Patent ID: 7843337
Filing Date: 2010-11-30
Classification: H04R

Abstract:
1. A hearing aid, comprising: a microphone configured to collect ambient sounds; an A/D converter configured to convert an analog signal outputted from the microphone into a digital signal; a hearing aid processor configured to perform hearing aid processing on the digital signal outputted from the A/D converter; a D/A converter configured to convert the signal that has undergone the hearing aid processing into an analog signal; a receiver configured to output the analog signal outputted from the D/A converter as an acoustic signal to the surroundings; an alert sound producer configured to produce an alert sound according to a specific condition; an alert sound shaper configured to shape the alert sound signal produced by the alert sound producer; a mixer that is provided between the hearing aid processor and the D/A converter, in which a first input is connected to the output of the hearing aid processor, a second input is connected to the output of the alert sound shaper, and its own output is connected to the input of the D/A converter; and a controller that produces a mix ratio signal used by the mixer to combine the output signals of the hearing aid processor and the alert sound shaper in a specific mix ratio, and that is connected to the mix ratio signal input terminal of the mixer, wherein the alert sound shaper has a table converter that outputs a gain table used in the hearing aid processing of the hearing aid processor after converting for alert sound signal use, an alert gain decider configured to decide an alert gain corresponding to an alert sound signal from the output signal of the table converter, and a multiplier that applies the alert gain outputted from the alert gain decider to the alert sound signal outputted from the alert sound producer.