FM audio signal receiver having a characteristic control function

Claim 2

An FM audio signal receiver comprising: receiving means for receiving an FM broadcast signal; received state analyzing means for analyzing a state of an FM broadcast signal received by the receiving means, said received state analyzing means detecting variation in output amplitude and input field strength of the received FM broadcast signal; analog-to-digital conversion means for analog-to-digital converting the FM broadcast signal received by the receiving means; digital signal processing means for changing a characteristic of the analog-to-digital converted signal; parameter table memory means for storing parameters for the digital signal processing means; and control means for reading out from the parameter table memory means a proper parameter for realizing improvement of a characteristic of the analog-to-digital converted signal in response to a result of analysis by the received state analyzing means and for controlling the digital signal processing means with the read out proper parameter, wherein said digital signal processing means performs, in response to detected values of the variation in the output amplitude and the input field strength of the received FM broadcast signal, multipath noise elimination processing for processing a multipath noise.

Claim 3

An FM audio signal receiver as defined in claim 1, wherein said parameter table memory means stores parameters for decreasing the output level of the received FM broadcast signal when the input field strength thereof is weak.

Claim 4

An FM audio signal receiver as defined in claim 2, wherein said digital signal processing means performs digital multiplication of the analog-to-digital converted signal in response to the read out proper parameter.

Claim 5

An FM audio signal receiver as defined in claim 1, wherein said parameter table memory means stores parameters for decreasing separation characteristic of the received FM broadcast signal when the input field strength thereof is weak.

Claim 6

An FM audio signal receiver as defined in claim 4, wherein said digital signal processing means performs digital addition of the analog-to-digital converted signal in response to the read out proper parameter.

Claim 7

An FM audio signal receiver as defined in claim 1, wherein said parameter table memory means stores parameters for attenuating a high frequency region of the received FM broadcast signal when the input field strength thereof is weak.

Claim 8

An FM audio signal receiver as defined in claim 6, wherein said digital signal processing means performs digital filtering of the analog-to-digital converted signal in response to the read out proper parameter.

Claim 9

An FM audio signal receiver as defined in claim 1, wherein said digital signal processing means performs a convolution operation in response to the read out proper parameter.

Claim 10

An FM audio signal receiver comprising: receiving means for receiving an FM broadcast signal; received state analyzing means for analyzing a state of an FM broadcast signal received by the receiving means, said received state analyzing means detecting variation in output amplitude and frequency deviation of the received FM broadcast signal; analog-to-digital conversion means for analog-to-digital converting the FM broadcast signal received by the receiving means; digital signal processing means for changing a characteristic of the analog-to-digital converted signal; parameter table memory means for storing parameters for the digital signal processing means; and control means for reading out from the parameter table memory means a proper parameter for realizing improvement of a characteristic of the analog-to-digital converted signal in response to a result of analysis by the received state analyzing means and for controlling the digital signal processing means with the read out proper parameter, wherein said digital signal processing means performs, in response to detected values of the variation in the output amplitude and frequency deviation of the received FM broadcast signal, multipath noise elimination processing for eliminating a multipath noise.

Claim 11

An FM audio signal receiver comprising: receiving means for receiving an FM broadcast signal; received state analyzing means for analyzing a state of an FM broadcast signal received by the receiving means, said received state analyzing means detecting variation in output amplitude and frequency deviation of the received FM broadcast signal; analog-to-digital conversion means for analog-to-digital converting the FM broadcast signal received by the receiving means; digital signal processing means for changing a characteristic of the analog-to-digital converted signal; parameter table memory means for storing parameters for the digital signal processing means; and control means for reading out from the parameter table memory means a proper parameter for realizing improvement of a characteristic of the analog-to-digital converted signal in response to a result of analysis by the received state analyzing means and for controlling the digital signal processing means with the read out proper parameter, wherein said digital signal processing means performs, in response to detected values of the variation in the output amplitude and frequency deviation of the received FM broadcast signal, multipath noise elimination processing for eliminating a multipath noise.

