KR20000045184A - Stereo/mono mode switching device of sound signals in tv receiver and audio equipments - Google Patents

Abstract

PURPOSE: A stereo/mono mode switching device of sound signals in TV receiver and audio equipments is provided to be automatically switched between stereo and mono modes in accordance with the receipt state during viewing or listening. CONSTITUTION: A stereo/mono mode switching device of sound signals in TV receiver and audio equipments comprises an antenna(100), a tuner(102), a receiver(104), an IF demodulator(106), an audio processor(108), a speaker(110), a stereo mode driver(112), a mono mode driver(114), a switch(116), a stereo/mono mode switch(118), a counter(120), a signal level detector(122), a memory(124) and a controller(126). The controller(126) receives signals for channel selection from the receiver(104) to apply signals(Sf) for frequency selection corresponding to the selected channel to the tuner(102), receives switching times signals(Sn) from the counter(120), receives signal level value(Sl) from the detector(122) to calculate a reference level using the signals(Sn,Sl).

Description

Sound signal stereo / mono mode switching apparatus in television receiver and audio machine

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sound signal switching of television receivers and audio equipment, and more particularly, to stereo / mono mode switching apparatus for sound signals in television receivers and audio equipment.

When watching TV or listening to a broadcast using an audio device, the sound signal is generally set in the stereo mode to listen to the broadcast. At this time, when the broadcast reception condition deteriorates, the sound signal is set to the mono mode to listen. This is because mono mode can reduce noise in terms of sound effect than stereo mode but can reduce noise. However, when listening to a broadcast in stereo mode suddenly deteriorates the reception state is switched to mono mode manually. It is not possible to know whether the reception state is well recovered without the user switching the mode to the stereo mode in the manual mode to the mono mode.

An object of the present invention is to suddenly deteriorate while listening to a broadcast using a television receiver or an audio device to manually switch from stereo mode to mono mode and to detect a reception state when the reception state may be restored to a good state. To provide a device that can be automatically switched to the stereo mode when the reception condition is good.

An apparatus for achieving the above object is a television receiver and an audio device comprising: an antenna for receiving a broadcast signal; A tuner for frequency tuning among broadcast signals received from the antenna by a tune signal (Sf); A receiver for receiving a remote control signal or a front panel key signal for at least channel selection of a television receiver and an audio device; An intermediate frequency demodulator for demodulating the intermediate frequency output from the tuner; An audio processor configured to process an audio signal output from the intermediate frequency demodulator; speaker; A stereo mode driver configured to drive an input audio signal in a stereo mode and output the same to the speaker; A mono mode driver for driving the audio signal in a mono mode to output the speaker; A switching unit for switching the signal output from the audio processing unit to the stereo mode driving unit or the mono mode driving unit by a manual selection signal Sm or an automatic selection signal Sa; A stereo / mono mode switching unit for applying a manual selection signal Sm to the switching unit when manually switching the stereo mode / mono mode; A counter for outputting a switching frequency signal (Sn) by counting the switching frequency at which the manual selection signal (Sm) is output by the stereo / mono mode switching unit; A signal level detector for detecting a signal level output from the tuner and outputting a signal level value Sl; A storage unit for storing the switching frequency and the reference level; And receiving a signal for channel tuning received from the receiver, applying a tuning signal Sf for frequency tuning corresponding to a selected channel to the tuner, receiving a switching frequency signal Sn from the counter, and switching. The reference level is simultaneously received by the signal level value Sl applied from the signal level detector at the time when the count signal Sn is applied, and the reference level is calculated using the applied switching frequency signal Sn and the signal level value Sl. And applying the switching frequency according to the switching frequency signal Sn and the calculated reference level to the storage unit, and the signal level value Sl applied from the signal level detecting unit is greater than the reference level stored in the storage unit. When high, the switching unit applies an automatic selection signal Sa to the switching unit so that the signal output from the audio processing unit is connected to the stereo mode driving unit. It includes a control unit.

The control unit calculates a switching frequency signal Sn applied from the counter and a signal level value Sl referenced from the signal level detection unit.

L _{n + 1} = L _n- (L _n -L _p ) / n

(here, L _{n + 1} Is the updated reference level, L _n Is the previous reference level, L _p Is the signal level applied by the current signal level detection unit, n is the number of switching times).

