MXPA06008398A - Selectable audio output configuration - Google Patents

Abstract

An audio/video apparatus (10) such as a television apparatus includes two or more auxiliary audio inputs (AUX1, AUX2, and AUX3) for receiving respective audio signals, an audio output, and a switch arrangement (140, or 140 and 180) for selecting one of a broadcast audio signal and the auxiliary audio input signals. The audio/video apparatus (10) operates in two modes. In the first mode where the audio/video apparatus (10) is turned on, the svitch arrangement (140, or 140 and 180) selects one of the auxiliary audio input signals and a broadcast audio signal in response to a user command, and in the second mode where the audio/video apparatus (10) is turned off, the switch arrangement selects a pre-determined one of the auxiliary audio input signals.

Description

SELECTABLE AUDIO OUTPUT CONFIGURATION CROSS REFERENCE WITH RELATED APPLICATIONS This application claims the priority of and all benefits of the Provisional Application filed with the United States Patent and Trademark Office on January 23, 2004, and assigned with serial number 60 / 538,563 .

FIELD OF THE INVENTION The present invention relates in general to the selection of the audio output from one or more external audio inputs on an audio / video device, in particular, during a standby mode or in an off mode. of energy.

BACKGROUND OF THE INVENTION In a home environment, a user may connect various auxiliary audio / video devices, such as DVD players (digital versatile disc), transcoders, compact disc players (Compact Discs), MP3 players, and singing machines, to a main audio / video device, such as a television set, which is then connected to a hi-fi amplifier. In this way, all audio / video devices can share the same high fidelity amplifier. A disadvantage of the configuration described above is that the television set can select one of the audio input signals to be connected to the high fidelity amplifier when the television set is turned on, but does not have the ability to make such selection, when the television set is switched off or disconnected. In this way, even if the user wishes to listen to only the audio from one of the auxiliary audio / video devices without seeing the video, the user will have to carry out one of the following. First, the user will have to turn on the television set 10, but that represents energy expenditure, since the user will not watch the video. Secondly, the user must remove the audio output of the desired auxiliary audio / video device from the television set and reconnect the output with the high fidelity amplifier, but this is problematic since the user has to move the connecting cables back and forth. Finally, instead of connecting the audio outputs of the auxiliary audio / video devices with the television set, the user can connect the audio output of each of the auxiliary audio / video devices with an input of the audio amplifier. high fidelity, but that is not convenient since the outputs of the auxiliary audio / video device will have to go through two different devices: the audio with the high fidelity amplifier and the video with the television set, which complicates the arrangement of Connection. As such, there is a need to have a television set having the ability to connect one of the auxiliary audio inputs with the audio output of the television set, when the television set is turned off, but without significantly increasing the cost of the television set.

BRIEF DESCRIPTION OF THE INVENTION In accordance with one aspect of the present invention, an audio / video apparatus includes first and second audio inputs for receiving the respective first and second audio signals, an audio output and a switch arrangement for select one of the two audio inputs. The audio / video device operates in two modes. In the first mode, the switch arrangement selects one of the two inputs and a transmit audio signal in response to the user command, and in the second mode, the switch arrangement selects a predetermined of the two input audio signals . In the first mode, the audio / video apparatus is turned on, and in the second mode, the television set is turned off or disconnected. The audio / video device, in illustrative form, is a television set. Another embodiment of the invention is an audio / video system that includes an audio / video device as set forth above but with an audio input, and an audio amplifier is coupled with the output of the audio / video device, wherein in a first mode of operation, the switch arrangement selects one of the input audio signal and one transmit signal to be output in response to the user's request, and in the second mode of operation, the switch arrangement selects the input of audio BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and other features and advantages of the invention and the manner of achieving them will be apparent and the invention will be better understood by reference to the following description of the embodiments of the invention taken together with the accompanying drawings, wherein : Figure 1 is an exemplary audio / video system suitable for implementing the present invention. Figure 2 is an exemplary embodiment of the television set shown in Figure 1. Figure 3 is an exemplary embodiment of the second audio switch arrangement shown in Figure 2. Figure 4 is another exemplary embodiment of the second switch arrangement of audio shown in Figure 2. Figure 5 is another exemplary embodiment of the second audio switch arrangement shown in Figure 2; and Figure 6 is another exemplary embodiment of the television set shown in Figure 2, but without the second audio switch arrangement. The examples set forth herein illustrate preferred embodiments of the invention, and such examples should not be construed as limiting the scope of the invention in any way. The corresponding reference characters indicate corresponding parts through the different views. Although the drawings represent embodiments of the invention, the drawings are not necessarily to scale and certain features may be extended in order to better illustrate and explain the invention. The examples set forth herein illustrate preferred embodiments of the invention, and such examples should not be construed as limiting the scope of the invention in any way.

