JP5370194B2 - Amplification equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To discriminate an input signal as being an abnormal test signal which is not a sound signal or a rated test signal. <P>SOLUTION: An amplifying device includes an amplifying device circuit for amplifying an input signal which is one among the sound signal, the rated test signal and the abnormal test signal and outputting an output signal; a silent decision means for deciding whether the signal level of the output signal output from the amplifying device circuit is a silent decision reference value or less; and a level decision means for deciding whether the signal level of the output signal output from the amplifying device circuit is an abnormal test signal reference value or more. The amplifying device, further, includes a signal discriminating means of discriminating the input signal as the abnormal test signal, when a state, in which the signal level of the output signal output from the amplifying device circuit is not the silent decision reference value or less and the signal level of the output signal output from the amplifying device circuit is the abnormal test signal reference value or more, is continued for a fixed time or longer. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an amplifying apparatus that discriminates an abnormal test signal (or a rated test signal).

  In the AV amplifier test, a signal corresponding to the rated level of the AV amplifier (referred to as a rated test signal) is input, a rating test for measuring the rated level of the AV amplifier, and a signal having a signal level higher than the rated level (abnormal) There is an abnormal test that checks whether or not the AV amplifier normally performs a protection process (for example, a power-off state). The AV amplifier needs to determine that the input signal is not an audio signal (music signal) or a rated test signal but an abnormal test signal, and execute protection processing according to the abnormal test signal. Further, it is necessary to clearly discriminate between the abnormality test signal and the audio signal so that the protection process is not executed when the user uses the AV amplifier. The AV amplifier determines that the input signal is not a voice signal or an abnormal test signal but a rated test signal, and sets the power supply voltage supplied to the power amplifier circuit to a low voltage according to the rated test signal. It is necessary to switch.

JP 2007-124766 A

  An object of the present invention is to provide an amplifying apparatus that determines that an input signal is not an audio signal (music signal) or a rated test signal but an abnormal test signal.

  Another object of the present invention is to provide an amplifying apparatus that determines that an input signal is not a voice signal (music signal) or an abnormal test signal but a rated test signal.

  The present invention has been made to achieve any of the above objects.

  An amplification device according to a preferred embodiment of the present invention includes an amplifier circuit that amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal and outputs an output signal; and an output signal output from the amplifier circuit Silence determination means for determining whether or not the signal level of the output signal is below the silence determination reference value, and whether or not the signal level of the output signal output from the amplifier circuit is above the abnormal test signal reference value Level determination means for performing at least the signal level of the output signal output from the amplifier circuit not lower than the silence determination reference value, and the signal level of the output signal output from the amplifier circuit is the abnormality test signal Signal determining means for determining that the input signal is the abnormality test signal when a state determined to be equal to or greater than a reference value continues for a predetermined time or more; .

  When the signal level of the output signal output from the amplifier circuit is not less than the silence determination reference value, it is determined that the signal is not an audio signal. When the signal level of the output signal output from the amplifier circuit is equal to or higher than the abnormal test signal reference value, it can be determined that the signal is not a rated test signal but an abnormal test signal. Here, “at least” means that it is possible to add other conditions for determining an abnormal test signal (the same applies hereinafter).

  In a preferred embodiment, the apparatus further comprises a change amount determining means for determining whether or not the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, and the signal determining means includes at least the signal determining means. The signal level of the output signal output from the amplifier circuit is not less than or equal to the silence determination reference value, the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, and the amplifier circuit When the state in which it is determined that the signal level of the output signal output from the reference signal is equal to or higher than the abnormal test signal reference value continues for a predetermined time or longer, it is determined that the input signal is the abnormal test signal.

  When the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, it is determined that the signal is not an audio signal. Therefore, the abnormality test signal can be determined more accurately.

