JPH06177686A - Sound reproduction device - Google Patents

Abstract

PURPOSE:To reproduce a sound by correcting automatically a sound volume change in the case of performing sound quality adjustment. CONSTITUTION:A broadcast wave is received by an antenna 4 and a sound signal is extracted by a decoder 5. A listener 7 according its preference selects an amplitude frequency characteristic stored in advance in a storage circuit 10 with a remote control switch 2 depending on a king of the broadcast wave (e.g. a drama in which voice signals are of major concern and a music program). A control circuit 13 controls the storage circuit 10 according to a command of the remote control switch 2 to set amplitude frequency characteristic data and sound volume data in which sound volume is constant even when the amplitude frequency characteristic is selected to a digital filter 11 and a sound volume adjustment circuit 12. Thus, even when the listener 7 adjusts the desired sound quality depending on the kind of the broadcast wave, the sound volume of the sound listened to by the listener 7 is obtained from a speaker 6 similarly to the case before the adjustment of sound quality and it is not required to adjust the sound quality again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device for adjusting the sound quality of a sound signal in a stereo, a television or the like.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a configuration of a conventional sound reproducing device in a television. In FIG. 5, reference numeral 1 is usually called tone control or bass / treble, and a filter composed of an operational amplifier or a dedicated IC that realizes characteristics such that the amplitude frequency characteristic fluctuates in the low range or the high range, and 2 is a sound quality from the outside. , A CPU for controlling the filter 1 so that the amplitude-frequency characteristic of a certain pattern designated by the remote control switch 2 is obtained, and 4 is an antenna for receiving broadcast waves,
Reference numeral 5 is a decoder for extracting an acoustic signal from the received broadcast wave, 6 is a speaker for radiating the input acoustic signal as sound to the outside, and 7 is a viewer. Note that the monitor for reproducing the image is omitted in the figure (the same applies hereinafter).

FIG. 6 is a diagram showing the amplitude frequency characteristics in the filter 1 shown in FIG. 5, in which the vertical axis represents the amplitude and the horizontal axis represents the frequency. S1 is the low frequency band raised and S2 is the low frequency band. The lower range, S3 is the higher range, and S4 is the lower range.

The operation of the sound reproducing apparatus configured as above will be described with reference to the drawings.

First, in the configuration of FIG. 5, a broadcast wave is received by the antenna 4 and an acoustic signal is extracted by the decoder 5. The extracted sound signal is adjusted in sound quality via the filter 1 and is radiated as sound to the outside by the speaker 6. At this time, the viewer 7 switches the remote control switch 2 according to the type of broadcast wave, and the CPU 3 controls the filter 1 so that the pattern of the amplitude frequency characteristic as shown in FIG. .

[0006]

However, in the above configuration, when the sound quality is adjusted, the frequency of the signal rises and falls in the low range and the high range as shown in FIG. 6, so that the overall volume changes. Therefore, if the user wants to listen at a fixed volume when performing sound quality adjustment, it is necessary to also adjust the overall volume depending on how the sound quality is adjusted. There is also a problem that the viewer needs to operate the remote control switch according to the type of broadcast wave to adjust the sound quality.

The present invention has been made in view of the above problems. At the same time as adjusting the sound quality, the sound volume control that guarantees the overall sound volume is performed simultaneously, and the sound quality adjustment and the sound volume adjustment are performed by automatically determining the type of the acoustic signal. It is an object of the present invention to provide a sound reproducing device that simultaneously performs.

[0008]

In order to achieve this object, the sound reproducing apparatus of the present invention comprises an input means for inputting an audio signal, a sound quality adjusting means for adjusting frequency characteristics, and an overall volume of the audio signal. And a sound volume adjusting means.