DETAILED DESCRIPTION OF THE INVENTION Figure 1 shows an example of an audio / video system 1 in accordance with the principles of the invention. The system 1 includes an audio / video device, without limitation, such as a television set 10, a high fidelity amplifier 15, a left speaker 190, a right speaker 195, and three auxiliary audio / video devices 11-13; a DVD player (Digital Versatile Disk), a transcoder 12 (STB), and an auxiliary audio / video device 13, which can be a singing machine. The television apparatus 10 includes three audio / video inputs: one (AUX1) from the DVD player 11, one (AUX2) from the transcoder 12, and the other (AUX3) from the auxiliary equipment 11. In addition, the television apparatus 10 also includes an antenna 14 for receiving an audio / video transmission signal, of which, the audio portion must be processed in conventional manner to produce a baseband audio signal that is acceptable for the hi-fi amplifier 15 The television apparatus 10 includes an audio output coupled with an input of the high fidelity amplifier 15, which outputs the left and right audio signals to activate the left and right horns 190, 195, respectively. Although three auxiliary audio / video inputs are shown, the television set 10 can have any number of audio / video inputs. The television apparatus 10 has two modes of operation, in the first mode of operation, the television apparatus 10 selects one of the audio signals from the audio / video apparatus 11-13 and the processed audio transmission signal, and it outputs the selected audio / video signals through the audio output in response to the user's command. The video signal, of course, is displayed on the display device, which may be integrated within the television set 10, as shown or on a separate device from the television set 10. The selected audio signal is then coupled with the high fidelity amplifier 15. In the following description, only the audio switch is described to highlight the situation where the user is interested in the audio. In accordance with the principles of the present invention, the second mode of operation, the television set selects a predefined of the audio inputs from the audio / video apparatus 11-13, regardless of the commands entered by the user. Illustratively, the first mode of operation is the mode, wherein the television set 10 is turned on, and the second mode of operation is the mode in which the television set 10 has been turned off. When the television set is turned on, all the circuitry in the television set 10 derives the energy from a main power supply. When the television set is turned off, the television set 10 can still be connected to an external power source. In that case, even if the main power supply is not available, a standby power is available for the processor of the television set 10, so that the processor can detect an alternate on or off control signal, and turn on the apparatus 10. television in response to the user's command. However, the standby power is not available for other circuitry in the television set 10. When the television set is turned off and disconnected from the external main supply, both the main power and the standby power are no longer available for all the circuitry in the television set 10. For simplicity, the main power supply, the standby power supply, the external power source and the processor are not shown in Figure 1. In accordance with the principles of the invention, in the second mode of operation, either whether the standby power is available or not, the television apparatus 10 selects a predetermined one of the audio signals from the audio / video apparatus 11-13 to be output to a high fidelity amplifier 15. Figure 2 shows an illustrative embodiment of the television apparatus 10 shown in Figure 1. The television apparatus 10 includes a controller 100 for receiving the control signals input by the user from a local keyboard 105 or from an infrared receiver 110 (IR ). The IR receiver 110 receives and decodes remote control signals transmitted by the remote control unit 115. The controller 100, which may be a microprocessor or a microcomputer, causes the television tuner 120 to select a particular RF signal to be tuned in response to the data entered by the user. The tuner 120 produces a signal at an intermediate frequency (IF) and applies it to the processing unit 125 comprising a first section 125a including an image amplification stage (PIX) and a video detector, and a second section 125b which includes, a second stage of sound amplification, an audio detector and a stereo decoder. The processing unit 125 produces a baseband video (TV) signal and the left and right baseband audio signals. The baseband video signal (TV) is coupled through line 126 with an input of a four-input video switch 130. The right and left baseband audio signals are applied to a pair of inputs of an audio switch 140 with the ability to select a pair of inputs of four pairs of audio inputs. The video switch 130 and the audio switch 140 each have three other inputs labeled