JPS6024735A - Receiver - Google Patents

Abstract

PURPOSE:To enable multi-pass distortion suppression process at the time of channel selection by storing beforehand multi-pass retaining information correspond to a received frequency in a memory. CONSTITUTION:The memory 6 stores information on multi-pass distortion components through the receiving portion 2 and a frequency designing signals through a central operation processor 4. According to this information, the central operation processor 4 calculates filtering characteristics which are to cancel multi-pass distortion components, and controls the digital filter 3. Since this information is handled depending upon the frequency of the frequency designating signal, this receiver can control the digital filter 3 so that multi-pass can be reduced as much as possible depending upon the received frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to receivers, and particularly to receivers that automatically reduce Martino distortion.

(Prior art) In recent years, digital filters have been used in audio FM receivers. The one used is proposed t).

This type of receiver requires a custom-made digital filter (
Rainbow multi and OS distortion can be suppressed by changing the frequency characteristics (1 phase (custom-made)), but when performing the above suppression control using real-time processing using a microcomputer, etc., the modulation state of the received wave, the A/D Due to limitations in converter processing speed, microcomputer processing speed, etc., multi-A distortion cannot be suppressed immediately after tuning, and there is a time lag before normal reception is achieved. there were.

(Object of the invention) The object of the present invention is to solve the above-mentioned drawbacks of the conventional ones.
It is an object of the present invention to provide a receiver capable of performing accurate multi-A distortion suppression processing at the same time as channel selection.

(Structure of the Invention) The receiver according to the present invention includes a digital filter inserted between the front end and the IP stage, and a digital filter that removes multipath distortion components from the IF stage and the subsequent circuit. The central processing section is equipped with a central processing section for controlling the frequency characteristics and phase characteristics of the digital filter, and a memory for storing control data, and the central processing section receives the frequency specification from the reception frequency control section according to the The digital filter is configured to be able to control the filter characteristics such that the multi-noise distortion is minimized.

(Example) Embodiments of the present invention will be described based on the drawings.

In the figure, 1 is a front end and 2 is an IF amplifier.

A receiving section such as an FM detector, 3 a digital filter inserted between the receiving section and the front end 1, 4 a central processing section for controlling the digital filter 3, and 5 a frequency control section. And.

Tuning frequency of front end 1? It is designed to send a frequency instruction signal to the central processing section 4 as well as a control section. 6 is memory.

A RAM (random access memory) that can be written to and read from is used.

The memory 6 stores information regarding the multi-ξ distortion components from the receiving IS section 2 and information regarding the frequency instruction signal from the central processing section 4, respectively. It is now entered via the The central processing unit 4 calculates filtering characteristics for canceling multipath distortion components based on this information, and controls the digital filter 3. Further, since this information is processed in accordance with the frequency of the frequency instruction signal, the digital filter 3 is controlled in accordance with the reception frequency to minimize the number of multipaths. Digital filter 3? The sequence to be controlled is stored in the memory 6, and is automatically read out depending on the receiving frequency, so that the multi-ξ-s distortion can be immediately reduced.

In the embodiment, the memory 6 is configured such that the stored control data is automatically updated to new data in accordance with the reception state after tuning, and the stored control data is When it is no longer possible to cope with the reception state after a station, the clear state is automatically established.

(Effect of the invention) According to the receiver 1g machine according to the present invention, in the memory.

Since the multi/pass suppression information corresponding to the receiving frequency is stored in advance, multi/mistakes can be suppressed immediately after selecting one station, and no time lag occurs. Therefore, there is no possibility that unpleasant distortion will occur every time a channel is selected, unlike the conventional method, and comfortable reception 2 can always be performed.

[Brief explanation of drawings]

The drawing is a block diagram showing an embodiment of the receiver according to the present invention. 1: Front end, 2: Receiving section, 3: Digital filter, 4: Central processing section, 5: Frequency control section Patent applicant Accuphase Co., Ltd.

Claims (1)

[Claims] 1. A digital filter interposed between the front end and the IP stage, and a digital filter configured to remove multi-signal distortion components from the IP stage and the subsequent circuit. and a central processing unit for controlling frequency characteristics and phase characteristics. and a memory for storing control data, and the central processing unit controls the digital filter in accordance with one frequency designation word from the reception frequency control unit () so that the multi-A distortion is minimized. The receiver 2 is characterized in that it is configured to perform custom control, and the memory is configured such that the stored control data is automatically updated to new data in accordance with the reception state after tuning. The receiver 3 according to claim 1, characterized in that the memory is configured to automatically clear the stored control data when it corresponds to the actual reception state and reaches the end of its life. The receiver according to claim 1, wherein the receiver is set to K.