possible in which the output from the gain control signal generator 4 is directly fed back to the speech synthesizer to control the volume and sound quality.

Effects of the Invention The use of the present invention will cause social problems in audio output devices such as vending machines where it is extremely difficult to manually adjust the volume and quality of the audio output, especially in voice synthesis devices aimed at saving labor. It has an effective effect on noise problems.

[Brief explanation of the drawing]

1, 2, and 3 are circuit block diagrams of each embodiment of the present invention, and FIG. 4 is a circuit block diagram of a conventional example. ■...Speech synthesizer, 2...Variable gain amplifier, 3...Speaker, 4.10.12...
...Gain control signal generator, 5...Detector,
6... Microphone, 7... Variable high-range gain amplifier, 8... Variable low-range gain amplifier, 9.
... Adder, 11 ... High-frequency detector, 13
...Low frequency detector. Name of agent: Patent attorney Toshio Nakao and 1 other person @2 Figure 4

Claims (1)

[Claims] An audio output device characterized in that an ambient volume detector is provided at a location where the audio generated by the audio output device is output, and the volume or quality of the audio of the output device is automatically adjusted based on the detected volume.