AUX1, AUX2 and AUX3, to receive the respective baseband audio and video signals from external sources. Each of the inputs of the video switch 130 and the audio switch 140 can be selected in response to binary signals generated by the controller 100 and applied to the control inputs C1 and Co through the leads 131 and 132, respectively. For example, when C-i and C0 are triggered to be at a low signal level (ie, binary 00), then the TV input is selected. When C-i is low and Co is high (binary 01), then AUX1 is selected. When Ci is high and C0 is low (binary 10), then AUX2 is selected. When C-i and Co are high (binary 11), then AUX3 is selected. The selection of the corresponding video and audio signals is ensured since the control lines 231 and 232 are coupled with the respective control inputs C-i and C0 of both video switches 130 and the audio switch 140. The selected video signal is applied to a comb filter unit 150, which separates the luminescence (Y) signals and the chrominance signals (C) to be applied to a video processing unit 160 for final display on a screen of deployment of a deployment device 170. The selected audio signals are applied to a second audio switch array 180. The second audio switch array 180 illustratively includes four inputs: one from the output of the audio switch 140, and the other three, respectively, from AUX1, AUX2 and AUX3. The switch arrangement 180 selects one of the four inputs and the selected audio signal is finally reproduced through the horns 190 and 195 via the high fidelity amplifier 15 (not shown in Figure 2). The selected audio signal can also be coupled with internal speakers (not shown). Although the three inputs of AUX1, AUX2 and AUX3 are shown coupled with the second switch arrangement 180, other arrangements are possible. For example, a manufacturer may choose to couple only one or two of the three auxiliary audio inputs with the second audio array 180, to save costs and other purposes. The television apparatus 10 also includes a main power supply 101 for supplying main power and a standby power supply 102 for supplying standby power, both energies derived from an external power source (not shown), such as a power source. AC power of 110 volts. The main energy is available for all the circuits in the television set 10. The standby power is available for a few circuits in the television set 10, such as the controller 100 and the IR receiver 110, to save energy. To simplify the connection of the main power with other circuitry in the television apparatus 10, it is not shown in Figure 2. In the first mode of operation, the main power and standby power supplies provide the operating energy. The main power is available for all the components in the television set 10. In the second mode of operation, when an external power supply remains available, although the main power supply 101 does not generate the main power, the standby power supply 102 must continue to supply the standby power. However, standby power is only available for the controller 100 and for the IR receiver 110, so that the controller 100 can detect an alternate power or power control signal from the remote control unit 115 or from the keyboard 105, and turn on a switch (not shown) to connect the main power supply 101 to the external source, in effect, turn on the television set 10, Standby power is not available for the audio switch 140 and other circuitry . The audio switch 140 is a switch that does not have the ability to connect an input to an output when the operating power is not available. For example, the audio switch 140 may be an electronic switch, including for example, CMOS transistors, such as part CD4066 manufactured by Texas Instruments. Without operational power, an electronic switch will not have the ability to connect an input with an output. When the external energy is not available (for example, the television set 10 is disconnected), both energies, the main and the standby are not available, and the audio switch 140 also does not have the ability to connect an input signal with its output. As such, in the second mode of operation, the audio switch 140 can not connect an input to an output. However, since one or more AUX1, AUX2 and AUX3 inputs are coupled with the inputs of the second audio switch array 180, one of the signals from AUX1, AUX2 and AUX3 is selected, even when the main power and / or The waiting energy are not available, in accordance with the principles of the invention. Figure 3 illustrates one embodiment of a second audio switch array 180, which includes an electromechanical switch 310, illustratively a solenoid or a relay. The electromechanical switch 310 includes a solenoid 316, which when charged, connects an input terminal 312 with an output terminal 311, and when discharged, connects an input terminal 313 with the output terminal 311. The input terminal 312, the input terminal 313 and the output terminal 311 are coupled, illustratively with the output of the audio switch 140, the AUX1 input and an input of the high fidelity amplifier 15.

