JPH10136495A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress change of overall output sound pressure and change of a frequency characteristic which are caused by on/off of a center speaker with respect to a television receiver that has a center speaker. SOLUTION: When left and right sound signals are synthesized by a synthesizing circuit 14 and only an intermediate sound band is reproduced from a center speaker 6, left and right sound signals are synthesized for bass emphasis for left and right speakers and also a bass emphasizing circuit 13 which increases only a low area is switched on. When a sound signal is reproduced without using the speaker 6 to improve left and right separation rate, a bass increasing circuit 13 is turned off, a bass correction circuit 2 in which left and right are independent is increased and controlled, and further, a volume circuit 3 is controlled to increase volume because overall sound pressure falls. Thereby, left and right separation rate is improved and the change of a frequency characteristic and sound pressure is suppressed in a small way in comparison with when the speaker 6 is used and reproduction is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver for electronic equipment.

[0002]

2. Description of the Related Art Conventionally, in a television receiver provided with left and right speakers and a center speaker, on / off control of the center speaker output has been performed independently of the operation of other functions.

[0003]

Turning on / off the center speaker changes the overall output sound pressure and the degree of separation between left and right sounds, and the frequency depending on the type of reproduction band of the speaker unit used. There is a problem that the characteristics change.

[0004]

Means for Solving the Problems To solve the above problems, the volume and frequency characteristics of the audio circuit are changed in conjunction with the on / off of a part of the outputs of a plurality of speakers, so that the total output from the speakers is obtained. This makes it possible to minimize changes in sound pressure and frequency characteristics.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention changes the volume and frequency characteristics of an audio circuit in conjunction with the on / off of some outputs of a plurality of loudspeakers, and comprehensively controls the loudspeakers. It is characterized by suppressing a small change in output sound pressure and frequency characteristics, and has an effect of correcting a sound pressure, a degree of separation and a frequency characteristic changed by turning on / off a center speaker.

According to a second aspect of the present invention, there is provided a left and right speaker, a center speaker, a means for turning on / off a center speaker output, and a bass enhancement circuit for synthesizing left and right audio signals and enhancing only low frequencies. And means for turning on / off the bass enhancement circuit, and has the effect of correcting the sound pressure, the degree of separation, and the frequency characteristics that change when the center speaker is turned on / off.

According to a third aspect of the present invention, a left and right speaker, a center speaker, a means for turning on / off the center speaker output, a synthesizing circuit, and a left and right audio signal are synthesized to enhance only a low frequency band. A bass enhancement circuit, means for turning on / off the bass enhancement circuit, a bass compensation circuit having a different correction frequency from the bass enhancement circuit and capable of controlling each channel independently, and a means for controlling the bass compensation circuit.
It is composed of a volume circuit and means for controlling the volume circuit, and has the effect of correcting the sound pressure, the degree of separation, and the frequency characteristics that change when the center speaker is turned on / off.

According to a fourth aspect of the present invention, there is provided a left and right speaker, a center speaker, a means for turning on / off the center speaker output, a synthesizing circuit, and a left and right audio signal synthesized to enhance only low frequencies. A bass enhancement circuit, means for turning on / off the bass enhancement circuit, a bass compensation circuit having a different correction frequency from the bass enhancement circuit and capable of controlling each channel independently, and a means for controlling the bass compensation circuit.
A center speaker, comprising: a volume circuit; a unit for controlling the volume circuit; and a storage device that can change the correction amount of the bass correction circuit and the volume circuit and stores the set correction amount. It has the effect of being able to correct the sound pressure, the degree of separation, and the frequency characteristics that change with on / off.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A television receiver according to an embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram showing a television receiver according to the first and second aspects of the present invention.

In FIG. 1, reference numeral 14 denotes a synthesis circuit, 13 denotes a bass enhancement circuit, and 4 denotes an audio circuit.
5 is a left speaker, 6 is a center speaker,
Reference numeral 7 denotes a right speaker, and reference numerals 8, 9, and 10 denote mute circuits for turning on / off the speakers. A microcomputer 11 controls the bass enhancement circuit 1. Next, the operation of the constituent device will be described.

In the case where the center speaker 6 is a speaker for reproducing a low frequency range, when reproducing an audio signal using the left speaker 5, the center speaker 6, and the right speaker 7, the mute circuit 9 is turned off. The bass enhancement circuit 1 is turned off. FIG. 2A shows the frequency characteristics and the combined state at this time. When the audio signal is reproduced only by the left speaker 5 and the right speaker 7 without using the center speaker 6, the mute circuit 9 is turned on, and the output of the bass range is reduced.
By turning on 3, the change in the frequency characteristic can be suppressed to be smaller than when reproducing using the center speaker 6. 2 (b) and 2 (c) show the change in the frequency characteristics and the combined state.

(Embodiment 2) FIG. 3 is a block diagram showing a television receiver according to a third embodiment of the present invention.