Claim 12

An FM audio signal receiver as defined in claim 9, wherein said received state analyzing means detects variation in input field strength of the received FM broadcast signal and said parameter table memory means stores parameters for decreasing the output level of the received FM broadcast signal when the input field strength thereof is weak.

Claim 13

An FM audio signal receiver as defined in claim 10, wherein said digital signal processing means performs digital multiplication of the analog-to-digital converted signal in response to the read out proper parameter.

Claim 14

An FM audio signal receiver as defined in claim 10, wherein said parameter table memory means stores parameters for decreasing separation characteristic of the received FM broadcast signal when the input field strength thereof is weak.

Claim 15

An FM audio signal receiver as defined in claim 12, wherein said digital signal processing means performs digital addition of the analog-to-digital converted signal in response to the read out proper parameter.

Claim 16

An FM audio signal receiver as defined in claim 10, wherein said parameter table memory means stores parameters for attenuating a high frequency region of the received FM broadcast signal when the input field strength thereof is weak.

Claim 17

An FM audio signal receiver as defined in claim 14, wherein said digital signal processing means performs digital filtering of the analog-to-digital converted signal in response to the read out proper parameter.

Claim 18

An FM audio signal receiver as defined in claim 9, wherein said digital signal processing means performs a convolution operation in response to the read out proper parameter.

Claim 19

An FM audio signal receiver comprising: receiving means for receiving an FM broadcast signal; received state analyzing means for analyzing a state of an FM broadcast signal received by the receiving means, said received state analyzing means detecting input field strength of the received FM broadcast signal and a pulse noise; analog-to-digital conversion means for analog-to-digital converting the FM broadcast signal received by the receiving means; digital signal processing means for changing a characteristic of the analog-to-digital converted signal and performing, in response to detected values of the input field strength and the pulse noise, noise elimination processing for eliminating the pulse noise; parameter table memory means for storing parameters for the digital signal processing means; and control means for reading out from the parameter table memory means a proper parameter for realizing improvement of a characteristic of the analog-to-digital converted signal in response to a result of analysis by the received state analyzing means and for controlling the digital signal processing means with the read out proper parameter, wherein said parameter table memory means stores parameters for decreasing an amount of correction of the noise elimination processing in accordance with input field strength of the received FM broadcast signal and with pulse width and amplitude of the pulse noise.

Claim 20

An FM audio signal receiver comprising: receiving means for receiving an FM broadcast signal; received state analyzing means for analyzing a state of an FM broadcast signal received by the receiving means, said received state analyzing means detecting input field strength of the received FM broadcast signal and a pulse noise; analog-to-digital conversion means for analog-to-digital converting the FM broadcast signal received by the receiving means; digital signal processing means for changing a characteristic of the analog-to-digital converted signal and performing, in response to detected values of the input field strength and the pulse noise, noise elimination processing for eliminating the pulse noise; parameter table memory means for storing parameters for the digital signal processing means; and control means for reading out from the parameter table memory means a proper parameter for realizing improvement of a characteristic of the analog-to-digital converted signal in response to a result of analysis by the received state analyzing means and for controlling the digital signal processing means with the read out proper parameter, wherein said parameter table memory means stores parameters for decreasing an amount of correction of the noise elimination processing in accordance with input field strength of the received FM broadcast signal and with pulse width and amplitude of the pulse noise.

Claim 21

An FM audio signal received as defined in claim 17, wherein said digital signal processing means performs a convolution operation in response to the read out proper parameter.

Claim 22

An FM audio signal receiver as defined in claim 17, wherein said received state analyzing means detects variation in output amplitude of the received FM broadcast signal and said digital signal processing means performs, in response to a detected value of the variation, multipath noise elimination processing for eliminating a multipath noise.

Claim 23

An FM audio signal receiver as defined in claim 19, wherein said parameter table memory means stores parameters for changing a characteristic of the received FM broadcast signal in accordance with variation in the output amplitude of the received FM broadcast signal.

Claim 24

An FM audio signal receiver as defined in claim 20, wherein said digital signal processing means performs a convolution operation in response to the read out proper parameter.