  In a preferred embodiment, the apparatus further comprises temperature determining means for determining whether or not the temperature inside the amplification device detected by the temperature sensor is equal to or higher than a predetermined temperature, and the signal determining means is output from at least the amplifier circuit. The signal level of the output signal is not lower than the silent judgment reference value, the signal level of the output signal output from the amplifier circuit is higher than the abnormal test signal reference value, and the amplification detected by the temperature sensor When the state in which the temperature inside the apparatus is determined to be equal to or higher than the predetermined temperature continues for a predetermined time or longer, it is determined that the input signal is the abnormality test signal.

  When the temperature inside the amplifier detected by the temperature sensor is equal to or higher than a predetermined temperature, it can be determined that the signal is not a rated test signal but an abnormal test signal. Therefore, the abnormality test signal can be determined more accurately.

  An amplifying device according to another preferred embodiment of the present invention amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal, and outputs an output signal, and is output from the amplifier circuit. Change amount determining means for determining whether or not the amount of change in the signal level of the output signal is within a predetermined range, and whether or not the signal level of the output signal output from the amplifier circuit is greater than or equal to an abnormal test signal reference value Level determination means for determining whether or not the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, and the signal level of the output signal output from the amplifier circuit is abnormal Signal discriminating means for discriminating that the input signal is the abnormal test signal when the state determined to be equal to or greater than the test signal reference value continues for a predetermined time or more;

  When the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, it is determined that the signal is not an audio signal. When the signal level of the output signal output from the amplifier circuit is equal to or higher than the abnormal test signal reference value, it can be determined that the signal is not a rated test signal but an abnormal test signal.

  In a preferred embodiment, the apparatus further comprises temperature determining means for determining whether or not the temperature inside the amplification device detected by the temperature sensor is equal to or higher than a predetermined temperature, and the signal determining means is output from at least the amplifier circuit. The amount of change in the signal level of the output signal is within a predetermined range, the signal level of the output signal output from the amplifier circuit is greater than or equal to the abnormal test signal reference value, and amplification detected by the temperature sensor When the state in which the temperature inside the apparatus is determined to be equal to or higher than the predetermined temperature continues for a predetermined time or longer, it is determined that the input signal is the abnormality test signal.

  When the temperature inside the amplifier detected by the temperature sensor is equal to or higher than a predetermined temperature, it can be determined that the signal is not a rated test signal but an abnormal test signal. Therefore, the abnormality test signal can be determined more accurately.

  An amplifying device according to another preferred embodiment of the present invention amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal, and outputs an output signal, and is output from the amplifier circuit. Silence determination means for determining whether the signal level of the output signal is less than or equal to the silence determination reference value, and whether or not the signal level of the output signal output from the amplifier circuit is greater than or equal to the abnormal test signal reference value A level determination means for determining at least the signal level of the output signal output from the amplifier circuit is not less than or equal to the silence determination reference value, and the signal level of the output signal output from the amplifier circuit is the abnormality Signal discriminating means for discriminating that the input signal is the rated test signal when the state judged to be less than the test signal reference value continues for a predetermined time or more; Obtain.

  When the signal level of the output signal output from the amplifier circuit is not less than the silence determination reference value, it is determined that the signal is not an audio signal. Then, when the signal level of the output signal output from the amplifier circuit is less than the abnormal test signal reference value, it can be determined that the signal is not an abnormal test signal but a rated test signal.

  An amplifying device according to another preferred embodiment of the present invention amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal, and outputs an output signal, and is output from the amplifier circuit. Change amount determining means for determining whether or not the amount of change in the signal level of the output signal is within a predetermined range, and whether or not the signal level of the output signal output from the amplifier circuit is greater than or equal to an abnormal test signal reference value Level determination means for determining whether or not the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, and the signal level of the output signal output from the amplifier circuit is abnormal Signal discriminating means for discriminating that the input signal is the rated test signal when the state judged to be less than the test signal reference value continues for a predetermined time or more;

  When the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, it is determined that the signal is not an audio signal. Then, when the signal level of the output signal output from the amplifier circuit is less than the abnormal test signal reference value, it can be determined that the signal is not an abnormal test signal but a rated test signal.

