JPH04633A - Signal processor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal processing device that detects an amplitude peak value of an input signal by comparing data levels of digitized input signals.

2. Description of the Related Art In recent years, digital technology has been introduced into signal processing devices, and video or audio signals are digitally processed.

Conventionally, when detecting the peak value of an input signal, it has been carried out using an analog element configuration in an analog signal state.

Problems to be Solved by the Invention Since such conventional signal processing devices perform peak detection in an analog manner, an analog peak detection circuit is required when connecting to a digital signal processing circuit.
Furthermore, it has the disadvantage that it is difficult to accurately measure the amplitude peak value of an input signal due to variations in temperature characteristics of analog elements and elements.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a signal processing device that can detect the peak of an input signal from the data level after digitally converting an input analog signal.

Means for Solving the Problems In order to achieve the above object, the present invention provides a signal processing device that inputs first digital data obtained by digitally converting an analog signal and outputs second digital data. a comparison circuit that inputs digital data and the second digital data, compares the magnitude of an analog value given by each digital data, and outputs a first control signal and a second control signal; a first switch that switches and outputs the first digital data and the second digital data using a control signal; and a first switch that switches and outputs the first digital data and the second digital data using a control signal; a second switch that switches and outputs data; and a holding circuit that inputs the output of the second switch and holds it until the completion of the next comparison operation of the comparison circuit and outputs it as the second digital data. wherein the first control signal controls the first switch to output the digital data having a larger analog value given by the first and second digital data; The control signal outputs the second digital data when the digital data output of the first switch and the analog value given by the second digital data are equal, and outputs the output of the second switch when they are not equal. , the signal processing device controls the second switch to output.

Effect of the present invention With the above configuration, the first switching device outputs the larger of input digital data (first digital data) and output digital data (second digital data), and the second switching device outputs the larger one of input digital data (first digital data) and output digital data (second digital data). Replace it with the second output obtained from the previous comparison (if it is the same as the previous one, leave it unchanged), and hold it in the holding circuit.

Embodiment Hereinafter, a signal processing device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a signal processing device according to an embodiment of the present invention. In the figure, 1 is a digital signal input terminal, 2 is a comparator circuit that compares the levels of two input data A switch for switching to input or S input, 5 a holding circuit for holding data from the switch 4, 6 an output terminal for outputting the amplitude peak value of input data, and 7 a system clock.

Regarding the signal processing device of the embodiment in which the above-mentioned components are connected as shown in FIG. 1, the mutual relationship and operation of the components will be explained below. First, consider a case where digital data corresponding to sample values A, B, C, . . . of the waveform shown in FIG. 2 is input to the digital signal input terminal 1. FIG. 2 shows the waveform of an analog signal corresponding to digital data that has been converted into a digital signal.

The data input to digital input terminal 1 is
If it is a point, the data before time B is input to the y input of the comparator circuit 2, and this is now set as the data at point A. The comparison circuit 2 compares the levels of the data at the X input and the data at the y input.

At this time, if x>y, the A input of the switch 3 is output to the output Y of the switch 3, and if x<y, the output Y of the switch 3 is output to the output Y of the switch 3. The configuration is such that the relationship between the a output of the comparator circuit 2 and the S input of the switching device 3 is maintained so that the S input is output. Therefore, the output of switch 3 is input X and y
As a result of comparing points A and B in FIG. 2, the data level of point B is output to the Y output of the switch 3. The operation of the switch 4 is based on the output result of the comparator circuit 2. When x=y, the B input of the switch 4 is output to the Y output of the switch 4, and when x+y, the Y output of the switch 4 is output. In this case, the circuit configuration is such that the relationship between the b output of the comparator circuit 2 and the S input of the switch 4 is maintained so that the A input of the switch 4 is output. The DFF 5 holds the data of the switch 4 until the next comparison result is obtained.

Therefore, the maximum amplitude data of the input signal is output to the output terminal 6. In FIG. 2, data at point F is output from the output terminal 6.

As described above, according to the signal processing device of the embodiment of the present invention, digital data obtained by A/D converting an analog signal is input,
The peak value of a signal is digitally detected by continuously comparing the digital data with the previously compared digital data in a comparison circuit, holding the larger one, and comparing it with the next digital data input. I can do it.

Effects of the Invention As is clear from the above embodiments, the present invention provides a signal processing device that inputs first digital data obtained by converting an analog signal into digital data and outputs second digital data. and said second digital data, and compares the magnitude of an analog value given by each digital data to output a first control signal and a second control signal; and said first control circuit; a first switch that switches and outputs the first digital data and the second digital data with a signal; and a first switch that switches and outputs the first digital data and the second digital data with the second control signal; A second switch for switching and outputting, and a holding circuit for inputting the output of the second switch, holding it until the completion of the next comparison operation of the comparison circuit, and outputting it as the second digital data. , the first control signal is connected to the first and second control signals.
The second control signal is controlled so that the digital data having a larger analog value given by the digital data of the first switch is output from the first switch, and the second control signal is controlled to output the digital data of the digital data of the first switch and the digital data of the first switch. When the analog values given by the second digital data are equal, use the second digital data, and when they are not equal, use the output of the second switch,
By using a signal processing device that controls the second switching device to output, the peak value of the signal can be detected in the state of digital data, and the signal processing value for digitally processing the signal can be detected. This has the effect of eliminating the need to provide an analog peak value detection circuit at each location.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a signal processing device according to an embodiment of the present invention, and FIG. 2 is a waveform diagram of the signal processing device according to an embodiment of the present invention. 1...First digital data input terminal, 2...
... Comparison circuit, 3... First switching circuit,
4...Second switching circuit, 5...Holding circuit, 6...Second digital data output terminal,
8...First control signal, 9...Second control signal. Name of agent Patent attorney Shigetaka Awano and 1 other person Figure 1 yl Te° data input i Philippines-China AC circuit Kii I cut 1 Moxibustion circuit 2nd t1 Flame circuit holding port Sδ 2nd Den ° ° Glute °Nita Shichiriki□Ω1 theory 1st control signal 20th early '171 i word

Claims (1)

[Claims] In a signal processing device that inputs first digital data obtained by converting an analog signal into digital data and outputs second digital data, the first digital data and the second digital data are input and each digital data is output. a comparison circuit that compares the magnitudes of analog values given by and outputs a first control signal and a second control signal, and a comparison circuit that outputs a first control signal and a second control signal; a first switch that switches and outputs; and a second switch that switches and outputs the output.
a second switch that switches and outputs the output of the first switch and the second digital data using a control signal; and a second switch that inputs the output of the second switch and performs the next comparison of the comparison circuit. A holding circuit is provided that holds the data until the end of the work and outputs it as the second digital data, and the first control signal outputs the digital data with the larger analog value given by the first and second digital data to the second digital data. When the digital data output of the first switch and the analog value given by the second digital data are equal, the second control signal is output from the second switch. A signal processing device comprising means for controlling the digital data of the second switch so that the second switch outputs the output of the second switch when the digital data of the two switches are not equal.