[0009]

According to the present invention, the sound signal whose sound quality has been adjusted by the sound quality adjusting means can be automatically adjusted by the sound volume adjusting means so that the entire sound volume can be heard as it was before the sound quality adjustment.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a sound reproducing apparatus according to the first embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a pattern of a certain limited amplitude frequency characteristic, the case where the signal is adjusted so as to have this amplitude frequency characteristic, and the volume which the viewer 7 feels when the adjustment is not performed is constant. A storage circuit 11 for storing such volume data as a set receives a pattern of amplitude frequency characteristics set from the storage circuit 10 and adjusts sound quality of the input acoustic signal by the amplitude frequency characteristics DSP (Digital Signa).
a digital filter (sound quality adjustment circuit) composed of an LSI such as a processor, 12 is a volume adjustment circuit that receives volume data set by the storage circuit 10 and adjusts the volume of an acoustic signal, and 13 is a remote control switch 2. A control circuit for setting the amplitude frequency characteristic of a specified pattern in the digital filter 11 and controlling the memory circuit 10 so as to set the volume data stored in combination with the amplitude frequency characteristic in the volume adjusting circuit 12. Is.

Other components having the same functions as those shown in FIG. 5 are designated by the same reference numerals.

The operation of this embodiment will be described with reference to FIG.

First, the broadcast wave is received by the antenna 4, and the decoder 5 extracts an acoustic signal. At this time, in the digital filter 11, the storage circuit 10 is controlled in advance by the control circuit 13 and a certain amplitude frequency characteristic is set.

The acoustic signal extracted by the decoder 5 is input to the digital filter 11, and the sound quality is adjusted in the digital filter 11 so as to have the amplitude frequency characteristic set therein. Next, the output signal of the digital filter 11 is input to the volume adjusting circuit 12. This volume control circuit 12
The volume corresponding to the amplitude frequency characteristic preset in the digital filter 11 is set in the memory circuit 10 by a command from the control circuit 13. Therefore, the output signal of the volume adjusting circuit 12 is corrected so that the volume of the entire signal due to the amplitude frequency characteristic is felt to be the same as that when the amplitude frequency characteristic is not adjusted, and is output as a sound to the outside through the speaker 6. Then, the viewer 7 listens.

The viewer 7 selects the amplitude frequency characteristic stored in the storage circuit 10 in advance by the remote controller switch 2 according to his / her preference depending on the type of broadcast wave (for example, a drama or a music program in which audio is mainly used). Control circuit 13
Controls the memory circuit 10 in accordance with the instruction of the remote control switch 2, and sets amplitude frequency characteristic data and volume data which makes the volume constant even with this amplitude frequency characteristic in the digital filter 11 and the volume adjusting circuit 12. As a result, even when the sound quality desired by the viewer 7 is adjusted depending on the type of broadcast wave, the volume of the sound heard by the viewer 7 is heard as before the sound quality is adjusted, and there is no need to readjust the sound volume.

FIG. 2 is a block diagram showing the structure of an audio reproducing apparatus according to the second embodiment of the present invention.

In FIG. 2, 14 is amplitude frequency characteristic data suitable for voice signals and non-voice signals (music signals, etc.),
When the signal is adjusted to have this amplitude frequency characteristic,
A storage circuit that stores volume data so that the volume that the viewer 7 feels when the adjustment is not performed is constant,
15 extracts the silent section of the input acoustic signal (time interval when the acoustic signal becomes smaller than a certain amplitude level), thereby determining whether the input signal is a voice signal or a non-voice signal,
From this result, the control circuit controls the storage circuit 14 so as to set the optimum amplitude frequency characteristic data and volume data for the signal.

In addition, those having the same functions as those shown in FIGS. 1 and 5 are designated by the same reference numerals.

The operation of this embodiment will be described with reference to FIG.

First, a broadcast wave is received by the antenna 4, an audio signal is extracted by the decoder 5 and input to the control circuit 15. In the control circuit 15, the silent section of the input signal is extracted, and if the occurrence frequency of this silent section within a certain time is more than a certain number of times, it is determined that the input acoustic signal is a voice signal, and If it is not, it is determined to be a non-voice signal (for example, a music signal), and the amplitude frequency characteristic data optimized for the voice signal or the non-voice signal is controlled in the storage circuit 14 and set in the digital filter 11 (sound quality adjustment circuit).

At the same time, the volume control circuit 12 receives the volume data stored in combination with the amplitude frequency characteristic data.
Set to.