  It is possible to provide an amplifying apparatus that can determine that the input signal is not an audio signal (music signal) or a rated test signal but an abnormal test signal. Alternatively, it is possible to provide an amplifying device that determines that the input signal is not a voice signal (music signal) or an abnormal test signal but a rated test signal.

1 is a block diagram showing an AV amplifier 1 according to a preferred embodiment of the present invention. It is a wave form diagram in case a signal is an audio | voice signal. It is a wave form diagram in case a signal is a rated test signal and an abnormal test signal. 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; 6 is a flowchart showing processing of the microcomputer 7; FIG. 5 is a block diagram showing an AV amplifier 31 according to another preferred embodiment of the present invention. It is a block diagram which shows AV amplifier 41 by another preferable embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. However, the present invention is not limited to these embodiments. FIG. 1 is a block diagram showing an AV amplifier (amplifier) 1 according to a preferred embodiment of the present invention. The AV amplifier 1 includes an audio input terminal 2, a volume adjustment circuit 3, a power amplifier circuit 4, a speaker terminal 5, a half-wave rectification integration circuit 6, a microcomputer 7, a power supply circuit 8, and a temperature sensor 9. Is provided.

  When the user uses the AV amplifier 1, a source device such as a CD player is connected to the audio input terminal 2, and an audio signal (including the meaning of a music signal; the same applies hereinafter) is input from the CD player. When a rating test is performed, a rating test signal is input to the audio input terminal 2. The rating test is a test in which a rating test signal corresponding to the rating level of the AV amplifier 1 is input and the rating level of the AV amplifier 1 (for example, each rated output channel 120W) is measured.

  When an abnormal test is performed, a signal having a signal level higher than the rated test signal (referred to as an abnormal test signal) is input. The abnormality test is a test for inspecting whether or not the AV amplifier 1 normally executes the protection process with respect to the abnormality test signal. Although the protection process is not particularly limited, in this example, the AV amplifier 1 is turned off. The power-off state is, for example, a complete power-off state, a standby state (a state in which a power supply voltage is supplied only to a part of a circuit such as a microcomputer and a power supply voltage is not supplied to other circuits), and the power amplifier circuit 4 This is a state where only the power source of the device is turned off.

  A signal input to the audio input terminal 2 is supplied to the volume adjustment circuit 3. The volume adjustment circuit 3 adjusts the volume value of the signal supplied from the audio input terminal 2 and supplies it to the power amplifier circuit 4. The power amplifier circuit 4 amplifies the audio signal from the volume adjustment circuit 3 and supplies a signal to a speaker connected to the outside via the speaker terminal 5.

  The operation state of the power supply circuit 8 is controlled by the microcomputer 7 and supplies a power supply voltage to each part of the AV amplifier 1. The temperature sensor 9 is not particularly limited. For example, the temperature sensor 9 is disposed in the vicinity of the power amplifier circuit 4 and the like, detects the temperature inside the AV amplifier 1 (for example, around the power amplifier circuit 4), and detects the detected temperature information in analog form. The electric signal is supplied to the AD port of the microcomputer 7. Further, the temperature sensor 9 may be disposed in the vicinity of the transformer of the power supply circuit 8.

  The half-wave rectification integration circuit 6 is supplied with the output signal from the power amplifier circuit 4, and the half-wave rectification and integration of the output signal from the power amplifier circuit 4 whose signal level fluctuates greatly can be detected by the microcomputer 7. The signal is converted to a signal and supplied to the AD port of the microcomputer 7. The half-wave rectifying and integrating circuit 6 is not essential for the present invention.

  The microcomputer 7 performs AD (analog-digital) conversion on the signal supplied from the half-wave rectification integration circuit 6 to the AD port, and generates a digital value of the signal. The microcomputer 7 determines whether the signal is an audio signal, a rated test signal, or an abnormal test signal by determining the digital value of the signal input to the AD port. Further, the microcomputer 7 AD converts the temperature information supplied from the temperature sensor 9 to the AD port. If necessary, the microcomputer 7 determines whether the signal is an audio signal, a rated test signal, or an abnormal test signal based on the temperature information. When the microcomputer 7 determines that the signal is an abnormality test signal, the microcomputer 7 controls the state of the power supply circuit 8 to change the AV amplifier 1 from the power-on state to the power-off state.

