专利汇可以提供Apparatus and method for adjusting sound volume for televisions and other audio systems专利检索,专利查询,专利分析的服务。并且An apparatus (10) for adjusting sound volume for an audio system includes a controller (101) connected to an amplifier (40) of the audio system for controlling amplification of the amplifier, and a first circuit (102) for adjusting the sound volume. The controller includes a microprogrammed control unit (1010), a random-access memory (1012), and an electrically erasable programmable read-only memory (1014). The first circuit includes an attenuation circuit (1022) connected to a tuner of the audio system for attenuating input audio signals, and a switch (1024). An input end of the switch is connected to the tuner and an output end of the attenuation circuit, and an output end of the switch is connected to an audio processor (30) of the audio system. The apparatus enables a user to freely adjust an average level of sound produced by the audio system, and simultaneously avoid being bothered by loud transmissions.,下面是Apparatus and method for adjusting sound volume for televisions and other audio systems专利的具体信息内容。
This application is related to a copending U.S. patent application entitled “APPARATUS AND METHOD FOR ADJUSTING SOUND VOLUME FOR TELEVISIONS AND OTHER AUDIO SYSTEMS”, filed on the same day with the same applicant and assignee as the invention. The disclosure of the above identified application is incorporated herein by reference.
1. Field of the Invention
The present invention relates to apparatuses and methods for adjusting and attenuating sound volume for televisions and other audio systems.
2. Description of Prior Art
At times, a television or radio may broadcast an unexpected, noisy transmission to a user due to a programming change or when there are problems with reception. For example, a television or radio program provider may intentionally broadcast an advertisement at an abruptly high volume so as to attract a user's attention. On other occasions, signals received by the television or radio may be interfered with by signals transmitted by other electronic devices, thereby generating static or other unwanted transmissions. Loud advertisements or unexpected noises are perhaps least likely to bother the user during the daytime or in an environment that is otherwise relatively noisy. However, the user is likely to be easily bothered late at night or in a relatively quiet environment.
In order to overcome the above-mentioned problem, U.S. Pat. No. 5,130,665, issued on Jul. 14, 1992, discloses an audio volume controller. When the audio volume controller is in a control mode, the audio volume controller outputs audio signals whose volumes are between a predefined minimum volume and a predefined maximum volume. That is, the audio volume controller cannot output any audio signal whose volume is higher than the predefined maximum volume. This enables the user to avoid being bothered by loud noises. However, the user cannot freely adjust the average level of the sound produced by the audio volume controller in the control mode unless he/she switches the audio volume controller to exit the control mode. Thus, it is not convenient for the user to use the audio volume controller.
Accordingly, a primary object of the present invention is to provide an apparatus for facilitating a user to not only freely adjust an average level of sound produced by an audio system according to his/her particular requirements, but also simultaneously avoid being bothered by loud transmissions.
A second object of the present invention is to provide a method for facilitating a user to not only freely adjust an average level of sound produced by an audio system according to his/her particular requirements, but also simultaneously avoid being bothered by loud transmissions.
In order to fulfill the above-mentioned primary object, the present invention provides an apparatus for adjusting sound volume for an audio system. The apparatus comprises a controller connected to an amplifier of the audio system for controlling amplification of the amplifier, and a first circuit for adjusting the sound volume. The controller comprises a microprogrammed control unit (MCU). The first circuit comprises an attenuation circuit for attenuating input audio signals, and a first switch. The attenuation circuit comprises: a first resistance, one end of the first resistance being connected to a tuner of the audio system; a second resistance, one end of the second resistance being connected to another end of the first resistance, and another end of the second resistance being grounded; a third resistance, one end of the third resistance being connected to the other end of the first resistance; a first diode, the cathode of the first diode being connected to another end of the third resistance, and the anode of the first diode being grounded; and a second diode, the anode of the second diode being connected to the other end of the third resistance, and the cathode of the second diode being grounded. An input end of the first switch is connected to the tuner of the audio system and the other end of the first resistance, and an output end of the first switch is connected to an audio processor of the audio system.
In order to fulfill the above-mentioned second object, the present invention provides a method for adjusting sound volume for an audio system. The method comprises the following steps: (a) determining whether an apparatus for adjusting sound volume is in an attenuation mode; (b) controlling a first switch to switch a circuit for adjusting sound volume to an attenuation mode, if the apparatus for adjusting sound volume is in the attenuation mode; (c) attenuating an input audio signal, the input audio signal traveling through a first resistance and a second resistance if a first diode and a second diode do not allow the input audio signal through; and (d) repeating steps (a) through (c) until the audio system is turned off.
Other objects, advantages and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
The operating mode of the circuit 102 corresponds to the operating mode of the apparatus 10. When the apparatus 10 is in the normal mode, the circuit 102 is also in a normal mode; similarly, when the apparatus 10 is in the attenuation mode, the circuit 102 is also in an attenuation mode. The circuit 102 comprises an attenuation circuit 1022, and a switch 1024 for switching the operating mode of the circuit 102. Input ends of the attenuation circuit 1022 and the switch 1024 are connected to a tuner 20 of the television. The output end of the attenuation circuit 1022 is connected to an input end of the switch 1024. The MCU 1010 is connected to the switch 1024, for controlling the switch 1024 to switch the operating mode of the circuit 102 according to the operating mode of the apparatus 10. The switch 1024 is connected to an audio processor 30, for outputting thereto unadjusted audio signals or audio signals attenuated by the attenuation circuit 1022.