The solenoid 315 receives the operating energy from the main power supply 101, where a resistor 310 and a diode 302 are added to protect the electromechanical switch 310 and the main power supply 101. Resistor 301 symbolizes the residual load of the apparatus. In operation, when the main power supply 101 is operating, that is, in the first operating mode, the solenoid 315 is charged, which forces the electromechanical switch 310 to connect the input terminal 312 and the output terminal 311, which, in fact, connects the audio signal from the audio switch 140 to the high fidelity amplifier 15. When the main power supply is not operating, that is, in the second mode, the solenoid is not charged and the switch 310 connects the input terminal 313 to the output terminal 311, which connects the audio signal from the AUX1 input with the high fidelity amplifier 15 even when the television set is in the standby mode, where the standby power is available or in an off mode, where there is no standby power available, for example, when the television set 10 is disconnected. Although AUX1 is coupled in an illustrative manner with the second array 180 of the switch, any of the AUX inputs may be selected for coupling with the second audio switch array 180. Figure 4 illustrates another embodiment of the second array 180 of the audio switch, which can achieve the same effect as that shown in Figure 3, when the standby power supply 102 is operating. In this mode, a solid-state switch 410 is used, but other electronic switches can be used. An example of a solid-state switch that can be used in this embodiment is a 2: 1 analog multiplexer, for example, part SN74AUC2G53 from Texas Instruments, Dallas, Texas, USA. This type of solid state switches have an operational power input and a control input. It may also include an inhibiting input, which must be adjusted low in a normal operating condition. By responding to the high and low signal levels provided to the control input, the switch 410 respectively connects the input terminal 412 and the output terminal 413 with the output terminal 411. However, when the operating energy is not available for the input of operational power, the switch 410 does not connect a method to the output terminal 411. In this embodiment, both supplies, the main and standby power supplies 101 and 102 provide power to the operating energy input of the switch 410 through the respective diodes 403 and 404. The diodes 403 and 404 prevent the current from flowing back to the auxiliary main and standby supplies 101 and 102 to protect these two supplies. The main power supply 101 also supplies a control signal to the control input of the switch 410. The down-pull resistor 406 is responsible for providing a defined low signal level when the main power supply is turned off. When the main power supply 101 has a low impedance control signal output, the pull down resistor is not necessary. In operation, when the main power supply 101 and the standby power supply 102 are operating, i.e., in the first mode, the switch arrangement 180 connects the output of! 140 audio switch with a high fidelity amplifier 15 input. When the main power supply 101 is not operating, that is, in the second mode, but the standby power supply 102 operates, the switch arrangement 180 connects the audio signal from the AUX1 input to an input of the amplifier 15. hi-fi. However, when both, the main power supply 101 and the standby power supply 102 do not operate, the switch arrangement 180 does not connect any input audio signal with the high fidelity amplifier 15. In this way, when a user turns off the television set 10 and leaves the television set 10 connected, the user can enjoy the audio feature from a cable of the three auxiliary audio inputs, but when the user disconnects the external source of power of the television set 10, the user will not be able to hear the audio from the pre-wired audio auxiliary input. Figure 5 illustrates another embodiment of the second switch arrangement 180, where all the auxiliary inputs are coupled with the switch arrangement 180. The switch arrangement 180 in this embodiment includes four switches 510, 520, 530 and 540, each with an output terminal coupled to an input of the high fidelity amplifier 15, and has an input terminal. The input terminals of the four switches are respectively coupled with the output of the audio switch 140, AUX1, AUX2 and AUX3. The four switches receive the necessary power from a switch control 505, which also receives the switch control signals Co and C-i from the controller 100, and the energy of the main power supply 101 and the standby power supply 102. Instead of sharing the same signals C0 and Ci of switch control with the audio switch 140, the second switch arrangement 180 can be controlled with a separate set of control signals from the controller 100 or from another controller (not shown) . During operation, when the main power is available, the switch control 505 supplies the power needed to close the switch 510, but does not energize the other three switches, regardless of the status of the C0 and Ci control signals, which leaves to the other three switches in a closed position. As a result, the switch arrangement 180 is connected to the output from the audio switch 140 with an input terminal of the high fidelity amplifier 15. When the main power is not available, but the standby power if available, the switch control supplies the necessary power to one of the four switches in accordance with the state of the control signals C0 and Ci. For example, when Ci and C0 are triggered to be at a low signal level (ie, binary 00), then the switch control 505 supplies power to the switch 510, which connects the output of the audio switch 140 with the amplifier 15 high fidelity. Of course, in this case, there is no audio signal coming from the output of the audlo switch 140, since the main power is not available to operate the audio switch 140. When Ci is low and C0 high (binary 01), then the switch control 505 supplies power to operate the switch 520 connecting AUX1 with the high fidelity amplifier 15. When Ci is high and Co is low (binary 10), then the switch control 505 supplies power to operate the switch 530 connecting AUX2 with the high fidelity amplifier 15. When both Ci and C0 are high (binary 11), then switch control 505 supplies power to operate switch 540, which connects AUX3 with high fidelity amplifier 15. The switch control 505 can be implemented, in illustrative form, with the use of digital logic, for example, with the use of a programmable field logic array. It should be noted that if the main power and standby power are not available and when the solid state switches are used, as shown in Figure 4, the Switch array 180 does not connect any input signal to the amplifier 15 of high Fidelity. In this mode, an exemplary electronic switch package can be used, such as the CD4066 CMOS square bilateral switch manufactured by Texas Instruments, Dallas, Texas, USA. However, when electromechanical switches are used as shown in Figure 3, a predefined one of the four switches may be in a closed position and the other three in an open position when both supply and main energies are not available. The desired input to be selected when the main power is not available can be stored in a non-volatile memory, such as a read-only, programmable, electrically erasable memory (EEPROM). When the processor detects that the television set 10 is in the second mode, the processor 100 also recovers the memory settings and generates the control signals necessary to close the corresponding switch. The settings can be made at the factory and saved in the memory. The settings can be fixed and can not be changed by the user or the user can change them through a user interface such as an on-screen display (OSD) menu with the use of a remote unit 115, or a local keyboard 105. Alternatively, the controller 100 simply receives the control commands from the remote control unit 100 or the local keyboard 105 to dynamically select the audio input desired by the user. All the examples described above have a common advantage, the television set 10 is similar to a conventional television set, except that the second audio switch array 180 and the associated interface circuits are added. As such, existing circuits in a television set do not have to be modified. When modification of the existing circuits is not a concern, the second audio switch array 180 can be eliminated, simply by supplying the standby power to the audio switch 140, so that the audio switch 140 can operate when the main power not available.