  Hereinafter, a method for determining whether a signal is an audio signal, a rated test signal, or an abnormal test signal will be described.

  (1) The microcomputer 7 determines whether or not there is a period of silence (no signal) in the signal. If there is a period of silence, the microcomputer 7 determines that the signal is an audio signal. On the other hand, if there is no silent period, it is determined that the signal is a rated test signal or an abnormal test signal. For example, as shown in FIG. 2, in the case of an audio signal, for example, there is a silent section between songs, but as shown in FIG. 3, in the case of a rated test signal or an abnormal test signal, continuous Since it is a signal, there is no silent section. Specifically, the microcomputer 7 specifies the digital value of the signal at an interval (for example, 10 milliseconds) that is sufficiently shorter than the general silence time (about 1 second) included in the audio signal, and determines that the signal is silent. It is determined whether or not it is below the reference value. If it is below the silence judgment reference value, there is a silence section, and it can be judged that the signal is an audio signal. If it is larger than the silence judgment reference value, there is no silence section and it is a rated test signal or an abnormal test signal. Can be determined.

  (2) The microcomputer 7 determines whether or not the amount of change in the signal level is within a predetermined range, and if it is within the predetermined range, determines that the signal is a rated test signal or an abnormal test signal. On the other hand, if it is outside the predetermined range, it is determined that the signal is an audio signal. For example, as shown in FIG. 2, in the case of an audio signal, the signal level greatly fluctuates depending on the time, so the amount of change in the signal level may be outside a predetermined range, but as shown in FIG. Alternatively, in the case of an abnormal test signal, the signal level is almost constant, so that the amount of change in the signal level is always within a predetermined range. Specifically, the microcomputer 7 stores the previous signal level in a memory, and determines whether or not the amount of change of the current signal level with respect to the previous signal level is in the range of -a% to + a%. . That is, when the current signal level is Vr and the previous signal level Vb, it is determined whether or not (Vb−Vb × a / 100) <Vr <(Vb + Vb × a / 100). If the change amount is not within the range, it can be determined as an audio signal, and if the change amount is within the range, it can be determined as a rated test signal or an abnormal test signal. Note that the calculation formula for determining whether the change amount of the signal level is within the predetermined range is not limited to the above.

  In the above (1) or (2), it can be determined only whether it is an audio signal, a rated test signal or an abnormal test signal, and it cannot be determined whether it is a rated test signal or an abnormal test signal. Therefore, it is determined whether it is a rated test signal or an abnormal test signal according to (3) or (4) described below.

  (3) The microcomputer 7 determines whether or not the temperature in the AV amplifier 1 is equal to or higher than a predetermined temperature based on the temperature information supplied from the temperature sensor 9. It is determined that On the other hand, if the temperature is lower than the predetermined temperature, it is determined that the signal is a rated test signal. In the abnormal test, as described above, an abnormal test signal having a signal level larger than that of the rated test signal is input. Therefore, the temperature of the power amplifier circuit 4 rises and is detected by the temperature sensor 9 as compared with the case of the rated test. This is because the temperature to be applied becomes high.

  (4) The microcomputer 7 determines whether or not the signal level is equal to or higher than the abnormal test signal reference value. If the signal level is equal to or higher than the abnormal test signal reference value, the microcomputer 7 determines that the signal is an abnormal test signal. On the other hand, if the microcomputer 7 is less than the abnormal test signal reference value, the microcomputer 7 determines that the signal is a rated test signal. In the abnormal test, as described above, an abnormal test signal having a signal level larger than that of the rated test signal is input. Therefore, the signal level of the signal input to the AD port of the microcomputer 7 is larger than that in the rated test. Because it becomes.

