JPS6382198A - Acoustic reproducer for television receiver - Google Patents

Abstract

PURPOSE:To improve the sound quality of an external speaker by correcting the frequency characteristic of an acoustic reproducer at the time of using the external speaker. CONSTITUTION:Which changeover switches 5a, 5b are connected to a position A (built-in speaker), changeover switches 6a, 6b are opened, and the frequency characteristic of a frequency characteristic changeover circuit comprising resistors R1, R2 and a capacitor C is as shown in a characteristic X where a low tone is emphasized. With the changeover switches 5a, 5b thrown to the position B (external speaker), the changeover switches 6a, 6b are closed, and at this time, the frequency characteristic of the frequency characteristic changeover circuit is shown in a characteristic Y. The switches 6a, 6b switching the frequency characteristic of control circuits 3a, 3b provided to the pre-stage of a power amplifier are operated in interlocking with the changeover switches 5a, 5b switching the built-in speaker and the external speaker to always obtain preferred sound quality in the listening sense independently of the characteristic of the selected speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sound reproduction device for a television receiver having external speaker connection terminals.

2. Description of the Related Art A conventional sound reproducing device for a television receiver will be described with reference to FIGS. 3 to 6.

As shown in FIG. 3, a sound reproduction method is used in which the speaker system 11 built into the television receiver 10 and the external speakers 12 connected to the external speaker connections 24 and -7 are switched. The configuration of the device is as shown in FIG.

That is, the audio multiplexed signal applied to the input terminal 21 is demodulated by the matrix circuit 24, and the volume and sound quality are controlled by the control circuit 26 for stereo audio, bilingual audio, etc., and then passed through the power amplifier 26 and then switched. When the changeover switch 27 is connected to the A side, the built-in speaker is driven, and when the changeover switch 27 is connected to the B side, the external speaker is driven.

Problems to be Solved by the Invention However, the sound reproducing apparatus having the configuration shown in FIG. 4 has the following problems.

FIG. 6 shows an example of the acoustic characteristics of the built-in speaker and the external speaker when measured in front of the television receiver. The characteristics of the built-in speaker, which constitutes a rear open speaker system, are as shown in FIG. 6, and the characteristics of the external speaker, which is a closed speaker system, are as shown in FIG. 6B.

3 Bae.

Since the built-in speaker system shown in FIG. 6 lacks bass, the sound reproducing device shown in FIG. 4 has a frequency characteristic as shown in FIG. 6 in which the bass is emphasized by the control circuit 26. Therefore, if you connect an external speaker 12 with the characteristics shown in FIG. 6B to a sound reproduction device with the frequency characteristics shown in FIG. This has the problem of producing undesirable sound quality.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a sound reproduction device that can improve the sound quality of an external speaker by correcting the frequency characteristics of the sound reproduction device when using the external speaker.

Means for Solving the Problems The present invention has a changeover switch for switching the output signals of - power amplifiers between a speaker built in the receiver and an external speaker terminal using a changeover switch. In conjunction with this, a switch for changing the frequency characteristics of a control circuit provided in front of the power amplifier is operated.

Function: With the above-described configuration, the present invention can obtain a sound quality that is favorable to the auditory sense by switching between the frequency characteristics when using the built-in speaker and the frequency characteristics when using the external speaker.

Embodiment Hereinafter, a sound reproducing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram of a sound reproduction device according to an embodiment of the present invention. FIG. 2a is a control circuit 3 shown in FIG. 1.
FIG. 2 is a circuit diagram showing an embodiment for switching the frequency characteristics of the circuit, and FIG. 2 is a frequency characteristic diagram of the circuit shown in FIG.

In FIG. 1, an audio multiplex signal applied to an input terminal 1 is demodulated by a matrix circuit 2, resulting in one stereo audio signal and two stereo audio signals.
Control circuits 3a and sb, which include a frequency characteristic switching circuit for Japanese audio, etc., control the volume.

The quality of the sound is controlled, passed through power amplifiers 4a and 4b, switched by switches 6a and 6b, and added to the built-in speakers and external speakers. At this time, the changeover switches ea and eb interlocked with the changeover switches 6a and 5b are the second
As shown in FIG. 1, it is connected to a part of the frequency characteristic switching circuit provided in the control circuits 3a and 3b.

Now, when the selector switches 5a, 5b are on the input side (built-in speaker), the selector switches 6a, 6t) are open, and at this time, the frequency characteristic switching circuit consisting of resistors R, , R2, and capacitor C The frequency characteristic of the oscilloscope is one in which the bass is emphasized, as indicated by X in Fig. 2.

Next, when the changeover switches 6a and 5b are on the B side (external speaker), the changeover switches 6a and eb are in the 1 "closed" position, and the characteristics of the frequency characteristic switching circuit at this time are as shown in Figure 2 (Y). become.

As described above, according to this embodiment, the switch that changes the frequency characteristics of the control circuit provided in the front stage of the power amplifier is operated in conjunction with the changeover switch that changes between the built-in speaker and the external speaker.

This makes it possible to always obtain audibly preferable sound quality regardless of the characteristics of the selected speaker.

Effects of the Invention As described above, the present invention is driven by a sound reproducing device that has frequency characteristics that are optimal for the acoustic characteristics of the speakers used, so it is possible to reproduce sound with optimal audible quality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an audio reproduction device for a television receiver according to an embodiment of the present invention. FIG. 2 a is a circuit diagram showing an embodiment of a frequency characteristic switching circuit. FIG. 3 is a front view showing the configuration of a television receiver, FIG. 4 is a block diagram of a conventional audio reproduction device, and FIG. 5 is a frequency characteristic diagram of FIG. FIG. 6 is a diagram of the same frequency characteristics. 1...Input terminal, 2...Matrix circuit, 3a. 3b...control circuit, 4&, 4b...
...Amplification circuit, 5a, 5b, 6a, 6b...Switch switch.

Claims (1)

[Claims] It has a changeover switch that switches the output signal of one power amplifier between a speaker built into the receiver and an external speaker terminal. A sound reproduction device for a television receiver, characterized in that it is configured to operate a switching switch.