Vo=Vi(0≦Vi≦Vim)
When the viewer selects the attenuation mode of the apparatus 10 through the infrared remote control device 50 or the functional key on the television itself, the MCU 1010 controls the switch 1024 to switch the circuit 102 to the attenuation mode. In such case, the audio signals transmitted by the tuner 20 of the television are input to the attenuation circuit 1022. If the viewer would like the input audio signal Vi to be attenuated slightly after traveling through the attenuation circuit 1022, he/she may turn off the mechanical switch S so that the input audio signal Vi travels only through the resistance R1 and the resistance R2. In such case, the thick, gentler-sloping broken line of
Vo=Vi*R2/(R1+R2) (S is off; 0≦Vi≦Vim)
If the viewer would like the input audio signal Vi to be attenuated significantly after traveling through the attenuation circuit 1022, he/she may turn on the mechanical switch S. According to electrical characteristics of a diode, the diode allows an input audio signal through only when a positive voltage of the input audio signal is the same as or higher than a threshold positive voltage of the diode. The threshold positive voltage is a voltage that enables the input audio signal to travel from the anode of the diode to the cathode thereof. Different diodes have different threshold positive voltages. For example, the threshold positive voltage of a silicon diode is typically 0.5V, whereas the threshold positive voltage of a germanium diode is typically 0.1V. A value Vi1 of
Accordingly, when the input audio signal Vi is lower than the value Vi1, it is not allowed through by any one of the diodes D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12. In such case, the input audio signal Vi travels through the resistances R1, R2. When the input audio signal Vi is between the value Vi1 and the value Vi2, it is allowed through only by the diode D1 (or the diode D2.) In such case, the input audio signal Vi travels through the resistances R1, R2, R3. When the input audio signal Vi is between the value Vi2 and the value Vi3, it is allowed through by the diodes D1, D3, D4 (or the diodes D2, D5, D6.) In such case, the input audio signal Vi travels through the resistances R1, R2, R3, R4. When the input audio signal Vi is between the value Vi3 and the value Vim, it is allowed through by the diodes D1, D3, D4, D7, D8, D9 (or the diodes D2, D5, D6, D10, D11, D12.) In such case, the input audio signal Vi travels through the resistances R1, R2, R3, R4, R5. Thus, the solid line of
Vo=Vi*R2/(R1+R2) (S is on; 0≦Vi≦Vi1)
Vo=Vi*R33/(R1+R33) (S is on; Vi1<Vi≦Vi2)
Vo=Vi*R44/(R1+R44) (S is on; Vi2<Vi≦Vi3)
Vo=Vi*R55/(R1+R55) (S is on; Vi3<Vi≦Vim)
The value R33 represents a total resistance of the parallel-connected resistances R2, R3. The value R44 represents a total resistance of the parallel-connected resistances R2, R3, R4. The value R55 represents a total resistance of the parallel-connected resistances R2, R3, R4, R5. In electronics, the more parallel-connected resistances there are, the lower the total resistance. Consequently, the following relationship holds: R2/(R1+R2)>R33/(R1+R33)>R44/(R1+R44)>R55/(R1+R55). This means that the attenuation circuit 1022 attenuates the input audio signal Vi gradually. Further, the higher the input audio signal Vi is, the more it is attenuated. The audio signal Vo output by the attenuation circuit 1022 is an attenuated audio signal. The attenuated audio signal travels through the switch 1024 and the audio processor 30, and then is broadcast by a speaker of the television after being amplified by the amplifier 40. In this way, the viewer avoids being bothered by loud advertisements or unexpected noises.
The resistances R1, R2, R3, R4, R5 may be either the same or different, according to the particular requirements of a manufacturer of the television. In addition, the number of parallel-connected resistances and their corresponding diodes may be decreased according to the particular requirements of the manufacturer. In particular, the resistance R5 and its corresponding diodes D7, D8, D9, D10, D11, D12, or/and the resistance R4 and its corresponding diodes D3, D4, D5, D6 may be omitted. Moreover, the number of parallel-connected resistances and their corresponding diodes may be increased according to the particular requirements of the manufacturer. Any additional parallel-connected resistances and their corresponding diodes have similar connections to those of the parallel-connected resistances R1, R2, R3, R4, R5 and their corresponding diodes D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12.
When the apparatus 10 is in the attenuation mode, the viewer can simultaneously adjust sound volume via the infrared remote control device 50 or a functional key on the television itself according to his/her particular requirements. In order to realize the above-described function of adjusting sound volume, the MCU 1010 controls the degree to which the amplifier 40 amplifies the audio signals. The apparatus 10 of the present invention is also applicable to other audio systems besides televisions, such as radios, CD disc players and personal stereos.
The above-described procedure is repeated continually from the time the viewer turns on the television until the time the viewer turns off the television.
While a preferred embodiment and preferred method of the present invention have been described above, it should be understood that they have been presented by way of example only and not by way of limitation. Thus the breadth and scope of the present invention should not be limited by the above-described exemplary embodiment and method, but should be defined only in accordance with the following claims and their equivalents.
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