  It is discriminated whether or not the signal is an abnormal test signal by combining at least one of the above (1) or (2) with at least one of the above (3) or (4) and executing the discrimination processing. be able to. More specifically, the microcomputer 7 combines at least one of (1) or (2) with at least one of (3) or (4), and the state in which the microcomputer 7 is determined to be an abnormal test signal is a predetermined time ( For example, it is determined that the signal is an abnormal test signal only when it continues for 20 minutes or more. It should be noted that the abnormality test signal can be discriminated very accurately by executing discrimination processing by combining all of (1) to (4).

Hereinafter, processing of the microcomputer 7 will be described.
[Example 1]
FIG. 4 is a flowchart showing the abnormality test signal discrimination process of the microcomputer 7 in this example. In this example, the above processes (1) and (4) are combined and executed. The microcomputer 7 resets the timer stored in the built-in memory and starts counting the timer (S1). This timer is for measuring the predetermined time (for example, 20 minutes). The timer continues counting even during execution of the following processes. In the following, if it is determined that the signal is not an abnormal test signal, the process returns to S1 and the timer is reset each time.

  The microcomputer 7 specifies (samples) the digital value of the signal output from the power amplifier circuit 4 and input to the AD port of the microcomputer 7 at predetermined time intervals (for example, 10 milliseconds), and saves it in the built-in memory ( S2). The following processes of S3 to S5 are determination processes for one sampled signal level. The microcomputer 7 determines the digital value of the signal and determines whether or not the signal level is equal to or lower than the silence determination reference value (S3). If the signal level is equal to or lower than the silence determination reference value (YES in S3), it is determined that the signal is not an abnormal test signal but an audio signal, so the process returns to S1 and the timer is reset.

  If the signal level is larger than the silence determination reference value (NO in S3), the microcomputer 7 determines whether or not the signal level is equal to or higher than the abnormality test signal reference value (S4). If the signal level is less than the abnormal test signal reference value (NO in S4), it is determined that the signal is not the abnormal test signal but the rated test signal, so the process returns to S1 and the timer is reset.

  If the signal level is equal to or higher than the abnormal test signal reference value (YES in S4), the microcomputer 7 determines whether or not the timer count is equal to or longer than a predetermined time (20 minutes) (S5). If the timer count is still less than the predetermined time (NO in S5), the process returns to S2 and the same processing is performed again on the digital value of the next sampled signal. On the other hand, if the timer count is equal to or longer than the predetermined time (YES in S5), the microcomputer 7 determines that the signal is the abnormal test signal because the condition of the abnormal test signal continues for the predetermined time or longer. Then, the AV amplifier 1 is controlled to be in a power-off state.

[Example 2]
FIG. 5 is a flowchart showing the abnormality test signal determination process of the microcomputer 7 in this example, and is different from the first example only in that S4 is changed to S7. That is, in this example, the above processes (1) and (3) are combined and executed.

  If NO is determined in S3, the microcomputer 7 determines whether the temperature in the AV amplifier 1 is equal to or higher than a predetermined temperature based on the temperature information from the temperature sensor 9 (S7). If it is less than the predetermined temperature (NO in S7), it is determined that it is not an abnormal test signal but a rated test signal, so the process returns to S1 and the timer is reset. If the temperature is equal to or higher than the predetermined temperature (YES in S7), the process proceeds to S5. In addition, since other processes are the same as those in the first embodiment, the description is cited.

[Example 3]
FIG. 6 is a flowchart showing the abnormality test signal discrimination process of the microcomputer 7 in this example, and is different from the first example only in that S7 is added. That is, in this example, the processes (1), (3), and (4) are combined and executed. The process of S7 is as described in the second embodiment, and the other processes are as described in the first embodiment.

[Example 4]
FIG. 7 is a flowchart showing the abnormality test signal determination process of the microcomputer 7 in this example, and is different from the first example only in that S3 is changed to S8. That is, in this example, the processes (2) and (4) are combined and executed.