An example of such an arrangement is shown in Figure 6, wherein the audio switch 140, like the processor 100 (shown as a microprocessor), receives the main energy and standby power. As shown in Figure 6, an EEPROM 103 is used to predefine which audio input will be selected when the main power is not available, as described above. The AUX1, AUX2 and AUX3 inputs are connected illustratively with a DVD player; a transcoder, and an auxiliary audio / video apparatus in Figure 6. In this embodiment, the audio switch 140 may use a switch arrangement similar to that shown in Figure 5. As described herein, the present invention provides an apparatus audio / video that has an audio switch arrangement that can connect an audio input with an audio output from the audio / video device, even when the audio / video device is in a standby mode or has the power supply external energy disconnected. The audio / video apparatus is illustratively a television apparatus having a display, but can be applied to a television set without an integrated display, but having an auxiliary audio input and a tuner to receive a transmission signal, or two or more auxiliary audio inputs, such as transcoders, video cartridge recorders (VCRs), DVD players, video game boxes, personal video recorders (PVR), computers, or other devices that may not include an integrated display device .

While this invention has been described with a preferred design, the present invention can also be modified within the spirit and scope of this description. Therefore, the application is intended to cover any variation, use or adaptation of the invention, with the use of its general principles. Also, this application is intended to encompass such sections of the present invention as fall within the known or customary practice to which the invention pertains and which fall within the limits of the appended claims.