FIG. 3 is a schematic diagram for explaining a silent section of an acoustic signal. In FIG. 3, the vertical axis represents amplitude, the horizontal axis represents time,
S is an acoustic signal and indicates an envelope. In addition, A indicates a certain amplitude level, T is a time interval for examining the occurrence frequency of the silent section (experimentally, it is known that about 2 seconds is appropriate), and t is the length of the silent section. The time interval and the numerical value for the purpose of illustration indicate the number of times the length of the silent section is counted at t time intervals.

Here, the silent section is set to a level smaller than the amplitude level of A, and the number of occurrences of this section in T is counted every t hours. If this count value is larger than a certain number, it is considered as a voice signal, and if not, it is considered as a non-voice signal. This is because a person always breathes when he / she has a conversation, and thus utilizes a phenomenon that a sound signal always occurs within a certain period of time.

However, since the broadcast wave may be a signal containing only audio such as news or a mixture of audio in a drama and BGM signal, an amplitude level of A is set to make the signal level completely. It is possible to make a judgment as an audio signal, including the case where it does not become zero. Further, by changing the amplitude level of A, it is possible to arbitrarily change the judgment standard of the audio signal and the non-audio signal.

The digital filter 11 shown in FIG. 2 adjusts the sound quality of the input signal so that the amplitude frequency characteristic set therein is obtained. Next, the output signal of the digital filter 11 is input to the volume adjusting circuit 12. In the volume adjusting circuit 12, since the volume corresponding to the amplitude frequency characteristic set in the digital filter 11 is set from the storage circuit 14, the output signal of this is the volume of the entire signal based on the amplitude frequency characteristic. Is adjusted so that the sound volume is the same as when the adjustment is not performed, and the sound is output to the outside through the speaker 6. By the above operation, the type of broadcast wave is automatically selected, and the sound quality adjustment and the volume adjustment are automatically performed according to the selection.

FIG. 4 is a block diagram showing the structure of an audio reproducing apparatus according to the third embodiment of the present invention.

In FIG. 4, 16 is amplitude frequency characteristic data suitable for voice signals and non-voice signals (music signals, etc.),
When the signal is adjusted to have this amplitude frequency characteristic,
A storage circuit that stores the sound data in a stepwise manner so that the sound volume data is such that the sound volume that the viewer 7 feels when there is no adjustment is final, and 17 is a silent section of the input sound signal. (The time interval when the acoustic signal becomes smaller than a certain amplitude level) is extracted, and whether the input signal is a voice signal or a non-voice signal is determined by this, and from this result the optimum amplitude frequency characteristic data and volume data are obtained. Is a control circuit for controlling the memory circuit 16 so as to be set stepwise within a certain time.

Other components having the same functions as those shown in FIGS. 1 and 5 are designated by the same reference numerals.

The operation of this embodiment will be described with reference to FIG.

First, a broadcast wave is received by the antenna 4, an audio signal is extracted by the decoder 5 and input to the control circuit 17. The control circuit 17 extracts a silent section of the input signal, determines that the input acoustic signal is a voice signal if the frequency of occurrence of this silent section within a certain time is more than a certain number of times, and does not In this case, it is determined that the signal is a non-voice signal (for example, a music signal), and the memory circuit 16 is controlled to set the amplitude frequency characteristic data that is optimum for the voice signal or the non-voice signal in the digital filter 11.

At the same time, the volume data stored in combination with the amplitude frequency characteristic data is adjusted to the volume adjusting circuit 12.
Set to.

At this time, each data set in the digital filter 11 and the volume adjusting circuit 12 is stepwise and at a certain time interval so as to finally obtain the optimum amplitude frequency characteristic and volume.

For example, F1 to F10 are amplitude frequency characteristics stored in the storage circuit 16, F1 is an optimum amplitude frequency characteristic for a voice signal, F10 is an optimum amplitude frequency characteristic for a non-voice signal, and L1 to L10 are stored. In the volume data stored in the circuit 16, it is assumed that F1 and L1, F2 and L2 to F10 and L10 are stored as a set.