  After S2, the microcomputer 7 compares the digital value of the signal determined this time with the digital value of the signal previously determined and stored in the memory, and the change amount of the current signal level with respect to the previous signal level is −a. It is determined whether it is in the range of% to + a% (S8). If not (NO in S8), it is determined that the signal is not an abnormal test signal but an audio signal, so the process returns to S1 and the timer is reset. On the other hand, if it is present (YES in S8), the process proceeds to S4. Since other processes are the same as those in the first embodiment, the description is incorporated.

[Example 5]
FIG. 8 is a flowchart showing the abnormality test signal discrimination process of the microcomputer 7 in this example, and is different from the first example only in that S8 is added. That is, in this example, the processes (1), (2), and (4) are combined and executed. The process of S8 is as described in the fourth embodiment, and the other processes are as described in the first embodiment.

[Example 6]
FIG. 9 is a flowchart showing an abnormality test signal determination process of the microcomputer 7 in this example, and differs from the fourth example only in that S4 is changed to S7. That is, in this example, the processes (2) and (3) are combined and executed. The process of S7 is as described in the second embodiment, and the other processes are as described in the first and fourth embodiments.

[Example 7]
FIG. 10 is a flowchart showing the abnormality test signal discrimination process of the microcomputer 7 in this example, and is different from the example 5 only in that S7 is added. That is, in this example, the processes (1), (2), (3), and (4) are combined and executed.

  As described above, the abnormality test signal is discriminated by all combinations other than the above combinations as long as it is a combination of at least one of (1) or (2) and at least one of (3) or (4). can do.

  Next, another preferred embodiment of the present invention will be described. In this example, whether or not the signal is a rated test signal is determined by the processes (1) to (4). If it is determined that the signal is a rated test signal, the microcomputer 7 controls the power supply circuit 8 so that the power supply voltage supplied to the power amplifier circuit 4 is switched to a low voltage.

Hereinafter, processing of the microcomputer 7 will be described.
[Example 8]
FIG. 11 is a flowchart showing a rating test signal discrimination process of the microcomputer 7 in this example. In this example, the above processes (1) and (4) are combined and executed. The microcomputer 7 resets the timer stored in the built-in memory and starts counting the timer (S1). This timer is for measuring a predetermined time (for example, 20 minutes). The timer continues counting even during execution of the following processes. In the following, if it is determined that the signal is not a rated test signal, the process returns to S1 and the timer is reset each time.

  The microcomputer 7 specifies (samples) the digital value of the signal output from the power amplifier circuit 4 and input to the AD port of the microcomputer 7 at predetermined time intervals (for example, 10 milliseconds), and saves it in the built-in memory ( S2). The following processes of S3 to S5 are determination processes for one sampled signal level. The microcomputer 7 determines the digital value of the signal and determines whether or not the signal level is equal to or lower than the silence determination reference value (S3). If the signal level is equal to or less than the silence determination reference value (YES in S3), it is determined that the signal is not a rated test signal but an audio signal, so the process returns to S1 and the timer is reset.

  If the signal level is larger than the silence determination reference value (NO in S3), the microcomputer 7 determines whether or not the signal level is equal to or higher than the abnormality test signal reference value (S4). If the signal level is equal to or higher than the abnormal test signal reference value (YES in S4), it is determined that the signal is not the rated test signal but the abnormal test signal, so the process returns to S1 and the timer is reset.

  If the signal level is less than the abnormal test signal reference value (NO in S4), the microcomputer 7 determines whether or not the timer count is equal to or longer than a predetermined time (20 minutes) (S5). If the timer count is still less than the predetermined time (NO in S5), the process returns to S2 and the same processing is performed again on the digital value of the next sampled signal. On the other hand, if the timer count is equal to or longer than the predetermined time (YES in S5), the microcomputer 7 determines that the signal is the rated test signal because the condition of the rated test signal continues for the predetermined time or longer. Then, the power supply voltage supplied to the power amplifier circuit 4 is switched to a low voltage.

[Example 9]
FIG. 12 is a flowchart showing the rating test signal discrimination process of the microcomputer 7 in this example, and is different from the example 8 only in that S7 is added. That is, in this example, the processes (1), (3), and (4) are combined and executed.