Claims (21)

1. An audio / video apparatus (10) having first and second modes of operation, the apparatus (10) is characterized in that it comprises: first (AUX1) and second (AUX2) audio inputs for receiving first and second audio signals; an arrangement (140 or 140 and 180) of a switch for sting one of the first audio signal, the second audio signal and an audio transmission signal; and an audio output for outputting the sted audio signal, wherein: in the first operating mode, the switch arrangement (140 or 140 and 180) sts one of the first audio signal, the second audio signal and the second audio signal. audio transmission signal in response to user command, and in the second operating mode, the switch arrangement is set by default to a predetermined position to st one of the first and second audio signals.

The audio / video apparatus (10) according to claim 1, characterized in that in the first mode of operation, the audio / video device (10) is turned on and in the second operating mode the apparatus (10) audio / video goes off.

3. The audio / video apparatus (10) according to claim 2, characterized in that the audio / video device (10) is turned off, a standby power supplied by a power supply (102) is available for the apparatus (10) audio / video, and when the audio / video device (10) is turned on, a main power supplied by a main power supply (101) and the standby power are both available for the apparatus (10) audio / video.

The audio / video apparatus (10) according to claim 3, characterized in that it also comprises a controller (100) wherein the controller (100) operates with the use of standby power when the apparatus (10) of audio / video has been turned off, and the controller (100) turns on the audio / video device (10) in response to the user's command.

The audio / video apparatus (10) according to claim 4, characterized in that the switch arrangement (140 or 140 and 180) does not respond to user commands when the apparatus (10) has been turned off.

6. The audio / video apparatus (10) according to claim 4, characterized in that the switch arrangement (140 or 140 and 180) does not receive the standby power when the apparatus (10) has been turned off.

The audio / video apparatus (10) according to claim 6, characterized in that the switch arrangement (140 or 140 and 180) comprises transistors.

The audio / video apparatus (10) according to claim 4, characterized in that the switch arrangement (140 or 140 and 180) comprises an tronic switch (140) for sting one of the first input audio signal, the second audio signal, and the audio transmission signal and a second switch (180) having a first input terminal coupled with an output of the tronic Switch (140), a second terminal coupled with one of the first (AUX1) and the second (AUX2) audio inputs, and an output terminal coupled with the audio output, wherein when the audio / video apparatus (10) is turned on at the output terminal of the second switch (180), it is coupled with the first terminal and when the audio / video apparatus (10) does not turn on, the output terminal of the second switch (180) is coupled with the second terminal.

The audio / video apparatus (10) according to claim 8, characterized in that the second switch (180) is a solenoid switch (310) energized by the main power, but not by the standby power, and when the Main power is not available, the solenoid switch connects the output terminal with the second terminal.