When the control circuit 17 determines that the input signal is a voice signal (at this time, the digital filter 1
The amplitude frequency characteristic F10 for the non-voice signal is set to 1 and the volume data L10 is set to the volume adjusting circuit 12). First, the control circuit 17 sets F9 and L9 stored in the storage circuit 16. The data is set in the digital filter 11 and the volume adjusting circuit 12. And after a certain time, F8 and L8
Data is set in the digital filter 11 and the volume adjusting circuit 12. Such an operation is repeated until the data of F1 and L1 are obtained. However, the time from the time F10 to the time F1 (L10
To L1) or from F1 to F10 (L1 to L10), the viewer does not feel a sense of discomfort when an erroneous determination of voice or non-voice occurs. For example, if it takes 2 seconds to determine whether voice or non-voice, control is performed to change from F10 to F1 over 4 seconds.

In this way, when the voice changes from the non-voice to the voice or to the non-voice, the change of the amplitude frequency characteristic is only required to be F10 to F6 to F10 at intervals of 2 seconds, and a large change in the sound quality is not felt.

Similarly, the digital filter 11 adjusts the sound quality of the input signal so that the set amplitude frequency characteristic is obtained. Next, the output signal of the digital filter 11 is input to the volume adjusting circuit 12 to adjust the volume. Then, the sound is radiated to the outside through the speaker 6.

Although the acoustic signal decoded from the broadcast wave is treated as a monaural signal in the above-mentioned embodiment, the same applies to a stereo signal, and the digital filter and the volume adjusting circuit are configured to operate on each signal. Just do it. Further, in stereo, the control circuit for determining whether it is a voice or a non-voice is to add stereo signals once to make a monaural signal for determination.

[0040]

As described above, the sound reproducing apparatus of the present invention automatically adjusts the sound volume simultaneously with the sound quality adjustment when the sound quality is adjusted, so that the sound volume when the sound quality is not adjusted is adjusted. It is possible to eliminate the change of.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a sound reproducing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a sound reproducing device according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating a silent section in FIG.

FIG. 4 is a block diagram showing a configuration of a sound reproducing device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional sound reproducing device.

FIG. 6 is a diagram showing amplitude frequency characteristics in the filter of FIG.

[Explanation of symbols]

2 ... Remote control switch, 4 ... Antenna, 5 ... Decoder, 6 ... Speaker, 7 ... Viewer, 10, 14, 16 ... Memory circuit, 11 ... Digital filter, 12 ... Volume adjustment circuit, 13, 15, 17 ... Control circuit .

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akihisa Kawamura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Ryo Tagami 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Mikio Oda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. An input unit for inputting an acoustic signal, a sound quality adjusting unit for adjusting frequency characteristics of the acoustic signal input by the input unit, and an acoustic signal adjusted by the sound quality adjusting unit for inputting to the input unit. A sound reproducing device comprising a volume adjusting means for adjusting the overall volume so that a human feels the same volume when the generated acoustic signal is output as a sound to the outside. 2. The sound quality adjusting means adjusts the amplitude frequency characteristics of an input signal in a limited plurality of patterns,
2. The volume adjusting means interlocks with volume adjustment corresponding to the pattern of the sound quality adjusting means.
The sound reproduction device described. 3. An input means for inputting an acoustic signal, a determining means for determining whether the signal input by the input means is a voice signal or a non-voice signal, and adjusting an amplitude frequency characteristic corresponding to a result of the determining means. An audio reproducing apparatus comprising: a sound quality adjusting unit for performing sound quality adjustment; and a sound volume adjusting unit for performing sound volume adjustment in association with the adjustment of the amplitude frequency characteristic of the sound quality adjusting unit. 4. The sound quality adjusting means determines whether the input signal is a voice signal or a non-voice signal, and adjusts the amplitude frequency characteristic corresponding to the two by gradually changing it within a certain time interval. 4. The sound reproducing apparatus according to claim 3, wherein the volume adjusting means gradually adjusts the volume corresponding to the adjustment of the two amplitude frequency characteristics of the sound quality adjusting means.