  If NO is determined in S4, the microcomputer 7 determines whether or not the temperature in the AV amplifier 1 is equal to or higher than a predetermined temperature based on the temperature information from the temperature sensor 9 (S7). If the temperature is equal to or higher than the predetermined temperature (YES in S7), it is determined that the test signal is not the rated test signal but the abnormal test signal, so the process returns to S1 and the timer is reset. If the temperature is lower than the predetermined temperature (NO in S7), the process proceeds to S5. In addition, since other processes are the same as those in the eighth embodiment, the description is cited.

[Example 10]
FIG. 13 is a flowchart showing the rated test signal discrimination processing of the microcomputer 7 in this example, and differs from the eighth example only in that S3 is changed to S8. That is, in this example, the processes (2) and (4) are combined and executed.

  After S2, the microcomputer 7 compares the digital value of the signal determined this time with the digital value of the signal previously determined and stored in the memory, and the change amount of the current signal level with respect to the previous signal level is −a. It is determined whether it is in the range of% to + a% (S8). If not (NO in S8), it is determined that the signal is not a rated test signal but an audio signal, so the process returns to S1 and the timer is reset. On the other hand, if it is present (YES in S8), the process proceeds to S4. Since other processes are the same as those in the eighth embodiment, the description is incorporated.

[Example 11]
FIG. 14 is a flowchart showing the rating test signal discrimination process of the microcomputer 7 in this example, and is different from the example 8 only in that S8 is added. That is, in this example, the processes (1), (2), and (4) are combined and executed.

[Example 12]
FIG. 15 is a flowchart showing the rating test signal discrimination processing of the microcomputer 7 in this example, and is different from Example 11 only in that S7 is added. That is, in this example, the processes (1), (2), (3), and (4) are combined and executed.

  As described above, if the combination of at least one of (1) or (2) and at least one of (3) or (4) is used, the rated test signal shall be determined by all combinations other than the above combinations. Can do. Note that the abnormality test signal discrimination process and the rated test signal discrimination process may be executed by the microcomputer 7 in parallel. In this case, a common timer may be used to manage which signal is currently counted between the abnormal test signal and the rated test signal by a flag or the like.

  Next, another preferred embodiment of the present invention will be described. When the AV amplifier can amplify audio signals of a plurality of channels (for example, front left, front right, center, surround left, surround right 5 channels), the output signals of the power amplifier circuits of all channels are It is necessary to execute the above processing.

  Therefore, the load of the microcomputer 7 is reduced by synthesizing the signals of the respective channels output from the power amplifier circuit 4 and executing the above-described abnormality test signal discrimination processing on the synthesized signal. FIG. 16 is a block diagram showing the AV amplifier 31 of this example. The 5-channel signal from the power amplifier circuit 4 is synthesized by the adder circuit 32 and the synthesized signal is supplied to the half-wave rectifying and integrating circuit 6.

  FIG. 17 shows an AV amplifier 41 according to still another preferred embodiment of the present invention, and an adder circuit 32 is provided at the subsequent stage of the half-wave rectifying and integrating circuit 6 as compared with the AV amplifier 31 of FIG. The five-channel signals from the half-wave rectifying and integrating circuit 6 are combined by the adding circuit 32 and the combined signal is supplied to the microcomputer 7.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment. The present invention is also applicable to an apparatus including an amplifying apparatus such as a TV receiver.

  The present invention can be suitably employed in AV amplifiers, amplifiers and the like.