1 is a block diagram of a stereo / mono mode switching device for sound signals in a television receiver and an audio device according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: antenna 102: tuner

104: receiver 106: intermediate frequency demodulator (IF demodulator)

108: audio processor 110: speaker

112: stereo mode driver 114: mono mode driver

116: switching unit 118: stereo / mono mode switching unit

120: counter 122: signal level detector

124: storage unit 126: control unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a stereo / mono mode switching device for sound signals in a television receiver and an audio device according to the present invention.

In a television receiver and an audio device as shown in FIG. 1, the stereo / mono mode switching device of the sound signal includes an antenna 100, a tuner 102, a receiver 104, an intermediate frequency demodulator (IF demodulator) 106 ), Audio processor 108, speaker 110, stereo mode driver 112, mono mode driver 114, switching unit 116, stereo / mono mode switching unit 118, counter 120, signal level The detector 122, the storage 124, and the controller 126 are configured to be included.

The mutual organic relationship according to the components of the stereo / mono mode switching device of the sound signal in the television receiver and the audio device according to the present invention will be described.

The antenna 100 receives a broadcast signal. The tuner 102 tunes frequencies among the broadcast signals received from the antenna 100 by the tune signal Sf. The receiver 104 receives a remote control signal or a front panel key signal for at least channel selection of a television receiver and an audio device. The intermediate frequency demodulator 106 demodulates the intermediate frequency output from the tuner 102. The audio processor 108 processes the audio signal output from the intermediate frequency demodulator 106. The speaker 110 outputs an audio signal. The stereo mode driver 112 drives the input audio signal in the stereo mode and outputs the audio signal to the speaker 110. The mono mode driver 114 drives the input audio signal in the mono mode and outputs the audio signal to the speaker 110. The switching unit 116 switches the signal output from the audio processing unit 108 to the stereo mode driving unit 112 or the mono mode driving unit 114 by the manual selection signal Sm or the automatic selection signal Sa. . The stereo / mono mode switching unit 118 applies a manual selection signal Sm to the switching unit 116 when the stereo mode / mono mode is manually switched. The counter 120 counts the switching frequency at which the manual selection signal Sm is output from the stereo / mono mode switching unit 118 and outputs a switching frequency signal Sn. The signal level detector 122 detects the signal level output from the tuner 102 and outputs a signal level value Sl. The storage unit 124 stores the switching frequency and the reference level. The control unit 126 receives the signal for channel selection received from the receiving unit 104, and applies the tuning signal Sf for frequency tuning corresponding to the selected channel to the tuner 102, and the counter 120 The switching frequency signal Sn is received from the signal level signal Sl applied from the signal level detecting unit 122 at the time when the switching frequency signal Sn is applied, and the switching frequency signal is applied. A reference level is calculated using Sn and a signal level value Sl, and the switching frequency according to the switching frequency signal Sn and the calculated reference level are applied to the storage unit 124 to store the calculated reference level. When the signal level value S1 applied from the detector 122 is higher than the reference level stored in the storage unit 124, the switching unit 116 outputs the signal output from the audio processor 108 to the stereo mode driver. 112) The automatic selection signal (Sa) applied to the switching unit 116. The

The operation according to the component of the stereo / mono mode switching device of the sound signal in the television receiver and the audio device according to the present invention will be described.

The present invention suddenly deteriorates while listening to a broadcast using a television receiver or an audio device, and manually switches from stereo mode to mono mode and detects and receives a reception state in a situation in which the reception state may be restored to a good state. When the condition is good, the device can automatically switch to stereo mode.

In order to automatically switch to the stereo mode, first, a signal level detector 122 is provided. The signal level detector 122 is located at the rear end of the tuner 102. Of course, the position of the signal level detector 122 is a suitable position where the level of the currently received signal can be known. Since this is easily understood by those skilled in the art, further detailed description is omitted. The signal level detector 122 applies the currently received signal level value Sl to the controller 126.

On the other hand, when a user receives a broadcast signal using a television receiver or an audio device and the signal reception state deteriorates, the user manually switches the mode through the stereo / mono mode switching unit 118. In most cases, since the signal reception state is set to the stereo mode in a good state, when the signal reception state deteriorates, the user will manually switch modes. When the user switches modes through the stereo / mono mode switching unit 118, the manual selection signal Sm is applied to the switching unit 116. The switching unit 116 connects the signal output from the audio processing unit 108 to the stereo mode driver 112, and then to the mono mode driver 114 when the manual selection signal Sm is applied. The user will now listen to the broadcast in mono mode. When the manual selection signal Sm is output from the stereo / mono mode switching unit 118, the counter 120 counts it and applies a switching frequency signal Sn to the control unit 126.

