JPH05236389A - Tv receiver - Google Patents

Abstract

PURPOSE:To automatically perform an easy-to-hear speech-equalizing process corresponding to respective stereophonic, bilingual, and monaural modes, etc., by the TV receiver equipped with a speech signal processing part corresponding to the respective modes. CONSTITUTION:A speech mode-detecting means and a speech frequency characteristic-varying means are provided in the speech signal-processing part; and a speech mode-detecting means detects a new speech mode (F10) each time the speech mode of a reception channel changes and automatically varies the audio frequency characteristics of the speech frequency characteristic-varying means to perform a stereophonic process (F20) for the stereophonic mode, a monaural process (F30) for the monaural mode, or a bilingual process (F40) for the bilingual mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV receiver having an audio signal processing function corresponding to various receiving modes.

[0002]

2. Description of the Related Art Recently, the number of stereo programs, bilingual programs, and the like has increased considerably in recent television programs, and even in commercials, there are many stereo modes. For example, in stereo broadcasting, it is possible to improve dynamics by improving audio technology. It is becoming possible to enjoy powerful sound with a wide range and immersiveness. In addition, while watching a program that broadcasts live rock music, you can raise the bass level if you want to enjoy a powerful low tone, or raise the bass level if you want to enjoy high-pitched sound. It is also possible to raise the to set the voice according to the user's preference.

[0003]

[Problems to be Solved by the Invention] However, programs such as news and other bilingual broadcasts, simple mono-mode serial dramas, document programs, etc., which mainly consist of audio, have the same low-pitched and high-pitched levels as music programs. If you keep emphasizing, it will be rather harsh and will make hearing difficult. For this reason, when switching from a music program or the like to a drama or news program, it is troublesome to manually suppress the bass and treble levels.

[0004]

The present invention has been made to solve the above problems, and for example, an audio frequency band changing means and an audio mode detecting means are provided inside the audio signal processing means, The frequency characteristic and the band of the output voice are automatically changed according to the voice mode of the received radio wave.

[0005]

When the audio mode detecting means detects the audio mode of the receiving channel, for example, the stereo mode,
The frequency band variable means automatically changes the frequency characteristics of the output sound according to the stereo mode, so that it is possible to output an easy-to-listen sound that matches the mode even if the user does not control the bass or treble. You can

[0006]

1 is a block diagram of a TV receiver of the present invention, particularly an audio circuit. Reference numeral 1 is a TV tuner for selecting a received radio wave, 2 is an intermediate frequency amplifier, 3 is an audio signal processor, 4 is a controller for controlling the above circuits by attaching a control bus CB, and 5 is a volume, a sound quality, and an image quality. An operation unit provided with control keys, channel selection keys, etc., 6 is an infrared light receiving unit for receiving various control signals from a remote commander, and 7 is a demodulation unit. Broadcast channel is T
The channel is selected by the V tuner 1, the audio signal component is separated in the intermediate frequency amplification unit 2, and various signals are processed by the audio signal processing unit 3 via the switch S. Audio signals from external devices such as a video deck and an LD player are directly processed from the external input terminal via the switch S by the audio signal processing unit 3, and the audio signals amplified by the amplifier A are output from the speaker SP. .. The audio signal processing unit 3 has a function of performing digital signal processing for forming various sound effects such as a surround effect, in addition to increasing / decreasing a sound volume corresponding to an operation button of the operation unit 5. .. Circuits such as the video signal circuit system are omitted.

FIG. 2 is a diagram showing a part of the audio signal processing section 3. Reference numeral 3a is a mode detection circuit for detecting the mode of the input audio signal, and 3b is an equalizer for changing the audio frequency characteristic. The voice mode detection circuit 3a detects the identification code when the PCM code is modulated, and also detects the music information or only the human voice by detecting the voice band even in the case of monaural voice, and the control unit 4 Input the identification signal to. In this example, when an audio signal is input to the audio signal processing unit 3 via the TV tuner 1 and the intermediate frequency amplification unit 2, the mode detection circuit 3a provided inside the audio signal processing unit 3 is input. It is determined whether the audio signal is in the stereo mode, the bilingual mode, or the monaural mode. Then, the detection data is sent from the mode detection circuit 3a to the control unit 4, and the equalizer 3b is controlled to control the sound quality.

FIG. 3 is a flow chart showing the flow of processing at the time of equalizing processing. In the equalizer 3b, audio frequency characteristics corresponding to various audio modes are stored in memory and controlled by the control unit 4. When the data corresponds to, for example, the stereo mode (F10), the data corresponds to the stereo mode and is changed so that the bass and treble levels are emphasized (F2).
0), an equalizing process is performed so as to output a sound with a sound quality suitable for the stereo mode (F50). Also, when the audio mode of the program being viewed is changed from, for example, the stereo mode to the monaural mode (F10), the audio frequency characteristic is similarly changed to suppress, for example, bass and treble sound quality suitable for the monaural mode. It is possible to output a voice at (F30) (F50). further,
When the mode is changed to the bilingual mode (F10), the audio frequency characteristic can be changed, for example, the passing voice band can be narrowed (F40), and the voice can be output with the sound quality suitable for the bilingual mode (F5).
0).

In the past, it was possible to adjust the sound by operating the sound quality control keys such as bass and treble according to the taste, but the sound frequency band that can be adjusted by the key operation was fixed, so it was quite sketchy. It was
In the case of the present invention, the finely adjusted audio frequency characteristic is stored in the equalizer 3b so that, for example, when the voice changes to the stereo mode, there is a roundness effect to bring out a powerful sound correspondingly. The output is made by changing the audio frequency characteristics.In the case of bilingual mode or monaural mode, the human voice is often the focus in news programs and dramas. Select an audio frequency characteristic that cuts bass and treble to output voice.

As for the audio frequency characteristic corresponding to each voice mode, as shown in the flowchart of FIG. 4, the degree of the effect is divided into about 1 to 3 levels, and the degree of equalizing is manually operated by the user. Or select (F010-F020 or F0
30 to F040 or F050 to F060), and the strength of the audio frequency characteristic can be selected and set from among several types of patterns according to the user's preference.

Further, a manual switch is provided regardless of the voice mode detection circuit 3a so that the user does not perform the equalizing process in any voice mode or the equalizing process can be performed regardless of the voice mode. The equalizing mode may be selected.

[0012]

As described above, the TV receiver of the present invention controls the output audio frequency characteristic by controlling the audio mode detecting means for detecting the audio mode of the audio signal in the control section and the audio mode detecting means. Equipped with an equalizer that controls the audio frequency band, the audio signal is processed automatically each time the audio mode such as stereo, monaural, bilingual, etc. changes to facilitate listening. There is an effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a TV receiver that is an embodiment of the present invention.

FIG. 2 is a block diagram showing a part of an audio signal processing unit 3 of FIG.

FIG. 3 is a flowchart showing a flow of an equalizing process in this embodiment.

FIG. 4 is a flowchart showing the degree of equalizing processing in this embodiment.

[Explanation of symbols]

 3 audio signal processing unit 3a audio mode detection circuit 3b equalizer

Claims (1)

[Claims] 1. A voice mode detecting means for identifying a voice mode of a selected receiving channel, and a voice frequency characteristic changing means for controlling a voice frequency pass band by a detection signal of the voice mode detecting means are provided. A TV receiver comprising an audio circuit for controlling such that the passing frequency characteristic of the audio frequency characteristic varying means is automatically changed according to the characteristic of the audio signal of the receiving channel.