DESCRIPTION OF SYMBOLS 1 AV amplifier 2 Audio | voice input terminal 3 Volume adjustment circuit 4 Power amplifier circuit 5 Speaker terminal 6 Half-wave rectification integration circuit 7 Microcomputer 8 Power supply circuit 9 Temperature sensor

Claims (7)

An amplifier circuit that amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal, and outputs an output signal;
Silence determination means for determining whether the signal level of the output signal output from the amplifier circuit is equal to or less than a silence determination reference value;
Level determination means for determining whether or not the signal level of the output signal output from the amplifier circuit is equal to or higher than an abnormal test signal reference value;
At least the signal level of the output signal output from the amplifier circuit is not less than the silence determination reference value, and the signal level of the output signal output from the amplifier circuit is greater than or equal to the abnormality test signal reference value. An amplifying apparatus comprising: a signal determining unit that determines that the input signal is the abnormality test signal when the determined state continues for a predetermined time or more. A change amount determining means for determining whether or not the change amount of the signal level of the output signal output from the amplifier circuit is within a predetermined range;
The signal determining means has at least a signal level of the output signal output from the amplifier circuit not lower than the silence judgment reference value, and a change amount of the signal level of the output signal output from the amplifier circuit is within a predetermined range. And when the signal level of the output signal output from the amplifier circuit is determined to be equal to or higher than the abnormal test signal reference value for a predetermined time or longer, the input signal is the abnormal test signal. The amplifying apparatus according to claim 1, wherein it is determined that Temperature determining means for determining whether or not the temperature inside the amplification device detected by the temperature sensor is equal to or higher than a predetermined temperature;
The signal discriminating means is such that at least the signal level of the output signal output from the amplifier circuit is not less than or equal to the silence determination reference value, and the signal level of the output signal output from the amplifier circuit is the abnormal test signal reference When the state in which the temperature inside the amplifying device detected by the temperature sensor is determined to be equal to or higher than a predetermined temperature continues for a predetermined time or longer, the input signal is determined to be the abnormality test signal. The amplifying device according to claim 1. An amplifier circuit that amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal, and outputs an output signal;
A change amount judging means for judging whether or not a change amount of the signal level of the output signal output from the amplifier circuit is within a predetermined range;
Level determination means for determining whether or not the signal level of the output signal output from the amplifier circuit is equal to or higher than an abnormal test signal reference value;
It is determined that at least the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, and the signal level of the output signal output from the amplifier circuit is greater than or equal to the abnormal test signal reference value An amplifying apparatus comprising: a signal discriminating unit that discriminates that the input signal is the abnormality test signal when the state to be performed continues for a predetermined time or more. Temperature determining means for determining whether or not the temperature inside the amplification device detected by the temperature sensor is equal to or higher than a predetermined temperature;
The signal discriminating means has at least a change amount of the signal level of the output signal output from the amplifier circuit within a predetermined range, and the signal level of the output signal output from the amplifier circuit is the abnormality test signal reference When the state in which the temperature inside the amplifying device detected by the temperature sensor is determined to be equal to or higher than a predetermined temperature continues for a predetermined time or longer, the input signal is determined to be the abnormality test signal. The amplification device according to claim 4. An amplifier circuit that amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal, and outputs an output signal;
Silence determination means for determining whether the signal level of the output signal output from the amplifier circuit is equal to or less than a silence determination reference value;
Level determination means for determining whether or not the signal level of the output signal output from the amplifier circuit is equal to or higher than an abnormal test signal reference value;
At least the signal level of the output signal output from the amplifier circuit is not less than or equal to the silence determination reference value, and the signal level of the output signal output from the amplifier circuit is less than the abnormality test signal reference value. An amplifying apparatus comprising: a signal determining unit that determines that the input signal is the rated test signal when the determined state continues for a predetermined time or more. An amplifier circuit that amplifies an input signal that is one of an audio signal, a rated test signal, and an abnormal test signal, and outputs an output signal;
A change amount judging means for judging whether or not a change amount of the signal level of the output signal output from the amplifier circuit is within a predetermined range;
Level determination means for determining whether or not the signal level of the output signal output from the amplifier circuit is equal to or higher than an abnormal test signal reference value;
At least the amount of change in the signal level of the output signal output from the amplifier circuit is within a predetermined range, and the signal level of the output signal output from the amplifier circuit is determined to be less than the abnormal test signal reference value An amplifying apparatus comprising: a signal discriminating unit that discriminates that the input signal is the rated test signal when the state to be performed continues for a predetermined time or more.

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