The control unit 126 calculates the reference level by receiving the switching frequency signal Sn from the counter 120 and the signal level value Sl from the signal level detection unit 122. The reference level is a continuously changing value. The reference level is calculated as follows.

Calculation of the reference level

L _{n + 1} = L _n- (L _n -L _p ) / n

here, L _{n + 1} Is the updated reference level, L _n Is the previous reference level, L _p Is the signal level applied by the current signal level detector and n is the switching frequency.

Therefore, the reference level keeps changing. The reason why the reference level is constantly changing is that if possible, it is the user's choice, that is, if the user normally receives this level, the statistical average level level, which manually switches from stereo mode to mono mode, should be adjusted according to the latest standard. It is.

The controller 126 calculates a reference level and stores the reference level in the storage unit 124. The reason for storing is to allow the previous value to continue to affect the current value as seen in the above formula. The control unit 126 stores the reference level in the storage unit 124 and continuously checks the current received reception level input from the signal level detection unit 122 and switches to switch to the stereo mode when the value is greater than the stored value. The automatic selection signal Sa is applied to the unit 116.

According to the stereo / mono mode switching device for sound signals in the television receiver and the audio device as described above, the reception state suddenly deteriorates while listening to broadcasts using the television receiver or the audio device, and thus the manual mode is switched from the stereo mode to the mono mode. When the reception state is good, the reception state is detected, and when the reception state is good, the user can automatically switch to the stereo mode, so that the user can listen to the broadcast in the good state if possible. to provide.

Claims (2)

In a television receiver and an audio device, An antenna 100 for receiving a broadcast signal; A tuner 102 for frequency tuning among broadcast signals received from the antenna 100 by a tune signal Sf; A receiver 104 for receiving a remote control signal or a front panel key signal for at least channel selection of a television receiver and an audio device; An intermediate frequency demodulator (106) for demodulating the intermediate frequency output from the tuner (102); An audio processor 108 processing an audio signal output from the intermediate frequency demodulator 106; Speaker 110; A stereo mode driver 112 driving the input audio signal in a stereo mode and outputting the audio signal to the speaker 110; A mono mode driving unit 114 driving the input audio signal in a mono mode and outputting the same to the speaker 110; A switching unit (116) for switching the signal output from the audio processing unit (108) to the stereo mode driving unit (112) or the mono mode driving unit (114) by a manual selection signal (Sm) or an automatic selection signal (Sa); A stereo / mono mode switching unit 118 for applying a manual selection signal Sm to the switching unit 116 when the stereo mode / mono mode is manually switched; A counter 120 for counting a switching frequency at which the manual selection signal Sm is output by the stereo / mono mode switching unit 118 and outputting a switching frequency signal Sn; A signal level detector 122 for detecting a signal level output from the tuner 102 and outputting a signal level value Sl; A storage unit 124 for storing the switching frequency and the reference level; And Receives a signal for channel selection received from the receiver 104, and applies a tuning signal Sf for frequency tuning corresponding to the selected channel to the tuner 102, and the switching frequency signal (from the counter 120) Sn is applied, and at the time when the switching frequency signal Sn is applied, the signal level value Sl applied from the signal level detection unit 122 is simultaneously applied to the applied switching frequency signal Sn and the signal. The reference level is calculated using the level value Sl, the switching frequency according to the switching frequency signal Sn and the calculated reference level are applied to be stored in the storage unit 124, and from the signal level detection unit 122 When the applied signal level value Sl is higher than the reference level stored in the storage unit 124, the switching unit 116 connects the signal output from the audio processing unit 108 to the stereo mode driver 112. Auto selection A stereo / mono mode switching device for sound signals in a television receiver and an audio device comprising a control unit (126) for applying an arc (Sa) to the switching unit (116). According to claim 1, The control unit 126 calculates the switching frequency signal (Sn) received from the counter 120 and the signal level value (Sl) reference level applied from the signal level detection unit 122, Calculation of the reference level L _{n + 1} = L _n- (L _n -L _p ) / n (here, L _{n + 1} Is the updated reference level, L _n Is the previous reference level, L _p Is the signal level applied by the current signal level detector, and n is the number of switching.) A stereo / mono mode switching device for sound signals in a television receiver and an audio device.