In FIG. 3, reference numeral 14 denotes a synthesis circuit, 13 denotes a bass enhancement circuit, 2 denotes a bass correction circuit, 3 denotes a volume circuit, and 4 denotes an audio circuit. Reference numeral 11 denotes a microcomputer for controlling the bass enhancement circuit 1, bass compensation circuit 2, and volume circuit 3. Other configurations are the same as in the first embodiment. Next, the operation of the constituent device will be described.

When the left and right audio signals are synthesized by the synthesis circuit 14 and only the middle sound range is reproduced from the center speaker 6, the left speaker 5, the center speaker 6, and the right speaker 7
When the audio signal is reproduced by using, the bass enhancement circuit 13 for synthesizing the left and right audio signals and enhancing only the low frequency band is simultaneously turned on. FIG. 4A shows the frequency characteristics and the combined state at this time. When the audio signal is reproduced only by the left speaker 5 and the right speaker 7 without using the center speaker 6, the bass enhancement circuit 13 is turned off, and the bass correction that can enhance or attenuate the bass independently for the left, right, and center. The circuit 2 is reinforced and the overall sound pressure is reduced, so that the volume circuit 3 is controlled to increase the volume. FIG. 4B shows the frequency characteristics and the combined state at this time. As a result, it is possible to improve the degree of left and right separation as compared with the case where reproduction is performed using the center speaker 6, and suppress changes in frequency characteristics and sound pressure to be small.

(Embodiment 3) FIG. 5 is a block diagram of a television receiver according to a fourth embodiment of the present invention.

In FIG. 5, reference numeral 12 denotes a bass correction circuit 2.
This is a memory for storing the correction amount of and the increase / decrease value of the volume circuit 3. Other configurations are the same as in the first embodiment. Next, the operation of the constituent device will be described.

When the left and right audio signals are synthesized by the synthesizing circuit 14 and only the middle sound range is reproduced from the center speaker 6, when the sound is reproduced from the center speaker 6, the mute circuit 9 is turned off and the bass enhancement circuit 13 is turned on. .
When sound is reproduced without using the center speaker 6, the mute circuit 9 is turned on, the bass enhancement circuit 13 is turned off, and the bass correction circuit 2 capable of enhancing or attenuating bass independently for the left, right, and center is stored in the memory 12. , And the volume circuit 3 is controlled by the volume correction amount stored in the memory 12 to increase the volume. As a result, the degree of left and right separation can be improved, and changes in frequency characteristics and sound pressure can be reduced by adjustment, as compared to when reproduction is performed using the center speaker 6. The change in the frequency characteristics and the synthesis state are the same as those in FIG.

[0019]

As described above, according to the television receiver of the present invention, when a partial output of a plurality of speakers is controlled, a part or a plurality of functions of an audio circuit are operated in conjunction therewith. Thus, the change in frequency characteristics can be reduced and the overall sound pressure can be kept constant.

[Brief description of the drawings]

FIG. 1 is a block diagram of a television receiver according to a first embodiment of the present invention.

FIG. 2 is a frequency characteristic diagram of FIG. 1;

FIG. 3 is a block diagram of a television receiver according to a second embodiment of the present invention.

FIG. 4 is a frequency characteristic diagram of FIG. 3;

FIG. 5 is a block diagram of a television receiver according to a third embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bass enhancement circuit 2 bass compensation circuit 3 volume circuit 4 audio circuit 5 left speaker 6 center speaker 7 right speaker 8, 9, 10 mute circuit 11 microcomputer 12 memory 13 bass enhancement circuit 14 synthesis circuit

Claims (4)

[Claims] 1. A sound volume and frequency characteristic of an audio circuit are changed in conjunction with on / off of a partial output of a plurality of speakers,
A television receiver characterized by minimizing changes in overall output sound pressure and frequency characteristics from a speaker. 2. Left and right speakers, a center speaker,
Means for turning on / off the center speaker output, a bass enhancement circuit for synthesizing left and right audio signals and enhancing only low frequencies,
Means for turning on / off the bass enhancement circuit. 3. Left and right speakers, a center speaker,
Means for turning on / off the center speaker output, a bass enhancement circuit for synthesizing left and right audio signals and enhancing only low frequencies,
Means for turning on / off the bass enhancement circuit, a bass compensation circuit having a different correction frequency from the bass enhancement circuit and capable of controlling each channel independently, a means for controlling the bass compensation circuit, a volume circuit, A television receiver comprising: means for controlling a volume circuit. 4. Left and right speakers, a center speaker,
Means for turning on / off the center speaker output, a bass enhancement circuit for synthesizing left and right audio signals and enhancing only low frequencies,
Means for turning on / off the bass enhancement circuit, a bass compensation circuit having a different correction frequency from the bass enhancement circuit and capable of controlling each channel independently, a means for controlling the bass compensation circuit, a volume circuit, A television receiver comprising: means for controlling a sound volume circuit; and a storage device which can change the correction amount of the correction circuit and stores the set correction amount.