JPH03108899A - Sound reproduction device - Google Patents

Abstract

PURPOSE:To allow the listner to hear parts of conversation clearly in the reproduction of a source mainly consisting of conversation especially by correcting the frequency characteristic of reproduced sound in response to the content of the reproduced source in a sound reproduction device having plural sound channels. CONSTITUTION:The device is provided with a 1st storage circuit 12 storing the information relating to the frequency characteristic suitable for the sound of a source for mainly music, a 2nd storage circuit 13 storing information relating to the frequency characteristic suitable for the sound of a source for mainly conversation, a selection circuit 14 switching the storage circuits 12 and 13, and equalizer circuits 9, 10 applying frequency correction of the sound signal based on the information relating to the frequency characteristic. When the sound of a source for mainly conversation such as a drama or a news source is reproduced, the selection circuit 14 selects the 2nd storage circuit 13. Then the 1st equalizer circuits 9, 10 boost the band of human voice in a right channel sound signal 2 and a left channel signal 3 based on the information relating to the frequency characteristic suitable for the sound of the source for mainly conversation stored in the storage circuit 13 respectively.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an audio reproducing device having a plurality of audio channels, such as two-channel audio reproducing of a TV receiver, and in particular, to an audio reproducing device having a plurality of audio channels. [Prior Art] Fig. 4 is a block diagram showing a conventional audio reproduction device, such as a two-channel audio reproduction device for a TV receiver. \, (1) t±2 channel audio source, right channel audio signal (2) and left channel audio signal (3) from this 2 channel audio source (1)
are sent respectively.

(0 and (6) are respective power amplifiers, one power amplifier (0 power amplifies the above right channel audio signal (2), the other power amplifier (8) and the above left channel audio signal (3) Amplify the power.

(5) is the right channel speaker, which is driven by the power amplifier (0). (7) is the left channel speaker, which is driven by the power amplifier (8). (8)
is the listener, and the above left and right channel speakers (?),
(5) Listen to the output audio with the device facing you.

Next, the operation of the above configuration will be explained.

The left and right channel audio signals (3) and (2) sent out from the 2-channel audio source (1) are amplified by two power amplifiers (8) and (4) independently of each other, and then
The left channel speaker (7) and the right channel speaker (5) convert it into audio and output it to the listener (8).
) is perceived.

[Problem to be solved by the invention] Since the conventional audio playback device is configured as described above, it is possible to reproduce the audio of a music-based source such as a song program and the audio of a conversation-based source such as a drama or news at the same time. When playing with the playback system, there were the following problems.

In other words, as shown in Figure 2, the frequency characteristics of speakers are generally designed to have a flat sound pressure level, so although they are suitable for reproducing audio from music-based sources, they are difficult to reproduce audio from conversation-based sources. When playing back, there was a problem that the conversation part could not be heard clearly.

This invention was made to solve the above-mentioned problems, and regardless of the type of playback source, it always has frequency characteristics suitable for the audio of the playback source. The purpose of the present invention is to provide an audio playback device that can perform the following functions.

[Means to solve the problem]

The audio reproduction device according to the present invention includes a first storage circuit that stores information regarding frequency characteristics suitable for audio from a music-based source, and a second storage circuit that stores information regarding frequency characteristics suitable for audio from a conversation-based source. a selection circuit that switches between the first storage circuit and the second storage circuit;
The present invention is characterized by comprising an equalizer circuit that corrects the frequency of the audio signal based on the information regarding the frequency characteristics.

[Operation] According to the present invention, when reproducing audio from a source that focuses on conversation, the equalizer circuit corrects the frequency characteristics of the audio signal so as to boost the human voice band, thereby reducing the conversation in the reproduced audio. This part can be reproduced clearly.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram of an audio reproduction device according to an embodiment of the present invention, in which (9) is a first equalizer circuit, which performs frequency correction on the right channel audio signal (2). ) is a second equalizer circuit that performs frequency correction of the left channel audio signal (3).

(11) is a control circuit that controls the frequency correction pattern of the first equalizer circuit (8) and the frequency correction pattern of the second equalizer circuit (10).