The audio / video apparatus (10) according to claim 8, characterized in that the second switch (180) is a solid state switch (410) controlled by a controller (100), the controller (100) causes the second switch (180) to connect the first input terminal to the output terminal when the main power is available, and connect the second input terminal to the output terminal when the main power is not present. available, but the waiting power is still available.

The audio / video apparatus (10) according to claim 8, characterized in that the second switch (180) includes a third terminal coupled with a different one from the first (AUX1) and the second (AUX2) audio inputs, and when the audio / video apparatus (10) is not turned on, the output terminal of the second switch (180) is coupled with a predefined one of the second and third terminals.

The audio / video apparatus (10) according to claim 11, characterized in that the second switch (180) includes a first (520), second (530) and third (510) solid state switches controlled by a controller , each switch has an input terminal and an output terminal, the output terminals of the first (520), second (530) and third (510) electronic switches are joined to form the output terminal of the second switch (180), the input terminal of the first solid state switch (520) is the second terminal of the second switch (180), the input terminal of the second solid state switch (530) is the third terminal of the second switch (180), and the The input terminal of the third solid state switch (510) is the first input terminal of the second switch (180).

The audio / video apparatus (10) according to claim 12, characterized in that the controller (100) turns on the third solid state switch (510) when the audio / video apparatus (10) is turned on, and turns on one of the first (520) ye! second (530) solid state switches when the audio / video apparatus (10) is turned off in accordance with the information stored in the memory (103).

The audio / video apparatus (10) according to claim 3, characterized in that the audio output is coupled with an audio amplifier (15).

15. The audio / video apparatus (10) according to claim 3, characterized in that when the audio / video device (10) is turned off, the standby power is not available for the audio / video device (10). .

16. A television set (10), characterized in that it comprises: a first audio input (AUX1) to receive a first audio signal; a main power source (101) for supplying main power and a source (102) of standby power for supplying standby power; a first switch (140) for selecting one of the first audio signal and one audio transmission signal; an audio output to emit the selected audio signal; and a controller (100) for controlling the first switch (140) in response to the user's signal; wherein: the controller (100) and the first switch (140) operate when the standby power is available.

17. The television apparatus (10) according to claim 16, characterized in that it comprises a second switch (180) having a first input terminal coupled with an output of the first switch (140), a second terminal coupled with the first input ( AUX1), and an output terminal coupled with the audio output, wherein when the audio / video device (10) is turned on, the output terminal of the second switch (180), is coupled with the first terminal, and when the audio / video apparatus (10) is turned off the output terminal of the second switch (180) is coupled with the second terminal.

18. The television apparatus (10) according to claim 17, characterized in that the second switch (180) is not controlled by the controller (100).

The television apparatus (10) according to claim 17, characterized in that the first switch (140) does not operate when the main power is not available but the second switch (180) operates when one of the main and standby energies available.

20. An audio / video system (1) having first and second modes of operation, the system (1) is characterized in that it comprises: a television set (10) having a first input (AUX1) audio to receive a first audio signal, an arrangement (140 and 180) switch to select one of the first audio signal and an audio transmission signal, and an audio output to output the selected audio signal, and an audio amplifier (15) coupled with the output of audio of the television set (10), wherein: in the first mode of operation, the switch arrangement (140 and 180) selects one of the first audio signal and the audio transmission signal in response to the user's command, and in the second mode of operation, the switch (140 and 180) of the switch is set by default to select the first audio signal. The audio / video system (1) according to claim 20, characterized in that the switch arrangement (140 and 180) comprises an electronic switch (140) for selecting one of the first audio signal input and the signal of audio transmission, and a second switch (180) having a first input terminal coupled with an output of the first switch (140), the second terminal coupled with the first audio input (AUX1), and an output terminal coupled with the audio output, where when the audio / video device (10) is turned on, the output terminal of the second switch (180) is coupled with the first terminal and when the audio / video device (10) is turned off , the output terminal of the second switch (180) is coupled with the second terminal.