(12) is a first memory circuit that holds information regarding frequency characteristics suitable for audio of a music-based source; (13) is a second storage circuit that holds information regarding frequency characteristics suitable for audio of a conversation-based source. The circuit (14) is a selection circuit that switches between the first storage circuit (12) and the second storage circuit (13).

Since the other configurations are the same as the conventional example shown in FIG. 4, the same reference numerals are given to the corresponding parts and detailed explanation thereof will be omitted.

Next, the operation of the above configuration will be explained.

When playing audio from a music-based source such as a song program 1
The selection circuit (14) is connected to the first storage circuit (12).
Choose. Here, the first equalizer circuit (9)
Based on the information stored in the memory circuit (12) about the frequency characteristics suitable for the sound of the music-centered source,
The right channel audio signal (2) is sent to the power amplifier (0) without frequency correction.

Similarly, the second equalizer circuit (10) sends the left channel audio signal (3) to the power amplifier (6) without frequency correction.

In general, the frequency characteristics of the speakers (5) and (7) are designed as shown in Figure 2, so if you do not perform frequency correction on the audio signal, it will not be possible to reproduce the audio of a music-based source. This is a suitable characteristic.

On the other hand, when reproducing the audio of a conversation-centered source such as a drama or news, the selection circuit (14) is connected to the second storage circuit (
13). Here, the first equalizer circuit (8) adjusts the right channel audio signal (2) based on the information regarding the frequency characteristics suitable for the audio of the conversation-centered source held in the second storage circuit (13). Boost the voice range of the person inside.

Similarly, the second equalizer circuit (10) boosts the human voice band in the left channel audio signal (3).

As a result, the frequency characteristics of the reproduced audio become as shown in FIG. 3, so that the conversation part in the reproduced audio can be heard clearly, making it suitable for the source audio mainly consisting of conversation.

The range of human voice is approximately 100 Hz to 10
Since the frequency is KHz, it is not only possible to boost all of this band, but also to boost the human voice band by dividing it into sections such as 1 KHz to 4 KHz.

In addition, there are three types of audio formats for current TV receivers: monaural broadcasting, stereo broadcasting, and bilingual broadcasting. In the case of stereo broadcasting, most programs center on music, while in the case of bilingual broadcasting, programs center on conversation. For this reason, when the audio source is the current TV receiver's 7-day broadcast, the second storage circuit (13) is automatically selected and the audio source is the current TV receiver.
In the case of bilingual broadcasting of the V receiver, the first memory circuit (1
A circuit for automatically selecting 2) may be added to the selection circuit (10).

Further, in the above embodiment, the case of 2-channel audio has been described, but it may be multi-channel audio of 2 or more channels or 1-channel audio, and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, by correcting the frequency characteristics of reproduced audio according to the content of the reproduction source,
Regardless of the type of playback source, frequency characteristics suitable for the sound of the playback source can always be obtained, and in particular, when playing back the sound of a source that focuses on conversation, the effect is that the conversation part can be played back so that it can be heard clearly. play.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an audio reproduction device according to an embodiment of the present invention, Fig. 2 is a frequency characteristic diagram suitable for audio from a music-based source, and Fig. 3 is a frequency characteristic suitable for audio from a conversation-based source. 4 are block diagrams of a conventional audio reproduction device. (5)...Right channel speaker, (7)...Left channel speaker, (9)...First equalizer circuit, (lO)...Second equalizer circuit, (11)...
...Control circuit, (12)...First memory circuit, (13)...Second memory circuit, (10...Selection circuit. In addition, the same reference numerals in the drawings indicate the same or equivalent parts. show.

Claims (1)

[Claims] (1) In an audio reproduction device having a plurality of audio channel speakers, a first storage circuit that stores information regarding frequency characteristics suitable for audio of a music-based source and information regarding frequency characteristics suitable for audio of a conversation-based source; A second storage circuit that stores information, a selection circuit that switches between the first storage circuit and the second storage circuit, and an equalizer circuit that corrects the frequency of the audio signal based on the information regarding the frequency characteristics. An audio playback device characterized by: